RB25 GTST OEM FPR flow capacity?

[Torques]

Hello,

What HP does the standard FPR  support?
 (fuel pump is upgraded)

 

Thanks

Edited December 27, 2016 by Torques

[KiwiRS4T]

At least 320AWKW probably quite a bit more.

[Torques]

Thanks ...

[TiTAN]

I had 400kw with the stock reg and rail.

It's at idle/low load etc that the reg is going to give you issues if at all, as that's when it has to bypass the most fuel flow and when it's working the hardest. It shouldn't be bypassing much at high load as the engine is using it.

[Dose Pipe Sutututu]

And if you ever put a fuel pressure sensor and monitor the oem fuel pressure I reckon it's going to be all over the shop with larger fuel systems... you'll run into fuel pulsation issues 

[vxsr33]

I put my stock reg back on today and immediately the fuel pump made a horrible squealing noise on startup and while running. The car idles like crap and stalled.

So I put my tomei reg back on and the car started up and idled normally with no abnormal fuel pump noise.

I have 1000cc injectors with a aeroflow topfeed rail on a r33 gtst. So im guessing the stock reg can't cope well at idle?

[GTSBoy]

Bypass orifice is too small.

[Torques]

What kind of fuel pump are you using? Also what ECU?

[vxsr33]

Walbro 255 and power fc. Car needs to be tuned though

[Torques]

On 09/01/2017 at 8:27 AM, TiTAN said:

I had 400kw with the stock reg and rail.

It's at idle/low load etc that the reg is going to give you issues if at all, as that's when it has to bypass the most fuel flow and when it's working the hardest. It shouldn't be bypassing much at high load as the engine is using it.

OK, thanks for that.

It must depend on the fuel pump that is how much pressure/flow they build up.

Also the standard R33 has a fuel pump controller in the back/boot. It drops the fuel pump voltage at idle and low load.

Most after-market ECU's don't handle the fuel pump controller right, so the pump always runs at full voltage.