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930porsche
 
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Join Date: Jul 2009
Location: Naples
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RPM drop

Mark, I will go over it and get back with you. Thank you to all of you and your inputs. I will get back to you with hopefully good news.
Old 02-23-2010, 02:09 PM
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Crotchety Old Bastard
 
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Jean,
I would not adjust anything until you check your pressures. If your pressures are off AND you have fiddled with other things you now have multiple problems.
If your WUR is not getting power or is faulty in any way it will show up in the pressure curve. I'll post a picture for you this evening.
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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
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Old 02-23-2010, 03:01 PM
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Saved you a job Brian

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Old 02-23-2010, 03:14 PM
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I would also stick a timing light on it and check the timing because if the timing is retarded to less than stock for some reason you'll have a slow cold idle that will die out and stall when the cold start vacuum retard solenoid opens after a minute or 2.
That is if there is a cold start vacuum retard solenoid on your car.

The timing specs for your car should be on the inside of the rear lid. you have to duck down and look up at it while it's open.
The owners manual has the correct timing specs too, if it is the origonal manual that came with your car.
Old 02-23-2010, 03:15 PM
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Crotchety Old Bastard
 
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This is how/where you mount the pressure gage. The gage plumbs between the left hand (14M) fitting on the WUR and the fuel head. You can check your system pressure as well to see how the pumps and head are doing.


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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 02-23-2010, 07:43 PM
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930porsche
 
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RPM drop

Ok Brian I am going to buy a fuel guage today. I was wandering if I could use a 1986-1989 WUR? It should be the same one on a 3.3 engine. Let's get a step further. Can any of the air cooled turbo interchange their WUR? To me it looks like they should. Anybody has any good feedback about it or confirmation?
Old 02-24-2010, 10:07 AM
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930porsche
 
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RPM drop

No air leak or fuel pressure drop on top of engine. after a good warm up the Idle screw turned all the way into the close clockwise position will not shut the engine but keep it running at about 1050 RPM. When accelerating, the engine stop and then idles ok then dies off later on. I think it is under the car. Maybe air leak somewhere underneath. Any suggestion?
Old 03-15-2010, 12:41 PM
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Quote:
Originally Posted by 930 porsche View Post
No air leak or fuel pressure drop on top of engine. after a good warm up the Idle screw turned all the way into the close clockwise position will not shut the engine but keep it running at about 1050 RPM. When accelerating, the engine stop and then idles ok then dies off later on. I think it is under the car. Maybe air leak somewhere underneath. Any suggestion?
What exactly were your cold and warm control pressures, as well as the system pressure when you tested it? All these pieces of information tell different stories regarding the state of your WUR.

Also, do you have the means of measuring your AFR's - or at the very least have access to a CO% meter to check the emissions at the tailpipe? It would be helpful to know what your mixture is doing at least at idle, if not throughout the entire power band.
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Last edited by mark houghton; 03-15-2010 at 02:04 PM..
Old 03-15-2010, 02:00 PM
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