Help. Ls2 tuning problems. Timing issues
Thread Starter
Instructor
Joined: Oct 2011
Posts: 131
Likes: 0
From: ELK GROVE CA
Help. Ls2 tuning problems. Timing issues
I have an 06 , 6speed, LS2. It has a callaway honker, FAST 102, LS7 exhaust and Texas speed cam. .595/.598 232/234 @ .050 duration on a 112 LSA. The car runs fine but only put down 395RWHP on a dyno run last Wednesday. The car keeps pulling out timing. about 5-7 degrees at 5000 rpm. It is only at 17 degrees total timing. It is as though the car senses a knock and keeps pulling it out. As i said, the car runs good but not nearly as hard as it should for the parts it has. Does anyone have any ideas. I did read that the NGK TR55 plug isnt the best choice so I changed to TR6 yesterday....
Any ideas.. I spent $1,000's on this and want everything to be right.
Thanks,,,, Jason
Any ideas.. I spent $1,000's on this and want everything to be right.
Thanks,,,, Jason
Instructor
Joined: Aug 2007
Posts: 154
Likes: 0
From: Belton Tx
I have an 06 , 6speed, LS2. It has a callaway honker, FAST 102, LS7 exhaust and Texas speed cam. .595/.598 232/234 @ .050 duration on a 112 LSA. The car runs fine but only put down 395RWHP on a dyno run last Wednesday. The car keeps pulling out timing. about 5-7 degrees at 5000 rpm. It is only at 17 degrees total timing. It is as though the car senses a knock and keeps pulling it out. As i said, the car runs good but not nearly as hard as it should for the parts it has. Does anyone have any ideas. I did read that the NGK TR55 plug isnt the best choice so I changed to TR6 yesterday....
Any ideas.. I spent $1,000's on this and want everything to be right.
Thanks,,,, Jason
Any ideas.. I spent $1,000's on this and want everything to be right.
Thanks,,,, Jason
It sounds like the guy tuning your car wasn't too experienced.
Pro
Joined: Sep 2012
Posts: 613
Likes: 10
From: Magnolia Texas
Don't believe cats will cause timing to be pulled out and clogged cats don't cause knock. The car appears to be running lean. What does your air/fuel ratio look like through the dyno pull? Did your tuner give you the data or at least a graph? My guess is the tuner isn't very competent. Your setup should be very safe with AFR in the 12.75 range. Did the tuner work with your PE at all?
Former Vendor
Joined: Oct 2007
Posts: 2,032
Likes: 6
From: longview tx
we run that cam ALOT. you can get 26-29* of timing with it with a CAi and headers, so minus off a couple for not having LT headers and you should still be able to get 24-25* SOOOO i would say you could have a plugged cat, yes that will cause knock and pull timing i have seen that, but its not the most likely. are all your grounds good? if one ground is loose or anything it will cause this believe it or not i have seen it more than once on vette's. Can you hear the knock? or is the computer just pulling the timing? you should be over 400 wheel on that car with a stick
