Don't bash me if this is ridiculous, just thinking..

Is it possible to install a very light resistor on the wire that returns the MAF sensor readings to the ECU so that the ECU injects less fuel and you run a little leaner?

I'm no electrician but thought it would be nice if I could put a resistor that will shift all values with like 5 - 10%.

My car runs rich now and apparently I think too much about it now..

 

what in the world..













invest in a SAFC try not to rig something.

 

yea u can do it, its called an air fuel controller dude! dont be rigging something like that up, you'll end up regretting it big time. save urself 150bucks or even less, and get a basic air fuel controler

 

can anyone post a link to a good-value a/f controller?

a resistor would cost 10 cents still.. Just thinking.. If anyone could calculate what resistance the resistor should be I am willing to try it..

 

You must not understand. You cannot do that. no one here has any way of knowing wat resistor you should try, cuz no one here knows how rich your car is running, do you even have a wideband reading? do you know at what rpm you are running rich? if you put a resistor(if it even works), it will make it leaner at every rpm, even at rpms that need no change in air/fuel. just think about what ur trying to do, and read up on basic understanding how air fuel controllers work. you can adjust your air/fuel somewhat, by using a fuel pressure regulator, you have no control on what rpms to make it leaner, but its better than a resistor. you lower your fuel pressure so it runs leaner. done deal. afpr's cost like 50 bucks or so.

 

Just search SAFC on froogle. Now a good value (for the features) would be an EU, but that may be a hair outside your needs.

The only problem with your idea is (beyond the obvious, A/F is never a flat line across all RPMs and throttle positions so you won't have good corrections), if you miscalculate or are already somewhat line or right on stoich at one position, a leaner AFR may very well blow your motor. That's more so if you miscalculate and it get it very lean, though.

Also, do you know exactly how rich you are running? Do you have a wideband? The ECU will try (and, generally, succeed) to run right at 14.7 in closed loop, and you want to run it leaner?

 

Are your O2 sensors bad?

 

Lowering fuel pressure would do the same as the resistor, in practice. It would run leaner across the board.

 

I stated that "you have no control on what rpms to make it leaner"

 

If you are running 87 or 89 octane, try using 91 octane. When the KS detects pre-ignition, ECU will enrich the fuel mixture and retard timing. People reported much better mileage on the freeway with premium.

 

Skip a couple lunches and get the AFC....

 

I bet this is one of the first thoughts that Apex'i that came to mind long, long ago.

 

My car has never seen lower than premium gas.

What kind of lunch are you having that you can buy AFC if you skip a couple? Those SAFC2s are all over 200$. And for what? Just to adjust the AF under WOT? Although it will look cool at night under my head unit.. I have an empty space now. Are those apexi safc2 single din in size?

 

Sorry I guess I meant don't be a cheap *** but didn't come right out and say it. You think it makes sense to use a resister, then use it. Post up results (dyno). You could also slice up your MAF and put the element in different sized piping based on calculations.