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Location: Burlington, Wisconsin
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RRFPR question

I have 30 lb injectors in my car right now running 3 bar fuel pressure . The car run great but I would like to bump the boost levels up to .7 bar from my current.4 bar.. Will a rising rate fuel pressure regulator allow my injectors to stay in for good idle but allow for more up top where I am closing in at 100% duty cycle now.. or do I need to 42lb injectors? My current fuel pressure regulator is rising rate to a point but does not have as much adjustablity as one of the begi's which I think would be the way to go..

TIM T? Or anybody else with experience please ?
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Ben

Current project 73 914-6 Gt project rusteration 2.4
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Old 01-13-2008, 05:29 AM
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Ben, are you running the OEM 3.2 Carrera injectors? If so, they will safely operate at 0.7bar boost with a RRFPR. I ran OEM units for many years @ 0.7bar without any issues. I used a Proto RRFPR though, however, they will be fine with any adjustable RRFPR.
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Merv
'89 911 Turbo Cab
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Old 01-13-2008, 02:30 PM
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Quote:
Originally Posted by WydRyd View Post
Ben, are you running the OEM 3.2 Carrera injectors? If so, they will safely operate at 0.7bar boost with a RRFPR. I ran OEM units for many years @ 0.7bar without any issues. I used a Proto RRFPR though, however, they will be fine with any adjustable RRFPR.

I think carrera are 37lb but maybe I am wrong and they are 26lb anyhow I am running 30lb ford mustang injectors
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Ben

Current project 73 914-6 Gt project rusteration 2.4
914-6werkshop.com ,heat exchangers, oil tanks, etc
Old 01-14-2008, 04:36 AM
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carreras are 26 or 27 I forget which. I think you'd be fine based on what others are doing.

Someone set up a dyno in town, we're working on some time, I think this week
the 1400 mile gt3 trip was fun. I think we did it in around 20 hours all in.

Last edited by jbrinkley; 01-14-2008 at 06:38 AM..
Old 01-14-2008, 06:32 AM
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Originally Posted by jbrinkley View Post
carreras are 26 or 27 I forget which. I think you'd be fine based on what others are doing.

Someone set up a dyno in town, we're working on some time, I think this week
the 1400 mile gt3 trip was fun. I think we did it in around 20 hours all in.

any tires left on it? you have a begi right?
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Ben

Current project 73 914-6 Gt project rusteration 2.4
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Old 01-14-2008, 07:43 AM
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I think carrera are 37lb but maybe I am wrong and they are 26lb anyhow I am running 30lb ford mustang injectors
You'll be fine. The RRFPR essentially runs the fuel pressure at a higher rate, effectively driving your injectors harder @ a higher duty cycle to support higher power levels. Proto have been doing that for years. I run 37lb 944t injectors in my stage3 build and they'll support ~600HP+ with the Proto RRFPR and ECU cal.

You can fine tune the fuelressure ratio with an adjustable RRFPR (like a BEGi) to get best A/F ratio etc...
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 01-14-2008, 02:59 PM
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