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Join Date: Sep 2005
Location: Clifton, VA
Posts: 153
Diff WUR to Engine warm control pressure

I am trying feverishly to tune my complete rebuilt engine to no avail...

I have a 1983 Euro Engine, minus emissions, euro injectors with a 86 WUR Bosch 0438140153

Will having a US version versus having a Euro make a difference when setting the correct pressure..

what should be my warm control pressure 3.95 +- .2? or do I do it to Euro spec 3.65 +-.2 ? or a combo

or am in a for a long haul based on the nature of the beast
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Scott

1979 930 - Black on Black and in the woods

"My third child that will cost more in the long run" :shock:

Last edited by vascott01; 03-26-2016 at 09:47 AM..
Old 03-26-2016, 09:00 AM
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Crotchety Old Bastard
 
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You don't say what model your '83 is, 911 or 930. The WUR you have listed is for a 930.
There is no provision to set control pressures on this system, it is pre-set from the factory. If you have gone inside the WUR to do this something is wrong as the pressures do not vary from stock unless the component is worn out. Warm control pressure at the WUR is dependent on system pressure from the fuel distributor being in spec which means the FD must be the correct match for the WUR (USA vs Euro). Specs are ranges so there is some wiggle room, generally you can use a USA WUR with a Euro FD but not the other way around.
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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 03-26-2016, 11:22 AM
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Well...I did a Ohm test on the WUR and got nothing.. So essentially at this moment my question is mute from what I have read.

Rarlyl8 thanks for your response. I did find the Bosch number for the FD 438120205. My understanding this will be fine with the WUR that has been paired with it..

I have been chasing a AFR issue for awhile and now I think I can say it is 99.5% sure of the issue hence trying to adjust..I had made it into an adjustable WUR thinking this would help

Can anyone also Concur on ohm readings and what it should be for WUR Bosch 0438140153 and FD being compatible with this make and model..

Many thanks all
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Scott

1979 930 - Black on Black and in the woods

"My third child that will cost more in the long run" :shock:

Last edited by vascott01; 03-26-2016 at 04:22 PM..
Old 03-26-2016, 04:19 PM
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Crotchety Old Bastard
 
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438120205 is the air meter assembly. The aluminum USA FD P/N is 438 100 145, black steel Euro is P/N 438 100 037. You're not going to get a different answer on FD/WUR compatibility, the system pressure spec is different for USA vs Euro and the WUR pressure ranges are set to match. You can mix and match WURs but the results are not optimal. A USA WUR paired with a Euro FD is more compatible than a Euro WUR paired with a USA FD. If you have Lambda things are further complicated.
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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

Last edited by RarlyL8; 03-27-2016 at 12:54 PM..
Old 03-27-2016, 06:31 AM
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