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Old 10th August 2011, 08:55 PM   #1 (permalink)
Jez200 is BMW Powered!
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What FPR for 450hp RB25?

Hi guys,
What would be the best Fuel pressure regulator for my RB25? Main mods are GT3040R turbo, 100mm intake and aftermarket twin feed plenum, 630cc injectors, Bosch 044 fuel pump.

Thanks!
Jez
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Old 10th August 2011, 11:19 PM   #2 (permalink)
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I ran a stock FPR on my 400whp R33 GTS25t
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Old 10th August 2011, 11:41 PM   #3 (permalink)
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Stock rail and FPR should be fine with the right injectors. OE FPR's are usually far more reliable than el cheapo aftermarket stuff. If you NEED an adjustable reg' Bosch Motorsport ones are about as good as they come.
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Old 11th August 2011, 05:09 PM   #4 (permalink)
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I am running a standard one on my rb25 with a hks gt3037
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Old 11th August 2011, 06:59 PM   #5 (permalink)
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Im not running the std. fuel rail anymore. Its a twin feed setup, see here:
sparksandfuel004.jpg picture by Jez_RB - Photobucket

Currently have an FSE jobbie on but i dont think its up to the job..
Power Boost Valve

Looking at ordering this Sytec one. Sytec Competition Adjustable Fuel Pressure Regulator | Fuel Pressure Regulators | Fuel System | Motorsport Shop | Demon Tweeks
Got good reviews and the 1:1 ratio that i was recommended by tuners.
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Old 11th August 2011, 09:23 PM   #6 (permalink)
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Those FSE powerboost valves are total and under shite. I ran one on mine and thought it was doing ok until I had a proper look at the fuelling, pressure was all over the place.

And I'm not the only one who has had problems with them.

Replace mine with a Nismo adjustable one as I no longer had a stock one handy.
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Old 13th August 2011, 04:41 PM   #7 (permalink)
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I run a Nismo one on mine with sard 555cc injectors.
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Old 14th August 2011, 07:13 PM   #8 (permalink)
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Nismo, Tomei or Sard will be fine, prob even stock
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