4ktq cooling shrouds

passat TS passat_ts@hotmail.com
Tue, 20 May 2003 18:20:53 +0000

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I also suggest what Jim says regarding the moving the oil cooler.

Just another fact, so far all the 4K turbos I've seen running rally have one
way or the other upgraded the radiator, including one of the listers.

If you track your car another option is to open vents behind the turbo and the
radiator on the hood. That improves air circulation, again this is used in
some 4K race cars.

Just an interesting fact, I measured the air speed behind the radiator of my
coupe and there is next to none (car at 70mph air max air speed registered 12
mph). Granted I have a solid skid plate under the whole front of the car, it
might be a little better.

Good luck,

>From: Jim Green
>To: EBavely , quattro@audifans.com
>Subject: Re: 4ktq cooling shrouds
>Date: Tue, 20 May 2003 10:17:09 -0700 (PDT)
>--- EBavely wrote:
> > Hello all...
> >
> > First off, I'm pleased to announce that the new
> > engine for the 4ktq is doing
> > just fine and is well under way in break-in stage.
> > Some of you might recall
> > the oil pressure problems I had with the first MC
> > engine... I never found
> > out what exactly the problem was, but swapping in a
> > new block and crank has
> > seemed to resolve the issue.
> >
> > Anyway, the 4ktq seems to run a bit warmer than I'd
> > like (runs 1 or 1.5
> > lines higher than half way on the gauge at the
> > highest, slightly cooler on
> > the highway) and I'm wondering among other things
> > how important the cooling
> > shrouds are to the radiator on the 4kq. Are these
> > essential to the cooling
> > of the engine?
> >
> > I have the top plastic shroud, driver's side shroud
> > (between the rad and
> > the fender) plus a new homemade aluminum engine side
> > shroud (I've got the
> > cardboard pattern if anyone wants to copy) installed
> > on the engine. That
> > means that the only one I don't have is the very
> > bottom one that connects to
> > the radiator mounting stud and goes up to the front
> > bumper skin.
> >
> > I can easily make the bottom piece and install it,
> > but somehow I have a
> > feeling this won't entirely cure the problem. Of
> > course, I expect the turbo
> > to run a bit warmer given the added heat from the
> > turbocharger and the
> > location of the oil cooler (fairly big Setrab placed
> > in front of the lower
> > 1/4 of the radiator)... Any ideas? I did some
> > archive searching and it
> > seems like the stock 4kq radiator_should_be adequate
> > in this application...
>I'd try moving the oil cooler away from the radiator.
>When I upgraded mine, my whole car ran cooler which
>showed how much work it really does. I'd bet your
>just transfering oil heat into the radiator. The
>stock radiator is OK for street, but I'd at least
>recommend re-coring it with a high efficiency core, or
>getting an aluminum one for track use.
>Glad to hear the car is running better!
>Jim Green
>'89 90tq 034EFI, Haltech IG5
>Do you Yahoo!?
>The New Yahoo! Search - Faster. Easier. Bingo.

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