89 Iroc - 355,twin gt35's,megasquirt
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
apparently my neighbors dont appreciate the sound of open headers like i do lmao
got a visit from the local sheriff after i fired up the car and moved it,at least he was cool, lol he did say when he sees me driving it on the road he is going to pull me over so he can take the car for a spin lmao
im happy though this is the first time the car has moved under its own power since the day i got it , even if it was without the turbos and just the open turbo headers


got a visit from the local sheriff after i fired up the car and moved it,at least he was cool, lol he did say when he sees me driving it on the road he is going to pull me over so he can take the car for a spin lmao
im happy though this is the first time the car has moved under its own power since the day i got it , even if it was without the turbos and just the open turbo headers


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From: Kemah, Tx
Car: 1991 z28
Engine: Turbo 310
Transmission: T56
Axle/Gears: D44
Joined: Jul 2003
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Originally Posted by project89
im happy though this is the first time the car has moved under its own power since the day i got it , even if it was without the turbos and just the open turbo headers...
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
i would have but i only ran the car long enough to pull it into the street and back it back into the driveway so i can start welding up the parachute mount since my welder wouldnt reach with the car facing in.
i still dont have a thermostat housing so there is no coolant in the car im afriad to run it any longer then a min at a time
i still dont have a thermostat housing so there is no coolant in the car im afriad to run it any longer then a min at a time
Joined: Jul 2003
Posts: 10,537
Likes: 205
From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Originally Posted by project89
i would have but i only ran the car long enough to pull it into the street and back it back into the driveway so i can start welding up the parachute mount since my welder wouldnt reach with the car facing in.
i still dont have a thermostat housing so there is no coolant in the car im afriad to run it any longer then a min at a time....
i still dont have a thermostat housing so there is no coolant in the car im afriad to run it any longer then a min at a time....
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From: DC Metro Area
Car: 87TA 87Form 71Mach1 93FleetWB 04Cum
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Joined: Apr 2008
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
i ended up paying 171.84 for it but thats still a kickass price.
the only reason i payed more is the supplier he had that had it for 165 had the aem on backorder, one of his other suppliers had it instock and ready to ship so instead of waiting i paid the extra 6 bucks
it will be here tommorow via fedex so i can finally start on final reassembly of this thing and start driving it
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
rob i can get the thermo housing from napa for 20 bucks lol it owuld prolly cost that much just to have u ship one.
deff want that heater box and a shifter if u still have them i just gota wait, im on payed vacation right now so my paycheck is going to suck without overtime,not going to have a decent check till the end of this month or middle of nextmonth again
deff want that heater box and a shifter if u still have them i just gota wait, im on payed vacation right now so my paycheck is going to suck without overtime,not going to have a decent check till the end of this month or middle of nextmonth again
Joined: Jul 2003
Posts: 10,537
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Dave, I was going to throw in the thermostat housing with the ac delete box because it wouldn't effect shipping in any way, it is essentially weightless. Whatever you wanna do though bro. Listen, do you remember of any credible wheel shops around central Jersey that correct curb rash?
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
Dave, I was going to throw in the thermostat housing with the ac delete box because it wouldn't effect shipping in any way, it is essentially weightless. Whatever you wanna do though bro. Listen, do you remember of any credible wheel shops around central Jersey that correct curb rash?
think it was something like wheel doctor or wheel wizards
it going to be a lil bit before i have the extra cash fo rthat heater box so ill just pick up the thermo housing from napa for now i quess
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
got the coldside pretty much done today






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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
my aem wideband showed up today,also taked to the ex shop and they cant fit me in till mid next week to finish up my ex system
rob pm me a price for that stuff with shipping to 84713 ill see what i can swing on payday which is next tuesday
rob pm me a price for that stuff with shipping to 84713 ill see what i can swing on payday which is next tuesday
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
just picked up the last few odds and ends to finish the car if i dont run out of daylight maybe ill be able to get a video up tonight
Joined: Jul 2003
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Originally Posted by Street Lethal
Get it done brother, wanna hear this beast roar.... 

