Turbo on a budget: 91 Z28 rear mount build
09-02-2015, 12:41 PM
#101
Supreme Member
iTrader: (1)
Join Date: Jan 2002
Location: garage
Posts: 4,432
Likes: 0
Received 1 Like
on
1 Post
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Turbo on a budget: 91 Z28 rear mount build
Car looks good.
I haven't forgot about the AXXB bin. I have about 80% of it done. The remainder of work is mostly finishing the patch installer tool so that boost can be added to any $8D bin.
I haven't forgot about the AXXB bin. I have about 80% of it done. The remainder of work is mostly finishing the patch installer tool so that boost can be added to any $8D bin.
09-02-2015, 02:33 PM
#102
Re: Turbo on a budget: 91 Z28 rear mount build
That be awesome if you add a boost multiplier or boosted ve table to that code. It be simple plug and play.
Ordered the oil drain return line. Basically summit brand -8 twist tite hose. 40$ 15 ft.
Drain to scavenge pump is 5/8" rubber coolant line. See how well it holds up to oil.
Wastegate and last of the aluminu cold side pipe should be here tomorrow.
On schedule to get this near complete and ready to start tuning by end of weekend.
I do not have a wideband for this car but could maybe take the aem one out of my black car for temporary tuning. We'll see.
Ordered the oil drain return line. Basically summit brand -8 twist tite hose. 40$ 15 ft.
Drain to scavenge pump is 5/8" rubber coolant line. See how well it holds up to oil.
Wastegate and last of the aluminu cold side pipe should be here tomorrow.
On schedule to get this near complete and ready to start tuning by end of weekend.
I do not have a wideband for this car but could maybe take the aem one out of my black car for temporary tuning. We'll see.
09-02-2015, 07:26 PM
#103
Re: Turbo on a budget: 91 Z28 rear mount build
Started on wastegate tonight and finished it lol
Bought a cheap ebay wastegate. 38mm 10 psi spring. May cut this down to hopefully see 6-7 psi first. Then use my old boost controller to get more when needed
This was brand called wyntonm. It was 58$
Last edited by Orr89RocZ; 09-02-2015 at 07:31 PM.
09-04-2015, 06:38 AM
#107
Re: Turbo on a budget: 91 Z28 rear mount build
Cold side is fabricated. Looks pretty good. Need to paint the pipes black lol. May leave the aluminum straights as is. Need to make sure i have enough clamps for the couplers. Pick up some hairspray maybe for the pipe surfaces to keep them sticking in the coupler. I dont expect them to blow out tho.
Tonight i will try to get the 3 bar map installed, wire in the scavenge pump, and do the short exhaust "downpipe" i just need a 3" vband clamp to finish it. I may have one that had half the threaded stud broke off that i could weld a threaded rod on. Lol we shall see.
Tonight i will try to get the 3 bar map installed, wire in the scavenge pump, and do the short exhaust "downpipe" i just need a 3" vband clamp to finish it. I may have one that had half the threaded stud broke off that i could weld a threaded rod on. Lol we shall see.
09-05-2015, 07:00 PM
#108
Re: Turbo on a budget: 91 Z28 rear mount build
Oil pump. My summit hose didnt show up so i have heater hose in place at the moment
Finished build this weekend and was hoping to start driving. Base bin with code $59 was created and car ran. Today i lost an oring i guess in the rail on one injector so have major fuel leak. Need to tear tpi apart again and this time may cut posts down to get the injectors in further.
Need to tuck up cold side abit more. It sits lower than i planned around engine kmember. Overall i like how it turned out
Last edited by Orr89RocZ; 09-05-2015 at 07:08 PM.
09-06-2015, 09:07 PM
#110
Senior Member
Join Date: Jan 2008
Location: Massachusetts
Posts: 631
Likes: 0
Received 7 Likes
on
6 Posts
Car: 86' IROC
Engine: Supercharged 350
Transmission: T56
Axle/Gears: 3.45
Re: Turbo on a budget: 91 Z28 rear mount build
Im curious to see what your ground clearance will be on that charge pipe when its on the ground. Whats your total so far for the build?
