Dyno?

[RETed]

Originally Posted by Grizzly

I just watched the Video a cupple of times and at around 4500 the afr drops from upper 10's to aprox 10.2 afr is that what should be tuned out so it stays solid at for example 10.7 whilst your hitting peak boost? or wouldn't that make much of a diffrence?

It was either going to be too much fuel or not enough fuel...
Either or would cause that dip.
Going with the AFR's you mentioned, it sure sounds like too much fuel...

I wouldn't get critical of the AFR's (and also total ignition advance) until you start to get close to maximum torque.
Looking at your graph, it looks to be right under 6k RPM (if that dip wasn't there).
Running in the 10's that far away from peak torque is just way too much fuel, especially when it's on the lower RPM side of the peak.

With the car on the dyno, that's all you really need in terms of "tools."
(I can argue EGT gauge at this point, but most of you are already tired of that. )
Just adjust fuel as long as power keeps going up - simple.
People get too caught up with AFR's, etc. to understand the dynamics of tuning.


-Ted