When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Good morning and early Merry Christmas to everyone!
Took my 17K semi-stock 2003 to get A&A SuperCharger, mild cam, 3.42 rear end, long tube headers, beefed up transmission and tune to a reputable shop. Install went well, first couple of Dyno tunes went "well" although the SC was making about 14lbs of boost. They tests drove it and say the car actually broke loose at 60mph. Put the car back on dyno and broken ring landed on the #7 piston and cracked sleeve on block. They're now saying the T-Trim SC was too much for the bottom end because I was using the 3.6 pulley. Shouldn't an experienced tuner at some point stop pushing so hard before breaking the engine? Blaming a small pulley seems a little lame to me.
Been digging a lot last 2 days and talked to 4 Tuners that mostly work on LS based engines, all said the same thing...Too much timing, fuel too lean, and revved way too high. An experienced LS tuner should've known to back off because they would've known about the #7 issue.
14lbs is waaaaay to much boost for a stock LS1. Most kits try to keep it at 8lbs with a stock crank pulley and 3.8 upper pulley. Don't believe anybody who recommends higher on stock internals!!!!! Their day of reckoning is coming.
I have a like new/never modified LS1 in a 2001 Corvette w/ only 26K miles. It will be taken out soon by a forum sponsor on here. Located in Louisiana
PM for details
to take advantage of the blower, I'd consider a better alum block like the l33, ls2 or ls3
the early ls1 blocks have thin liners and the hyper pistons aren't going to take much detonation before cracking and failing
the combination of lots of boost, high compression, low octane = too much cylinder pressure, detonation and the ensuing broken parts.
no engine will survive prolonged detonation, and with the stock short block and 14 psi you would need heavy meth injection or pulling timing or better still e85 to expect the engine to survive the cyl pressure
Tuner should not only KNOW that, he should be flogged for ruining your engine. Did you say it was ok to run 14 and pump gas??
Not that the engine can't make the power, but it's like hiding a brick by throwing it way up in the air and it hurts someone often when it lands
Thanks for the feedback everyone. I'm sure I have a fight on my hands. Anyone to the question, is it worth resleeving #7 and forging the bottom end? Or do I scrap the block and start fresh?
Thanks for the feedback everyone. I'm sure I have a fight on my hands. Anyone to the question, is it worth resleeving #7 and forging the bottom end? Or do I scrap the block and start fresh?
you are looking at around 300 to sleeve it
I wouldn't do it. Too many deals on good blocks that are way stronger. The ls1 isn't the best for FI
14lbs is waaaaay to much boost for a stock LS1. Most kits try to keep it at 8lbs with a stock crank pulley and 3.8 upper pulley. Don't believe anybody who recommends higher on stock internals!!!!! Their day of reckoning is coming.
Plenty of stock bottom end cars running well over 8. If the tune is good, and car has appropriate supporting mods (fuel system)- they can survive.
yes- no guarantee- every car is different- but they are out there.
I started my journey at 7psi, I’m sitting at 14.9 today and have put 100k on my blown setup. Hell- I put so many miles on my p1sc imploded and early diag mentioned age /miles on head unit and internal gear sheared.
That is just to sleeve the block. There is the tear down, removal of the block from the car, transport the block to a shop, transport the block back, reassembly and reinstall,
honestly doesn't matter at this point, they aren't owning up to that.
what did it make for power since it was on a dyno? what did you have for a fuel system? what fuel. I'm assuming you dont have access to the tune, i'm curious how spicy the timing was.
14psi sounds like alot for someone debuting a blown LS, typically on a blower sbe setup, you'll wet your feet at 7-8psi, and turning it up from there. then maybeeee make it to 14psi after a year or 2 of dialing in the setup. when my LS6 finally failed, I found an LS2 to take it's place, most of the accessories to swaps over, and you get to reuse your top end. the GenIV SBE is more stout if you're keeping it stock
honestly doesn't matter at this point, they aren't owning up to that.
what did it make for power since it was on a dyno? what did you have for a fuel system? what fuel. I'm assuming you dont have access to the tune, i'm curious how spicy the timing was.
14psi sounds like alot for someone debuting a blown LS, typically on a blower sbe setup, you'll wet your feet at 7-8psi, and turning it up from there. then maybeeee make it to 14psi after a year or 2 of dialing in the setup. when my LS6 finally failed, I found an LS2 to take it's place, most of the accessories to swaps over, and you get to reuse your top end. the GenIV SBE is more stout if you're keeping it stock
I didn't get the Dyno but he said it was making 642 on stock fuel system. Of course I haven't seen the tune.
How much Boost
