Re: 5ktq Problems

[gerard@dockside.co.za]

>> 2) No BOOST.  I mean NO Boost.  Floored in 2nd you see 1.0
>> Bar and dont feel a surge of the TUrbo coming on.  It
>> reads 1.1 BAR sometimes in 3rd.

Check intercooler to throttle body hose underside for tears.
Remove cap from wastegate and see if diaphragm edge is still
in tact and check to see if wastegate slides and moves
properly. Check WOT switch on throttle body. Perhaps
also have a look at the hose going into the turbo
front-end and the hose going to the intercooler inlet.
I'm not sure about things like intercooler endcaps.
Also check those hoses running into the wastegate
frequency valve (behind wastegate, located on firewall,
looks like a metal funnel with 3 hoses and a 2-wire
plug connected to it), at one point mine were like
powder, but I replaced them with Goodyear fuel line and
got some boost assist back.

I checked out a 1992 Audi 200 automatic during december,
was thinking of buying it to replace my current 200.
The thing only gave 1.2 bar max when I first drove it.
It also ran hot and had major buzzing from the fuel tank.
I then had the guy give it to me for 2 days and the more
I drove it the worse the boost became until it maxed out
at 1.0 bar. Excellent body on the car, fantastic interior,
but the engine sucked.

BTW, anyone know if a dying fuel pump would cause boost
problems? Just curious.

> just a niggling point, but that is boost - in a n/a machine
> floored in second will get you serious vacuum, fraction of
> a bar.  1.0 bar just isn't as much boost as it should get.

> I was gonna say "wastegate stuck open" until I realised
> this.  Whne I sold my old 5kt the wg was stuck open. 
> Whatta dog!  Stuck shut is almost as bad... can't floor it
> at all!

Oh yeah, stuck shut is bad. My wastegate has no diaphragm
right now, but I still run the hoses from the frequency
valve. As far as I understand it the missing diaphragm
means air normally destined to push the wastegate open
is now helping to push it shut which should mean it is
stuck. Can't give more than 1/2 - 3/4 throttle before
1.6 comes up on the gauge. And that is not a performancy
1.6, it is the kind of 1.6 the ECU thinks is too much
for that RPM so I guess timing must be backed off quite
severely at those points. Also, give a little more gas
at times and all I hear is shudders from the engine
and exhaust (major timing retard if boost not controllable
by engine?!? I think that's the way those tables work in
the ECU).

G.

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