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Does anyone know why the revs on my cars "linger" when I accelerate. If accelerate quite hard to say 5-6k, the engine takes a long time to slow down making the gear change slow, otherwise it is very jerky.

What can I do to fix this?

Cheers
Will

You can fit a lightweight flywheel...this should help...but there can be drawbacks depending on which type you fit (such as a slight rattle at low revs under load)

Could this be a sign of an air leak ??? I know mine did this once and it had an air leak - a split hose which when replaced restored the rev behaviour to normal.

Was this discovered by a garage or youself and how did you identify the hose that was faulty?

It was discovered by Kim at QST doing a pressure test.

derdle wrote:Could this be a sign of an air leak ??? I know mine did this once and it had an air leak - a split hose which when replaced restored the rev behaviour to normal.

Just a further question then. What is "normal" behaviour? should the revs rise and fall quickly or is there a certain amount of "lingering" as that is the nature of the engine.

Now you ask I can't quite put my finger on it...all I know is the car behaved (as I would call) normally after the split hose was replaced! I think I first noticed a problem when gear changes were not as nice as they used to be.

The idle speed is controlled by a valve, same one that controls idle speed when air con or lights are switched on........... the valve does have a habit of gettin blocked with burnt oil deposits, it could also be the result of an incorrectly set throttle switch........... not much help I know.......

The RS4 should not do what your describing.

But if you were talking about a new style 1.6 A3 they are shocking. I swear they have set the ECU to increase the revs on pressing the clutch. This was ceratinly the case with the loaner I had over a year ago!

Could the problem be ECU related? Is there much difference in revs "drop" between a standard and modified RS4?
A trip to AMD or QST might be on the cards to discuss options.

Very unlikely its the ECU. No tuner would introduce this kind off response. Its more likely an air leak somewhere. That kind of problem can occur in any car.

This is why I recently made a post regarding my Porker having a boost leak!

I don't want to make you guys paranoid but it is always worth getting it checked, I was always 0.5 bar and when I had the ECU done it should have been double (still was 0.5) that's when I knew something was wrong! I have a meter in the car, so this gives me some indication. But if you have a boost leak you will lose a bit of power and also fuel consumption!

How do you identify where the leak is? And are there particular areas I should be looking?
The garage will be doing this but if I can point them in the right direction it might be quicker and cheaper.

911TT_STEVO wrote:This is why I recently made a post regarding my Porker having a boost leak!

bit of power and also fuel consumption!

At 80 miles to a tank round Spa, maybe I have a boost leak

simple1 wrote:

911TT_STEVO wrote:This is why I recently made a post regarding my Porker having a boost leak!

bit of power and also fuel consumption!

At 80 miles to a tank round Spa, maybe I have a boost leak

might well have after your foot wasn't lifted once!