Redshift

A/F ratio is around 11.1:1 from 3000 RPM to redline. Very rich. I've been hearing different things on whether to lean out the LS6 or leave it running rich for safety due to the high compression. What are your thoughts? Here's the dyno chart:

<img src="http://www.pfyc.com/z06/afterheader.gif" alt=" - " />

By the way, after installing the headers and cats and x-pipe, I drove the car right to the dyno and got these results. How long does the PCM really need to learn after doing such mods? I keep hearing different things on that - some say it learns right away, some say it takes a while. I did have the battery disconnected for more than 12 hours overnight.

???

<img src="http://www.c5forum.com/ubb/z06sig.jpg" alt=" - " />

<small>[ March 29, 2003, 10:10 PM: Message edited by: Redshift ]</small>

niphilli

Yes, you will definately benefit from tuning. It is a good idea to leave the car a little on the rich side rather than a little on the lean side, but a good "safe" A/F is about 12.5:1 yours is very rich. I would definately reccomend a good 100 miles of driving after any modification, or CPU reset in order to give your CPU learn time. There will probably be some gains to be had in your timing tables as well if you do decide to edit it. Do a search in the eastern section for Z-06 tuning results. Mike @ rapid tuned a bone stock Z not too long ago with some great results.

-Nick

NoGo

iTrader: (2)

I would say at LEAST 10 HP from tuning. An 11:1 a/f is very rich. Even with learning, you will probably not get over a 12:1 a/f ratio.

It is cars like yours that tuners love to see get strapped onto the rollers, because we can always make big gains with rich cars.

Good Luck,
Kevin