LS6 question
Thread Starter
Instructor
Joined: Dec 2007
Posts: 231
Likes: 10
From: NH
LS6 question
Does the stock ECM program in a 2002 C5Z have enough range to safely run a HDPE car with out the cats???? or will it need to have a custom tune to not run lean??? I have a stock H pipe that has melted both cats and can hollow them out easily. The car has a SLP cat back set up now other than that it is a stock motor, this is a track only car so no emission concerns. Has anyone have actually tracked a C5Z this way?
Thanks for any responses
Bob
Thanks for any responses
Bob
Race Director
Joined: Oct 2000
Posts: 14,064
Likes: 1,166
From: N. Alabama
Having never done that particular configuration but, considering all that I have done to mine, I wouldn't worry about it at all. 
You probably know already but mandatory items: fresh brake fluid, good pads and an extra quart of oil added when at the track.
You probably know already but mandatory items: fresh brake fluid, good pads and an extra quart of oil added when at the track.
Racer
Joined: Mar 2009
Posts: 312
Likes: 11
From: Cleveland Ohio
Does the stock ECM program in a 2002 C5Z have enough range to safely run a HDPE car with out the cats???? or will it need to have a custom tune to not run lean??? I have a stock H pipe that has melted both cats and can hollow them out easily. The car has a SLP cat back set up now other than that it is a stock motor, this is a track only car so no emission concerns. Has anyone have actually tracked a C5Z this way?
Thanks for any responses
Bob
Thanks for any responses
Bob
Tech Contributor
Joined: Oct 1999
Posts: 41,063
Likes: 9,826
From: Charlotte, NC (formerly Endicott, NY)
Does the stock ECM program in a 2002 C5Z have enough range to safely run a HDPE car with out the cats???? or will it need to have a custom tune to not run lean??? I have a stock H pipe that has melted both cats and can hollow them out easily. The car has a SLP cat back set up now other than that it is a stock motor, this is a track only car so no emission concerns. Has anyone have actually tracked a C5Z this way?
Thanks for any responses
Bob
Thanks for any responses
Bob
Bill
Burning Brakes
Joined: Nov 2011
Posts: 1,201
Likes: 16
From: SoCal
Does the stock ECM program in a 2002 C5Z have enough range to safely run a HDPE car with out the cats???? or will it need to have a custom tune to not run lean??? I have a stock H pipe that has melted both cats and can hollow them out easily. The car has a SLP cat back set up now other than that it is a stock motor, this is a track only car so no emission concerns. Has anyone have actually tracked a C5Z this way?
Thanks for any responses
Bob
Thanks for any responses
Bob
Gasoline Addict
Joined: Jun 2013
Posts: 1,052
Likes: 47
From: Twin Cities, MN
While there are parameters within which the ECM can compensate A/F mixture and timing to ensure no detonation takes place, once you introduce intake mods (and major exhaust mods) the original look up tables are not going to be sufficient to ensure accurate MAF scaling at WOT. While this is a lot more evident in turbocharged cars, it is a lot safer to spend $400 on a tune and run a little richer if you track your car, than it is to risk losing an engine. If you haven't owned the car from the very beginning, it is possible that one of the previous owners could have had the car tuned and modified, and returned it stock without flashing a stock map back on.
Race Director
Joined: Oct 2000
Posts: 14,064
Likes: 1,166
From: N. Alabama
But the long terms take a que from the short terms that use the O2 sensors and therefore adjust for open loop (WOT) over time, correct?
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Melting Slicks
Joined: Jun 2002
Posts: 2,591
Likes: 144
From: Mobile al
WOT uses MAF, IAT, and MAP only once in PE mode.
But I may be wrong.
Race Director
Joined: Oct 2002
Posts: 10,864
Likes: 198
From: Southern CA
I hope this is not too afar for the thread, but I had a discussion about octane and race gas today & my buddy said a racer he knew lost an engine due to detonation/low octane. He said the gas was old but properly stored (whatever that means) and that the racer found out (later) that gas loses octane the longer it sits stored.
You comments.
You comments.
Racer
Joined: Mar 2012
Posts: 446
Likes: 1
From: Christiansburg VA
I hope this is not too afar for the thread, but I had a discussion about octane and race gas today & my buddy said a racer he knew lost an engine due to detonation/low octane. He said the gas was old but properly stored (whatever that means) and that the racer found out (later) that gas loses octane the longer it sits stored.
You comments.
You comments.
Race Director
Joined: Oct 2000
Posts: 14,064
Likes: 1,166
From: N. Alabama
I hope this is not too afar for the thread, but I had a discussion about octane and race gas today & my buddy said a racer he knew lost an engine due to detonation/low octane. He said the gas was old but properly stored (whatever that means) and that the racer found out (later) that gas loses octane the longer it sits stored.
You comments.
You comments.
http://www.fuel-testers.com/expirati...hanol_gas.html
Thread Starter
Instructor
Joined: Dec 2007
Posts: 231
Likes: 10
From: NH
Thanks for the replys I have owned the car and tracked it for a few years I had it flashed to the current stock tune in 2012, we have 2 cars and the other car melted the cats due to a bad primary coil ground. ( died at full throttle 15 min into a session) I had a back up set and replaced them my plan is to run these hollow for the last event just to get a bit more out of the car the car has 88k on it and the ls6 is going to need a refresh this winter.
The other thing with pump gas that many don't know is the first few gallons of "93" are not really 93 so I always fuel the truck 2 or 3 gal than fill the cans, trick learned form racing dirt bikes....
Thanks again
Bob
The other thing with pump gas that many don't know is the first few gallons of "93" are not really 93 so I always fuel the truck 2 or 3 gal than fill the cans, trick learned form racing dirt bikes....
Thanks again
Bob