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has any one used a raising rate reg (FMU) on a CIS turbo

i'm running too lean on top,13.6 afr . My tech suggested that I install a FMU from BEGI or from Vortex, it's a adjustable raising rate fuel reg, Saturday my tech and I installed it on the fuel return line just after the accumulator junction and a vacuum line into the brake vacuum line, Put the car on the dyno and did not work !!. what was suppose to happen is when the FMU see's boost it close's the adjustable diafram , which closes some of the return fuel, that should raise the fuel pressure , but it didn't work .

Why , well I think it should be installed before the fuel accumulator junction not after or it won't build pressure, that Next .

Has any one ever in stalled one of these units? I need some help with this.

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1986 944 turbo -first car
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Old 11-20-2011, 06:59 PM
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Looks like you have some fuel system mods.
Do you have a higher flow fuel head? What system pressure are you running?
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Old 11-21-2011, 05:00 AM
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have not checked my system pressure , I installed a new WUR, a euro 112, and left it at that,
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-21-2011, 06:06 AM
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Old 11-21-2011, 06:24 AM
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In your other thread , you mentionned that you have some pending trouble with your pump voltage.

You should solve this problem first.

I am not sure to understand correctly your setup with FMU.

But something, if the pumps are too weak ( due to low voltage), the original fuel regulator (inside the head) doesn't open at all ( on WOT) and doesn't return any fuel to the tank. Thus, if there is no fuel inside the fuel return line (On WOT) , your FMU can not modulate and change anything.
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Old 11-21-2011, 06:25 AM
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thanks Thierry, your posts have been very helpful
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1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 11-23-2011, 12:57 PM
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Did you ever get Begi to work? I'm having a very similar issue with the AFR on 13 when boost comes on and would like to know if the Begi would work with CIS. How did you solve your problem?

Cheers
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Last edited by gavinc69; 04-21-2013 at 12:28 PM..
Old 04-21-2013, 12:19 PM
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Isn't that kinda the opposite of what you want with a CIS system? You want something that will lower...not raise...the fuel pressure on boost. Lower fuel pressure (I'm talking control pressure) will allow the metering arm to move farther, thus opening up the fuel delivery ports in the fuel head and injecting more fuel.
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Old 04-21-2013, 02:35 PM
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Works the same way as shimming the return regulator on the fuel distributor for more fuel at max delivery.

Increasing system pressure (not control pressure) increases the potential fuel pressure at the injector.

The raising rate reg would be installed on the return line from the Fuel Distributor.

For this to work the fuel pump/s must be able to deliver and operate at the higher system pressure.

Trick rarely used on 930's so you probably will not find may clues here. Comes from other turbo'd CIS cars.

Also, ultra high system pressure ( along with modified metering cones, mod fuel distributors, and larger injectors) were used by some like Volvo and Porsche on some of the old Group B turbo cars.

Still, it has potential for someone that is willing to go down that road.

Before running out and installing a reg I would test if shimming the fuel distributor (system pressure) gets more fuel. If not then the raising rate is not going to help. Possibly because the fuel pump/s are not able.

Last edited by 911st; 05-05-2013 at 02:11 PM..
Old 05-05-2013, 01:57 PM
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I think that is what is being done here.

Old 05-05-2013, 02:03 PM
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Hey Keith, it's nice to see you posting again.
It's been a while, hope you're doing well. I always like reading what you have to say here.
Jim
Old 05-05-2013, 03:56 PM
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i would not think it would work.

raising system pressure also raises control pressure which leans it out and would counter act any changes in system pressure..

why not just get an adjustable WUR and lower your control pressure under boost?
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Old 05-06-2013, 02:20 AM
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I ended up trying a 930 WUR and that seems to work fine, gives extra fuel on boost and works just like the standard SC WUR otherwise.

Thanks

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1980 SC Flatnose, Euro 3.0, LW Flywheel, 993 Cams, Port & Polish Heads, RS Cut Valves, Magnacor Leads, Boxster Brakes, WEVO Mounts, TRG Roll Bars, Rollcage, RSR rear fenders, WEVO Shifter, K27 7200 Turbo, OBX Headers, Tial Wastegate, Omex 710 ECU, 3.2 Intake, Full Bay Intercooler.....400HP
Old 05-06-2013, 06:13 AM
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