Quote:
Originally Posted by CJMR2T
Yeah, they all pretty much work the same way. Like Mrturrari said, they are a very basic / simple mechanical device.
Basically they are just a cone and seat with a rubber diaphram and a calibrated spring. The spring is calibrated to the base pressure (no vacuum or boost, just atmosperic pressure..... It takes X amount of pressure to force the cone off the seat (based on the spring pressure. If you apply vacuum to the top side of the diaphram, you now have both fuel pressure and vacuum working to over come the spring pressure thus lowering fuel pressure. If you apply boost (air pressure) to the diaphram, then you have the spring pressure and the air pressure working together to try to close force the cone into the seat thus rising fuel pressure.....
If you have an adjustable unit, all the adjuster does is raises or lower the preload on the spring thus raising or lowering the spring pressure and therefor the fuel pressure....
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A guy at our club HAD a RB20DE + T skyline and he needed an adjustable FPR but couldn't afford one so he just beat the stock FPR with a hammer to increase spring tension.........it explodered that same day
For some reason that post reminded me of that incident