Mint87RX7

What is the desired afr for an n/a? normally you want richer afr for more power but i keep seeing poeple wanting to lean out a little at high rpm....
and what range of afr's will a narrow O2 read(I know, im not going to tune with it)

Nihilanthic

Depends on load.

At part throttle you want it at stoichometric for emissions, or a lil leaner for better gas mileage. As you increase load on the motor (increasing MAP, for example...) you want to enrich for both power, and safety.

At WOT/max load youd prolly awnt like 12:1 or slightly leaner/richer depending on your timing and everything else. And well, your combustion chamber.... if it were a piston motor, but you're on a rotary, and they're not the best chambers in the world, heh.

Mint87RX7

I dont think na could burn 12:1

rotor_dee

I think it may blowd up if you go that high.

J-Rat

iTrader: (2)

N/As can run safely at MUCH higher AFRs then a boosted car. The correct answer to this would be...

Put it on a dyno and see what AFRs net you the most power. AFRs and power will vary from engine to engine.

classicauto

iTrader: (3)

pfft, at cruising the 02 sensor corrects AFR to 14.7:1 in closed loop.....at least it does when everything still works properly

Jeff_Ciesielski

huh?

fritts

iTrader: (5)

Check out Kahrens 195 whp stock port NA dyno on NoPiston.com in the dyno section. He runs 12.5-13 most of the way through the dyno. At the end of the run he was in the 14's because of the stock ecu not letting the injectors go beyond a certain duty cycle. The engine wasn't blown. I run my FD in the high 15's low 16's during cruise and mid 13's for idle. No drivability issues an no problems with detonation. Lots of misinformation here.

http://www.nopistons.com/forums/inde...=post&id=33473