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Infidel
 
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Adjustable 930 WUR Website
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 04-21-2011, 03:53 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1041 (permalink)
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To bad, I was hoping this UTCIS would work as we need it.
Some upgrades from time to time could make it a fantastic part.

Nothing against the unwired guys, but It seems the stepper motor
is the problem from the beginning.
Not bulletproof as we desire for our funny cars.

Falk
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87 930 bblk/blk
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Old 04-21-2011, 10:39 PM
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Metal Guru
 
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Quote:
Originally Posted by Alan L View Post
The extra fuel has actually B.. all cooling effect. You are just shifting the combustion further away from the max power stoichiometric point, so detuning it by running it overly rich. But either way, around 12.5 would seem a do able upper limit assuming all else was well.
Good point Alan.
AFR of 12.5/1 is the sweet spot for max torque for all applications, turbocharged or n/a. Besides, anyone who's running a wur ain't hitting 11.5 at max engine speed. Yet we don't hear about a lot of blown engines. The problem with CIS is that to get 12.5/1 at max rpm, you'll get 11.5/1 in the mid range.
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Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 04-22-2011, 05:02 AM
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Toofah King Bad
 
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Good news. . .the stepper motor has been replaced in favor of a fuel injector serving as a frequency valve. Stay tuned for report.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 04-22-2011, 06:58 AM
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Great!

Quote:
Originally Posted by Rasta Monsta View Post
Good news. . .the stepper motor has been replaced in favor of a fuel injector serving as a frequency valve. Stay tuned for report.
That is exciting, may be they get it straightened-up. Please post any updates here. I talked to Steve, +/- week ago, and he did not say anything about this new development.
Hmmm...
Old 05-11-2011, 12:08 PM
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Tinkering Pays!!
 
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Sounds Promising...
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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 05-11-2011, 05:31 PM
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Agreed. . .should have been the first approach, IMO. My vibraty little 2.0 has been destroying the stepper motor/needle valve assemblies with aplomb.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 05-11-2011, 05:38 PM
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still have this available, works great.

electronic csi controller
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Old 05-11-2011, 05:41 PM
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Quote:
Originally Posted by Rasta Monsta View Post
Stay tuned for report.
Report: controller box arrived with PCB bouncing around inside it, because the double sided tape they used to secure it failed in transit. This marks the one year point since I first fired my new motor. . .I won't even speculate how many driving days and events I have missed while frakking around with this unit.



Done.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 05-19-2011, 02:05 PM
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Has anybody had their unit get Alzheimer's? Every once in a while my unit loses my custom-programmed pressures and replaces it with what seems to be some kind of default pressure settings.
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Old 05-20-2011, 07:43 PM
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Yes.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 05-20-2011, 10:07 PM
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Need your opinion

Quote:
Originally Posted by 911nut View Post
Good point Alan.
AFR of 12.5/1 is the sweet spot for max torque for all applications, turbocharged or n/a. Besides, anyone who's running a wur ain't hitting 11.5 at max engine speed. Yet we don't hear about a lot of blown engines. The problem with CIS is that to get 12.5/1 at max rpm, you'll get 11.5/1 in the mid range.
UTCIS DWUR is programmable trough the rpm range, so I've been told. Could it be remedied by adjusting CP?
I'm thinking about getting one myself, but I'd like to know your opinion, since I'm new to DWUR idea.
Old 05-22-2011, 07:23 AM
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Quote:
Originally Posted by 911nut View Post
The problem with CIS is that to get 12.5/1 at max rpm, you'll get 11.5/1 in the mid range.
Unless you get the Leask add-on unit that prevents the WUR from getting boost signal (via solennoid) until a preset RPM.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 05-22-2011, 11:41 AM
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point of standard WUR boost pressure

Dumb question - but maybe not - has anyone ever thought of changing where the boost pressure is picked up for the WUR from the throttle body port to down the intake manifold further, where it's really seeing actual air pressure in the manifold instead of at the throttle body?? I've found a fair pressure differential across the throttle body except on full open throttle, and is there a possibility that the overrun from the WUR is due to picking up the higher pressure off the back side of the throttle and in the body itself rather than the pressure in the manifold?
Old 06-17-2011, 06:25 PM
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Quote:
Originally Posted by Billytex1 View Post
Dumb question - but maybe not - has anyone ever thought of changing where the boost pressure is picked up for the WUR from the throttle body port to down the intake manifold further, where it's really seeing actual air pressure in the manifold instead of at the throttle body?? I've found a fair pressure differential across the throttle body except on full open throttle, and is there a possibility that the overrun from the WUR is due to picking up the higher pressure off the back side of the throttle and in the body itself rather than the pressure in the manifold?
I dont think it makes any practical difference altho you are probably right. You can tune the DWUR to anything you want via MAP. As long as you are getting a consistent reading of MAP be it either before or after the butterfly, the end result regarding tuning should be the same - as long as you tune to an AFR. The MAP is just an indicator of what the engine/turbo is doing at any point in time, and you want the WUR to behave accordingly to produce a desired AFR. If it is too rich, then increase the CP at that MAP value, etc. If you shifted the vac pick up point then you would certainly need to re programme the WUR according to the pressure differential across the butterfly. The only bit of the programme that would be the same is at WOT.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 06-17-2011, 06:56 PM
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BIllyTex, I think you have a good question. I recently installed EFI and had to relocate my MAP samlig point from the throttle body ports to the manifold itself to get an accurate reading. There is a significant difference in MAP between the two sources. I did not do this with my DWUR when installed, but perhaps I should have. Very good question, I think.
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1988 930 coupe - Silver Metallic
3.3L w/GT35R, B&B Headers, RarlyL8 muffler, TurboKraft IC, Tial WG, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ...
Old 06-18-2011, 03:14 AM
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Interesting. . .on my car the WUR boost signal is branched off the brake booster line, which is downstream of the throttle plate.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 06-18-2011, 07:46 AM
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The vacuum signal originates from below the throttle butterfly.
The boost signal originates from above the butterfly. The DWUR works off both as far as programming capability - but mostly off the boost signal - ie this is where your fuel map becomes most critical and the DWUR function most important. So you could argue that above the butterfly is where you want to be. But it makes no difference.
Except if you swap fuel maps to a system where the MAP port is located differently. Then the relationship between fuel delivery and engine activity will change.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 06-18-2011, 12:03 PM
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After playing with the DWUR, there are a few improvements that could be added.

1) Instead of entering control pressure, it should use a wideband 02 sensor in a closed loop system. That way you enter AFRs instead of control pressures.

2) The control pressure should be measured at the DWUR and electrically sent to the "brain" (Mine has a thin fuel line that can be easily kinked)

3) Random loss of programmed values should be fixed.

4) Output a warning signal whenever AFR is say 0.5 points above the requested value.
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Old 06-18-2011, 02:40 PM
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5) The valve body should be mounted as close as possible to the metering head - installation in the factory location is not necessary, as long as the temp sensor is well placed.
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» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 06-19-2011, 08:01 AM
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