Ls3/416 running issues need help!
Ls3/416 running issues need help! Ok guys i have a 99 z28 that i had a LS3 put in motor build is a ls3 block with WCC Eddelbrock 245 heads in a 72cc with a 243/247/623/623 on a 112 lsa
intake is a ls6 with 36lb injectors tsp 17/8 headers. Ok so here is the issue the car acts like it has a dead cylinder it only made 410 rwhp...We checked the data log it shows bank 2 slightly leaner then bank one.. We changed coil packs no change changed plug wires no changed. We used a reluctor wheel tool and it checks out... The car idles fine and drives ok but is sputters in lower rpm and im about 70 rwhp short of where i should be and im kinda stumped it still pulls hard and i have to use it for LA invasion does any one have any ideas i could try? Also the tune is spot on so its not the tune.
intake is a ls6 with 36lb injectors tsp 17/8 headers. Ok so here is the issue the car acts like it has a dead cylinder it only made 410 rwhp...We checked the data log it shows bank 2 slightly leaner then bank one.. We changed coil packs no change changed plug wires no changed. We used a reluctor wheel tool and it checks out... The car idles fine and drives ok but is sputters in lower rpm and im about 70 rwhp short of where i should be and im kinda stumped it still pulls hard and i have to use it for LA invasion does any one have any ideas i could try? Also the tune is spot on so its not the tune.
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Double check that you don't have too much lifter preload. If the pushrods are too long it can hold the valves open a bit. I like to have zero lash plus 1/2 turn. Different lifters need different preload though.
Just a thought
DJ
Just a thought
DJ
those 36lbs injectors might not be enough in the top end..both my fuel pump and injectors were maxed out on initial tuning of my 416. i now have 50lb/hr injectors and a racetronix fuel pump with wire kit..but haven't gone back for re-tune (injectors obviously not installed yet)
I would check injector duty cycle at WOT at high rpms, like SIK02SS said and while you're at it, look into the tune one more time. I would think if it had a dead cylinder you guys would know for sure. Just seems like you need to iron out the wrinkles with that combination.
EDIT: You said "the data log it shows bank 2 slightly leaner then bank one." What did the AFR's look like? What fuel are you using? Can you get us that datalog and dyno sheet?
EDIT: You said "the data log it shows bank 2 slightly leaner then bank one." What did the AFR's look like? What fuel are you using? Can you get us that datalog and dyno sheet?
Last edited by KFZ)^; May 27, 2011 at 04:15 PM.
