So I have a wbo2 and a safc on their way to my door step. I have played with the safc on previous cars. Which brings me to my question. What A/F ratio does everyone run? Going off of this thread https://www.rx7club.com/rtek-forum-168/thumbs-up-s5-na-2-0-a-668832/ Low 13s seem to give a great job for power. I also tuned for low 13s on my previous cars and saw a nice power gain.

 

sounds like a good start to aim for. You wont know for certain until you stick the rear wheels on a dyno and do some pulls.

Just a thought, but for about the cost of an SAFC you could get an RTEK that can directly control fuel and spark without tricking the computer.

BC

 

Ya I wouldnt mind getting some dyno tuning, but in all honesty I am not after any big numbers.

Not really gona agree with the rtek vs safc in price. I picked up a used safc 1 (remiber not after big power) for 130 shipped vs 399 for the rtek. So I got my safc and wideband o2 for the price of rtek. Big reason for goin safc is my scca class doesnt let you modify the ecu case. Which to tune your rtek you have to be able to plug a pda into it.

 

You've got the right idea. For wide open throttle, anywhere from 13.0 - 13.5 is good for N/A applications. I definitely wouldn't go any lower or higher than these numbers for WOT, or you'll lose power. For cruising, I was able to get anywhere from 16 - low 17's while cruising. Mid throttle I kept it around 14 - 14.5

 

I had my safc/ wbo2 combo for over a year before I went the Megasquirt route. It worked pretty well.

 

^ interesting set-up in your sig. Do you have any dyno numbers with your NA turbo II intake set-up?

 

unfortunately, not yet. I'm putting in a 550/680 injector combo because my current 460/550 combo is maxed out at 157% duty cycle and although it breaks up real bad at that point, it pulls real hard. I also usually see 110 - 120 kpa map pressures (100 kpa being atmosphere) in my datalogs as well during WOT runs. So, I have yet to see how it really runs.

 

You, my friend, have never looked into the ITS mod.

My Rtek is SCCA legal. Looks just like a Stock ECU in a stock case. For only $50 more!

The Rtek is night and day comapred to a SAFC. Altering timing does wonders for the low-end. In fact, I don't have to downshift out of 5th to climb hills. But that's due to three things:

.756 5th gear
4.3 Ring & Piniong Gears
Rtek Timing