LQ-4 Motor Limitations
07-01-2010, 09:46 PM
#1
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LQ-4 Motor Limitations What's the most horsepower that an LQ-4 motor hold? I'm about to have my car (which has this motor) brought from 5 lbs of boost to 12 lbs of boost. Curious to see how far we can go with it. Thanks for your input.
07-01-2010, 10:23 PM
#2
Is it stock pistons? If so would stay at 5 to 7 , possibly 10 with lower compression heads. Past that crapshoot on what the rings can take assuming the 6.0 stock pistons are same hypercrap that ls1 pistons are made of? I went straight to forged parts in my 6.0 so didn't have to worry as much. After forging the answer to how much power is lots.
07-02-2010, 01:53 AM
#3
Well to help you out a little, We are running a 00 model 6.0, t88 gt-45 turbo, in a 89 fox body, The engine is stock other than mls painted head gaskets, head studs. We are running 10#s mostly, But when running the car hard we go to 13#s with a 75 shot to get the car out the hole. But it quits spraying once you shift to second gear. No problems an engine has been going great for over 4 years now.
07-02-2010, 11:27 AM
#4
Well to help you out a little, We are running a 00 model 6.0, t88 gt-45 turbo, in a 89 fox body, The engine is stock other than mls painted head gaskets, head studs. We are running 10#s mostly, But when running the car hard we go to 13#s with a 75 shot to get the car out the hole. But it quits spraying once you shift to second gear. No problems an engine has been going great for over 4 years now.
4 years is obviously a long time. I have seen the ls1 and lt1 stock pistons go bye bye in minutes and not even at high boost levels and on supposedly good tunes. Was even keeping a few as souvenirs although they weren't from my car.I went straight to forged after seeing those stock destroyed ones. Ringlands went bye bye.
07-02-2010, 02:56 PM
#5
he was also lifting the heads in this video since then switched to LS9 gaskets and studs & fixed the problem
http://www.youtube.com/watch?v=6s9ZUwjsUKY
http://www.youtube.com/watch?v=6s9ZUwjsUKY
07-02-2010, 10:04 PM
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Ive been around 800 rwhp in my fox body wiht a stock bottom end 6.0 , 148 mph in the 1/4 @3250lbs 14 psi pump gas and twin t70 turbos.
I have also been as high as 18.5 psi on my old stock bottom 5.3 with a single t76 and it made around 600 rwhp.
Its all in the tune up!
I have also been as high as 18.5 psi on my old stock bottom 5.3 with a single t76 and it made around 600 rwhp.
Its all in the tune up!
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07-04-2010, 06:11 PM
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The only thing i have in the motor, well on it, was ARP head bolts. Everything else is stock, iron block. Motor came out of a 2500 Chevy p/u truck, with 1800 miles on it. So far, its great. Like i said, we'll be going for 12 lbs of boost. Sounds like we'll have no problems. Let u know what happens after.
