Subject: [FlyRotary] Injectors

 

One nagging problem that I have is the engine running rich at low power

levels.  I've turned the fuel pressure regulator down to 30 lbs to get it

reasonably lean, but I still don't have enough adjustment.  The higher power

levels have a pretty good mixture on the default tuning.

 

I don’t know what you mean by running out of adjustment.  Do you mean that turning the mixture knob fully CC it’s still to rich?  If so; follow mode 1 instructions and program it much leaner.  However, I don’t think that’s the only issue.  I could get mine lean enough, but still not get smooth running at low power on those stock primary injectors.  I lowered the fuel pressure by 10 psi and found no noticeable improvement.

 

I could however; get it to run quite nicely of the 500cc MSD injectors that I have in the secondary.  These are still large, but work well at low power.  My solution was to simply move the staging relay from the secondary power circuit to the primary power circuit, so it runs on the secondary at low power and all 6 at higher power (20B).  Problem solved.

This may not be a solution for every case, as my secondary injectors are not all that far from the ports.

 

It begs the question: What did Mazda do to get good idle on those big injectors that we are not doing?

 

Using the 440cc injectors may help; but I don’t think there is any assurance that they will work well.  Didn’t Rusty try this?

 

Al