LS6 question
#1
Instructor
Thread Starter
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
#2
Race Director
Member Since: Oct 2000
Location: Deal's Gap 2004 NCM Motorsports track supporter
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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.
#3
Racer
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
#4
Tech Contributor
Member Since: Oct 1999
Location: Charlotte, NC (formerly Endicott, NY)
Posts: 40,076
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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
#5
Burning Brakes
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
#6
Melting Slicks
O2's are not being read at WOT or whatever throttle percentage kicks in PE mode, they they are off.
The MAF should take care of anything that small in the tune. It will adjust.
The MAF should take care of anything that small in the tune. It will adjust.
#7
Gasoline Addict
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.
#9
Melting Slicks
WOT uses MAF, IAT, and MAP only once in PE mode.
But I may be wrong.
#10
Race Director
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.
#11
Racer
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.
#12
Race Director
Member Since: Oct 2000
Location: Deal's Gap 2004 NCM Motorsports track supporter
Posts: 13,912
Received 1,101 Likes
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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
#13
Instructor
Thread Starter
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