there's two chips that i know of, the torquechip and proecm powerchip. go here for details: http://www.imprezars.com/electronics...roecmpowerchip

 

From the forums and from what I have read, people have better results with proECM chip. The torque chip also works but the dyno seems to show no improvements, although I heard of people shaving off half a sec off their quarter mile so it doesn't seem to be just 'sneak oil'. Like I said, they are both good but proECM seems to be in preference.

 

i dont recall ever seeing any comments about the torquechip. i think you should be skeptical of any claimed dyno proven gains but im really skeptical of the torquechip's claimed 12 ft-lb improvement. i think if i was to get one it would be the pro ecm just because most people seem to be happy with it although it seems like most people say there arent many gains from it.

 

you dont have to do anything like that but a lot of people reset their ecu after getting them. im not positive of how to do it though.

 

yeah, thats pretty much what ive heard. i think the key is to leave the battery unhooked while you let the engine cool down so that when you hook the battery back up the ecu has to go through its cold start cycle.

 

Most folks can get an ECU reset by disconnecting the neg batt cable, hitting the brake pedal (in case of a little residual charge) and waiting about 15-30 minutes. The post mentioning the cool down period is interesting in that the car MAY need to see 2-3 drive cycles (basically warmup till the fans come on and cool down till the thermostat closes) to begin closed loop adaptive mode. It;s a good idea to do this after any engine-type mod or repair work. Some folks say there is a fuse that will reset the ECU if you pull it. anyone?

 

Well. if you force the cel light on - say by leaving the gas cap loose, you'll know the ECU was reset if the light is off after the procedure. If this is something you plan to do a lot, perhaps you should investigate getting an OBDII scanner.