09-07-2015, 12:08 AM
#111
Re: Turbo on a budget: 91 Z28 rear mount build
I got to add it all up. Small items as usual nickeled and dimed the budget. Ground clearance is great up until the front under kmember as it sits abit lower there than planned. Its driveable as is but i need to adjust it more
Had to redo injectors today due to oring breakage and leaks. Had to shave down tpi mounting posts afterall. Having all kinds of difficulty getting chips burned correctly and getting car to fire up and run. Its been reading pig rich but not responding to fuel changes
Had to redo injectors today due to oring breakage and leaks. Had to shave down tpi mounting posts afterall. Having all kinds of difficulty getting chips burned correctly and getting car to fire up and run. Its been reading pig rich but not responding to fuel changes
09-07-2015, 01:46 PM
#112
Re: Turbo on a budget: 91 Z28 rear mount build
Figured things out! Car is running on code $59 finally. Was in some sort of limp
Mode and not sure why but its alive now
Just hit 7 psi! Feels good but hard to say how quick it is lol so used to other cars brute power
Starts making boost at 2200 part throttle lol and thats unwrapped and still have cat converter on car. Saw 7psi on gate so its working. Afr is still alittle lean but my iats are high. Believe the heatsoak in the intake is the cause of it. Was 126 deg cruising and 137 after few sec pull on 7psi
Mode and not sure why but its alive now
Just hit 7 psi! Feels good but hard to say how quick it is lol so used to other cars brute power
Starts making boost at 2200 part throttle lol and thats unwrapped and still have cat converter on car. Saw 7psi on gate so its working. Afr is still alittle lean but my iats are high. Believe the heatsoak in the intake is the cause of it. Was 126 deg cruising and 137 after few sec pull on 7psi
Last edited by Orr89RocZ; 09-07-2015 at 02:32 PM.
09-07-2015, 03:07 PM
#115
Junior Member
Join Date: Feb 2013
Location: chambersburg͵ pa
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Iroc. 12.60@ 107. 1.72 60'
Engine: 350 paxton sn93 36lbs injectors
Transmission: 700r4
Axle/Gears: 9in. 390s
Re: Turbo on a budget: 91 Z28 rear mount build
thats great man. i hope everything comes together and it tunes alright, im really looking forward to this build and how well it tunes with the turbo back there, this would be a great way for me to get more boost since i dont have the ability to make headers and ditch the paxton sn93's 5-7 psi. hate to be a copy cat but i might just have to.
09-07-2015, 03:21 PM
#116
Re: Turbo on a budget: 91 Z28 rear mount build
This is the best setup for the money unless you dont have smog and ac stuff. Then you could relocate battery and do a front mount using stock manifolds and small piping.
Only thing that somewhat sucks is the cold side plumbing. I did quick and easy and it fits and has ok ground clearance but still hangs low around engine kmember. It also has no intercooler so should consider a meth kit or alternate location for the cold side to mount an air to air.
Pretty sure my iats are heat soak as hot rad air hits metal intake pipe and thats all it sees. So i may be ok. Gonna take it slow and remove some of my safety enrichment overtemp overboost stuff. Wait til night when it cools down some to test it. But over all the system flat out works and is simple to build. Bone stock ypipe cat and catback replacement pipes. Small diameter
I see 2 psi at 2000-2100 rpm part throttle so far lol its fun
Only thing that somewhat sucks is the cold side plumbing. I did quick and easy and it fits and has ok ground clearance but still hangs low around engine kmember. It also has no intercooler so should consider a meth kit or alternate location for the cold side to mount an air to air.
Pretty sure my iats are heat soak as hot rad air hits metal intake pipe and thats all it sees. So i may be ok. Gonna take it slow and remove some of my safety enrichment overtemp overboost stuff. Wait til night when it cools down some to test it. But over all the system flat out works and is simple to build. Bone stock ypipe cat and catback replacement pipes. Small diameter
I see 2 psi at 2000-2100 rpm part throttle so far lol its fun
09-08-2015, 07:38 AM
#119
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
SWEET!
...that oil is going to do nasty things to that coolant hose...
137deg doesn't seem too bad for IAT...
I like how you're progressing, I was always curious how a turbo would perform without an intercooler. Maybe you could throw us together a parts list?
Also, that code $59 your running refers to stuff found on code59.org?
...that oil is going to do nasty things to that coolant hose...
137deg doesn't seem too bad for IAT...
