LQ4 boost ?
06-16-2012, 07:52 PM
#2
Yes, I have ridden in a newer GTO that blew up the first engine, then was replaced with a 100,000 mile junkyard LQ4, cam and front mount turbo that TJ tuned, It was at roughly 20 psi and kicking *** 
The limit is the rods, the first engine bent the rods, but didnt hurt the pistons, its all in the tune for the most part.
That car runs 9.70's IIRC @ over 140mph.
BTW i see roughly 13 psi / spikes of 14, no issues.
You gonna turn up the boost?
The limit is the rods, the first engine bent the rods, but didnt hurt the pistons, its all in the tune for the most part.
That car runs 9.70's IIRC @ over 140mph.
BTW i see roughly 13 psi / spikes of 14, no issues.
You gonna turn up the boost?
06-17-2012, 01:39 PM
#4
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My stock lq4 butted the rings together on number 7 at 18lbs on 91 octane, 11 degrees of timing. Intake air temps were 118ish, no water meth. Engine had 100k miles and crazy amounts of nitrous put thru it before the turbo.
Now I am at 9 degrees timing with some 101 mixed in and 2 steps colder plug and timing mark on number 7 looks perfect. So may have rattled it just enough to butt the rings up. Be VERY careful with timing. Mine did this and had absolutely no knock retard.
Now I am at 9 degrees timing with some 101 mixed in and 2 steps colder plug and timing mark on number 7 looks perfect. So may have rattled it just enough to butt the rings up. Be VERY careful with timing. Mine did this and had absolutely no knock retard.
