401 twin turbo new track best
09-26-2015, 02:51 PM
#55
Member
Join Date: Dec 2007
Location: Minnesota
Posts: 475
Likes: 0
Received 2 Likes
on
2 Posts
Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: 401 twin turbo new track best
Wow that is crazy. I guess that Dart SHP block holds a little more power than they rate it at, huh? Justin, I'm curious about your ignition timing with your setup. Care to explain what your timing curve looks like? I'm especially curious how much advance it'll tolerate at that boost level. Thanks.
09-26-2015, 03:48 PM
#56
Re: 401 twin turbo new track best
Lol with the ls1 pcm the timing table runs based on an air flow calculation. It runs to 1.2 g/cyl. This particular motor maxes that table out at 3-4 psi 4000ish rpm.
So there really isnt a curve so to speak. On 28-29 psi boost its sitting at 25 deg timing on vp110 gas. Not sure if it wants more yet or not. Havent gotten to test that yet. Car didnt quite run as hard as i thought for the boost value last night. So may be "blowing spark out" but hard to tell. Felt like it was alittle unsmooth but log didnt look to terrible. It went 165.7 in hot air at 1 psi less boost. Last night was better air but only a 1 mph gain. So not sure what happened
My buddy tried turning his car up and more boost slowed down a good bit. Log looked similar to mine. He thinks its spark issues and got new coil packs. Firecore. Holley hp system so hes gonna try that out. If it improves i may look into that or mess with dwell settings to see if i cant get this thing going 170+. I was hoping to see 168 last night on same boost as 8.51 pass. It picked up a tiny bit but may still need to tweak tune. Hot air would have made car run richer. Cool air leaned it out some so may not like that as much
So there really isnt a curve so to speak. On 28-29 psi boost its sitting at 25 deg timing on vp110 gas. Not sure if it wants more yet or not. Havent gotten to test that yet. Car didnt quite run as hard as i thought for the boost value last night. So may be "blowing spark out" but hard to tell. Felt like it was alittle unsmooth but log didnt look to terrible. It went 165.7 in hot air at 1 psi less boost. Last night was better air but only a 1 mph gain. So not sure what happened
My buddy tried turning his car up and more boost slowed down a good bit. Log looked similar to mine. He thinks its spark issues and got new coil packs. Firecore. Holley hp system so hes gonna try that out. If it improves i may look into that or mess with dwell settings to see if i cant get this thing going 170+. I was hoping to see 168 last night on same boost as 8.51 pass. It picked up a tiny bit but may still need to tweak tune. Hot air would have made car run richer. Cool air leaned it out some so may not like that as much
09-26-2015, 06:45 PM
#57
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: 401 twin turbo new track best
nice job , should me some much lower times in it as the nice fall air starts moving in
2 things id like to point out and suggest
#1 plz put a chute on that thing , u may not need it to stop but if u ever get that thing sideways it could save ur and the cars ***
#2 and this one isnt easy to do , try to never sit on the line against a slower car letting them get out on ya , ive seen way to man bad things happen when a faster car sits on the line and runs into the back of a slower car when one of them goes into the other lane
2 things id like to point out and suggest
#1 plz put a chute on that thing , u may not need it to stop but if u ever get that thing sideways it could save ur and the cars ***
#2 and this one isnt easy to do , try to never sit on the line against a slower car letting them get out on ya , ive seen way to man bad things happen when a faster car sits on the line and runs into the back of a slower car when one of them goes into the other lane
09-26-2015, 07:18 PM
#58
Re: 401 twin turbo new track best
nice job , should me some much lower times in it as the nice fall air starts moving in
2 things id like to point out and suggest
#1 plz put a chute on that thing , u may not need it to stop but if u ever get that thing sideways it could save ur and the cars ***
#2 and this one isnt easy to do , try to never sit on the line against a slower car letting them get out on ya , ive seen way to man bad things happen when a faster car sits on the line and runs into the back of a slower car when one of them goes into the other lane
2 things id like to point out and suggest
#1 plz put a chute on that thing , u may not need it to stop but if u ever get that thing sideways it could save ur and the cars ***
#2 and this one isnt easy to do , try to never sit on the line against a slower car letting them get out on ya , ive seen way to man bad things happen when a faster car sits on the line and runs into the back of a slower car when one of them goes into the other lane
2) this was my buddys lightning. If it hooks and runs right it should be a mid 10's truck. We were racing and told me to give him 2 seconds and thats what i did before i moved.
