S-AFC II - Fuel Consumption
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S-AFC II - Fuel Consumption
Hi, I've got an NA 1988 RX7, stock ECU. I'm considering the S-AFC II as the stock ECU runs very rich. If I got it tuned (could I DIY?), and leaned out so it runs optimally, would I have a noticeable decrease in fuel consumption?
thanks.
(P.S- I posted this in the SAFC area, but I don't think anyone goes on there!)
thanks.
(P.S- I posted this in the SAFC area, but I don't think anyone goes on there!)
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Well let me think, if you remove fuel to lean out the car, then i would say you would probably use less fuel...
Just playing, you will get better mileage on the highway, in town i didn't see much if any. But the butt dyno noticed a difference
Just playing, you will get better mileage on the highway, in town i didn't see much if any. But the butt dyno noticed a difference
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yep definitely would use a wideband O2 ITSWILL.
Let me think nvrdone, yes obviously it will use less fuel, but I'd like to know if it would make a significant difference or not?
What sort of ratio's did you have?
Let me think nvrdone, yes obviously it will use less fuel, but I'd like to know if it would make a significant difference or not?
What sort of ratio's did you have?
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#15
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you cannot tune an SAFC for low load driving with the factory narrowband signal going to the ECU. It will ignore the correction. If you disconnect the factory narrowband then I've been told the ECU will respond to SAFC correction under low load. I never bothered with that, but others have. You could lean it out to 16:1 under low load steady state cruising, which is where I run my car with a standalone.
You could remove the factory 1 wire narrowband sensor and just have your wideband. Then if your wideband has a 0-1v narrowband emulation wire you could splice that into the ECU. This is IMO pointless. If you want a narrowband signal going to the ECU, just use the stock sensor. It saves you trouble. You don't want a wideband in the stock bung, not if you value sensor life.
The general recommendation is 36" (or as far as you can manage and still be before the cat if you have one) from the exhaust ports or turbo, because of the heat of the rotary engine.
You could remove the factory 1 wire narrowband sensor and just have your wideband. Then if your wideband has a 0-1v narrowband emulation wire you could splice that into the ECU. This is IMO pointless. If you want a narrowband signal going to the ECU, just use the stock sensor. It saves you trouble. You don't want a wideband in the stock bung, not if you value sensor life.
The general recommendation is 36" (or as far as you can manage and still be before the cat if you have one) from the exhaust ports or turbo, because of the heat of the rotary engine.
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How much more? the SAFC adjusts every 500rpm, which would work out to 16 points. The RTEK does 14x14 for S4 and 18x14 for S5, with the same =/- 50% range.
And you don't get timing control, secondary injector control, VDI control (s5), etc.
I guess you wouldn't be able to tell people you had APEX'i parts on your car
someone should've told that to Honda before they put them in all the Civic VXs
And you don't get timing control, secondary injector control, VDI control (s5), etc.
I guess you wouldn't be able to tell people you had APEX'i parts on your car
someone should've told that to Honda before they put them in all the Civic VXs
Last edited by HotRodMex; 09-13-08 at 02:15 AM.
#22
well, i know this is odd... but my NA 88 GTU gets like 350 miles to a tank... but that's probably because my aux ports are driven closed all the time. its because the actuators were taken off before i bought the car.
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