Where are my CEL's??????
Thread Starter
Safety Car
Joined: Feb 2007
Posts: 4,939
Likes: 448
From: CHOCOWINITY NC
Thanks Spin....
I haven't done any tuning yet. Added LG's and a Halltech and the car is running great at 7K miles. Been reading a lot on the LS3 differences and don't know where to start quite yet. I have a Cruising around scan and a base tune I'll shoot you later (they're on the other computer). Thanks for the offer of assist..
I haven't done any tuning yet. Added LG's and a Halltech and the car is running great at 7K miles. Been reading a lot on the LS3 differences and don't know where to start quite yet. I have a Cruising around scan and a base tune I'll shoot you later (they're on the other computer). Thanks for the offer of assist..
Racer
Joined: Dec 2006
Posts: 343
Likes: 1
From: Houston TX
When you exceed the car ability to run stoic and the long term fuel trends are too positive it will actually run lean at part throttle which over heats the cats and that why the rear O2's trigger.
Running that positive in closed loop causes the car too be too rich at WOT which is the source for insufficient light off. Hence the codes some cant get rid of.
Running that positive in closed loop causes the car too be too rich at WOT which is the source for insufficient light off. Hence the codes some cant get rid of.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
There is a limit and most tunes turn off the Cat over temp protection that dumps additional fuel in WOT (up to a max enrichment value of 1.21). It keeps the car from getting too rich near the HP peak but also allows the cats to get too hot which is a famous target for turning off rear O2's. Most cars with headers that arent tuned are so rich (WOT- they are lean in closed loop hence the additional fuel dumped calculated by the LTFT'S) and have even more fuel being dumped by the COT that cat inefficiency is the code tripped if not from being lean in closed loop.
Last edited by SpinMonster; Dec 8, 2007 at 12:06 AM.
