831jd

iTrader: (3)

Im going to turbo my Lt1 soon and wanted to know what would be better. A MP70mm or a MP76mm turbo. Stock motor stock heads and cam. will be running meth and only looking for like 6 to 7 psi want to hit 400rwhp... will shift At 6000rpm. also have a 4000stall and 4.10 gears... but might go down to 3.73 for boost thanks..

boostedlt1

iTrader: (2)

front mount? mp70


if you're gonna do the work to change the gears go to 3.42's

831jd

iTrader: (3)

yea it will be a front mount.. Why do u say go with 3.42? Hold boost longer? thanks.

LSWHO

iTrader: (1)

Yup.

I'll trade ya my 3.42 rear for your 4.10.

boostedlt1

iTrader: (2)

exactly, most prefer the 3.42's just cause they're usually easy/cheap to come by, still adequately high, but also on the "lower" end of the spectrum

831jd

iTrader: (3)

SO a 70mm will work better for my set up... how fast you think i can go if i hook at full boost....

boostedlt1

iTrader: (2)

i was running a stock stall, therefore couldn't launch or use my two step so i was cutting 2.0 60's on mt et streets, then had to spool up (remote mount)

but at 7-8psi on an entirely stock 150k mile motor i ran 13.00 @ 114mph... trapped enough for high 11's but the launch kills me

i dyno'ed 400whp & 405ft/lbs and my car weighs 3900lbs

so i'm assuming with a 4k stall you'd have no problem running 11's

831jd

iTrader: (3)

yea i should have a 2 step too. and i have a lot of suspension work done and my wieght should be around 3300lbs.... thats what im shooting for is to run 11's

boostedlt1

iTrader: (2)

Yeah I have full suspension but with the stock stall launching at 1500rpms and cutting 2.0 60's none of it did anything.. lol

With your weight and stall I don't see 11's bring a problem at all

831jd

iTrader: (3)

lol yea... thanks for your help ill keep you posted with the build