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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
its damn close, would have had it done today but friends came over and we hit the gun range for a few hours today,lol had to play with my new ar-15
pretty much just have to wire in some toggle switches for ignition, fuel pump and my fans, and them set the base timing on the motor and shell be ready to roll
pretty much just have to wire in some toggle switches for ignition, fuel pump and my fans, and them set the base timing on the motor and shell be ready to roll
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
ok so i started on my gauge/switch panel
the aluminum housing is the bottom of a stock ecm case, this will bolt up under the center heater/ac vents
figuring out the gauge location and switch locations

drilling the holes for the oil presure and volt gauge

and them installed with the aem and boost gauge location layed out


need to run out and buy a 2 inch holesaw to get those holes drilled
and down the left side from top to bottom will be my switches for
#1 ignition
#2 fuel Pump
#3 nitrous arm
#4 antilag momentary push button switch
i left room between switches 1&2 and 2&3 incase i need to add anything later
the aluminum housing is the bottom of a stock ecm case, this will bolt up under the center heater/ac vents
figuring out the gauge location and switch locations

drilling the holes for the oil presure and volt gauge

and them installed with the aem and boost gauge location layed out


need to run out and buy a 2 inch holesaw to get those holes drilled
and down the left side from top to bottom will be my switches for
#1 ignition
#2 fuel Pump
#3 nitrous arm
#4 antilag momentary push button switch
i left room between switches 1&2 and 2&3 incase i need to add anything later
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
well the car caught fire today :bang: >
luckily its not bad and was contained to the dash area few burnt up wires out of the fusebox, some melted fuses and a couple burnt up wires.
the previous owner put 30 amp fuses in everything, not to mention the rats nest of wires in behind the radio out of which 4 were direct to the main power feed without fuses of anykind.
im so pissed off right now im about ready to sell the car
luckily its not bad and was contained to the dash area few burnt up wires out of the fusebox, some melted fuses and a couple burnt up wires.the previous owner put 30 amp fuses in everything, not to mention the rats nest of wires in behind the radio out of which 4 were direct to the main power feed without fuses of anykind.
im so pissed off right now im about ready to sell the car
Joined: Jul 2003
Posts: 10,537
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Ahh bro that sucks. Give it some time to think about, don't jump to selling it just yet...
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From: Alamogordo, NM
Car: '86 Grand National
Engine: LZ9????
Transmission: 2004R
Axle/Gears: 3.42
Re: 89 Iroc - 355,twin gt35's,megasquirt
well the car caught fire today :bang: >
luckily its not bad and was contained to the dash area few burnt up wires out of the fusebox, some melted fuses and a couple burnt up wires.
the previous owner put 30 amp fuses in everything, not to mention the rats nest of wires in behind the radio out of which 4 were direct to the main power feed without fuses of anykind.
im so pissed off right now im about ready to sell the car
luckily its not bad and was contained to the dash area few burnt up wires out of the fusebox, some melted fuses and a couple burnt up wires.the previous owner put 30 amp fuses in everything, not to mention the rats nest of wires in behind the radio out of which 4 were direct to the main power feed without fuses of anykind.
im so pissed off right now im about ready to sell the car
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
my blazer had the same problem, had to take off the dash and rewire a few circuits. some idiot kid hacked up the radio harness and the direct short melted a few other wires next to it. it sucked lol. but you have a better car with way more potential, and its a turbocharged v8 as compared to my little 3.4 lol. and you dont want to know how much $$$ i sunk into that, and might be puttin down 170hp. i think you should stick with it

