My plans for supporting 400rwhp fuelwise are 1600cc/min secondaries, stock primaries, walbro high pressure pump, microtech lt8 and an aftermarket FPR. Will the Bosch boost compensating fuel pressure regulator work for my application?

 

bump

 

or if not which fpr will be suited for my application?

 

Don't get a rising-rate FPR. Get a linear-rate one.

 

linear, like an aeromotive?

 

GIve me an example of a linear fpr nz, I am looking at an aerpomotive one right now that has a line for boost, the more boost uyou run the more fuel it gives, I believe. Let me know, thanks for your help.

 

All FPR's do that, but a linear-rate FPR increases fuel pressure at a 1:1 ratio to manifold pressure (the stock FPR is linear-rate), while a rising-rate FPR increases fuel pressure at (for example) a 4:1 ratio to manifold pressure.

Any info you look at on a particular FPR should tell you whether it's linear-rate or rising-rate. You want a linear-rate one, not rising-rate. Any manufacturer who makes rising-rate FPR's will also make linear-rate ones too.

It you do a search you'll find lots of FPR info and recommendations, coz it's been covered many times.

 

ok perfect, thanks for your help....again nz

 

may I ask why a linear rate FPR is being recommended instead of a rising rate? What will be the result of using each item?

 

A rising-rate FPR increases the fuel pressure considerably over a linear-rate one. The idea is to squeeze more fuel through the stock injectors to prevent leaning out, because the injectors are too small to flow enough at normal pressure. This actually reduces the fuel pump's capacity because the higher the pressure the less flow the pump can provide, so you need a decent pump too. It's a pretty crude method, and if you want proper mixtures you still need a fuel controller. In that case you might as well just install the correct sized injectors for your requirements.

In this case (bigger injectors, bigger pump, EMS) a rising-rate FPR is totally unnecessary because these components will provide the required amount of fuel without increasing fuel pressure.