I have a 2001 Z28 Camaro and I had my car on the dyno a couple weeks ago. My Air Flow Ratio at WOT was at 13.303 at the peak torque. I have read that for maximum power, my AFR at WOT goal should be between 12.8 to 12.9 at max torque.

Is this true?

I am going back this coming Saturday and I will be using LS1 Edit to fine tune the AFR. What is the best way to get from 13.3 to 12.9.

Would it be by multiplying the PE vs. RPM table by 1.03?

Any help would be appreciated.
Thanks,

Al

 

Yes 12.8 to 12.9 is usually best for N/A cars since on the street underload it will be at around 13.0 to 13.1.as far as multiplying by a certain percentage it is a hit and miss.Every car is different,I can multiply one by say 10% and gain maybe a full point then on another car it might up it only .5.

 

Yeah, what he said. But....you want to run as lean as you can without getting any knock. A 13.3 Air Fuel Ratio is pretty fat. You should be able to bring that down & get more power. Too rich will rob power, but too lean will make the motor go

 

double check your air fuel (portable wideband) at 110mph on the road/strip too. Dyno's usually can't reproduce all of the effects that you will see on the street/strip.

If you start to bump into static duty cycle you won't want alot of options on air fuel ratio either. Mine hit 100% @ 6189, so anything above that is just that, 100% fuel.

You can tell when the injectors go static, because there is an uncontrollable dip to richness until the engine's requirements catch up and exceed the injectors maximum flow rate.

 

The place I am going has a Mustang Dyno so the load being applied will represent the actual weight of the car. I'm thinking that since we are using a wide band sensor what I set it at should be pretty close to what it runs on the street.

I have been doing a lot of research on the Internet and I'm getting different opinions about what AFR yields you the most power. I'm hearing numbers between 12.6 up to 13.1. The one’s that sound the most credible is saying 12.8 to 12.9. I think I'll shoot for 12.9 and see how hp and torque I can gain.

Thanks,

Al

 

I continued to make more and more power all the way up through 13.5...........................

 

sure and im sure the egt's increase too. Extended high egt's will melt aluminum quite easily. you're also more detonation due to octane.

prob why they run rich from the factory. gm doesnt want to replace motors with crappy gas and extended high rpm abuse.

 

One more note, whatever you set things at to get max power on a Dyno, will end up being a tad too lean for the track. Remember the air volume increases when the car moves, so you will want to richen it up for street / track purposes.