BLINGOLE

iTrader: (5)

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

daws222000

iTrader: (6)

Get a MSD 2step and you will build plenty of boost. MSD is plug and play.

BLINGOLE

iTrader: (5)

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

LS1RedZ

iTrader: (19)

2 step + brake = hold the hell on

HydroStream6

iTrader: (16)

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.

Grr

iTrader: (2)

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

Fondle

iTrader: (4)

Same, that turbo is on the small side and should spool nicely without a 2 step

Fireball

iTrader: (21)

with that loose converter and small turbo it should spool rediculously fast...

Zombie

iTrader: (2)

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.

BLINGOLE

iTrader: (5)

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

BLINGOLE

iTrader: (5)

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.

Fondle

iTrader: (4)

It will be a beat out of the whole but you will max that turbo out early! I ran that same turbo on my stock motor v6 3.8l

My2kz28

iTrader: (1)

How do 2steps and 6 speeds work together? Im thinking about getting one to help me spool off the line...anyone use these on 6speeds?

TrikeMike

iTrader: (7)

Ignition retard 2 steps work great for 6 speeds. I run one on an '03 Cobra.

boosted LT1

iTrader: (3)

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.

98Z28CobraKiller

iTrader: (17)

2 steps are nice even if you don't need it to build boost as it gives you a set/tuneable launch point which makes tuning the suspension easier.

Boosted LT1, you have a PM.

My2kz28

iTrader: (1)

Makes Sense..Ive got a 96 TA so I dont know how hard tuning a 2step would be on an LT1 car?

boosted LT1

iTrader: (3)

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.

My2kz28

iTrader: (1)

haha looks like it surprised the crap out of you in the vid with the 2 step! I know how that goes..

Do these work the same way on 6 speed cars? Do you rev to a set rpm and drop the clutch?

boosted LT1

iTrader: (3)

Yes it more than surprised me. I thought it would help but never would believe of the difference rpm limiting at launch makes.

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.