Heading out to the track tonight.
Thread Starter
Racer
Joined: Oct 2005
Posts: 273
Likes: 1
From: Fabens TX
Heading out to the track tonight.
I was just thinking what you all thought of me tuning a little with the predator by richening up at wot ? and see what it nets for me as far as 1/4 times and mph. Also wondering if doing the same with timing advance would be safe , advance timing a little and see what the 1/4 time , mph are at. I'm also at 4500 ft elevation and trying to get into the 13's, last week before tuner I got a 14.2 at 99mph.
Last edited by big454blockchevy; Oct 28, 2011 at 08:17 PM.
Le Mans Master
Joined: Feb 2004
Posts: 8,629
Likes: 16
From: York PA
Get a local professional tune or send your pcm out to ECS for a mail order tune before you blow your **** up.
http://forums.corvetteforum.com/c5-s...nly-149-a.html
http://forums.corvetteforum.com/c5-s...nly-149-a.html
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
1st--whenever you Dis connect your battery or read your tune---or download a tune change- your ECM has to "RELEARN" all the fuel trims---This takes about 50-75 miles of normal driving---SO--any change at the track would not really be an accurate representation of what the " change" did-until it learns out--Typically mods like cold air kits / cat back exh.--will make your P/T fuel lean so the ECM will add fuel to correct the mixture--BUT as a safety that % is also added to your WOT fuel too !!! making it pig rich
2nd---higher altitudes would require LESS fuel to make a correction (based on sea level)
3rd---If your car is bolt on type and stockish-- and has NEVER been tuned--these cars in STOCK trim come from GM very RICH from the factory at WOT---(not lean !) so ADDING more fuel would NOT make it faster--but slower and way lazy --
2nd---higher altitudes would require LESS fuel to make a correction (based on sea level)
3rd---If your car is bolt on type and stockish-- and has NEVER been tuned--these cars in STOCK trim come from GM very RICH from the factory at WOT---(not lean !) so ADDING more fuel would NOT make it faster--but slower and way lazy --
Thread Starter
Racer
Joined: Oct 2005
Posts: 273
Likes: 1
From: Fabens TX
1st--whenever you Dis connect your battery or read your tune---or download a tune change- your ECM has to "RELEARN" all the fuel trims---This takes about 50-75 miles of normal driving---SO--any change at the track would not really be an accurate representation of what the " change" did-until it learns out--Typically mods like cold air kits / cat back exh.--will make your P/T fuel lean so the ECM will add fuel to correct the mixture--BUT as a safety that % is also added to your WOT fuel too !!! making it pig rich
2nd---higher altitudes would require LESS fuel to make a correction (based on sea level)
3rd---If your car is bolt on type and stockish-- and has NEVER been tuned--these cars in STOCK trim come from GM very RICH from the factory at WOT---(not lean !) so ADDING more fuel would NOT make it faster--but slower and way lazy --
2nd---higher altitudes would require LESS fuel to make a correction (based on sea level)
3rd---If your car is bolt on type and stockish-- and has NEVER been tuned--these cars in STOCK trim come from GM very RICH from the factory at WOT---(not lean !) so ADDING more fuel would NOT make it faster--but slower and way lazy --
