On the two RX7's i have (see sig),
-Both have had the cats removed, and are just downpipe/header to straight pipe to mufflers.
-Both idle in a cycle between 250-600 rpm on the stock tach. The idle is like they are almost dying and then snapping up, then dying, etc. Both rev eagerly and when using the gas pedal they run great.
-Both have simple cone air intakes attached directly to the AFM's.
-Both have had the airpumps and ACV's removed, block off plates and vac caps.
-Both have the vac. nipple from just above and to the rear of the ACV blockoff plate running to their pressure sensors.

I've never looked into the AFR ratio. Does the (theoretically) higher flow of air through things require me to adjust for a richer mix to keep the idle solid?

Thanks for any thoughts here-
steve

 

doesnt seem like anything is out of the ordinary. you just need to play with the idle adjustment thinger-majig. and the idle fuel mixer hickymadoo. search and you shall receive. check for regular tune up as well.

 

^what he said, kinda

 

Besides adjusting the variable resistor, try putting in the stock airbox or rotating the AFM to sit more like stock. Gravity might be closing the AFM door a bit more than usual and suffocating your engine.

 

On the Turbo, it seems the AFM is a cone, not a door. And on the N/A, it's mounted as original.
The simple cone could be restricting the air?

So the answer is Yes, I need to adjust the AFR?

 

could i get picks of all the block off plates that you have installed ?

 

I would suggest adjusting your idle. To need to run richer, you would need to run a good bit of boost, or serious porting.

 

S5s use a different AFM than S4s, so the S4 is the only one could have that kind of problem.

It's more likely the air/fuel mix though. Adjust the variable resistor, and don't forget the jumper wire.

 

you should be hovering around mid 13's for your idle right? but i doubt you have a wideband...it should sound smooth and not mis at all. all the while sitting at or around 800 rpm