[watman02]

Originally Posted by Mach828

How much spark can I get away with without detonating on 91?

Bumped her up to 19 at 3k, 18 at 4k, 17 at 5k, then 16 at 6k+. It was not happy and had some detonation just before 4k. Whoops. Also had my base fuel table set to taper from lamba to about .78. So I'm thinking combined with 18-19 degrees of timing with a 12.2 air fuel and 3-4lbs of boost, it was not happy. Is my timing too aggressive for 91, or should I just change the base fuel table transition?

Can timing affect your AFR? Advancing timing just means you are commanded spark earlier, right? Where is the piston at during ignition at 0 degrees vs. 20 degrees advanced?

Do I need to change anything in the tune because I have 96 cobra intake cams with the extra 20* of duration?

I would comand .78 at any point you are in boost. My car with the cruise on and pulling a hill will make 4-5 # afr is 1.0 or 14.7 and timing is in the 20's! I dont hear anything and plugs look fine also run 93 octane
when i was at 7.5# i was running a max of 17* timing and the car was faster than it is now. Just saying?
Also your timing vs rpm should if anything got opposite of how u have it as the piston is moving faster(higher rpm) you advance the timing my car has 15* timing from 2000 to 7000rpm under wot.
18* timing at 5# and 4k dosnt sound like alot but if ur knocking then back it off!