Problem after G5X3 Install
Thread Starter
Staging Lane
Joined: Sep 2002
Posts: 84
Likes: 0
From: Texas
Problem after G5X3 Install I installed a G5X3 cam in my Z06 over the weekend and had it dyno tuned yesterday. I'm running LG headers with cats and all the bolt-ons. I pulled a dissapointing 363 rwhp and 330 ft-lbs tq. So I found the problem today and it turns out that cylinder #8 was dead. The pushrod had come off the rocker arm so one of the valves was close up all the time. So my car was tuned on 7 cylinders. Here's my problem....
The car runs terrible now and is sluggish. I drove it one mile down the road and pulled over because I smelled smoke. It turns out my cats were cherry red
I let it cool down and drove it home. When I got here the cats were again cherry red. I know cats are supposed to get hot, but not that hot. Something is definetly wrong. What gives?? Any advice?
The car runs terrible now and is sluggish. I drove it one mile down the road and pulled over because I smelled smoke. It turns out my cats were cherry red
I let it cool down and drove it home. When I got here the cats were again cherry red. I know cats are supposed to get hot, but not that hot. Something is definetly wrong. What gives?? Any advice? Its running really lean now that you have all 8 cyl.If it was tuned on 7 cyl and afr was tuned that way. Add about 11% more fuel for the dead hole and it will be close.FYI you need to redyno tune with widebands to make it right.
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Thread Starter
Staging Lane
Joined: Sep 2002
Posts: 84
Likes: 0
From: Texas
Problem solved! JmX and I had taken the coil packs off twice and the second time I forgot to plug the wires back in on the passenger side 
I must've been dumping fuel like crazy into the cats. I'm determined to run on less than 8 cylinders, lol. Thanks for all the advice guys....luckily it was something simple.
I must've been dumping fuel like crazy into the cats. I'm determined to run on less than 8 cylinders, lol. Thanks for all the advice guys....luckily it was something simple. 
get it retuned 
TECH Fanatic
Joined: Mar 2003
Posts: 1,839
Likes: 0
From: La Porte, TX
Originally Posted by Insomniak
let us know how much it puts down now after the tune! 
Matt
Thread Starter
Staging Lane
Joined: Sep 2002
Posts: 84
Likes: 0
From: Texas
Originally Posted by WS6snake-eater
Justin called me this afternoon. He has everything running good now, and went back and got a re-tune. The car put down 434 rwhp, and 405 rwtq. I'm sure he'll be posting up the graph shortly. Good job Justin.
Matt
Matt
https://ls1tech.com/forums/dynamometer-results-comparisons/230604-g5x3-112-cam-only-dyno-results-434-rwhp-405-ft-lbs.html
I actually just got it dyno'd today. I'll go back for a re-tune next month and lean it out a little more.