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beancounter
 
jwasbury's Avatar
 
Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,123
Does the 930 WUR respond to vacuum as well as pressure?

The vehicle in question is my '79. I know that the WUR will drop control pressure to richen the mix when it sees boost pressure. Is it supposed to raise control pressure on vacuum? I know that some years of the NA cars would have higher CP on vac, then drop the CP in the absence of vac as a full-load enrichment feature.

I check my fuel pressures a while back and found them to be on spec. However, I did my warm CP test without the engine running (just had the bimetallic strip heated up).

I've been chasing an annoying part throttle stumble-miss issue, and it occurred to me that the WUR would be under vacuum at idle and part throttle conditions and would possibly be raising the CP vs. my earlier static test (which indicated a warm CP within spec). I re ran the test today with the engine running and had the same result as static (within spec).

I suppose I've answered my own question here, but can anyone confirm that this is how the 930 WUR is supposed to behave?
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Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 10-10-2008, 07:43 PM
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A fellow Pelacanite
 
NathanUK's Avatar
 
Join Date: Nov 2006
Location: UK
Posts: 2,002
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This has been discussed and IIRC the answer is no.

Do a search. Alan tested his and at first thought it did, but then later found it didn't.

There is of course a possibility that a different part number might.

Have you checked if yours does?
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 10-11-2008, 04:50 PM
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