Couple questions..how reliable are the factory regulators? Can they fail so they don't give consistent fuel pressure at wot?

How easy to install are the aftermarket regulators that convert the stock ones to adjustable?Do you have to do much hacking or what?

And lastly what is a good bolt on that replaces the factory?

 

I think the majority consensus is that adjustbable fuel regulators arent worth it on these cars. The reason being is that after a short period your computer will adjust for the extra pressure and lower it back down to factory settings.

 

A benefit of an aftermarket regulator is more precise pressure regulation without "chatter" that is fairly common amongst some factory regulators. The aftermarket regulator is normally designed to be able to flow more fuel to cope with higher volume fuel pumps when demand is low and still maintain your set pressure.

Another "benefit" is the capability tp adjust pressure lower/higher than factory spec to modify your injectors fuel flow. The ECU will compensate for modified pressure by adjusting pulse width to maintain stoich during part throttle operation.

Here lies my question: A narrow band 02 is inaccurate at best when it deviates away from stoich. I have read many posts where it has been mentioned that the computer will readjust its calibration back to the stock "map" after pressure is adjusted. How does the ecu know what to do under richer WOT conditions when its feedback would be based upon the information provoded by a narrow band 02 sensor? I can see where the computer could apply a percentage change across the map to readjust for new injector volume. What I do not yet know is how would this apply to WOT operating conditions.

Any feedback on this is much appreciated. I hope that this is relevant to the thread.