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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old August 25th, 2014, 14:21   #31
Scott_DeWitt
 
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Later cars don't have an A/C clutch and compressor operation is controlled by a cycling valve or variable displacement unit that regulates the flow of freon. 4.2 C5 Allroad, B6/C6 and MKIV cars all lack a compressor clutch. I put a B6 AWX 1.9 tdi into a B5 and had to swap out the A/C compressor because the control unit for the B5 A/C doesn't produce the proper signal to the A/C compressor.
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Old August 25th, 2014, 14:42   #32
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Learn something every day. Thanks.
On the B5.5 Passat, the Climatronic controls a relay, J44, which controls the clutch. In the non-Climatronic version, the clutch is controlled directly by an AC Cutoff Control Module. The ECU also feeds into this module from pin T94/50.

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Old August 26th, 2014, 08:55   #33
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What engine control unit did you use?
EDC16 or EDC15p?
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Old August 26th, 2014, 09:27   #34
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Any fuel mileage? lol.
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Old August 26th, 2014, 11:09   #35
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Yes I am curious about the fuel mileage. As you can see in my fuelly, the mileage I get on a 4motion Passat is not as good as on the fwd passats. This is to be expected with the awd and also the W8 Passat is quite a lot heavier than the regular TDI. I don't know how heavy it is now without the W8 engine however but probably still heavier with the larger fuel tank and AWD etc.

Curious what yours will be!
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Old August 27th, 2014, 07:09   #36
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Do you have any L/100 or Mpg to report? What speed does the engine rev at 100kph?
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Old August 27th, 2014, 08:58   #37
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Quote:
Originally Posted by Windex View Post
Do you have any L/100 or Mpg to report? What speed does the engine rev at 100kph?
If the stock Allroad gearing is used revs at 60mph would be about 2300. At 80 mph 3100 rpm.

Comparing to a diesel transmission 60 mph yields 1800 rpm and 80 mph approx 2400.
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Old August 27th, 2014, 09:12   #38
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Okay, so I have still not figured out the A/C yet... The BHW engine that's in my allroad definetly has a clutch on the a/c compressor it's identified as N25 in the wiring diagrams...
So there are many similarities and diffrences between the Allroad and the Passat's A/C systems...
-They both have A/c compressor clutches, that actuate from the same wire gn/ge (green and yellow). When I power the wire directly from the battery, the clutch engages, but even with my heat controls set to LO, no cold air from the vents. (the compressor and lines were serviced yes).
-Both systems have a J44 (a/c cluth relay).
-Both systems seem to have some kind of pressure switch Passat:F129 (a/c pressure switch) Allroad: G65 (high pressure sensor)
-Audi J285 Control Module vs passat J255 Climatronic control module.

So essentially the big thing is is the J255 Climatronic control module vs E87 A/C control head, How do I fool the E87 A/C control head into: 1: Getting J44 relay to energise = A/C clutch to work. 2: Configuring the vents in the cabin to blow the air through the cabin a/c rad.
Fuel economy has been very good thus far. I've averaged 6.0L/100km over about 200km last week. I was driving between 110km/h and 125km/h, this was without the cruise control, so my acceleration wasn't as smooth as it could have been. I will be driving from toronto-ottawa within the next few days with cruise control, we will get a much better idea then.
At 130km/h My rpm is at 2400. 6th gear has a .54 ratio. So at 100 I must be around 2100? Give or take? I'd have to check.
All thoughts on the A/C system are appreciated, I've looked over the diagrams several times now, and I'm running out of ideas.
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Old August 27th, 2014, 09:15   #39
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Quote:
Originally Posted by Ifixit View Post
What engine control unit did you use?
EDC16 or EDC15p?
I'll have to check. I will get back to you.
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Old August 27th, 2014, 09:36   #40
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Quote:
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6th gear has a .54 ratio.
What transmission are you using? .54 is not an 01E gear ratio.
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Old August 27th, 2014, 10:59   #41
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What fault codes are stored in the allroad climatronic module currently?
Is the econ light always on?
No need to fool the clima module it should work as long as the ac pressure switch is functioning correctly you can check this in clima mesuring blocks
I would also check the ac compressor cut out signal from ecu to clima module
(should be a wire in your system not via can)
I will check wire diag for you and see what I can find
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Old August 27th, 2014, 11:22   #42
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3 wires from ecu to clima module

grn/blu clima A2 to ecu pin 37
blk/yel clima A7 to ecu pin 40
blk/grey clima C15 to ecu pin 41

are these connected?
EDC16 or EDC15P ecu?
ECU part number? or just post an autoscan would be helpful
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Old August 27th, 2014, 11:58   #43
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Quote:
Originally Posted by Ifixit View Post
3 wires from ecu to clima module

grn/blu clima A2 to ecu pin 37
blk/yel clima A7 to ecu pin 40
blk/grey clima C15 to ecu pin 41

are these connected?
EDC16 or EDC15P ecu?
ECU part number? or just post an autoscan would be helpful
That is true with the original allroad ECU. But on the Passat BHW ecu, I can't find any correlation to the pins you mention. There are two connectors on the Passat ecu, T60 and T94. To which are you referring?

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Old August 27th, 2014, 12:02   #44
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Quote:
Originally Posted by Scott_DeWitt View Post
What transmission are you using? .54 is not an 01E gear ratio.
In post 10 he said FTF tranny.

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Old August 27th, 2014, 12:32   #45
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Quote:
Originally Posted by jonlowe View Post
In post 10 he said FTF tranny.

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Yes, an 01E FTF.

http://workshop-manuals.com/audi/a4_...os_capacities/
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