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gumba's Avatar
 
Join Date: Dec 2001
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Leask adjustable wur, whose's set one up?

I recently installed a Leask adjustable wur. Out of the box I'm getting high 11:1 a.f across the rpm range, and 10.5 at full boost.
I raised the warm control pressure (4mm screw on the bottom)by 1/2 turn, which slightly raised the a/f's to 12.2:1 cruising.
How do I get the a/f's in the 13/1 range for highway cruising.
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Harold
'79 930/DP935
'68 VW Turbo Crewcab
Old 06-10-2018, 12:22 PM
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Turbo Powered Snow Blower
 
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AFR check after new turbo
https://r.tapatalk.com/shareLink?share_fid=844&share_tid=994289&url=https%3A%2F%2Fforums%2Epelicanparts%2Ecom%2Fsh owthread%2Ephp%3Ft%3D994289&share_type=t

^^^
There is some good info in this thread.

Iím working through tuning mine now. I have probably 1.5 turns on mine to get the cruising afr to 14.4 to 15 range in the 2k to 3k rpms. So keep turning yours.
I now need to work on the on boost adjustment again. I could not get on boost out of the 11s with the cruise AFRs in the 13ís.


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Derrick
Old 06-10-2018, 09:39 PM
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Gumba, you should verify all your pressures against what is on the spec sheet that came with yo ur Leask WUR, Cold, Warm and Enrichment pressures. Your Warm pressure should be around 3.6 - 3.8bar. If you are lower than this, then you can keep raising the pressure and leaning your mixture into lower numbers. I was able to get mine into a range that works nicely for me. It took me 6 or 8 times putting the guages on and tuning the WUR, yes its a pain in the ass, but well worth the effort.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 06-11-2018, 03:47 AM
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To richen up the afr at full throttle does the full throttle enrichment pressure get raised or lowered?
Full boost afr is 12/1, I'm shooting for 11/1.
I'm making 1/2 turn changes to the warm control pressure, adjusting the afr and idle rpm then going for a short drive.
At this point I've been using my wideband a/f gauge built into the tach to check the adjustments. Once set or near set I'll connect up the pressure gauge to see what the pressures are.
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Old 06-11-2018, 11:44 AM
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To enrichen the mixture you need to lower the pressure, to go leaner you'll need to raise the pressure.

I had it wrong in my other thread, Alan corrected me - see below...

Quote:
puddy -
"To confirm, raising the warm or cold pressure will richen the mixture, lowering the pressures will lean it out?"

Alan
"No , other way around. A higher WUR pressure makes it harder for the airplate to move so the fuel metering piston does not dispense as much fuel for a given airflow = leaner."
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & outlaw pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.

Last edited by puddy; 06-11-2018 at 12:52 PM..
Old 06-11-2018, 12:28 PM
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Ideal full throttle afr, 11 or 11.5/1?
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Harold
'79 930/DP935
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Old 06-12-2018, 09:02 AM
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Crotchety Old Bastard
 
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WUR should be tuned to fuel pressure not AFR. Verify system pressure is in spec then verify warm control pressure is in spec. If WCC is off spec adjust it to the middle of spec. AFR at idle is then adjusted with the idle mixture screw. The only WUR setting that should be adjusted for AFR is boost.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 06-12-2018, 09:38 AM
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My bad, thanks Brian.
So after setting it to specs, and my warm control pressure is 36.5 bar my cruising afrs are slightly above 12/1. How far can I increase the warm control pressure to lean it out?
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'79 930/DP935
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Old 06-13-2018, 12:08 PM
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Corretion 3.65 bar
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Harold
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Old 06-13-2018, 12:09 PM
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If your warm control pressure is in spec leave it there and adjust the idle mixture to 13.0-13.5 AFR at idle. This should give you ~14.5 AFR at cruise.
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'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 06-13-2018, 05:46 PM
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Agree with Brian.
And I would be aiming at 12 AFr at boost - not lower.
Alan
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Old 06-15-2018, 10:11 PM
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