I would think you need the fueling adjusted with the work you have had done.

W6DPO's are standard WR Ur ones, W7DTC's (standard CQ ones) are MB ones ISTR... (Mildly - circa 230-270) Uprated cars tend to run standard plugs. AFAIK.:tup:

W6DTC's are standard CQ plugs

according to snapon autodata its W7DTC and it also says wr/gv use W4DPO.... if its wrong blame the knock off autodata cd :D

Nope, you're right, they're W4DPO's for a WR, Sorry. The Triple electrode ones for the CQ I have here are Bosch W7DTC's, as you say.

I had all sorts of trouble with this a few years ago getting them from South Hereford Audi 7's are incorrect for the KV

http://www.quattroforum.com/forum/kv...k-plugs-4.html

I also had a fun time finding the right plugs a year ago.

W6DTC are the correct standard plugs for a KV. 200% sure. :tup:

But what if I wanted to upgrade to bosch super 4's? or iridium's ?.. What do i need to look for to find the corresponding updated plug?

For bosch plugs...
W = The seat and thread section of the plug.
6 = Heat range code (high number equals higher running temperatures of the electrode/plug.
D = Thread length and spark position.
T = Electrode version
C = The material used (C-copper E-nickel yttrium P-platinum S-silver)

You really need to match the heat range number and electrode gap.... you can run with more electrodes but not less than standard. This is why CQ engines with single electrode plugs installed can have running issues under load..

The Bosch W6DTC has been discontinued by Bosch, although you can still get them from Audi - that's why GSF will try and flog you W6R DC which are single electrode.

Regarding the KV, the W7DTC was specified if the car had a catalyst. From 1989 onwards (series 3 cars) all KV engines came with the W7

Thats where the confusion starts and the KV doesn't run right on 7's - well mine didn't anyway.

Also Audi will supply you single electrode plugs as the family album for the CQ only shows up to 85 MY KV engines. You have to look at the 90 Quattro for the right plug which is WDT6's- Its a right old mess.....!