BDC

I wonder why their regulator kit still sells the two front washers...



B

silverrotor

I'll soon findout...and add to this. Now I'm confused.

Drago86

id like to know this as well, i was planning on running an FD rear regulator with the stock s4 NA front...

DuMaurier 7

I purchased and installed the Racing reg. from MAZDATRIX that raises the pressure to 110 - 115 psi , it came with a pair of small washer like shims for the front reg . , the instructions explained that this was necessary to "balance " the oil pressures at the front and rear regs.

mazdaspeed7

Who do you trust more? Racing Beat or Mazda? The FSM clearly stated 156 PSI is the bypass point for the front oil pressure regulator.

7mech

Better safe than sorry. DuMaurier7 are your oil pressures where they should be?

turborotor

I ain't an expert but the oil pressure rigth after the pump at the front regulator will be higher than the oil pressure at the rear of the engine, thus needing the oil by pass to be higher in the front.



I competely look at this like it was a fuel pressure system. If you raise the fuel pressure on the fuel regulator at the end rail, lets say from 38 to 43 or more. The fuel coming out of the fuel pump will raise from let's say 85psi to over 100 psi. That just my assumption.



So if you go from the stock oil regulator to a racing beat 85psi one then the front regulator might reach sooner its by pass pressure sooner and the oil pressure will not be stabilzed, as each end is fight to balance a good load. Thus needing the washer to raise the by pass pressure in the front regulator.



Does this make sense to anyone, just my vision.





C

7mech

Yes it makes alot of sense. Basically if the rear pressure is raised then the front regulator will reach its bypass pressure sooner thus needing to be shimmed.

mazdaspeed7

Too bad its wrong. There are 2 oil paths after the front OPR. The first one goes to the front cover and to the oil cooler, back to the rear iron, to the rear OPR, to the oil filter, and then to the rear stationary gear. The second one goes through the front iron up to the dowel pin, where the turbo oil feed is on turbo cars, through the dowel pin on all, and to the oil passage in the rear housing that feeds the rear OPR and the oil filter. The more of a restriction the oil cooler poses, the less oil that flows through it. If your oil cooler clogs, and completely stops the flow, you will still have oil pressure at all engine bearings.

Jeff20B

Dave Atkins reccomends shimming the front pressure reg when doing a supercharger. He says it helps balance it out. I trust his info and shimmed front and rear regs with the same amount of washers (3.7mm). The rear should be good for 85-90PSI.