I like how you're progressing, I was always curious how a turbo would perform without an intercooler. Maybe you could throw us together a parts list?
Also, that code $59 your running refers to stuff found on code59.org?
09-08-2015, 07:46 AM
#120
Re: Turbo on a budget: 91 Z28 rear mount build
Working on list now. Coolant hose is temporary until my summit twist tight hyd hose arrives. It hasnt shown up and not sure why! Its been several days and its only coming from georgia. Oh well.
May do a 90 deg off turbo drain to get the hose away from the ground some but its not that low and shouldnt ever snag on anything.
Iat is heat soak i believe as pipe is metal and in between rad, getting 200 deg air from fans. I did a full second gear pull and few 100 rpm into third iat was 109 start and went to 134
May do a 90 deg off turbo drain to get the hose away from the ground some but its not that low and shouldnt ever snag on anything.
Iat is heat soak i believe as pipe is metal and in between rad, getting 200 deg air from fans. I did a full second gear pull and few 100 rpm into third iat was 109 start and went to 134
09-08-2015, 08:48 AM
#121
Re: Turbo on a budget: 91 Z28 rear mount build
Ok heres a basic list of parts and approximate costs for this build. Give a rough idea on major parts and some small things.
On3 turbo T70 .96 ar exhaust T4- i got 280 shipped normally 330$
Ebay wastegate sold by pair_dice, brand wyntonm. 38mm with all flanges and bolts 59$
Stock replacement I pipe by walker: 35$ i think. 2.25"
18" piece of tail pipe section from autozone 8$ 2.25" slip fit
45 deg crush bent 2.25" autozone 8$
18" or so 3" straight for "downpipe" 8$
Need a short section of 1.75" pipe for wastegate 5-10$
Weld bungs- 3/8 npt and 1/4 npt 10$
T4 flange 30$ shipped
Aluminum straights 2.5" 3ft and 4 ft section 50$
Coldside bends i used steel exhaust left overs. Need about 3 90's in 2.5, maybe a 1 ft straight 2.5" and 2 3" 90 bends. Should be enough for how i did it. $75
Vband clamp 3" 15$
Vband flange 7-10$
36-42 lb bosch 3 "white" injectors i got for 100$
Tpi gaskets. 30$ includes 1204 head side gasket since i took base off to clean andpaint
Diyautotune iat 22$
Diyautotune 3 bar 75$ with pigtail
Walbro 255 pump kit for my 4th gen tank 100$
Turbo drain and supply flanges with gaskets 30-40$
Misc fittings -4 for block oil supply, 3/8 npt to barb for scavenge pump 25$
Scavenge pump turbowerx exa i got used 300$ but they are 400 new. Their base model is 300 new and should also work fine. Theres not alot of oil.
Silicone couplers and tbolt clamps- 8-10 couplers and tb reducer 130$ or so
Oil supply line -4. 12-13' should do it. Braided hose i had left over from nitrous kit but would run you 60$. Twisttite hose works for 45$ or so.
Drain is -8 size, twist tite hose 50$ or so 20'. Need 13ft for pump to motor, and 3.5' for turbo drain to pump. I may run -10 size for drain tho as i have 5/8 coolant hose for now
Aem wideband o2 155$
Thats basically it for now
Up around 1700$ for this so far. All depends what you buy. Hose line and fittings can really add up. Cheap rubber line can work but may not last
On3 turbo T70 .96 ar exhaust T4- i got 280 shipped normally 330$
Ebay wastegate sold by pair_dice, brand wyntonm. 38mm with all flanges and bolts 59$
Stock replacement I pipe by walker: 35$ i think. 2.25"
18" piece of tail pipe section from autozone 8$ 2.25" slip fit
45 deg crush bent 2.25" autozone 8$
18" or so 3" straight for "downpipe" 8$
Need a short section of 1.75" pipe for wastegate 5-10$
Weld bungs- 3/8 npt and 1/4 npt 10$
T4 flange 30$ shipped
Aluminum straights 2.5" 3ft and 4 ft section 50$
Coldside bends i used steel exhaust left overs. Need about 3 90's in 2.5, maybe a 1 ft straight 2.5" and 2 3" 90 bends. Should be enough for how i did it. $75
Vband clamp 3" 15$
Vband flange 7-10$
36-42 lb bosch 3 "white" injectors i got for 100$
Tpi gaskets. 30$ includes 1204 head side gasket since i took base off to clean andpaint
Diyautotune iat 22$
Diyautotune 3 bar 75$ with pigtail
Walbro 255 pump kit for my 4th gen tank 100$
Turbo drain and supply flanges with gaskets 30-40$
Misc fittings -4 for block oil supply, 3/8 npt to barb for scavenge pump 25$
Scavenge pump turbowerx exa i got used 300$ but they are 400 new. Their base model is 300 new and should also work fine. Theres not alot of oil.
