Can someone tell me what the AFR should be for a N/A 8? Thanks in advance!!

 

What do you mean, exactly? The factory reality or what would be optimal?
The former is anywhere from 15:1 down to 11:1 under load.
The latter would be 14.7:1 at cruise and 13.5:1 under load.

Oops! Sorry! I didn't mean to answer that! I meant to post this (gotta be consistent):

 

tsk, tsk, tsk

https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/motec-article-formula-mazda-renesis-engine-77846/ (click on the link and then page to the Lambda section)








.

 

Hey now, I'm not a newb and I did search. But I got a gazillion threads with millions of pages and the titles had no indication that they contained the information I need. Now that I made this thread, someone else can come along and search "NA" and "AFR" and find exactly what they need.

Thank you very much.

 

Just being fair. I would have done that to anyone.



Titles are for sissies.

 

I'm believe the best tuned ratio for an n/a car to produce the most hp safeley is between 13.2-13.4. I'm not an expert thats just my understanding

 

dazy are you getting your car tuned? what engine management system are you using?

 

ahh, I was only 'ing ya'

 

sometimes my car feels like the AFR is 1:1, the tack goes up as fast at the gas drops....lol

That said, I hooked the car up to a wide band (with the old motor) and noticed about 13.2-13.5 at cruise (steady light throtle, 72mph on the hwy, lvl ground, 85* amb temp) and anywhere from 10.8-12.8 durring WOT on the same road (depending on gears, the higher gears gave a richer AFR

hope that helps.

 

Mine typically sits at 14.4:1 at 4000 RPM cruise for 7 seconds after which it abruptly switches to 13:1, gradually slipping down to 12.7:1. Letting off the throttle for even a split second puts the mix back to 14.5:1 or so.
That is the CAT protection scheme.
Obviously, my WOT numbers are useless to this discussion.

 

KYliquid- thats weird

Jeff- why is yours slipping to even 12:1 at cruising? because of the TC? i havent seen mine do that while cruising. hmm maybe i should log a couple runs and take a closer look

 

If you hold the load even, that is the CAT salvation strategy on the M-flash.
I don't know if they changed it after that and I don't intend to find out.

 

 

I'm considering it. You know I'm not turbo, but with my mods, I don't think it would hurt. I'm doing prelim research right now so I don't know about the engine mgmt system.