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1st, you do NOT want to be messing with the stop screw. This will screw up your TPS adjustment, which can cause worse idle problems. If you adjust the butterfly open, you can lose the idle signal from the TPS, so the ecu doesn't know it's supposed to be controlling idle. This could cause a...

The brakes are vacuum driven, so you can see small fluctuations in idle in almost any car if you sit at a light and pump the brakes. Should never be enough to actually cause an issue, just maybe noticeable if you try to make it happen.

There aren't any other differences other than the ecu and exhaust. I'm running an exhaust at least as large as the mp3 piece, so that's not it. Take a look at the fuel pressures as I suggested. What do you mean that your ps "pulls" the car? You lost me on that one. Big Ben, we use a check valve...

What you want to make sure is that the additional fpr isn't adding fuel at idle. Stock fuel pressure should be 39-45 psi. 1st mp3, remember that every electrical load translates into more hp required to drive the alternator. Also, the a/c isn't so much an electrical load as it is a parasitic...

If you're seeing idle problems, first thing I'd look at would be fuel pressure. You may want to replumb your fuel pressure gauge so that it's in the feed line to the rail, not in the line between stock and Bell fprs. Too much fuel pressure at idle will definitely cause stalling. Our P5 has never...

Omar, Thanks for the kind words. As an FYI, the Protege's do have a return line on the fuel rail, making it easy for us. Not sure why the Protege uses a return system and the Miatas returnless...

Whew! That'll be much safer.

Linux, that's a pretty scary combo, boost on top of 10.5/1 compression with an mp3 ecu that bumps timing. 93 octane *might* save you, but I wouldn't count on running much boost.

You can only go so far on the injectors with a stock ecu before you run out of the range of the ecu and 02 sensor.

If it is supported like the rest of Greddy's stuff it probably wouldn't matter how good it is. I've never seen one, so can't comment on the product itself.

Stou, You read wrong. All recent Proteges have knock sensors. Having access to 94 octane fuel is helping you a lot. We need to design our kits to run on the crap that the majority of the country gets, which is now 91 octane. The reason you can get away with stock pump is that you are running...