Silicone couplers and tbolt clamps- 8-10 couplers and tb reducer 130$ or so
Oil supply line -4. 12-13' should do it. Braided hose i had left over from nitrous kit but would run you 60$. Twisttite hose works for 45$ or so.
Drain is -8 size, twist tite hose 50$ or so 20'. Need 13ft for pump to motor, and 3.5' for turbo drain to pump. I may run -10 size for drain tho as i have 5/8 coolant hose for now
Aem wideband o2 155$
Thats basically it for now
Up around 1700$ for this so far. All depends what you buy. Hose line and fittings can really add up. Cheap rubber line can work but may not last
09-08-2015, 10:46 AM
#122
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
Thanks!
Ah, so you do have a WB02's. Did you use them to learn the VE table or did you use a premade $59 .bin? How did $59 run with the original O2 sensors? Sorry, I'm new to this stuff.
Ah, so you do have a WB02's. Did you use them to learn the VE table or did you use a premade $59 .bin? How did $59 run with the original O2 sensors? Sorry, I'm new to this stuff.
09-08-2015, 11:55 AM
#123
Re: Turbo on a budget: 91 Z28 rear mount build
I stole the wideband off my black car as temporary to dial in afr. Its not wired to ecm and does not give data to any auto ve calcs. It certainly can but does not now
What i did was take my old twin turbo bin and set it up using the stock 305 tpi 8d code ve tables. I manually inserted the values where possible. Like 8D AXXB ve table, 1600 rpm 50 kpa i took that value and plugged into code $59 3 bar ve table at 1600 51 kpa. Did that for all points to 101 kpa. Then just manually scaled up the boosted ve sections 110-300 kpa to establish a curve
Timing table same thing basically. Some of the start up tables i reused from previous motor but leaned it out some since its smaller motor.
Got it to fire and it ran good as is. Time to do minor adjustments in ve cells for optimal air fuel but it runs clean enough
What i did was take my old twin turbo bin and set it up using the stock 305 tpi 8d code ve tables. I manually inserted the values where possible. Like 8D AXXB ve table, 1600 rpm 50 kpa i took that value and plugged into code $59 3 bar ve table at 1600 51 kpa. Did that for all points to 101 kpa. Then just manually scaled up the boosted ve sections 110-300 kpa to establish a curve
Timing table same thing basically. Some of the start up tables i reused from previous motor but leaned it out some since its smaller motor.
Got it to fire and it ran good as is. Time to do minor adjustments in ve cells for optimal air fuel but it runs clean enough
09-08-2015, 12:37 PM
#124
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
I don't mean to sidetrack the thread, but just let me interject a thought as a turbo n00b:
How more difficult do you think it would it be to have dual turbos, in series? 1 smaller one to help a larger one to spool up quicker? Possible or not possible? Worth it?
How more difficult do you think it would it be to have dual turbos, in series? 1 smaller one to help a larger one to spool up quicker? Possible or not possible? Worth it?
09-08-2015, 12:51 PM
#125
Re: Turbo on a budget: 91 Z28 rear mount build
Thats compounding turbos. Usually for high boost on smaller motors to get spool. Often seen on diesels. Not needed for v8's and waste of effort unless you just want to be different for showing it off or something
09-08-2015, 01:03 PM
#126
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
I was thinking it may also do something positive in cooling the intake temps? But all the oil/cold air routing could be a serious problem?
09-08-2015, 01:30 PM
#128
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
But you've got filtered cold air coming into both turbos, surely that's got to lower temps... Anyway I don't want to derail your progress with my theories. Going back to lurking...
