Nick86

iTrader: (1)

Well, I have recently purchased and begun installing an SAFC (blue screen 4 button kind).

I have the following:
1986 GXL
12,000 miles on a Rebuild
Rebuild done with FD housings and a mild street port.
CAI
RB downpipe and presilencer
Dynomax catback

Stock fuel pump
Stock injectors
Stock ECU


Due to the S4's narrow range TPS I will be hooking the SAFC up to the NA boost sensor in an effort to gain full throttle range as far as the SAFC is concerned. Once the unit is all wired in, I'll be heading to the local Dyno shop to have it properly tuned using a wideband O2 sensor.

Here's the probelm - the tuners at the shop are not too familiar with rotaries - and are not familiar with N/A rotaries at all! The guys there are great tuners of regular engines - but not so much mine. They said that they will tune the car to what ever specs I desire, but they don't have enough experience with rotaries to offer suggestions. So my question is:

What AFRs should I be tuning to?

I'm not looking for the optimum power that an N/A can put out (this is a daily summer driven car after all) - but rather a safe setup that will gain some power and especially smoothness in the upper rev range. Everytime I do a search I come up with either numbers for Turbo cars - or percentages that the car was leaned out. If someone could provide me with some Air Fuel Ratios that I could have them tune to - that would be a huge help!

Thanks!
Nick

poor_red_neck

AFAIK, there's really no difference... all cars want the same air/fuel ratio... just if you want to be safe bump it up on the 'rich' side a little more.

JunpoweR

iTrader: (1)

I would tell you to use a wideband O2 sensor and dyno to tune it for more performance and with the cyno you can actualy see the diffrence on paper

Nick86

iTrader: (1)

Of course I'll tune it on the dyno - but the question remains "What AFR's will I tune to?" Am I adjusting the SAFC so that it will hit 6.25:1 on the wideband, or 26.25:1? I have heard that about 13:1 is a good safe range - can anyone confirm that? Thanks!

scathcart

https://www.rx7club.com/showthread.p...ghlight=tuning

Didn't we already cover this?

wtdpn115

i say 13 all across on high acceleration
dont' run it to lean but if u do 13 u should be good

Nick86

iTrader: (1)

LOL - Yeah, but this got resurrected. Thought it may be interesting to see if I got the same answer for both threads!

Thanks