I am running an M2 Stage 3 ECU and was wondering if I could use a wide band 02 to monitor the A/F ratios while raising boost. People have said that I can't run more than 12-13 lbs. of boost but the car seems to run extremely rich. I figure so long as the A/F ratios are below 11 I can continue to run more boost. Is this correct? If I found the A/F ratios to be below 11 at 14-15 lbs of boost would that work okay? Also is there a slightly larger injector that i could swap with the stock secondaries to continue to use the M2 ECU in order to run more boost?

Or am I just going to have to step up to the PowerFC?

Would really appreciate some technical information regarding the M2 ECU

 

If you want/need larger injectors, you either need a separate injector controller or a programmable ECU like the PFC or Haltech.

There is no reason you can't run more boost on the M2 ECU *IF* you have the proper A/F ratio to do it.

 

Who makes a good working separate injector controller that would work with my setup?

 

The most popular one that I've heard of is the HKS AIC.

Keep in mind that's for "ADDING" injectors, not using larger ones. For using larger ones, you need some programmable fuel managment (or piggyback ECU).

 

I ran my car at 14psi w/ an M2 Stage 3 ECU and all the bolt-ons. I was also not too worried about blowing my motor because I was already planning to get it rebuilt due to some other problems.

Get it on a dyno an slowly turn up the boost. They are supposed to be tuned very conservatively.

 

Okay I have a question here... How can the car run rich at these boost levels with the stock injectors and fuel pump? I've read all over that neither can handle anything past 12 psi...

 

Another myth.

 

It's not that "they can't handle" those boost levels. It's more that the stock fuel system starts to get strained delivering the correct fuel ratios past 12-13 psi. Thus, it's recommended that you upgrade the fuel system once over that threshold.

 

Pshhh well I run so damn rich ... I think the reason my idle is set for 1200 is because it can't really go lower (even at 1200 it gives off little putts like mad... constant thuds comin from exhaust)

I backfire everytime i downshift over 5k rpms, and over 3k rpms when the car isnt warmd up... I have the stock ECU... but is it possible that I run rich enough for it to be safe at 12 psi? I'm not going to count on it ... I'm going PFC ^_^

 

Unless you have a wideband, you really don't know how rich the car is running. The stock ECU and rechipped ECU's are generally fairly rich in the lower rpms. However, if you are on the stock ECU and have a fairly good size streetport (which I believe you do), that probably accounts for most of your idling problems.