Has anyone thought of correcting the lean a/f ratio's caused by air intakes by using an ebay "adjustable" resistor? Thus extract more hp out of the intake???

eBay Motors: +25HP D-BOOST PERFORMANCE CHIP HONDA ELEMENT FIT PILOT (item 110168203368 end time Sep-15-07 19:51:18 PDT)

 

I bet that does a dandy on your gas mileage. It sounds like it just fools your ECU to run really rich.

 

Well, its adjustable, and intakes and header make the fit run lean, so why
not rich'en it up?

 

Please, do not purchase or install those ebay resistor mods. They WILL mess your car up.
Most intake manufacturers, including us, do some type of research and dyno tuning on their intakes. What most manufacturers shoot for is an optimization of the A/F ratio with stock ecu calibration. They tune their intake flow characteristics to make the air fuel ratio what they want it to be, be it 12:1, 11.5:1, 10.5:1 etc. The specific A/F target is dependant on the manufacturer and different for every engine. Some engines can run a certain A/F ratio at WOT and some will grenade at the same ratio.

Those Ebay resistors are made to modify the signal from different sensors. This is used to fake the ECU into either advancing timing and/or adding a little more fuel. This usually makes A/F ratio a little leaner which may, on a stock vehicle, produce more power.

But remember, being that the aftermarket intake already created a leaner more powerful intake charge. Putting a resistor on may push the A/F even leaned into detonation. Now this will destroy your engine quickly.

Remember over rich or over lean will cause a loss in power. Over rich will cause high EGT's and ultimately melt exhaust valves and cats. Over lean will cause high egt's and pre-ignition /detonation ultimately destroying the engine.

hope this info helps

James Liang
H-fit Team
R&D engineer
H-Fit.com....Products now available. Performance for track and street...
J Squared Advanced Development - Performance Automotive Engineering

 

Since when do Fits run lean with an intake? Fits run great AFR's after an intake. Its when you run a header with large primaries that the car will run lean.

 

aj-racing & injen dynos have afr's, that show it runs lean with intakes.

 

If you've been reading the recent articles in tuner maganzines, I'm sure you'll see the one on using the AFC Neo to correct your A/F ratio. I had a chip like that on my integra and have since learned my lesson. Our cars arent' like computers, you can't really "overclock" your car as easy as you can you desktop. Those chips will mess you up.

 

Lean makes more power ! lol

 

Theres an oxygen sensor in your car for a reason.

At WOT, however, it does not pay attention to this sensor, but an intake and exhaust are not going to make it run lean enough to cause damage. In general, cars run rich at WOT from the factory.

 

I see, I will stay away from those resistor mods!!

 

Ive had a CAI on my Fit for a while now. Even when my exhaust was basically stock I have never heard any detonation.

Also, the dynos Ive seen from J's have good AFR's with an intake. After the header and exhaust they get to around 13.5 AFR's at WOT. Its a little lean. Cruising around cars fluctuate from 13.5-15.5 AFR's. Well, my Mx-6 does.

 

Guys, your AF will change with mods. Thats for sure because after the intake and exhaust mods in... Import Tuner Power Pages... we can see there is a potential for more power with adjusting our fuel for the mods. At least 4 hp on top of our bolt-on's. I honestly dont remember how much exactly though.