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#1
10-03-2007, 02:22
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Setting the A/F ratio?
I'd like to set my air fuel ratio.
My mods: MK 1,5 Stock ECU management, stock injectors, K&N filter in box, 2.5" piping+ intercooler, polished head, cold spark plugs, T2 at 0.6 bar with MBC, 2,5" exhaust, 98 RON, Luk 13 clutch, 40 mm dropped etc... I have a digital A/R ratio gauge, idle 14.6, full throttle/full boost 10(can't read under...). i'd like to set up like 12.5/13 at full boost. What can I use? (cheaper to higher cost) Cheers. 
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#2
10-03-2007, 11:44
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Apexi SAFC-II, can't say much about it but i know there are several writeups for using them on the S12 CA18ET.
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Eventually you realize that your time can be better spent on more productive activities than beating your head against the wall arguing with density.
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#3
10-03-2007, 14:15
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#4
11-03-2007, 10:01
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Quote:
how are you running a air/fuel guage?
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#5
11-03-2007, 10:13
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I've got a a/f gauge:
 The best way to alter the fueling, is to remap the ECU. Alundra why don't you turn the boost up (if the turbo allows) and see if it reduces to say 11.5:1. The reason why they run so rich is because they are mapped without an intercooler ie they make it rich to run safe
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#7
11-03-2007, 11:52
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Im struggling with this right now as well. I have a dash mounted A/F gauge but it lies to me through the medium of flashy LEDs
 If you turn all the accessories in the car off then at idel it shows rich, but if you turn the lights and fans on then it nearly shows lean? is this strain on the engine via the alternator, or is it that the voltage supply to the meter should be regulated at 12v  Im thinking of visiting a tuner to see if they can get my car back nearer where it should be but the only adjustments would be the AFM, throttle bypass valve (idle) and the timing. Would this be enough to set teh car up better than current (it cant get much worse)Currently running about 20p per mile! or about 21mpg. I would really prefer 25mpg which would be about 17p per mile or a saving of £372 per year (so I can spend that much making the change and be no worse off. My bluebird turbo (same engine,heavier car, intercooled, more restrictive exhaust) was <14.5p per mile or 29mpg so it should be achievable.
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#8
11-03-2007, 12:59
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Quote:
that is a narrow band gauge running from a narrow band sensor (what are you using? the s12 doesn't have one as standard) they tell you nothing at all. sounds like you have a boost leak to me
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#9
11-03-2007, 13:20
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Quote:
I too suspect a boost leak and Im pointing the finger at the dump valve which I want to ditch.
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#10
11-03-2007, 15:17
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Ok, I have a S12 with 8 sparks plugs system and emission control AND a stock 02 sensor came with this car.
I have take the signal that come in ECU for my A/F gauge. At idle 14.40, 14.50, 14.60 with or without headlights electronics etc... I know the difference between narrow and wide band sensor but for me it's sufficent for ECU, the motor and the monitoring of it. I'd like to go at 0.8 bar or 1 bar but i prefer go safe because i need to know how make a detonation "gauge", i'm really scary about detonation in a car. For 10.00 ratio is too rich and rich is'nt good for pistons too, right? I'd like to remap but I have mk1 ECU as I said.... If you have any info on a mk1 remap I'll take it 
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Linear Mode
