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View Full Version : RPM surge at high speeds?



streamline
11-28-2006, 10:26 AM
I got a APR flash last month in my 2001 a4. I was on the turnpike last weekend, and i noticed something weird. When i started accelerating over 80 mph, i would get a quick rpm surge, to the point where i would almost redline at 90-95 when i would release of the gas it would snap back down to 4K. I have a manual but when i got of the gas it felt similar to when you are hard on a auto and it upshifts. It is really strange, any ideas? This didnt happen b4 the flash, have you heard of anything like this b4?

maxspeed
11-28-2006, 11:22 AM
thats called a slipping clutch.

MultiAudis
11-28-2006, 11:28 AM
yeah sounds like a slipping clutch to me as well

SoFresh
11-28-2006, 11:56 AM
damn, thats not a cheap RPM slippage fix....

streamline
11-28-2006, 12:00 PM
slipping in 5th gear?

johnnybravoa4
11-28-2006, 12:02 PM
yea.. what kind of clutch do you have and how many miles on it

sandnessmj
11-28-2006, 12:04 PM
You're more prone to slip in the higher gears at higher speeds, because your engine is making more power, and it takes more power to spin the wheels. Think about it - in first, the gearing makes it easier to turn the wheels, so they do. When you're in 5th, it's easier for the clutch to lose grip than it is for the wheels...

Most times, this is how clutch issues will manifest themselves when it's on the way out.

Don Supreme
11-28-2006, 12:12 PM
^^ More engine load in higher gears.

JMG
11-28-2006, 12:23 PM
quickest fix is to de-glaze your clutch. Just get into midrange rpms in 3rd then downshift to 2 without rev matching. Let the car engine-brake. Do this a few times and it de-glazes the clutch. Depending on how old your clutch is, if will probably last for quite awhile unless you are dropping out of gears.

The reason you are starting to slip is that the APR flash is pushing the power limits of your clutch.

nopistons
11-28-2006, 12:27 PM
deff a slipping clutch, my vrt was doing this after about a week of driving it with the turbo kit on the stock clutch. its probably not the answer you wanted to hear but its deff a worth while upgrade if you plan on upgrading your turbo in the future

johnnybravoa4
11-28-2006, 12:40 PM
Originally posted by JMG
quickest fix is to de-glaze your clutch. Just get into midrange rpms in 3rd then downshift to 2 without rev matching. Let the car engine-brake. Do this a few times and it de-glazes the clutch. Depending on how old your clutch is, if will probably last for quite awhile unless you are dropping out of gears.

The reason you are starting to slip is that the APR flash is pushing the power limits of your clutch.

my spec stage 2 clutch is all glazzed, i was told to drive it for a while like a sissy, think i might give this a shot

sandnessmj
11-28-2006, 12:44 PM
Originally posted by JMG
quickest fix is to de-glaze your clutch. Just get into midrange rpms in 3rd then downshift to 2 without rev matching. Let the car engine-brake. Do this a few times and it de-glazes the clutch. Depending on how old your clutch is, if will probably last for quite awhile unless you are dropping out of gears.


So what's the deal with this method...is it just applying friction in the opposite rotational direction? "Rubbing the cat the wrong way" so to speak?

streamline
11-28-2006, 01:24 PM
its a stock clutch with 67K on it, it should last longer than that shouldn't it?

maxspeed
11-28-2006, 03:14 PM
depends on how good you drive, and how you drive

streamline
11-28-2006, 04:55 PM
Im the best driver there is, aren't we all :)

sandnessmj
11-28-2006, 05:00 PM
Have you had your car since new? Some people like to ride the clutch, which can significantly reduce the lifespan...

streamline
11-28-2006, 05:17 PM
no i bought it with just under 20K on it, so i guess anything is possible.

What is a typical lifespan of a clutch treated well?

CaSp3r9
11-28-2006, 05:26 PM
My stock clutch lasted me till 120k and only slipped once or twice in 5th gear when I got on it. My car has been running APR software for 6 years now.

maxspeed
11-28-2006, 06:47 PM
my dad has 160k miles on his stock clutch in his TT, stage III since 50k...

he dosent baby the car, he just dosent dump the clutch on a regular basis(ever)...