how much boost will a stock ls1 bottom end take?
04-12-2006, 07:06 PM
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how much boost will a stock ls1 bottom end take? im sure this has been asked before and i know it varries as every car is different but typically how much boost can a stock LS1 bottom end take? im in the market for an LS1 and just want some facts. ive heard of stock ls1's pushin 750 with boost if not more just wanna know before i look into a turbo or procharger. thanksb
04-12-2006, 08:48 PM
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We are pushing 13psi without problems going to 15psi (After fixing the fuel problems) soon on a stock bottom end. Q??(Turbo Kit) did 700'srwhp along time ago when they ran 15-16psi and dyno'd somewhere in the 700rwhp on a stock bottom end.
04-12-2006, 11:15 PM
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upgrading the pistions and rod bolts would be a good idea if you want to run 750...the rods and crank should be good for around 800 to 1000 but i would do the rods while you are in there cause they are only another $500-700. which to me aint bad to make sure your motor does not go kaboom
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04-12-2006, 11:42 PM
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I think it has to do in part with the age of your motor, too. Mine was at about 72k, with probably 12k of that as a heads/cam/headers 400 rwhp M6. Of course, there's also the flipside of that: I know there are several high mileage FI cars that have been discussed on this site that seem happy to make lotsa power.
My motor did fine up until I went FI, where we started to see boost dropping off at mid-dyno run... and getting crankcase pressure. Turned out ol' #7 couldn't hold on... hadn't actually caused any problems yet, but it obviously was not going to handle the boost.
So if you've got a pretty young motor in there, maybe a careful tune and some methanol will allow 8-10 psi. No reason not to put it together and try...
My motor did fine up until I went FI, where we started to see boost dropping off at mid-dyno run... and getting crankcase pressure. Turned out ol' #7 couldn't hold on... hadn't actually caused any problems yet, but it obviously was not going to handle the boost.
So if you've got a pretty young motor in there, maybe a careful tune and some methanol will allow 8-10 psi. No reason not to put it together and try...
