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mooney265's Avatar
 
Join Date: Sep 2008
Location: New Orleans
Posts: 1,365
Garage
Warm CP begins to fall at T+9 Min???

I have a BL Adjustable WUR with RPM switch. Have had it for 4-mos. Adjusted it 3-times in the past.

Recently, I noticed the car's AFR's were fluctuating towards a rich condition, so I thought I'd re-verify my last settings done on 9/18. They were:

System Pressure: 6 BAR
Cold: 2.6 BAR
Warm: 3.8 BAR
Enrich: 2.5 BAR - - that was running a little rich [below 10 AFR] using a 4,800 rpm pill - - so, was going to adjust today…

So, today I hooked up the gauges and saw the following:
System: 6 BAR - - Checked OK
Cold: 2.6 BAR [Time + 0] - - Checked OK
Warm: 3.8 BAR [Time + 2 min] - - Checked OK
Enrich: 2.5 BAR [Time + 3 min] - - or, a 1.3 BAR drop for enrichment - - Checked OK

My plan was to adjust the enrichment up to 2.9 BAR [or, 0.9 BAR drop]. As soon as I was completed adjusting the enrichment up to 2.9 BAR, I noticed my warm control pressure beginning to drop on its own!

This pressure drop began at [Time + 9 min] and continued for the next 6-minutes until the pressure held at 2.9 BAR. So, the pressure is slowing dropping 0.9 BAR over a 6-minute period. This pressure drop begins at Time + 9-minutes from "cold condition." Once the warm pressure leveled off at 2.9 BAR, I tested the enrichment pressure and it was 2.0 BAR [or, 0.9 BAR below warm pressure]. So, the enrichment was still working - - just followed the warm pressure on its way down…

I was able to replicate this throughout the morning a total of 3 times. I never started the car... What's going on with the WUR??

By the way: I checked the voltages at the WUR throughout the process: Steady 11.70 Volts with a 10-amp charger hooked to the battery and running constantly. Voltage at the battery stayed a constant 12.25 volts.

Any ideas????
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 10-24-2009, 08:56 AM
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mooney265's Avatar
 
Join Date: Sep 2008
Location: New Orleans
Posts: 1,365
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Update:

I ran the car with gauges hooked up and saw no loss in CP...

I'm not an expert on the WUR, but, it seems that if the WUR is powered for a long duration, and the car is not running, that it will go into a fail-safe mode???

Obviously, by running the car, the WUR begins to "warm up" due to the engine warming up... And, by powering the WUR without the engine running, the heating element would need to constantly be on in order to "warm" the WUR...

Anyway, I got the WUR enrichment pressure adjusted and the car is getting closer to the correct AFR's under boost... Still a little low, so will probably will raise the enrichment 0.2 BAR - for a 0.7 BAR difference from warm to enrichment pressure...
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 10-25-2009, 12:25 PM
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