How long did your "Long/Short Block 4.8 5.3 5.7 6.0 6.2" last Boosted?
04-05-2013, 11:17 AM
#21
I see alot of threads about boosted LSx engines making tons of power and am curious to how many of you guys have blown one up from either user error, tuning errors or strait up power.
So far I have had pretty good success with these little monsters, but have also had a failure aswell.
Lost the last 5.3 in my blazer about a month ago, had #5 injector go bad which melted the piston on relatively low boost and timing. AFR was 10.97, 9psi, 11 deg timing, midway thru 3rd gear I melted that slug. Actually didn't know anything was wrong until I pulled back into garage and noticed puffing smoke from my breather. ZERO compression on #5.
Since then, installed a L33 long block, new 60lb injectors and been flogging ever since with no issues on 5-9-13-15psi.
Would like to see actual experiences that killed it.
What LSx it was? Boost? Timing? AFR? When during pull?
So far I have had pretty good success with these little monsters, but have also had a failure aswell.
Lost the last 5.3 in my blazer about a month ago, had #5 injector go bad which melted the piston on relatively low boost and timing. AFR was 10.97, 9psi, 11 deg timing, midway thru 3rd gear I melted that slug. Actually didn't know anything was wrong until I pulled back into garage and noticed puffing smoke from my breather. ZERO compression on #5.
Since then, installed a L33 long block, new 60lb injectors and been flogging ever since with no issues on 5-9-13-15psi.
Would like to see actual experiences that killed it.
What LSx it was? Boost? Timing? AFR? When during pull?
04-05-2013, 11:44 AM
#22
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For this specific vehicle, I like the less weight of the 5.3 - I just stumbled across a good deal at the local yard otherwise it would have another iron 5.3
However, my old SS was a freak for some reason. Showed 545rwhp on 9psi with low timing with the 6.0 but I was able to be in full boost by like 2500rpm and stay with or beat 650rwhp vehicles. The blazer doesn't feel quite as fast as the SS did on the same boost setting, maybe its the auto vs 6spd I dunno. I need to throw the blazer on the dyno or throw some slicks on it and get some times/#'s out of it.
However, my old SS was a freak for some reason. Showed 545rwhp on 9psi with low timing with the 6.0 but I was able to be in full boost by like 2500rpm and stay with or beat 650rwhp vehicles. The blazer doesn't feel quite as fast as the SS did on the same boost setting, maybe its the auto vs 6spd I dunno. I need to throw the blazer on the dyno or throw some slicks on it and get some times/#'s out of it.