ive got it almost all fixed, car has a few ground issues i need to take care of as well.
there is 2 wires im not sure were the previous owner has them runing just yet, one is taped into the main power feed and is connected to a brown or tan wire with a white stripe that runs twards the back of the car on the ds. its prolly for the hatch release or lights . need to fix that.
and a heavy gauge wire that looks like it runs up to the gauge cluster, if i rember right when i tore the car apart that wire was run out the firewall threw a hole he drilled and either hooked to the alternator indicator terminal or it was to a 12 volt +. for now i cut off the bare end and taped over it ill figure that one out later.
as of right now i need to buy 2 relays,
#1 for power to dizzy and the coil
#2 is for the secondary radiator fan though im tempted to wire both fans to one relay
stuff i still need to get otherwise would be a few toggle switches for the nitrous stuff and a pushbutton for the antilag system, but i dont need those for the car to run
btw can anyone tell me what gauge wire should be used on the 12v hot wire to the coil, think i have some 10 gauge wire for that now
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From: Alamogordo, NM
Car: '86 Grand National
Engine: LZ9????
Transmission: 2004R
Axle/Gears: 3.42
Re: 89 Iroc - 355,twin gt35's,megasquirt
i used a single 30A relay to power my olds aurora dual fans on my ram with success for the last year now.
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
i also foudn out what the tan wire with white strip was, the previous owner hotwired the fuel pump to come on with the key. im going to rewire it back threw the relay with a low oil presure switch to kill the fuel pump if oil presure drops.
scratch that id hate to lose fuel under boost so i will wire the oil presure switch to the relay i have hooked up for the coil
ive decided to ditch the iac control in favor of letting my megasquirt control nitrous instead.so instead of just using my megasquirt to just turn on and off a wet shot of nitrous, ill now use it to turn on a dry shot which i can progressivly control, and also progressivly control the extra fuel added.
ill be hitting this thing with 2 stages 25 shot off the line and then an additional 75 shot to kick this thing in the *** at about half track
unfortunatly my coil wires got burned up in the lil mishap and i cant get new ones locally so till i can drive 60 miles out to the junkyard i cut down some fuse blades to fit in the coil connector slots and ill solder wires to them to make the connections for now
and now some pics
as u can see i still need to put the harness back in the loom in places.
also need to get a new 90* 1/8th inch pipe adapter to replace the one i striped out on the passenger side turbo
the downpipes that are pointed up are temp they are just there till i can drive over to the ex shop and have them connect the turbos to my y pipe
also need to fix the angle on my oil drain for the driver side turbo, its on 2 steep of an angle and the way i have to fit the hose on it the oil will backup in the hose on the ds turbo
anyways picssssssssss






almost time to take it all back apart and make it look good
almost forgot need to get the correct throttle cable for it to, i was able to get the one on the car hooked up but its deff not the right one
Last edited by project89; Sep 26, 2011 at 06:50 PM.
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
this nitrous wiring diagram is kicking my ***

im about to just wire it up as a regular 2 stage wet system instead of a 2 stage dry system and not use the ms to control it
i get the input circut, but the output circut is a lil confusing
im also going to be adding in a knock sensor to use so im glad i kept my esc module. i didnt relize how easy it was to add knock sensor to ms2 vs ms1, my ms1 on the v6 car was a royal pain in the *** to do while the ms2 is so friggen easy to add it


i am running out of room on in the proto area on my board though with all the extras im adding, so i may go get a bread board and external case and move the extra stuff to an external case

