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.

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

Thanks for reply:

Who test this?

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

how are you running a air/fuel guage?

I've got a a/f gauge:

http://img.photobucket.com/albums/v2.../DSCN1145s.jpg

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

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

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 :trout 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 :confused:

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 :confused: (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

It came on the car (Northerners old s12) so I have no idea what brand it is, but yup it doesnt tell you much.

I too suspect a boost leak and Im pointing the finger at the dump valve which I want to ditch.

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 ;)

What gauge have you got Alundra?

S12rob - Sorry its for my car

Swoosh ART one ;)

http://www.jdm-per4mance.com/product...roducts_id/134

So what lamda sensor does it run off?

If you are using a stock narrow band one it will only show 15.2-14.2:1

Event at full throttle, with boost?

No air or oil leak.

No Check ECU.

That's why i'd like something for running stoechiometric in full throttle+boost but solutions are hard to find.

Thanks 30psi ;)

I'm confused.

That gauge you have won't show the boost ratio's because its not a wideband lamda unit.

Why you said "wan't show"?

It's the same that you can see in the shop: http://www.jdm-per4mance.com/product...roducts_id/134

You can see the description on it.

I'll take a video to see what i said.

NO, wideband isn't needed for this meter, Yes i have a stock lambda sensor on my car; I'll some pics :nod

So you don't have lambda sensor on s12 from UK.

If it dont have a wideband lambda its almost useless.

What does it show on boost?

As I said, 14.4 14.5 area at idle go to 10 at full throttle.

Don't remember that car which have lambda sensor narrow are sufficent for stock engine management specially with MAF, it isn't so useless like our security dump security valve.

I'll take a video ;)

a narrow band sensor works completely different to a wideband. your gauge is lying to you

Alundra, what the guys are say is that the stock lambda sensor will be fine for you ECU and general running of the car, but when connected to the A/F meter it will give you a false reading.

you prolly are getting a reading on the gauge of 10 on boost, but that figure will be false.

Ok! Thanks sideways
But I don't know why?
So added oil gauges are false too?
I don't know the term in electronic in english but the A/F meter was fitted "en parallèle" not "en série".
That means it can't perturb the reading of ECU of the lambda.
So video is useless.

P.S: Finally if I understood! Be reading some stuff on net narrow sensor is useless for monitoring! Perhaps i run stoechio or lean and i don't see it!!! Sorry guys i misundertood you, to be clear adding gauge on a narrow sensor only show you that your ECU adding or not some fuel, but you can't see if the mix after it is stoechio or not.

Wideband sensor + gauge for reading it is very expensive!

Can a wideband sensor can be fit on a narrow sensor gauge?

So SAFC without wideband is useless...

Back from the start of topic: Anyone have a gauge for detonation monitoring on our car?

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

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