09-08-2015, 02:12 PM
#130
Junior Member
Join Date: Feb 2013
Location: chambersburg͵ pa
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Iroc. 12.60@ 107. 1.72 60'
Engine: 350 paxton sn93 36lbs injectors
Transmission: 700r4
Axle/Gears: 9in. 390s
Re: Turbo on a budget: 91 Z28 rear mount build
Check into coolingmist.com for meth injection, they have a kit i use that utilizes factory washer fluid tank. its a real nice kit for the price. high volume pump,boost pressure switch thats fully adjustable. pump runs with key on then once at set pressure it opens a selonoid, uses different size injectors for how much you want to spray.
i wonder how fast the turbo would spool with 3in exhaust before turbo? i seen on on3's website the t-76 was priced reasonably too. just be my luck my motor wouldnt spool it up quick enough.
i wonder how fast the turbo would spool with 3in exhaust before turbo? i seen on on3's website the t-76 was priced reasonably too. just be my luck my motor wouldnt spool it up quick enough.
09-08-2015, 10:05 PM
#132
Re: Turbo on a budget: 91 Z28 rear mount build
Hit 9 psi tonight. Got my old turboxs manual controller on. Holding 9 psi, tune is fat at 11.5-11.7 ish and timing is good at 23-24 deg. Car pulls strong. 70-100 mph only takes about 5 sec or so. Doesnt seem to shabby since it took 1 sec to see peak boost and downshift from 3rd to 2nd.
69% duty cycle at 4700 rpm at 11.6-11.7 afr i believe. So far so good
Iat was 119 start which is average cruise temp it seems after heat soaking abit. Then after 70-100 mph pull it was 148. I hope it stays under 165 during a 1/4 run or i will be in trouble lol
69% duty cycle at 4700 rpm at 11.6-11.7 afr i believe. So far so good
Iat was 119 start which is average cruise temp it seems after heat soaking abit. Then after 70-100 mph pull it was 148. I hope it stays under 165 during a 1/4 run or i will be in trouble lol
09-09-2015, 09:15 AM
#133
Supreme Member
iTrader: (1)
Join Date: Jan 2002
Location: garage
Posts: 4,432
Likes: 0
Received 1 Like
on
1 Post
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Turbo on a budget: 91 Z28 rear mount build
Nice job getting it done so quick. I have the AXXB bin ready. I will do some testing tonight. The only problem is that I don't run 3 bar gm sensors so I will config it (numbers in CAL - xdf section) for 2 bar. Once I have it tested I will config it for 3 bar.
It isn't too late to ebay a $40 shurflo pump and mcmaster $10 5 or 10 gph nozzle!
Running the .96 A/R turbine? That is where I would have started.
At 9 PSI no-IC, no-spray........I predict 13.1 sec ET.
oh, that 305 tpi doesn't mind that much timing surprises me.
It isn't too late to ebay a $40 shurflo pump and mcmaster $10 5 or 10 gph nozzle!
Running the .96 A/R turbine? That is where I would have started.
At 9 PSI no-IC, no-spray........I predict 13.1 sec ET.
oh, that 305 tpi doesn't mind that much timing surprises me.
