Is there something wrong with the air to fuel part of the dyno sheet. Someone on our Oklahoma forums made a wise crack saying they need to learn how to tune since the A/F ratio looks like a heartbeat monitor. Is that right or is it common to see a little wavering?

 

just running a bit rich. it's fine the way it is, it's better to be too rich than too lean.

 

I don't know of any dyno sheets that show a straight line for the A/F ratio....

You are running a little rich (notice the dotted line @ 13? That's probably the safe zone underneath it), but its like nanaki said.

 

A/F ratio will vary some throughout the dyno run with the rising RPM's, which yours isn't too far off. As far as I know, it would be better to be as close to 13 as possible. But like nanaki said, better to be rich, than lean.

 

12.0 is kind what you wanna shoot for, but 11's will be more forgiving for varying conditions, unless you plan on using 2 or 3 different tunes. I have a tune for the summer, winter, and 112 octane. Winter runs richer for the denser air, summer runs leaner for the thinner air, and we pushed in the timing and pushed the A/F close to dangerous with the 112 octane.

 

Cool thanks for the tips guys. Helps quite a bit.

 

why doesn't the hp & tq cross at ~5200 rpm?

 

From what I understand it's because the hp and tq are on a different scale.

 

Where do you live that it's 88 degrees right now?

 

Ada, OK