chevcamdan

When is comes to Turbocharging an LS1, at what point do you need to worry about forging the bottom end? I spoke to representatives at Squires Turbo Systems and they told me that a stock LT1 can handle 6 to 7 psi with their rear mounted turbo systems. The LS1 is all aluminum though so could it handle more than LT1?

Thanks

09CPTN

iTrader: (5)

If anything, i'd think the fact that the LS1's are aluminum would make them capable of handling LESS psi. Go with the STS reccomendation, 6-7 psi, you'll still make serious power and it'll be reliable. Speaking of forging though, what does it take to consider a motor forged? Can you just put in forged pistons and rods and say it's forged, or do you need an entire forged rotating assembly including the crankshaft? Sorry... .

FU_I_AM_UltraZ

iTrader: (20)

i know a few guys who bolted on a s/c to a bolt on LS1 car and haven't had any problems yet. the LS1 also is a 6 bolt main block... the LT1 is a 4 bolt.

GR33N GoblinM6

iTrader: (14)

it comes down to a few things in the engine.. I would say 1st would be the rod bolts in the engine.. the 98's had weaker rod bolts that later model LSx engines..

I would say I would only give it 5.5-6psi before I would replace the rod bolts in the car for more psi..

BeaversTA

F-body LT1 = 2 bolt
vett LT1 = 4 bolt

EPP

iTrader: (22)

We shoot for 8 psi in these engines. Bob

BlwnTA

iTrader: (18)

On LS Motors..

Decent Tune...8PSI=Safe

Perfect Tune...10PSI=Safe

After that your "rolling the dice" dependant on tune among other conditions.

jason02Z

iTrader: (10)

im running 12 with a safe tune i have less than 1000 miles on it and have beat on it a few times..together so far..

FU_I_AM_UltraZ

iTrader: (20)

point being an LT1 has 4 bolt mains and the LS1 has 6 bolts mains...

Pro Stock John

iTrader: (34)

Over the years I have seen folks run 8-10 lbs of boost all the time. 12-15 would be more tricky and one mistake could end up with a busted stock piston they are forgiving at the higher boost levels.

Urban Legend

iTrader: (5)

10 psi on a conservative tune for me. It has been close to 2 years with no issues on the stock bottom end.

Smearin

7.5psi here.. no problems... have about 3000 miles on it so far

JAvenger007

iTrader: (9)

since your looking at STS theyll likely recommend lowering your compression, which you should do before stepping up beyond 6psi. 5psi and a tune is fine on the stock motor. But consider adding a better fuel pump/injectors. Once you get into 7-9psi get some LQ9 heads. Theyll lower your CR down and a nice tune will be safe for 9psi. Search and youll see most guys recommend keeping the car under 550rwhp. But in the end its all in the tune. If you arent very familiar with these motors then i think 550 is a good stopping point until you get a fresh motor sitting in the garage.

To the poster about forging. You dont need to get a forged crank. The stocker will support 700+rwhp. Rods, pistons...yes, a forged setup will always be safer and longer lasting.

DocEwww

iTrader: (1)

Its really all in the tune....my buddy is running 15psi with a 92mm turbo but he can tune like no other. Of course its still a time bomb, but it should hold for a little while.

True, but revs kill the rod bolts, not power from what I've heard/read.

Its a loosely used term. I personally have forged everything but the crank and I consider my shortblock forged...mainly because our stock cranks are for the most part unbreakable.

EPP

iTrader: (22)

16 psi and 740 rwhp with this stock crank. http://www.exoticperformanceplus.com...Car.php?car=40 Bob

lmt0705

iTrader: (7)

from my personal experience, the pistons are the weak link in this motor. I was running just under 11 at 474hp on an eddy current dyno (525 dynojet). wound up cracking 2 pistons on the ring lands

Yousif Q8

10 psi with good tune
from 10psi to 16psi you will be need Pistons and ARB kit at least

Jon@BruteSpeed

iTrader: (3)

I run 9psi on a factory stock LT1.

Runn

Interesting info.

Blown2000SS

buddy of mine - 9psi making 503whp on a D1sc 7000 miles, no worries