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Steve 914 · Joined: 26 Aug 2022 Posts: 9 Location: South Africa

Does anyone know the various cold, hot and pressure / vacuum settings for the Carrera GT. The WUR type is 062 which does not seem to be listed anywhere that I can find. Would also like to get confirmation on the system pressure for the Carrera k-jetronic system. Factory data sheets only quote figures for the 931 type motors.

Steve

Eliza · Posted: Thu Sep 01, 2022 8:02 pm Post subject:

According to PET, the M31.50 engine should use the same WUR as the M31.01/02/03 until 1980. So the WUR specs for a Series1 turbo should be what you're looking for.

I have those for you, just send me a pm and I'll forward the relevant page from the WSM

Eliza
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1985 924 NA RoW
1981 931 S2 RoW

peterld · Posted: Thu Sep 01, 2022 9:40 pm Post subject:

I would expect the GT to closely resemble the S2 Turbo, as the majority of it is MY81 Turbo, including DITC.
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80/81 932/8 ROW

Eliza · Posted: Thu Sep 01, 2022 10:38 pm Post subject:

Possibly, but the WUR used for the GT is (according to PET ) the same as the one for Series1 turbos. Series2 turbos use a different WUR.

I have the pressures for the 0438140062 WUR which is the one Steve has.
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1985 924 NA RoW
1981 931 S2 RoW

Steve 914 · Joined: 26 Aug 2022 Posts: 9 Location: South Africa

Thanks for the feedback. My car is a very early Carrera, chassis 0065. It came out of the factory in September 1980 which would normally be a MY 81 car.
I have a WUR for my early 924 Turbo and that is a type 098. My Carrera has a type 062.
I did look at PET but it is a bit unclear as it lists a couple of different types, a 105.00 for the 01/02/03 motors and below a 105.X for the same motors plus the /50 motor.
The test results from my 062 give a much higher control pressure than the figures quoted in the Porsche Technical Specifications for the 924 range (including the Carrera GT). However the tech info refers only to the /01. /02 and /03 motors. No mention of the /50 motor under this section.
There is no enrichment under manifold vacuum but there is enrichment under boost pressure. Look forward to finding out what these should be. Hopefully the car will run much better.

Eliza · Posted: Fri Sep 02, 2022 3:35 am Post subject:

Just to clarify, Porsche part no. 931 606 105x cross-references to Bosch no. 0438140062.

Steve, are you sure yours ends with 092 not 091? 091 would be for a 931 RoW and corresponds to 062 but has an additional thermo switch and a separate WOT port.

If the one you have does have a part no. ending 092 it was never for a Porsche car but a Renault R 30 TX 2.7l 6 cyl. ( in case anyone wonders, I have the historic Bosch equipment lists for most if not all K-Jet components

). Although I don't know specs for that WUR, I wouldn't be surprised if your car won't run well with that

The 924 n/a RoW WUR Bosch no. ends with 024, the one for ( at least RoW ) series2 turbos ends 063 and was also used for 4.5l 928s.

So Steve, if you'd like the pressure specs for the 062 WUR, pm me your email address and I'll send you something you'll like. I also have those for the 063, if you want to compare them.

Eliza
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1985 924 NA RoW
1981 931 S2 RoW

kondzi · Joined: 02 Jul 2018 Posts: 485 Location: Poland/EU

I run this WUR in my 931. Pressures are a bit higher than with other WURs...
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)

Carrera RSR · Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK

My advice regardless of the S1/S2/CGT WUR is to get the car on the dyno and set the fuel pressures according to the best running performance/bhp on the rollers. The factory manual is probably correct. But it is best to check and adjust on the dyno what is best for your car.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Cedric · Joined: 27 Aug 2004 Posts: 2609 Location: Sweden

Im on Carreras boat here. Dyno might not be necessary since its not a question of power, but to comfirm safe AFRs for a turbo car, though its a safe way to test it in all gears without reaching silly speeds on the road, most of them have tail pipe wide band sensors to hook up if you dont have any own alternatives. If you can run with a wideband sensor on the road its almost as good. If i had a car like yours i wouldnt go proper full throttle without checking it first with a wideband, especially after wur fiddling.
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1980 924 Turbo
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