Normally i move out first as you say, dont wanna see them get squirrly and cross lanes
09-27-2015, 01:12 PM
#59
Re: 401 twin turbo new track best
I was looking at your build and I have a question.
So you started off with that 383? Sold the short block, kept the heads, ect?
You got a shp block with a stout rotating assembly...
What shp? bore/stroke?
1 or 2 piece rms?
So you started off with that 383? Sold the short block, kept the heads, ect?
You got a shp block with a stout rotating assembly...
What shp? bore/stroke?
1 or 2 piece rms?
09-27-2015, 01:15 PM
#60
Re: 401 twin turbo new track best
Plan was to keep my old 383 shortblock and just swap heads but i was limited on boost with that block. I knew i wanted more so i sold everything except the heads and valvetrain for most part and got the shp
400 bore 350 main 2pc. Callies rotating assembly.
400 bore 350 main 2pc. Callies rotating assembly.
09-27-2015, 03:18 PM
#63
Re: 401 twin turbo new track best
So Dart, shp blocks are way way under rated then. Ive been doing a bunch of searching and, well I'm sure your well aware of what dart rates them at, But I've seen/read builds of them all over the place from 500, to, well yours. I did see one that posted 1200hp w/nos I believe. Crazy.
Your stroke is 3.75 right?
Your stroke is 3.75 right?
09-27-2015, 08:07 PM
#66
Re: 401 twin turbo new track best
So Dart, shp blocks are way way under rated then. Ive been doing a bunch of searching and, well I'm sure your well aware of what dart rates them at, But I've seen/read builds of them all over the place from 500, to, well yours. I did see one that posted 1200hp w/nos I believe. Crazy.
Your stroke is 3.75 right?
Your stroke is 3.75 right?
Look at the 7 sec camaro build. Charlie has same block and makes 100-200 hp more than me. Runs 170 mph so far. They are underrated for turbos. I wouldnt use it for heavy nitrous. May be the shp pro block but thats it
09-28-2015, 07:18 PM
#70
Member
Join Date: Dec 2007
Location: Minnesota
Posts: 475
Likes: 0
Received 2 Likes
on
2 Posts
Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: 401 twin turbo new track best
Lol with the ls1 pcm the timing table runs based on an air flow calculation. It runs to 1.2 g/cyl. This particular motor maxes that table out at 3-4 psi 4000ish rpm.
So there really isnt a curve so to speak. On 28-29 psi boost its sitting at 25 deg timing on vp110 gas. Not sure if it wants more yet or not. Havent gotten to test that yet. Car didnt quite run as hard as i thought for the boost value last night. So may be "blowing spark out" but hard to tell. Felt like it was alittle unsmooth but log didnt look to terrible. It went 165.7 in hot air at 1 psi less boost. Last night was better air but only a 1 mph gain. So not sure what happened
My buddy tried turning his car up and more boost slowed down a good bit. Log looked similar to mine. He thinks its spark issues and got new coil packs. Firecore. Holley hp system so hes gonna try that out. If it improves i may look into that or mess with dwell settings to see if i cant get this thing going 170+. I was hoping to see 168 last night on same boost as 8.51 pass. It picked up a tiny bit but may still need to tweak tune. Hot air would have made car run richer. Cool air leaned it out some so may not like that as much
So there really isnt a curve so to speak. On 28-29 psi boost its sitting at 25 deg timing on vp110 gas. Not sure if it wants more yet or not. Havent gotten to test that yet. Car didnt quite run as hard as i thought for the boost value last night. So may be "blowing spark out" but hard to tell. Felt like it was alittle unsmooth but log didnt look to terrible. It went 165.7 in hot air at 1 psi less boost. Last night was better air but only a 1 mph gain. So not sure what happened
My buddy tried turning his car up and more boost slowed down a good bit. Log looked similar to mine. He thinks its spark issues and got new coil packs. Firecore. Holley hp system so hes gonna try that out. If it improves i may look into that or mess with dwell settings to see if i cant get this thing going 170+. I was hoping to see 168 last night on same boost as 8.51 pass. It picked up a tiny bit but may still need to tweak tune. Hot air would have made car run richer. Cool air leaned it out some so may not like that as much
Sorry for all the questions but I'm intrigued by all of this!