09-09-2015, 09:31 AM
#134
Re: Turbo on a budget: 91 Z28 rear mount build
Lol i dont mess around. I get my head set to do something i do it but this setup was extremely easy for me to set up. Yup its an .96 ar p trim and has no issue spooling. After 20 min drive and few hits that exhaust is very hot! Lol and its not even wrapped yet
I am doing just over 1 deg per psi. I had found 34 deg seems to feel best at wot before so i left that in. Then it runs down about to 23 deg at 9 psi. Seems safe to me. Not getting activity on the knock sensors. We shall see. You'd crap your pants if you knew how much timing my 401 car runs at 25 psi on 93 gas
I have a snow meth pump and twin nozzles of unknown sizes. I have never used it but going to try to get it installed next two days if it works and run friday night
I did a 70-100 pull in about 4 seconds considering the downshift time. It seems as fast as my old ls1 car which was mid 12's but hard to say. I know this car wont 60 ft as well with no stall
I am doing just over 1 deg per psi. I had found 34 deg seems to feel best at wot before so i left that in. Then it runs down about to 23 deg at 9 psi. Seems safe to me. Not getting activity on the knock sensors. We shall see. You'd crap your pants if you knew how much timing my 401 car runs at 25 psi on 93 gas
I have a snow meth pump and twin nozzles of unknown sizes. I have never used it but going to try to get it installed next two days if it works and run friday night
I did a 70-100 pull in about 4 seconds considering the downshift time. It seems as fast as my old ls1 car which was mid 12's but hard to say. I know this car wont 60 ft as well with no stall
09-09-2015, 10:03 AM
#137
Supreme Member
iTrader: (1)
Join Date: Apr 2008
Location: Utah
Posts: 10,401
Likes: 0
Received 2 Likes
on
2 Posts
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: Turbo on a budget: 91 Z28 rear mount build
wish i was still out there , im heading out now to the shop but being in the middle of hay crop it only leaves me about 2-3 hours a day to work on the car
hell even when not in the middle of crop i dont get much time to work on it one of the reasons its taking so damn long to finish , that and if id stop changing things on it lol
hell even when not in the middle of crop i dont get much time to work on it one of the reasons its taking so damn long to finish , that and if id stop changing things on it lol
09-09-2015, 11:15 AM
#138
Supreme Member
iTrader: (1)
Join Date: Jan 2002
Location: garage
Posts: 4,432
Likes: 0
Received 1 Like
on
1 Post
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Turbo on a budget: 91 Z28 rear mount build
Hook up the line from nozzle to pump and pump water for 1 minute into a measured container. Then you can figure out GPH. That is how I test setups when I do the PWM and pressure changes. Works well.
09-09-2015, 11:29 AM
#139
Re: Turbo on a budget: 91 Z28 rear mount build
Stopped at the house over lunch break. One nozzle thread is severely stripped. Other is partially dinged so i may just order a nozzle from summit today. If it ships from ohio it will be here tomorrow.
Pump seems to work still so just need a bulkhead for the wiper bottle and reuse some of my -4 lines i have from previous nitrous crap and oil feeds. So should easily hook this up
Pump seems to work still so just need a bulkhead for the wiper bottle and reuse some of my -4 lines i have from previous nitrous crap and oil feeds. So should easily hook this up
09-09-2015, 04:01 PM
#140
Re: Turbo on a budget: 91 Z28 rear mount build
Ebay wastegate sold by pair_dice, brand wyntonm. 38mm with all flanges and bolts 59$
Where is your IAT mounted? Do you have the DIY autotune (v6 camaro) open cage one installed? I'm really shocked how much my IAT's went up going from mounted in an air box to a aluminum sheet metal throttle body elbow, I was expecting 10-15* (lot of air flow, open cage sensor, mounted in thin sheetmetal very close to where it should be ambient temp), it went somewhere between 30-40* under similar conditions.
09-09-2015, 04:19 PM
#141
Re: Turbo on a budget: 91 Z28 rear mount build
The iat is the diyauto version. Its mounted right in front of the throttlebody. That charge pipe however is mild steel and snakes between pulleys and rad so its getting 200 deg air blowing on it from rad. I believe thats my main issue with heat soak but cant deny boosted air is still hot
Cruise temp seems to reach 120 iat. So if i move this piping over rad somehow like in a tpi plastic box intake does, it should go down some. My black car has same iat and same location in mild steel but never sees this temp unless car idles for awhile in the heat.
I read some decent reviews on these wastegates. Main concern is cheaper steel and valve melting in high heat i guess. But i dont see near the egt a front mount high boost setup will. So it should be golden. And i was impressed with the quality except they gave me 1 bolt that was way undersized for the wastegate flange. Not sure what happened there. But 58$ for gate and flanges gaskets and hardware?! I'll try it
Cruise temp seems to reach 120 iat. So if i move this piping over rad somehow like in a tpi plastic box intake does, it should go down some. My black car has same iat and same location in mild steel but never sees this temp unless car idles for awhile in the heat.
I read some decent reviews on these wastegates. Main concern is cheaper steel and valve melting in high heat i guess. But i dont see near the egt a front mount high boost setup will. So it should be golden. And i was impressed with the quality except they gave me 1 bolt that was way undersized for the wastegate flange. Not sure what happened there. But 58$ for gate and flanges gaskets and hardware?! I'll try it
09-09-2015, 08:17 PM
#142
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
Can you do an offset for your IAT temps? I guess that requires one to know how IAT affects other curves?
