S5 omp

[tweiss3]

Originally Posted by Pete_89T2

Are you certain it's the OMP is shot? I say that because the OMP is usually pretty reliable and because old/worn out OMP wiring harness issues are more likely and will also dump you into limp mode. The FSM has a few procedures to test the OMP itself and troubleshoot the system's wiring. Assuming you've done all that and verified that the OMP is indeed dead, your options are:

1. Pick up a used OMP & take your chances with it
2. Send out your ECU for the Rtek v2.x mod, which gives you the option of removing the OMP (don't forget to run premix!) and cancelling the limp mode, along with adding some fuel/spark tuning capability to the stock ECU, for about $450. If your mods are not too wild (<300 HP), and your stock wiring & sensors are in good shape, the Rtek isn't a bad investment.
3. Go with a stand-alone EMS, wiring harness & associated sensors as required.

I found a rebuilt for cheaper than new (about used price) but I don't have the cash right this second.

Originally Posted by RETed

It's s 4-pole stepper motor with feedback.
You'll need to fool the stock ECU into thinking that this is still the case.
You can easily fool the 4-pole stepper motor part with a bunch of matched resistors.
The hard part is to fool the feedback signal part.

With the prices of stand-alone EMS units coming down (under $1,000 in some cases easily), why bother messing with this?


-Ted

Thanks, for the replay, it makes a bunch of sense. What does the feedback signal look like? I'm curious now.

Anyways, I guess I have to weigh my options.

I could go standalone for less than the price of a new one from Mazda.
I could buy that reman unit.
I could make a simulator and delete it completely.

I already premix, just need to up the premix now and block it off.