I believe you are running LS coils, right? I haven't heard much about spark issues with those under boost. My brother and a friend are running them at around the 800whp level with no issues but I'd imagine the spark energy required to spark the gap goes up exponentially with cylinder pressure. What are your plugs gapped at? For what it's worth on my boosted Honda when it had trouble sparking it was very obvious. It'd go from perfect to very rough in as little as 1-2 psi difference. Seems you hit a certain threshold and it gets bad quickly.
Eagerly waiting for more updates!
09-28-2015, 07:29 PM
#71
Re: 401 twin turbo new track best
All combos are different. I was surprised this setup requires this much timing. I'm still trying to see what it wants the most. Dyno had fuel pressure issues so not sure if thats why it didnt seem to respond a whole lot between 23-25 at peak hp but did make alittle more trq. But basically timing was slowly added in til it stopped making power. It has knock sensor and it seems happy so far.
Plugs look ok. But never checked them after a pass. Just when i got home next day. May not mean much at that point.
Plug gap is .018 now. Been .025 last few times out and seemed to run great. I was thinkin it needed to be tighter cuz my friends setup is having issues. He runs holley hp now tho, and cant adjust dwell the same as hptuners i guess. He got firecore coils now. Hope to see how they run next week. I plan to go out too. Back boost down to 26-27 and see what mph i can get there with fuel and timing, and see if spark doesnt blow out. Hard to say if it is or not. Dont feel much but that last run didnt feel super clean. My friend says he turned up boost and ran fine but trapped several mph less! So he thinks spark
Plugs look ok. But never checked them after a pass. Just when i got home next day. May not mean much at that point.
Plug gap is .018 now. Been .025 last few times out and seemed to run great. I was thinkin it needed to be tighter cuz my friends setup is having issues. He runs holley hp now tho, and cant adjust dwell the same as hptuners i guess. He got firecore coils now. Hope to see how they run next week. I plan to go out too. Back boost down to 26-27 and see what mph i can get there with fuel and timing, and see if spark doesnt blow out. Hard to say if it is or not. Dont feel much but that last run didnt feel super clean. My friend says he turned up boost and ran fine but trapped several mph less! So he thinks spark
09-28-2015, 09:38 PM
#72
Re: 401 twin turbo new track best
dont know if it could be an issue on your car, but we had a discussion the other night about a friends car. it wont pick up any after a certain boost level. like if he bumped it up from 20psi to 25psi the trap speed remained the same.
pretty sure its his valvesprings. they are still too weak, and the valves are floating with all the pressure on the backside of the fairly large valves in his heads.
pretty sure its his valvesprings. they are still too weak, and the valves are floating with all the pressure on the backside of the fairly large valves in his heads.
09-28-2015, 09:44 PM
#73
Re: 401 twin turbo new track best
I dont think its float. I had that before. This car doesnt seem to do it but i will def keep an eye on all that as well.
I picked up but didnt pick up as much as i expected. Next couple outings i will play with things more and see what i find
I picked up but didnt pick up as much as i expected. Next couple outings i will play with things more and see what i find
10-05-2015, 08:50 AM
#74
Re: 401 twin turbo new track best
Welp one more thing for the car. Now need to save for the pack, they are expensive
Fabbed up using some 095 wall 1 3/4 cross tube and some 1.5" .083 wall stub outs. 1/8" 6x6 plate and 1/8" gusset under the stubouts.
Slip fit tube 1.5" into the 1 3/4. I messed up and went .095 wall 1.75 and thats 1.56" id on a 1.5 tube so i welded beads to make up the difference. Should have used .120 wall
Fabbed up using some 095 wall 1 3/4 cross tube and some 1.5" .083 wall stub outs. 1/8" 6x6 plate and 1/8" gusset under the stubouts.