09-10-2015, 09:41 PM
#144
Re: Turbo on a budget: 91 Z28 rear mount build
Meth should be in tomorrow and going to the track!
Small 375 ml per min or 6 gph
Any guess!?
Trying to make a baseline 9 psi pass and the work my way to 14 if i get enough time
Street tire likely but may throw the 19" radial on if i get time
Small 375 ml per min or 6 gph
Any guess!?
Trying to make a baseline 9 psi pass and the work my way to 14 if i get enough time
Street tire likely but may throw the 19" radial on if i get time
09-10-2015, 11:57 PM
#145
Senior Member
Join Date: May 2010
Location: Alamogordo, NM
Posts: 848
Likes: 0
Received 0 Likes
on
0 Posts
Car: '86 Grand National
Engine: LZ9????
Transmission: 2004R
Axle/Gears: 3.42
Re: Turbo on a budget: 91 Z28 rear mount build
I'm going to guess....12.40 @ 111mph
09-11-2015, 09:14 AM
#146
Junior Member
Join Date: Feb 2013
Location: chambersburg͵ pa
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 Iroc. 12.60@ 107. 1.72 60'
Engine: 350 paxton sn93 36lbs injectors
Transmission: 700r4
Axle/Gears: 9in. 390s
09-13-2015, 01:06 PM
#147
Re: Turbo on a budget: 91 Z28 rear mount build
I had all kinds of issues lol. Added meth kit last minute and went to track untuned. Noticed it was alot richer than expected. Never got fuel dialed in.
It only trapped 98 on 9 psi setting. But looked at logs it made 4 psi thru 1st, 6-7 psi by second and just peaked at 9 at top third.
I was kinda surprised to see it that low til i got home and checked timing. Base was -5 or so. Must have slipped when i did gaskets and injectors and before i toghtened down the nut lol. Also have severe arcing problem at the distributor. I touched it and shocked my hand bad. So gotta look at the cap and wires.
So i fixed timing issue as best i could in bin file so far and feels alot better now that 10 or so deg arent missing. But not sure its as fast as i'd expect yet. Dialing in air fuel now. Rich at redline. Other than that, work out the bugs it should wake up
It only trapped 98 on 9 psi setting. But looked at logs it made 4 psi thru 1st, 6-7 psi by second and just peaked at 9 at top third.
I was kinda surprised to see it that low til i got home and checked timing. Base was -5 or so. Must have slipped when i did gaskets and injectors and before i toghtened down the nut lol. Also have severe arcing problem at the distributor. I touched it and shocked my hand bad. So gotta look at the cap and wires.
So i fixed timing issue as best i could in bin file so far and feels alot better now that 10 or so deg arent missing. But not sure its as fast as i'd expect yet. Dialing in air fuel now. Rich at redline. Other than that, work out the bugs it should wake up
09-13-2015, 01:27 PM
#148
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
Just a friendly observation from someone familiar with troubleshooting electronics/auto systems: You're experimenting with 2 HUGE variables at the same time and this could make your learning curve alot steeper. I'm sure you know this already, but I admire your honesty and willingness to tackle anyway...
1 variable is the new water/meth injection.
The other variable is that rear mounted turbo and the bin.
Shouldn't you nail down that .bin for the turbo without alky first?
1 variable is the new water/meth injection.
The other variable is that rear mounted turbo and the bin.
Shouldn't you nail down that .bin for the turbo without alky first?
09-13-2015, 01:33 PM
#149
Re: Turbo on a budget: 91 Z28 rear mount build
Bin without alky was already ok air fuel wise before meth kit. Problem is iat gets too hot for my taste without alky for over 10 psi boost values and a full 1/4 mile
It only takes me 2-3 pulls to dial air fuel in with this setup. Its already real close now that i have been working on it today and friday night after track.
It only takes me 2-3 pulls to dial air fuel in with this setup. Its already real close now that i have been working on it today and friday night after track.
09-13-2015, 01:39 PM
#150
Senior Member
Re: Turbo on a budget: 91 Z28 rear mount build
That's right, sorry I forgot you already dialed in the .bin...
How are the IAT's with alky injection? Any change?
How are the IAT's with alky injection? Any change?