I just installed a 3" dp/mp and catback and M2 stage # ecu and running about 14 a/f ratio I think that is kinda high at WOT. I only drove once like that so that I don't risk blowing a seal. Is that to high to be safe or is that ok? I think the fuel filter maybe restricting fuel flow. I bought the car about 600 miles back w/ 84k. Have a feelling the fuel filter is original so I order a new one. Does anyone have any other ideas that may help me? I have a boost gauge and apexi timer w/ a/f meter. no other mods.

Thanks,
Chris

 

Those A/F ratio gauges are pretty much better served lighting up a Christmas tree than telling you anything about what's going on in your car. That said, go ahead and be safe and smart and just replace the fuel filter since you have no idea when it was last replaced.

 

Would a new O2 sensor change readings from what I had before the install also? I installed a new bosch o2 sensor in the DP.

 

14 is way too high for a turbo car much less a rotary. You should be shooting for a 11:1 to be safe. 12:1 if you want more power but your nearly on the edge! Anyways, how do you know your at 14:1? The only real way to find this out is by using a lambda meter! You can rent one when you dyno your car.

Good luck

 

What skunks said and its always a good idea to change your fuel filter pretty regular. Stock fuel filter has pretty good flow for most moderately modded cars. You can go with a K&N filter if you want more.

 

What did you use to read your O2?
Anything using the stock sensor is about as good as a rumor, nothing to bet on.

 

You should change your fuel filter just to be safe. Fuel filter is cheaper than a blown motor.

 

I got the a/f readings from my Apex Turbo Timer w/ A/F meter which from what I hear so by no means near acurate. I am planning to take to dyno next week once I get my fuel filter in and tight up the exhaust I think I have a small leak. The exhaust smalls rich by the way.

 

I also but a new Bosch O2 sensor in at the same time as the exhaust and the M2 ECU. I was did doing some reading and it sounds like different brand o2 sensors will give different voltage readings. Is that true?

 

only a lambda meter can tell you what your true A/F ratio is, if you do a search, you will find that regular O2 sensors can't distinguish fine detail, in the higher temp ranges where you need it. It does not matter what O2 sensor you get.

 

Thanks I am finding out if my local shop has the lambda meter to use with there dyno.

 

Not sure if this makes sence I was driveing last night home and look at my a/f meter and it is showing very rich light acceleration 12.xx so I so I decide to go WOT and it dips to low to mid 10's. Only thing I could think of is that the new O2 sensor had some kind of coating that needed to get burned off. I am still going to the dyno on tuesday to find out for sure.