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Help With Nismo Fpr On Rb20det

ashr32

By ashr32,
in Engines & Forced Induction

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ashr32 Rising Star

ashr32

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Hi guys,

ok so on the weekend I installed a Nismo FPR on my r32. I have attached an image of how I installed it. I already had a fuel pressure gauge installed so I know what the old regulator was doing.

So anyway I turned the key on to prime the pump and it goes up to 50psi. I then start the car and it goes down to 40psi and sits there at idle.

Now here is the issue. With the standard reg when I accelerate the pressure increases as the manifold pressure does but with the nismo reg as soon as I tap the peddle pressure goes straight up to 60psi and holds there for a second or 2 then goes back to 40psi at idle. It's not linear like before. I've played with the adjustment screw but that's only for the initial pressure setting.

I took it for a drive and its fine but as soon I accelerate to goes to 60psi and when I WOT it trails from 60psi to 58, 57, 56.

So is this normal? I thought that because it has a vac line it would be linear?

Any ideas guys?

Extra info

I've got an aftermarket GTR pump

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https://www.sau.com.au/forums/topic/233523-help-with-nismo-fpr-on-rb20det/
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ashr32 Rising Star

ashr32

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hey no problems

rb20det

rb25 s2 turbo 14psi

HKS CAM Gears

Full 3" kakimoto

profec b spec 2

Apexi POD

GTR Injectors going in this week

PFC going in this week

greddy m spec intercooled

ashr32 Rising Star

ashr32

Posted
  • Author
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so basically im setting it up for 190 - 200kw atw but very strong through the rev range

last dyno result with the follow mods

rb20det

rb25 s2 turbo 12psi

Full 3" kakimoto

profec b spec 2

Apexi POD

greddy m spec intercooled

179kwatw

ashr32 Rising Star

ashr32

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  • Author
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If you are only after 200rwkw, then the stock injectors will be fine with the stock reg. It sounds like the pressure is set a bit high, and the pump is on its last legs.

i hit 85% injector duty cycle on the dyno so i thought why not give them some overhead.

like i said i want a strong 200kw. the pump is only 10 months old so i hope its not that

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