Figured these are probably common or soon to be common questions so I figured I'd ask here and everyone can benefit from the answers. Bare with me if some of these have been answered I searched to no avail.

1. What happens to the fuel curve above the 6608rpm setting?


2. Has anyone tried installing a larger afm and adjusting it? Or adjusting the stock one before tuning? (you can stiffen the spring and it should then be able to relay a signal to a higher airflow) That way you wouldn't run into the load issues for timing? (obviously the next upgrade will eliminate this issue anyway, just curious)

3. Would I be able to fix the idle if I did modify or change the afm?

4. Would it be a good idea to datalog with the safc2 still set up? Then zero it out and start tuning? Could I just run the 2.0 with the inj set to 550/720 same as the 1.7, or am I
missing something?



Thank you,

Brent

 

I guess it doesn't make any sense to modify the existing afm other than to try to smooth things out for changes in ve and such. No point since you can tune with the 2.0 anyway. Still interested in installing a larger one though. Maybe off a 5.0L?

 

Hi Brent,

1. The last rpm cell in the AFC table is used for that rpm and higher.

2. The RX7 AFM is pretty big as it is. I've looked at various other setups, mostly hotwire type (the Ford 5.0 is a hotwire system btw) and concluded that it would be better to just go MAP based instead. sw for that is not finished though... the next release will have the first bit of this functionality, but just for controlling timing.

3. What's up with your idle? The next release will extend the AFC cell range to cover idle. I've been using this on the 90 GXL and it works well (actually smoothed out my idle a fair bit and uses less gas as well).

4. Unless you really need the AFC to extend current adjustment range, I'de remove it althogether.

-Henrik

 

Thanks Henrik, I was referring to being able to fix the idle if I swapped in a larger afm. I would definitely prefer map as you said. From what I've read it seems to be the way to go. I've been studying up on ecu's and tuning for a while now. Up until lately I've always stuck to building engines and doing the mechanical and fabricating work. I'm anxiously awaiting the next release even though I'm just getting started on the 2.0.

So if the afm is large enough why are people seeing the maximum load cell so early? I thought the load was based on afm readings? Any idea how much hp can be made before the afm signal is maxed? I realize pressure on the door changes with humidity and things, but is there a ball park figure that you shouldn't try to exceed while running the stock afm?

The safc is still being used right now because I don't feel like tuning now it's around 0 degrees celcius still most days. I'll just end up retuning in a mnth and the car runs quite well for the most part. Just rich under half throttle. Not to mention I'm still trying to complete the rest of the car.LOL. So I don't drive it that much, mostly work on it.

Thanks for your time,

Brent