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DSPTurtle's Avatar
 
Join Date: Jul 2001
Location: Suntree, Florida, USA
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Do Over... CIS Pressures

After I got him started and running fine, he resorted back to his old ways. Here are the pressures with the 930 spec pumps installed...
Ambient Temp 84F/27C
System Pressure 6 Bar (88PSI)
Cold Control Pressure 3.5 Bar (50PSI)
Warm Control Pressure 4.65 Bar (68PSI)

It seems like the WUR is doing its job by raising the control pressure by 1 Bar from cold to hot. Is there another spot where fuel flow could be limited, thereby increasing the pressure well beyond the spec?

I cleaned the plunger and blew air through the return line... everything seems okay but these pressures are completely wrong.

As always, any and all help is appreciated!!!
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Last edited by DSPTurtle; 09-13-2011 at 05:06 PM..
Old 09-13-2011, 05:00 PM
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So I priced a WUR rebuild... yeah right. Not until after I at least give it a try. So I pulled the WUR apart (careful, there is a spring in there), blew out the screen with very low pressure. Sprayed carb cleaner through the ports... a little more air, then screwed it back together.
System Pressure - 6Bar (88 PSI)
Cold Control Pressure - 1.8 Bar (25 PSI)
Warm Control Pressure - 3.65 Bar (50 PSI)

Dead nuts on what the specs say. Tomorrow (I have no muffler and kids are asleep) I will give it a try. (OK, I took a chance of my wife killing me and fired it up... it ran fine I think, but requires a little more outdoor voice time tomorrow to be sure of the fix)
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Old 09-13-2011, 06:56 PM
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Turbofrog
 
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Sounds like the wur was the cause with the too lean pressures?

If it still gives trouble (or for peace of mind) you should do the injector flow test too to make sure there are no bad injectors in your set. You can't check the opening pressures but you can check that they all flow the same on idle and when pushing the plate. Search for thierrys and sups thread on how to do it.
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79 930: HX40S#16, MS3pro+ID1000+044+E85, Ignition: 123/TUNE/MSD6A, True split BB, 2*turbosmart38
Old 09-13-2011, 07:26 PM
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Thanks Smurf. I cleaned, flow checked and pressure tested each injector individually when I had them out of the car. I have tried the little 6x baby food jar trick in the past. What a PITA that is to do. I figure between getting the CO set and running it on the dyno I will be able to figure out if all 6 are doing what they are supposed to. I can't wait for the day I can drive down and put him on the rollers... that will be fun!
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Last edited by DSPTurtle; 09-13-2011 at 09:24 PM..
Old 09-13-2011, 08:18 PM
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I wish mine was that easy. Glad it worked out for you. Did you have one or two discs in your wur? I have two.
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-84 911 Carrera w/ 930 t/p,efi'd,dizzy free,HFS turbo, 78 930 RoW no option sunroof coupe, 64 Corvette roadster, 71 911T, 73 911E, 67 Bronco survivor. 71 FJ40, 95 M3 (for sale)
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Old 09-14-2011, 02:57 AM
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This WUR is a leaky piece of unreliable $h!t!!! Ugh... it is pissing me off so bad. Anyone know if there is a rebuild kit available or how long the turnaround time is to send it to a BL or someone like that?
I don't care if it is adjustable right now or not (although one day I will)... I just want this leaky piece of unreliable (r@p fixed. Everytime it comes up with a new pressure to hold. God forbid I plug in the strip... then nothing will run for more than 10 seconds. But, with the strip unplugged and a little coaxing, the motor runs, idles and revs just great!
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Engine Rebuild & Restorations
Old 09-14-2011, 07:06 AM
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Crotchety Old Bastard
 
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I think I might know someone who can help.
Let me check my cores and see if I have something that will get you by for now.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-14-2011, 09:35 AM
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Anyone know if a -153 will work for the time being?
-054 is what it came with stock. 1979 930 motor.
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321-806-8664
Engine Rebuild & Restorations
Old 09-14-2011, 06:33 PM
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Here's what a crappy WUR will do for your throttle response... Dang this is frustrating!!!

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Engine Rebuild & Restorations
Old 09-14-2011, 07:04 PM
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Crotchety Old Bastard
 
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Any of them will work well enough to get you by. I posted on your other thread that I have a used one you can borrow while we rebuild the one you have if that's what you're wanting to do.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-14-2011, 07:10 PM
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