fmic, leaner? richer? - Drifting forum

drift_johnathan · 24-06-2008, 11:17

Does putting a fmic on the car instead of the side mount, make it run richer or leaner. Ive been told different things by different people. And as my car is running lean I kept it off thinking it would be worse, but now told put it on. Ive got other bits like high flow fuel filter etc to sort out fueling, but does anyone know for deffinate which was it will go

Cheers guys

Stavros · 24-06-2008, 11:21

If its running lean you shouldnt drive it.

And a decent IC would make it run leaner as the air is denser, BUT as the charge temps are much cooler it would be much less suceptible to det at any given air/fuel ratio.

So its swings and roundabouts really.

BUT usually a FMIC would make it less likely to det rather than more, which is much more important than the actual AFR. So its a good thing.

But still wouldnt be driving hard it if its running lean.

drift_johnathan · 24-06-2008, 11:40

it off road atm anyways, alternator gone, but ive been driving like a grandad anyways while it running lean, well after i found out, and its not everyday car anyways. just getting things, so when it back on road can test it again

steve_fctuning · 25-06-2008, 15:25

may not change anything if its running a stock ecu as they run on the rich side, providing everything else on the car is tip top. could make it run leaner though.

You can still drive it, just avoid blatting it about everywhere mate

drift_johnathan · 26-06-2008, 10:53

well when alternator is fixed, ill be changing the filter, and hope thats all it is really that making it run lean. ill get it re checked, and then when its right put the fmic on then.

cheers guys.

24-06-2008, 11:17	#1 (permalink)
drift_johnathan spl dori master Join Date: Mar 2006 Location: stockport, manchester Posts: 354	fmic, leaner? richer? Does putting a fmic on the car instead of the side mount, make it run richer or leaner. Ive been told different things by different people. And as my car is running lean I kept it off thinking it would be worse, but now told put it on. Ive got other bits like high flow fuel filter etc to sort out fueling, but does anyone know for deffinate which was it will go Cheers guys

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24-06-2008, 11:21	#2 (permalink)
Stavros DEYTUKURJURBS Join Date: May 2005 Location: Cheltenham, Gloucestershire Posts: 9,543	If its running lean you shouldnt drive it. And a decent IC would make it run leaner as the air is denser, BUT as the charge temps are much cooler it would be much less suceptible to det at any given air/fuel ratio. So its swings and roundabouts really. BUT usually a FMIC would make it less likely to det rather than more, which is much more important than the actual AFR. So its a good thing. But still wouldnt be driving hard it if its running lean.

24-06-2008, 11:40	#3 (permalink)
drift_johnathan spl dori master Join Date: Mar 2006 Location: stockport, manchester Posts: 354	it off road atm anyways, alternator gone, but ive been driving like a grandad anyways while it running lean, well after i found out, and its not everyday car anyways. just getting things, so when it back on road can test it again

25-06-2008, 15:25	#4 (permalink)
steve_fctuning touge runner Join Date: May 2007 Location: London Posts: 168	may not change anything if its running a stock ecu as they run on the rich side, providing everything else on the car is tip top. could make it run leaner though. You can still drive it, just avoid blatting it about everywhere mate

26-06-2008, 10:53	#5 (permalink)
drift_johnathan spl dori master Join Date: Mar 2006 Location: stockport, manchester Posts: 354	well when alternator is fixed, ill be changing the filter, and hope thats all it is really that making it run lean. ill get it re checked, and then when its right put the fmic on then. cheers guys.