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Thread: Fuel Pressure Regulator
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05-12-2021, 09:21 PM #15000 RPM
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Fuel Pressure Regulator
I have a fairly modified 225 promax powerhead (260 porting/145 compression) just setting it up. I am starting with a R32 ECU and a 39psi regulator but was thinking of bumping up to a 56psi regulator,has anyone tried this combination with success. Thank you
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05-12-2021, 10:18 PM #2Screaming And Flying!
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Try a adjustable regulator that way you can dial it in however you like.
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05-13-2021, 10:32 AM #3
That ECU is mapped for 39psi regulator so going to 56psi will just make it run rich. If you want to go 56psi you should get an ECU with a 56psi curve.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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05-13-2021, 11:21 AM #4
Yeah, you won't get performance gains, it will actually make your motor run horrible. You have to swap ECUs & regs together (or re-chip). If you have a feeling your ECU is a bit off because you did mods to the block then you can go to an adjustable and make little tweaks to the whole RPM range. You can add a couple psi and make it a little richer all around to compensate for the porting/increased flow.
I run one and love it!
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05-14-2021, 07:00 AM #55000 RPM
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On my modified 2.5 225, that R32 ecu burned a piston, and according to my pyrometers was too lean to stay in a safe temperature range. I’d go with an ACU from Brucato and a steam wheel. Even with an adjustable regulator I couldn’t get the temps down by increasing fuel pressure. This is just my personal experience.
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25two.stroke, pkstv liked this post
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05-14-2021, 01:05 PM #6
The stock R32 promax ecu will be too lean and not supply enough fuel for the porting done to the motor. I would look into a Powers for a Ecu.
1998 SS 2000 94 260ss
Speed cost how fast you want to go
Allison and Merc is there anything else?
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05-14-2021, 08:28 PM #7
I own a 225 promax with a 56 psi fuel regulator and a brucato ACU that’s got a 260 fuel curve mapped for 56 psi . You need to use the correct regulator psi that your ACU is programmed for .
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05-15-2021, 06:32 AM #8Bud Conner "Heathen" "Defending Our Constitution"
FOR ALL ENGINE APPLICATIONS
DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!
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Dave Strong, pkstv liked this post
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