XKALIE

I was just searching the web, and decided to go to preludecrazy.com. There I found a site under 4th gen, that had a guy that said Quote" I pull the vacuum line off the fuel pressure regulator. It is located on the fuel rail and has "NR1" written on it. This allows the engine to richen up the A/F mixture slightly. Honda motors tend to run leaner when an intake, header, and exhaust is added. This helps compensate for this. I also plug up the vacuum line with a screw to make the car idle right. It will idle a bit strangely if the line is left open". Is this a good thing to do? Would it make such a difference, or maybe even effect something in a bad way?

red92si

Preludes actually tend to run rich... I wouldnt suggest just pulling the vaccuum tube. If you want to be able to adjust your fuel pressure, buy an adjustable regulator and a gauge.

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Tyler