Setting the A/F ratio?

[alundra]

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.

[Maximilian]

Apexi SAFC-II, can't say much about it but i know there are several writeups for using them on the S12 CA18ET.

[alundra]

Thanks for reply:

Who test this?

http://www.hksusa.com/categories/?id=1920

[s12Rob]

Originally Posted by alundra

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.

how are you running a air/fuel guage?

[30psi]

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

[s12Rob]

how much did that kit set u back and is it for sale, lol

[Wocketfast]

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.

[sideways danny]

Originally Posted by Wocketfast

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.

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

[s13eater]

Originally Posted by 30psi

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

what make is that gauge mart.does it come with softwear.

[sideways danny]

it's a VEMS kit, you can get all the vems software free by download