im about to just wire it up as a regular 2 stage wet system instead of a 2 stage dry system and not use the ms to control it
i get the input circut, but the output circut is a lil confusing
im also going to be adding in a knock sensor to use so im glad i kept my esc module. i didnt relize how easy it was to add knock sensor to ms2 vs ms1, my ms1 on the v6 car was a royal pain in the *** to do while the ms2 is so friggen easy to add it
i am running out of room on in the proto area on my board though with all the extras im adding, so i may go get a bread board and external case and move the extra stuff to an external case
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From: garage
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: 89 Iroc - 355,twin gt35's,megasquirt
The strange relay symbols are probably confusing things for you. The relay coil being drawn as a green blob with the dashed line through it is odd.
PWM control to a relay isn't the best way to control the N2O soleniods, but I have been doing that with my water/alky pump and surprisingly the relay has lasted for a while.
PWM control to a relay isn't the best way to control the N2O soleniods, but I have been doing that with my water/alky pump and surprisingly the relay has lasted for a while.
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
The strange relay symbols are probably confusing things for you. The relay coil being drawn as a green blob with the dashed line through it is odd.
PWM control to a relay isn't the best way to control the N2O soleniods, but I have been doing that with my water/alky pump and surprisingly the relay has lasted for a while.
PWM control to a relay isn't the best way to control the N2O soleniods, but I have been doing that with my water/alky pump and surprisingly the relay has lasted for a while.
im going to time the first stage .250 of a second after i release the launchcontrol/antil lag switch,and then ill set a time delay for the additional 75 shot to come in right after the 2-3 shift for a total 100 hp shot down track. im hoping with the nitorus to put down 4 digit rwhp numbers. hp goal for this build is 1,001 hp and or an 8.99 et
i should be able to do it turbo355 did mid 800's with really crappy heads and smaller turbos and went 9.37 or a lil bit faster then that
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
well im not sure if my map sensor is dead or not im only reading 80kpa with engine off, seems a lil low even for 5500ft above sea level. i was expecting more around 90kpa.
anyone got a barometer chart that shows readings vs altitude?
anyone got a barometer chart that shows readings vs altitude?
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
nm i found a decent one and it says 84kpa at 5,000 ft @ 44*f so its right, damn now i know why my daily driver feels like it has no ***** lmao
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
just finished up my final parts list for tuesday
3 x toggle switches
2x relays
1x 90* 2.5 inch coupler
1x 4-3 reducing coupler
1x package of 90* spark plug boots
8 accell shorty spark plugs
coil connector and power pigtail form the jy
and 4 3inch u bends to run the dual 3 inch downpipes
2 bullet mufflers
so once i pick up this stuff on tuesday the car will be finished
ive decided to run my own 3inch dual ex system instead of having the ex shop coonect the 2.5 inch downpipes to the 2.5 to 3 inch y pipe with the 3 inch flowmaster catback
3 x toggle switches
2x relays
1x 90* 2.5 inch coupler
1x 4-3 reducing coupler
1x package of 90* spark plug boots
8 accell shorty spark plugs
coil connector and power pigtail form the jy
and 4 3inch u bends to run the dual 3 inch downpipes
2 bullet mufflers
so once i pick up this stuff on tuesday the car will be finished
ive decided to run my own 3inch dual ex system instead of having the ex shop coonect the 2.5 inch downpipes to the 2.5 to 3 inch y pipe with the 3 inch flowmaster catback
Joined: Jun 2001
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From: DC Metro Area
Car: 87TA 87Form 71Mach1 93FleetWB 04Cum
Re: 89 Iroc - 355,twin gt35's,megasquirt
As long as you keep the diode (I think a small capacitor works also) across the relay to keep the arcing down it works well, without it the relay will melt closed quickly. I used a PWM progressive controller on the N2O setup on my 4th gen and without it I melted the relay in a matter of a few runs (luckly it was my fuel relay so I didn't kill anything but it I couldn't figure out what happened/why the car wouldn't run and had to get it towed home). NX used to (I don't know if they still do) supply 2 40A relays in their kits that had a diode inside to protect them that work really well for this kind of thing.
Joined: Jun 2001
Posts: 8,028
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From: DC Metro Area
Car: 87TA 87Form 71Mach1 93FleetWB 04Cum
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
lol well we all know that cars are never done
the build is stage 1 and that final parts list completes the build stage
well besides the stuff i need to build my parachute mount that needs to be done before bodywork and paint
stage 2 is body work and a custom paint job (will hapen over winter)
stage 3 will be upgrades ( will start in the spring time)
the build is stage 1 and that final parts list completes the build stage
well besides the stuff i need to build my parachute mount that needs to be done before bodywork and paint
stage 2 is body work and a custom paint job (will hapen over winter)
stage 3 will be upgrades ( will start in the spring time)
Joined: Jul 2003
Posts: 10,537
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Originally Posted by project89
lol well we all know that cars are never done
the build is stage 1 and that final parts list completes the build stage
well besides the stuff i need to build my parachute mount that needs to be done before bodywork and paint
stage 2 is body work and a custom paint job (will hapen over winter)
stage 3 will be upgrades ( will start in the spring time)
the build is stage 1 and that final parts list completes the build stage
well besides the stuff i need to build my parachute mount that needs to be done before bodywork and paint
stage 2 is body work and a custom paint job (will hapen over winter)
stage 3 will be upgrades ( will start in the spring time)
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
its should have ran yesterday i tried for an hour to get the motor to fire.
looks liek i had an incorect setting in the tune causing the ms unit to ignore the ignition signal from the vr sensor. it just stoped raining though its cold as **** outside still.
but im about to head back out fix the setti ngs and try again
looks liek i had an incorect setting in the tune causing the ms unit to ignore the ignition signal from the vr sensor. it just stoped raining though its cold as **** outside still.
but im about to head back out fix the setti ngs and try again
Joined: Jul 2003
Posts: 10,537
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From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Haha, this is why I keep scratching my head when you start talking about the parachute assembly cuz the engine didn't even fire yet lol. Not knocking the Megasquirt, but I'm glad I'm going EBL-P4 instead. Get it going Dave, and ask your girl to video it for us if she could. Headed to the track in a few minutes myself, good luck with it today bro, and hopefully when I get back we see an idle vid...
Thread Starter
Supreme Member
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Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
Haha, this is why I keep scratching my head when you start talking about the parachute assembly cuz the engine didn't even fire yet lol. Not knocking the Megasquirt, but I'm glad I'm going EBL-P4 instead. Get it going Dave, and ask your girl to video it for us if she could. Headed to the track in a few minutes myself, good luck with it today bro, and hopefully when I get back we see an idle vid... 

