Looking for some opinions on this log file.

[animuL]

98 Corvette weekend driver with naturally aspirated Texas Speed 408, 10.5ish:1, 91 octane (its all I can get here), 239/247 .624/.624 115lsa, PRC 237cc, AFX wide band, 75mm FAST intake, stock TB, stock exhaust minus cats, auto trans.

The attached files are where I am at after 21 iterations of tunes following the instructions in the help guide for speed density tuning and using the multiple by % - half. It's not as ideal as I had hoped but it seems like I got this close after 5 or so iterations and now I just chase the weather conditions or something (I've been tuning on it every other weekend for a few months). The car seems to run great and I think I am ready to plug the MAF back in but wanted to get some opinions first. There is one main concern I have: I'm seeing knock at WOT with just lower 20's timing on my "safe" afr of mid to lower 12s. I would expect to be able to run 27 degrees of timing and 13.0:1 with no kr. This log was done when it was about 80° out. Should I be concerned and trouble shoot this or move on to tuning the MAF and worry about the timing later? Car pulls hard and runs smooth, idles great, and drives like stock... just like I want it to.

[animuL]

Nothing?

[Russ K]

First thing, install a 160*F thermostat & lower your fan temps as your hitting 198*F ECT. Should also have a least one heat range colder than stock spark plugs. And you should also know that the 1997-98's only support a max of 24 bytes for scanning (your at 26), that's why your chart view is stair stepped.

The VE table should follow the torque curve of the engine, so it should be lower after peak torque. Your VE table stays the same from 4800 RPM and up. That's why your AFR is too rich at the higher RPM.

My 11.5 CR 418 only takes 22* timing on 94 octane with 2 heat range colder plugs and a 160*F stat. LS engines don't need much timing to make power due to the cylinder head design.

Russ Kemp

[animuL]

Thanks for the advice. I'm running TR6s at .040 and have a stock thermostat in the car. People seem to be all across the map as to what tstat to run. I've always just gone with stock but I suppose going down to a 160° is worth a try. I looked back thru some info and my compression ratio should be 10.3:1 and quench is .037".