I was finishing off my tuning with some WOT runs. My car had the quickest 1/4 mile times with a constant AFR of 13.6 at WOT. This seems way too lean but the car really likes it. I have no knock and run 25 degrees total timing with 083 iron heads and 10.5 compression. I can raise timing a bit but the car doesn't respond any better up top. It feels very good and the best times are at that 13.6 range. I added more fuel and brought it down to 12.7 and gave it more timing. The car felt heavy and the shifts were slower but more aggressive but times were way down. I took more fuel away each time and each time my ET improved. I did bring timing back down to 25 total when I finally got to 13.6.

Do I have something out of whack on my tuning??? Is it really that terrible to have that lean of an AFR at WOT??? It seems everything I read says power is in the 12.5-13 AFR.

 

You tune to what the engine likes, and it runs it's best when happiest.

The first absolute rule about AFRs at WOT, is that it varies, by application. If everything you do slows the car down, you've found the sweet spot.

25d is fine. Obviously, you haven't gotten addicted to the more is better logic, which is a good thing.

Congrats.

 

Thanks for the response. I have only ever tuned my own car so I can't look to past experiences to get my answers sometimes. I was really worried that I was going to have to start all over again at square one.

I tried one nitrous run on the WB. The AFR did dip down into the high 12's which is fine. I know I am not brave(or stupid) enough to try WB tuning on nitrous but its nice to see the extra fuel coming in there.

 

Back in the early 80s I had a customer with alot of money and the need for speed, he had a rather complete collection of torched pistons. He got to having the power he wanted when he started bending front end parts from doing wheelies.....

I can't help to wonder with EFI what kind of combo could be done. There's some Viper guys using Propane rather then fuel for enrichment. The Propane having no where's near the lag in getting to the engine that fuel does. Seems like a couple GM ecms piggy backed could make for some accurate control of fuel and nitrous. Or someone figuring out all the addition inputs and outputs in say a 730/749.