Slip fit tube 1.5" into the 1 3/4. I messed up and went .095 wall 1.75 and thats 1.56" id on a 1.5 tube so i welded beads to make up the difference. Should have used .120 wall
Last edited by Orr89RocZ; 10-05-2015 at 08:56 AM.
10-05-2015, 03:17 PM
#75
Senior Member
iTrader: (4)
Join Date: Apr 2002
Location: Midland, GA
Posts: 568
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91' Z28, 92' Z28
Engine: 383, L98 stock
Transmission: Built 700R4, Stock 700R4
Axle/Gears: 12 Bolt 3.73, 10 Bolt 3.23
Re: 401 twin turbo new track best
Yeah, it's about that time because that street car is fast man!! Better safe than sorry, my cage is coming soon.
10-09-2015, 10:38 AM
#76
Re: 401 twin turbo new track best
New best 60'. 1.29'. May even have been on back tire i cant tell
200 rpm more on launch but right before 1/8 lost the charge pipe coupler again. I need to do a better job sealing that one lol moved the t bolt clamp over and snugged it down better next pass but spun to a 8.58
Tune changes i had made a tiny fuel adjustment in mid range rpm but also added 1 ms of spark dwell. It seemed to help. Third felt stronger and pulled smoother. Problem was things were pig rich. My guess is spark is lighting off entire mixture now and no longer missing slightly which showed leaner. Fuel change shouldnt have made that much difference at this magnitude. 1 point richer.
So hope to dial back fuel and start to see more mph
200 rpm more on launch but right before 1/8 lost the charge pipe coupler again. I need to do a better job sealing that one lol moved the t bolt clamp over and snugged it down better next pass but spun to a 8.58
Tune changes i had made a tiny fuel adjustment in mid range rpm but also added 1 ms of spark dwell. It seemed to help. Third felt stronger and pulled smoother. Problem was things were pig rich. My guess is spark is lighting off entire mixture now and no longer missing slightly which showed leaner. Fuel change shouldnt have made that much difference at this magnitude. 1 point richer.
So hope to dial back fuel and start to see more mph
10-11-2015, 04:57 PM
#78
Re: 401 twin turbo new track best
What motor setup and ignition system?
Mine didnt change much from .024" gap to .018". My friends also didnt change when goin down even tighter to .016
Mine however greatly smoothed out when i increased dwell in the tune
Heres the 1.29 60 and u see the puff when charge coupler separated
Mine didnt change much from .024" gap to .018". My friends also didnt change when goin down even tighter to .016
Mine however greatly smoothed out when i increased dwell in the tune
Heres the 1.29 60 and u see the puff when charge coupler separated
10-11-2015, 04:59 PM
#79
Re: 401 twin turbo new track best
Heres the 8.58 with spin but i recovered with quick pedal game lol
ran similar to my 8.51 on same tune however this was a full point richer now from dwell change lighting off the charge now. Have back the fuel down some. Rpm log was much smoother
ran similar to my 8.51 on same tune however this was a full point richer now from dwell change lighting off the charge now. Have back the fuel down some. Rpm log was much smoother
10-12-2015, 06:42 AM
#84
Re: 401 twin turbo new track best
Thanks! Lol combo has been relatively same since 2012 motor wise, its just taken this long to really turn it up and work bugs out. I had a lot of problems. I changed intercooler systems and turbos but for the most part its same setup. Amazing how well it responds to more and more boost lol
How has your car been? Havent seen alot of updates lol
How has your car been? Havent seen alot of updates lol
10-14-2015, 02:00 PM
#85
Re: 401 twin turbo new track best
I have pretty much reached the goals I wanted with my car. The California smog laws but a limit on things. I do have a 1965 Buick Skylark with a LS3 based 427 that I play with and don't have to worry about any smog rules.
