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RE: Calling all 4kq turbo conversions
You are forgetting a major component here. The whole wiring harness needs to
change to get the computer and all the other electronics to work. This also
entails removing the dash and interior. And in the 4kq the intercooler will
NOT fit in the front without major modifications. Intake is really the most
difficult thing overall but getting the coupe quattro intake would make that a
lot easier. There are many other little things that come up as well and I
will be posting a complete list when I am done. This is at least a month long
project in a 4kq and more likely 2 months. Even the Bennet Bros. who do this
for a living take 6 weeks and only work on 1 car at a time.
864000csq 2 1/2 cat back, H&R-Boge,advanced and loving it. Drilled and
stopping it. Koenig Cobra 16x7 with AVS Intermediates, conversion in
95 subaru legacy
I've done the swap on my front wheel drive Coupe, but I think the
procedure is the same.
> relocating the battery
I stuffed it into the pass side well in the trunk.
>, the right tie rod
Modified an Ur-q a used tie-rod (thanks to Mike Hopton) to accept 4000 end
>, air conditioning
Threw it out long time ago. For the swap you will have to
relocated it to the other side of the engine like in the Ur-q (if you
really have to have it).
Since I am using an oil cooled turbo I took a chance and run it with a
stock re-cored radiator and it works very well even on the hottesd days.
> intercoolers, etc, etc.
I used a 1988 5kt intercooler and hoses and stuck it in the grill.
Didn't even loose the high beam light (four light system) but I did
have to use hood pins and had to do some cutting to the grill itself
and the metal around it. All uoy can see hwever from the front is
the intercooler a' la Mitsubishi Lancer rally car.
> In other words, what problems they ran into and how they went around
> them like if the 5kt clutch/flywheel would bolt up to the 4kq
Without a problem. You just replace the pilot bearing in the
crankshaft if your engine came out of an automatic tranny car.
> or if the intake manifold fit under the hood without modifications
Same intake as on the Ur-q so there is no problems. You have to get
the 5ktq throtle cable. I used the stock Coupe cable but that's
streching it. now the gas pedal is very high and uncomfortable for
heal and toe driving.
> or the hydraulic system.
I use the intake vacuum to operate the brakes. The only problem is
the lack of power brakes under left foot braking otherwise it just as
good as with a N/A engine. You might want to use a cylinder head out
of a car with a vacuum pump but you would have to change the valves
to sodium cooled. I know someone who has done this to get rid of the
hydraulic system on their Ur-q.
The biggest problem I had was pounding in the pass floor to allow the
5kt downpipe (I didn't want to cut it). It would fit fine but I
wanted some more space between the hot downpipe and the undercoating.
I also used the stock Ur-q top part of the air cleaner housing to allow for
the turn around of the fuel injection system. Except for the
aluminum spout on top of the air sensor plate and the aluminum bottom
air cleaner housing my system looks exactly like the Ur-q system.
Becouse of it all the pipes are short and reduce turbo lag.
Another problem is finding a spot for the oil cooler. This hoever is
should be decided by the owner. I modified the lower grill in the
You might ask why I didn't do this to a quattro. Well I used the
Coupe as a test vehicle. I wasn't afraid to take a grinder or a
hamme to make things fit. I am however amazed how easy the swap
itself was and that I didn't have to make things fit.
Next summer is the quattro's turn to be turned into a monster.
Now that the Coupe is in the storage and I am driving the quattro I
don't know weather to be happy that I am driving a quattro in the
snow or sad becouse I no longer hear the sweet sound of a turbo
If you want it, do it.
1982 Coupe TURBO (473,150 km)
1984 4000s quattro (soon to be a rally car)
1986 4000s quattro (300,000 km)
1970 Porsche 911E Targa (for sale)