4ktq on the cheap (was Coupe GT Turbo Conversion)

[Ben Swann]

Thanks Eliott,

I forgot to mention a detail - the engines I have are mostly stock 4kq
engines, KX or JT I think from '85 4kq and one Quantum motor.   I also have
a 2.3NF block, but I think the compression would be too high.

This would be something in the future, but it would be nice if I could
pretty much bolt the MC stuff on the stock 4kq engine.  I don't care if I
blow the motor as I've got more, and I've been trying to blow it anyway but
it won't die.

I have 2 MC-1 K26 turbos sitting in my garage, a couple of manifolds(need
brazing) and a downpipe(from '86 manual 5kt).  All I need is the wastegate
and an Intercooler and some of the turbo oil and cooling lines.]

Ben

On Wednesday, November 06, 2002 4:49 PM, EBavely
[SMTP:veetesse at hotmail.com] wrote:
> Ben.
>
> > Can the MC manifold and downpipe be used, or does some other
> > manifold downpipe combo needed?
>
> Yes, you can use the MC manifold for sure to bolt up to the K26 (stock)
or
> the K24 used on the later cars.  You can use the MC downpipe if you cut
it
> just after the "Y" for the wastegate.  You'll have to fab in a connector
> pipe from the downpipe to the rest of the exhaust.  If you want to use
the
> MC dp in its entirety, you have to beat in the passenger footwell a
little
> so it'll clear.  Some say that the MC dp from a manual trans car fits
> without modification, but I didn't try since mine came from an automatic.
>
> Or... you could just use the UrQ downpipe that would fit perfectly for
your
> application.  It's bigger diameter and supposedly is a better design, but
> that's more cash.  I think Mr. Semple wants about $175 for a used one.
>
> > What are the major caveats of the swap? eg. something about a tie rod
end,
> > fitment problems, etc.
>
> The bent pass. tie rod is used to clear the wastegate.  I got one from 2
> Bennet and paid $100 for it.  If on a budget, you could possibly try to
bend
> it yourself, but it might take some time to get it right.  A UrQ tie rod
for
> that side is also a possibility.  For my money and time, I just got the
2B
> one...
>
> People say that you can get by with the stock CIS-E of the coupe or 4kq
if
> you keep the boost low enough, otherwise you'll have to got with swapping
> the engine wiring and electronics of the 5kt.  Good documentation is
> available and if you're better than me with wiring, you should have no
> problem.  It is kind of trying though to get it all worked out.  I bought
> mine as a kit so I didn't have to pull the "red" harness from the donor
car
> which I hear is very difficult.
>
> You also need to move your battery to the trunk... not a huge problem
since
> a relo kit from Summit is $40, it cleans up the engine bay and also
shifts
> weight towards the back of the car.
>
> An oil cooler will help things... using the stock one is usable as long
as
> you don't go crazy with the intercooler and want to put that where the
oil
> cooler would go.  I chose to get a Setrab and put it on the other side of
> the car.
>
> If you use the 5kt air box and metering head, you'll have to cut up the
> inside of the fender to make it all fit.... I was fortunate enough to
find
> some Urq parts that let me skip that part....
>
> I'm sure there's some other things I'm forgetting....  In general the
major
> caveats are proportionate with how much cash you can devote to the
project.
> I wanted to do a semi-simple conversion at first, but that turned into
full
> blown rebuild, new clutch, custom parts, UrQ bits and the like.  I have
more
> money into it than I'd like to admit.
>
> >I'm not looking for over the 220HP you can get with
> > a chip, as that would be outrageaous enough, especially since this car
is
> > just a beater anyway.
>
> Sure, you can do the basic swap like Mike Gough did and just change the
> manifolds and add the turbo in one weekend.  He didn't even pull the
motor,
> I think.  Eventually, he went further and went to EFI, but initially, he
did
> only the manifolds and it worked....
>
> >For that matter, I could even delete the intercooler
> > for the "rough draft",
>
> That's what I did... see the pics.  With the 5kt donor parts from the
> complete intake, it's easy to do.
>
> >or maybe the fact that the AC is already removed
> > from the car, would help.  The car was a stripped out rally car in its
> > previous life.
>
> Cool!  Actually, I don't think you can run a/c on the 4ktq conversions
> without some serious doings, so most projects begin with yanking all that
> stuff along with the stock motor.
>
> Be sure to do the removable core support mod though... I can't say enough
> about how much time that saves you with the whole process...
>
> It is fun to do the project... I'd recommend it.  The general sentiment
is
> that you end up with a car that Audi *should* have built in the first
place.
> A CGT turbo would be even better since it'd be lighter....might need a
> Quaiffe though to control the wheel spin...
>
> Best of luck... Let me know if I can help in any other way.
>
> Elliott