- Ignition Input Capture to 'Falling Edge'
- Cranking Trigger to 'Trigger Rise'
- Coil Charging Scheme to 'Standard Coil Charging'
- Spark Output to 'Going High (Inverted)'
- Ignition Input Capture to 'Rising Edge'
- Cranking Trigger to 'Trigger Rise'
- Coil Charging Scheme to 'Standard Coil Charging'
- Spark Output to 'Going High (Inverted)'
the way i originally had it the ecu was totally ignoring the tach signal, havent had a chance to correct it though it started raining again, im hoping it stops within the next hour or 2 so i can go try again
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Joined: Jul 1999
Posts: 1,773
Likes: 7
From: Panama City FL
Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: 89 Iroc - 355,twin gt35's,megasquirt
wasnt the ms's fault i had this backwards in my tune file
- Ignition Input Capture to 'Falling Edge'
- Cranking Trigger to 'Trigger Rise'
- Coil Charging Scheme to 'Standard Coil Charging'
- Spark Output to 'Going High (Inverted)'
- Ignition Input Capture to 'Rising Edge'
- Cranking Trigger to 'Trigger Rise'
- Coil Charging Scheme to 'Standard Coil Charging'
- Spark Output to 'Going High (Inverted)'
I remember these settings giving me a helluva time as well. I originally went by the megasquirt info but whichever way worked for me was opposite of the online manual.
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
its very important that u not the settings for the way u setup ur ms unit
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
it friggen snowed overnight, i went outside this morning to find 2 inches of snow, im hoping it warms up enpough to melt it all today so i can get this beast fired up
Joined: Jul 2003
Posts: 10,537
Likes: 205
From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Originally Posted by project89
it friggen snowed overnight...
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iTrader: (1)
Joined: Jan 2002
Posts: 4,432
Likes: 1
From: garage
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: 89 Iroc - 355,twin gt35's,megasquirt
Put the studded snows on the rear. Boosted engines love the cold weather. Now is the perfect time of year for making HP.
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
i got more snow this morning, in a few more days its supposed to go back to the mid 80's
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt

Junior Member
Joined: Sep 2011
Posts: 93
Likes: 0
From: abq nm
Car: 1988 TransAm
Engine: sbc 9:8:1 cr 40os slugs rhs heads
Transmission: th400 3800stall b&mkit manual vb
Axle/Gears: stock
Re: 89 Iroc - 355,twin gt35's,megasquirt
Hey sicrs can u tell me how to post pics or upload them so i spread the love for third gens
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
build completed, this has now moved onto stage 2 of my project, body work and some wild custom paint
https://www.thirdgen.org/forums/body...ml#post5071174
https://www.thirdgen.org/forums/body...ml#post5071174
Joined: Jul 2003
Posts: 10,537
Likes: 205
From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: 89 Iroc - 355,twin gt35's,megasquirt
Originally Posted by project89
build completed, this has now moved onto stage 2 of my project, body work and some wild custom paint...
Thread Starter
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: 89 Iroc - 355,twin gt35's,megasquirt
it wasnt supposed to goto paint for another 2 months, body shop called and told me they can get the car in on the first, so its a race now to get all the body prep and work dont in time so i can get the car over there to be sprayed








