Audi 5000 Turbo Throttle-trouble

[Teut]

Hi All,

I have a '85 Audi 5000 turbo quattro wich has a terrible throttle response. If I give max throttle at rev's below 3500 rpm the car chokes.. The only way to accellerate fast is to give very little throttle until the car starts accelerating, and then jently push the throttle further. This way the car is very fast, so I expect I get full power, but it's very difficult to get the car to do so. I think the problem is in the K-Jetronic, but I'm not sure what to do about it..
The car allready got new filters (air, oil and fuel), and I've checked very careful for any air leaks, but I can't find any. It starts like a charm (hot and cold) and idle's just fine..
Any ideas anyone?

 

[moribundman]

If you don't get any replies here, you may want to try your luck here: http://forums.audiworld.com/v8/
That's an Audi 5000/200/V8 discussion forum. Good luck.

 

[Teut]

Thanks! I Will!

 

[k1xv]

In evaluating any responses you get from North America, take into account the fact that the European 5000 Turbo of that era had a much larger and higher boost turbo than that sold in the USA. In the USA, the maximum intake manifold pressure before the wastegate opened was only 1.4 Bar. I believe the Euro version was 2 Bar or more.

I suspect the bigger the turbocharger, the greater the susceptability to turbo lag from low rpm.

 

[Drew99GT]

2 bar is over 28 psi!! You'd have detonation so bad without race fuel with that much boost, especially from a turbo that could actually hold that much boost (ie. BIG turbo). You'd have to have a killer fuel system as well.

 

[Drew99GT]

Here yea go TC

2 bar that Audi lists takes into account atmosphere. Actual measured boost pressure on a guage is more around 16psi steady. The 1.8Ts I've been around (yes, even a new 225 HP TT)spike to around 17-19psi, then fall off to a steady 15 psi. I stand by my comment. 28 psi on 91 octane fuel is a recipe for DISASTER!!!!

Audi Boost LEVEL is NOT 2 bar as measured on an actual boost gauge

And I could rip into you with some arrogent ******ish comments like you did me, but I don't need to prop myself up like that.

 

[Drew99GT]

By the way, I know you'll come back and say, I knew that all along; bar does take into account atmospheric pressure. Most automotive boost gauges that read bar do not read in absolute pressure, just pressure above atmoshphere.

Bar/Psi boost guage.

 

[Teut]

Hi all, thanks for all the comments.
I've actually solved the problem by adding a double load of injection system cleaner to the fuel-tank.. Took about 90 k's and the problem was gone!

 

[k1xv]

Originally posted by Drew99GT:
[QB] By the way, I know you'll come back and say, I knew that all along; bar does take into account atmospheric pressure. Most automotive boost gauges that read bar do not read in absolute pressure, just pressure above atmoshphere.

========
I owned a USA Audi 5000S turbo and it had a digital manifold pressure gauge where approx 6.5 lbs of boost was digitally displayed as 1.4 bar. So I used this convention because that is the one used by Audi, and the car in question is an Audi

 

[Drew99GT]

quote:

---

Originally posted by k1xv:

Originally posted by Drew99GT:
[QB] By the way, I know you'll come back and say, I knew that all along; bar does take into account atmospheric pressure. Most automotive boost gauges that read bar do not read in absolute pressure, just pressure above atmoshphere.

========
I owned a USA Audi 5000S turbo and it had a digital manifold pressure gauge where approx 6.5 lbs of boost was digitally displayed as 1.4 bar. So I used this convention because that is the one used by Audi, and the car in question is an Audi

---

Yea, I see that Audi factory gauges read bar as absolute. I'm used to good ol psi with an aftermarket Autometer gauge.

 

[moribundman]

Hey Teut, glad you found the problem, and that it was something as simple as dirty injectors. You may also want to make sure your fuel filter isn't wicked old, as that tends to get increasingly restrictive with age.

 

[Teut]

thanks, we've only bought the car a short periode ago, and it wasn't until we took a good look under the bonnetat home that we discovered that it had suffered allmost no maintenance at all for the last period. The air-filter for example was totally clogged up. So we swapped that, together with the fuel-filter and oil, etc..

[ December 04, 2004, 04:31 AM: Message edited by: Teut ]