Will my car spool up lanuching?
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From: lakeland floirda
Will my car spool up lanuching? im building a ls2 mpt70 cammed firebird with a 3800 stall and a trans braked 350 turbo trans with a 9inch with 3.50 gears, and i hoping its going to launch hard. Well what i want to ask is when i get on the trans brake and bring it up to the stall will it build anyboost on the line? Im want this to be a monster out of the hole and i just got thinking that it may not spool up at all and actually be a pig till it starts rolling with a load on it? Will the stalled act as a load and make it build boost?
I just have no idea what its going to act like or run or anything
heres my build
99 v6 firebird
converted to a forged ls2
home ported 317 heads
comp cam 617 651 231 239 on a 144
ls6 intake
mpt 70 truck manifold turbo kit 10-12 psi of boost
mvr tial wastegate 44mm
tial bov
th350 trans brake
3800 tci
9 inch 3.50 gears posi
welds on a 26inch tail 11.50 m/t
fmic
fuel is twin walboros 8an line to a aeromotive fp regulator with 60lbs a hour injectors and 60 psi of fp
Lots of weight reduction, no ac,radio,interior no cage etc etc
I just have no idea what its going to act like or run or anything
heres my build
99 v6 firebird
converted to a forged ls2
home ported 317 heads
comp cam 617 651 231 239 on a 144
ls6 intake
mpt 70 truck manifold turbo kit 10-12 psi of boost
mvr tial wastegate 44mm
tial bov
th350 trans brake
3800 tci
9 inch 3.50 gears posi
welds on a 26inch tail 11.50 m/t
fmic
fuel is twin walboros 8an line to a aeromotive fp regulator with 60lbs a hour injectors and 60 psi of fp
Lots of weight reduction, no ac,radio,interior no cage etc etc
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From: lakeland floirda
hell ya, i was actually thinking very hard about that. its only like 200 bucks i think for that box. So cool, a 2 step set to 3800rpm's tied into my trans brake will make for a good lanuch. Awesome
With that engine, turbo, and stall, you'll probably be able to build boost off the foot brake...
I'd try it without the 2 step first, might not even need it. And if you do, it's only $2-300.
I'd try it without the 2 step first, might not even need it. And if you do, it's only $2-300.
will it spool? you have to be kidding
that turbo is WAY too small for that setup, if you cant build 20psi on the transbrake there would be major issues. hell i bet you can make 20psi on the footbrake with that stall. I would bet your engine starts rolling over at 5000rpm and dropping power fast
that turbo is WAY too small for that setup, if you cant build 20psi on the transbrake there would be major issues. hell i bet you can make 20psi on the footbrake with that stall. I would bet your engine starts rolling over at 5000rpm and dropping power fast
Same, that turbo is on the small side and should spool nicely without a 2 step
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A T70 should work ok, but is a bit small and power will drop off fast above 5500 rpms. Stall is probably too loose for a turbo but it's always best to try what you have first if it's already installed or you don't care about the labor.
Cam could cause you some issues with having .651 lift on the exhaust, especially with a small turbo like the T70. Your back pressure is going to be quite high which means you need very strong springs. Personally I like to stay under .600 lift on turbo cars unless they are race only and regular spring changes are expected.
A 28" tire might help with hooking up better.
Is this strictly a race car or will it see a lot of street time? I found 3.50's on a 26" tire to be intolerable on the street and could never get traction.
Cam could cause you some issues with having .651 lift on the exhaust, especially with a small turbo like the T70. Your back pressure is going to be quite high which means you need very strong springs. Personally I like to stay under .600 lift on turbo cars unless they are race only and regular spring changes are expected.
A 28" tire might help with hooking up better.
Is this strictly a race car or will it see a lot of street time? I found 3.50's on a 26" tire to be intolerable on the street and could never get traction.
Last edited by Zombie; Dec 30, 2010 at 11:40 AM.
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From: lakeland floirda
Whoo hoo thanks man, Maybe ill get a wheel up in the air! hehe
thanks dude ill do that
ya, i know your right. I need to save up for a bigger turbo once i get it rolling. But i got this brand new for 500 so ill see how it goes for now.
ok thanks man, i have a set of awesome prc dual springs. I think thats one thing thats done right. But ok so bigger then a 26 huh? the tires i have now are a little worn so i could go bigger soon. I was worried about the 3.50 gear being a tall for the setup so i got the 26's. Ill do some research now on what tires i can fit under it.
and it is kinda a 80% drag car. I just was building it to be faster then a group of friend i have at the local track
will it spool? you have to be kidding
that turbo is WAY too small for that setup, if you cant build 20psi on the transbrake there would be major issues. hell i bet you can make 20psi on the footbrake with that stall. I would bet your engine starts rolling over at 5000rpm and dropping power fast
that turbo is WAY too small for that setup, if you cant build 20psi on the transbrake there would be major issues. hell i bet you can make 20psi on the footbrake with that stall. I would bet your engine starts rolling over at 5000rpm and dropping power fast
A T70 should work ok, but is a bit small and power will drop off fast above 5500 rpms. Stall is probably too loose for a turbo but it's always best to try what you have first if it's already installed or you don't care about the labor.
Cam could cause you some issues with having .651 lift on the exhaust, especially with a small turbo like the T70. Your back pressure is going to be quite high which means you need very strong springs. Personally I like to stay under .600 lift on turbo cars unless they are race only and regular spring changes are expected.
A 28" tire might help with hooking up better.
Is this strictly a race car or will it see a lot of street time? I found 3.50's on a 26" tire to be intolerable on the street and could never get traction.
Cam could cause you some issues with having .651 lift on the exhaust, especially with a small turbo like the T70. Your back pressure is going to be quite high which means you need very strong springs. Personally I like to stay under .600 lift on turbo cars unless they are race only and regular spring changes are expected.
A 28" tire might help with hooking up better.
Is this strictly a race car or will it see a lot of street time? I found 3.50's on a 26" tire to be intolerable on the street and could never get traction.
and it is kinda a 80% drag car. I just was building it to be faster then a group of friend i have at the local track
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From: lakeland floirda
sweet thanks again ya'll. Guess ill see how it works out and start saving for a big kid turbo.
But again i knew it was gonna be small, but for the price it was nice. But i was just kidda worried about the car being a pig out of the hole.
But again i knew it was gonna be small, but for the price it was nice. But i was just kidda worried about the car being a pig out of the hole.
Last edited by BLINGOLE; Dec 30, 2010 at 12:39 PM.
How did it workout? I am starting a build with an LT1 using MPT70's and wondered how yours worked out?
I am planning 2 T70's with T4 .68 turbines on a 350. Mine should be the opposite of yours and be on the too LARGE side.
I am planning 2 T70's with T4 .68 turbines on a 350. Mine should be the opposite of yours and be on the too LARGE side.
Makes Sense..Ive got a 96 TA so I dont know how hard tuning a 2step would be on an LT1 car?
Transbrake and a 2 step would be OMG.
Click on my video links. It is an LT1 drag car with and without 2 step. It is an iron headed, big valve LT1. Race weight is I think 2800. Two steps are AMAZING! I still don't believe the difference it made especially since I am 2 step and FOOTBRAKE!
Transbrake and a 2 step would be OMG.
Transbrake and a 2 step would be OMG.
Do these work the same way on 6 speed cars? Do you rev to a set rpm and drop the clutch?
The 2 steps are as effective on a 6 speed from what I have read but my experience is on autos. As I understand it you hold the RPM point based on clutch where auto is based on brake but info is on site here.
