mycar2fast

iTrader: (1)

hey all i just got my sts kit with the gt-67 upgrade, i have 36.5 injectors stock fuel pump, and will soon have a bar and plate fmic, was wondering whats the most boost i can throw at my motor with these mods safeley? and what will i have to do in order to make 10lbs of boost....
thanks in advance!
Blake

ChevyChad

iTrader: (50)

15 psi

vaticano

iTrader: (8)

depends on yout altitude. here colorado ive heard that a 10:1 motor can go 15#'s. but otherwise a stock ls1 can handle about 8#'s. if you want 10#'s get meth injection or switch over using e-85/ ethanol

ChevyChad

iTrader: (50)

maybe 30# if you add meth

Websy21

iTrader: (34)

I bet if you even go back a couple pages it would be there because it gets asked atleast once a week!

mycar2fast

iTrader: (1)

so if i upped my boost to eight it would b fine??? im in michigan so whats that tell you as far as altitude??

Ping King

iTrader: (20)

ive run 17 psi on a stock short block...its a crap shoot.

vaticano

iTrader: (8)

i'd say go for it. just dont add to much timing

wicked@boost

8-9 psi no problem with a good tune, + looks like u need more fuel injector and that fuel pump wont survive .

eLTwerker

same for an LT1?

FieroZ34

iTrader: (1)

I'd say go for about 45psi, and put a smaller throttle body on.

ChevyChad

iTrader: (50)

that is a good approach also. But you'd still need meth, or at least some nitrous to assist with the intake velocity factors...

FieroZ34

iTrader: (1)

It's a horrible approach, but that's my point. Another ignorant fool who thinks boost means everything.

Josh@MASPORT

iTrader: (3)

theres a sticky about making 8psi safely,

98turbls1

iTrader: (17)

I'd say that 8psi can be had with a FMIC and a good tune... You can put the 6.0 heads on with some good springs (patriot are always a good option) for a safer barrier.. Anything over please go with some meth and don't cheap out on it... The best meth kit (which you'll use after the engine build) is still way cheaper than pulling the engine for a forged swap... especially when you don't have the money for that...

ChevyChad

iTrader: (50)

geez, I know. I was just trying to give this guy a hard time because he made the same thread 19,562 other people have made. Okay, I guess I'm only amusing myself here...

Boodyrider

iTrader: (2)

But dude, if 45 psi and a smaller throttle body works so well, how come you're only in the 12s?


To original poster... um, you need to do a LOT of research. Safe boost means proper tuning, and wideband O2 /egt tuning on the dyno means a lot more than "8 psi with a wiener wagger" vs "10 psi with a wiener wagger AND crack"
Also keep in mind that if you're doing this on a street car, pump gas varies GREATLY in it's quality and purity, and you won't be tuning for the weather... so conservative is the key.

Short answer... with a GOOD front mount intercooler, and good tuning, 8psi should be safe, if tuned carefully and conservatively.


You wanna make big power... start with the short block, and build it for the style you'll run, IE low compression / high boost, nitrous, NA. The ideal motor for each approach differs.

ChevyChad

iTrader: (50)

I was in the 12 second club before I ever went FI. Haven't ever made a run with the procharger setup... All I've managed to do at the track with the procharger is break a driveshaft and a 10 bolt!

will82

7-8psi

or

10-12psi on meth

FieroZ34

iTrader: (1)

Everyone here who has answered with a pressure knows not what they speak.