10-15-2015, 12:52 PM
#86
Supreme Member
Re: 401 twin turbo new track best
Truly an inspiration Justin, as soon as I'm done with the break in period on mine I can try to do the same. Probably wont get anywhere near those times though
10-24-2015, 11:43 PM
#87
Senior Member
Join Date: Dec 2003
Location: SE PA, USA
Posts: 829
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Camaro IROC-Z
Engine: Intercooled Twin Turbo LQ4
Transmission: Tremec TKO 600
Re: 401 twin turbo new track best
My thoughts exactly. Great job on the car, I enjoyed watching the videos and I like the track announcers reactions! I agree, the big wheels on front make it looks like it shouldn't be that fast!
10-25-2015, 12:46 AM
#88
Junior Member
Join Date: Jul 2015
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1984 camaro sport coupe
Engine: 305
Transmission: 700r4
Re: 401 twin turbo new track best
So i cant figure out how to start a new feed and you guys seem to know what you are doing. Im having a problem with my throttle position sensor and transmission. So i bought a 1984 camaro sport coupe with a carbureted 305 and a 700r4 tranny or 4l60e if you will with overdrive. The car run fine and shift perfect. I wanted more power without putting a new engine in and wanted to see what i could do with a slow 305. With the engine still in the car i put a new cam,lifters,rods,springs,rockers,intake manifold,carburetor, HEI distributor,wires, plugs, timing chain and gears. And then transmission i drained the fluid put a new filter in checked for shavings to be sure and had none everything looked good. Anyways so it had a electric rochester quad jet on it with a built in tps in the carb. I pulled that junk off and put a edelbrock 600cfm with a electric choke not the best but better then what i had. Then pulled the stock distributor without HEI and put a HEI one on. got the car running tv cable hooked up nice and tight took it out for a drive and noticed that it goes into park, nutural, revers, OD and 1 low. BUT here is where i get lost my speedometor stopped working and When it is in OD it will not shift out of 1st gear and if i try to shift myself still nothing wont shift out of first and sometime acts like its in nutural. The only code showing is the TPS code. I dont know whats going on but it should be shifting but its not i know 700r4s are non electric so they say but im also told they are. I have a 305 in so putting a powerglide,th350 or th400 wouldnt be worth it to me unless engine swap thanks for the help if any.
10-25-2015, 09:00 PM
#89
Re: 401 twin turbo new track best
Good air today and good track prep lol car liked it and worked tune in abit more
Then this
Last pass i was on a tear but charge pipe popped off. 1.28 60 ft new best 5.32 at 135.79 in 1/8. Coasted 8.26 156 1/4. Was up almost .9 mph by 1000 ft
Then this
Last pass i was on a tear but charge pipe popped off. 1.28 60 ft new best 5.32 at 135.79 in 1/8. Coasted 8.26 156 1/4. Was up almost .9 mph by 1000 ft
Last edited by Orr89RocZ; 10-25-2015 at 09:10 PM.
10-25-2015, 09:40 PM
#90
Supreme Member
iTrader: (8)
Join Date: Oct 2001
Location: Il
Posts: 11,696
Received 747 Likes
on
506 Posts
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 401 twin turbo new track best
Dang, makes me moist..
10-26-2015, 08:24 AM
#91
Re: 401 twin turbo new track best
Good air today and good track prep lol car liked it and worked tune in abit more
Twin Turbo Camaro goes 8.29 at 167 mph at Pittsburgh Raceway Park - YouTube
Then this
Last pass i was on a tear but charge pipe popped off. 1.28 60 ft new best 5.32 at 135.79 in 1/8. Coasted 8.26 156 1/4. Was up almost .9 mph by 1000 ft
Twin Turbo Camaro goes 8.29 at 167 mph at Pittsburgh Raceway Park - YouTube
Then this
Last pass i was on a tear but charge pipe popped off. 1.28 60 ft new best 5.32 at 135.79 in 1/8. Coasted 8.26 156 1/4. Was up almost .9 mph by 1000 ft
10-26-2015, 10:08 AM
#94
TGO Supporter/Moderator
iTrader: (12)
Join Date: Jul 1999
Location: SALEM, NH
Posts: 11,724
Likes: 0
Received 89 Likes
on
75 Posts
Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: 401 twin turbo new track best
wtf..
-- Joe
-- Joe
