500@10psi

iTrader: (5)

how much boost can a stock internals lq4 handle? ..... safely. I dont want to add a meth kit and the car is gonna be mostly street driven so i want to run on 94 oct. or less. what kind of psi #s have you guys used the cr. is 9.5:1 Thanks in advance for any info

extremetoy

iTrader: (17)

it could prob handle 500hp at 10 psi or so

500@10psi

iTrader: (5)

hmm good one......... that was on an ls1 that i blew up hence why i went with the lower comp. and bigger ci of the lq4. i was planning on going forged internals next winter but i dont want to screw this motor up in the mean time seriously it shouldnt be too hard of a question ..........

dreamls1

iTrader: (25)

i know i guy that went 14psi 590whp on a stock ls6.

500@10psi

iTrader: (5)

really almost a bar on that kind of comp? that makes me feel alot better. has he had any issues with it?

JJ_TURBO

iTrader: (12)

I was running 10psi and dyno 515rwhp but when I went to 14psi it did run well for sometime until it burned a pistons.

Badass94z

I just finished my LQ4 mustang project and it made 640whp on 14psi through a big stalled auto 80mm Turbo on a stock lq4 other then 02 zo6 cam and springs

500@10psi

iTrader: (5)

which motor was that on (assuming ls1) thanks for the info btw

Gordon0652

iTrader: (4)

Rods can take about 500-550rwhp. I wouldn't push more than that. If it was my car i would only do about 500rwhp at a max boost of 7-8#s.
EDIT: which ever comes first.

extremetoy

iTrader: (17)

i was also being serious at the same time.... im sure you could get more than that but it sounds like you want to keep it somewhat safe as well. realistically i think the 500 will come before the 10 psi (depending on the drivetrain)

500@10psi

iTrader: (5)

thx man your right about trying to stay safe after i blew the last one the car was down for 2 years before i grew the kahonies to put a new motor in myself i just couldnt justify the 5k price tag the mechanic quoted me and that was for a ls1 motor with unknown mileage

WS6HUMMER

iTrader: (19)

What kind of fuel? I have been curious if you could do 10 on pump gas.

Silver_TransAm

iTrader: (2)

I usually run 10psi as well and even up to 14psi on 93octane fuel no meth. I do have 317 heads though.

My buddy has higher comp heads and is going to run 8psi on his aps kit. Its all in the tune.

SPLATT

iTrader: (1)

silver, any numbers yet?

LS1Silverado05

iTrader: (41)

Hope your thread lasts longer than mine...

ItsNotStock

iTrader: (24)

Buddy of mine has a turbo on his Silverado SS. Stock he had it as 12psi until one of his pistons gave up (#8 go figure). They think it was due to a bad tune. He now has it rebuilt to stock specs with slightly lower compression 9.5:1 and it running 10 psi I believe.

Silver_TransAm

iTrader: (2)

Have a dyno/retune apt on wed. I think my injectors will cut the runs short though, but I'll find out soon.

SPLATT

iTrader: (1)

awesome, make sure you post what you get. I would also imagine injectors as the limiting factor. but a graph would be awesome. good luck!

Urban Legend

iTrader: (5)

I ran 32 psi with my P1SC back in the day. All with a 3.4 pulley.

moehorsepower

iTrader: (3)

Definition of How much Boost vs How much Horsepower vs How safe....sure you can run boost till you peg your guage (at least once) What kind of horsepower are you looking for? if you can make you goal at a lower PSI then it will be safe,(providing you have a spot on tune) say app 500 RWHP @ about 7-9PSI. but if you need to make the same amount of HP @ 12+ PSI then the Grim Reaper is just a loud pedal away. Beware of people running an X amount of boost. Their geographical location makes a difference, altitude, air density, octane ect. Just be realistic and know all the "OTHER" parts that will need attention as the HP & TQ go up, Clutch and or Convertor, Drive Train, Fuel System ect. It dominoes very quickly.....