Cure for "rev hang"?

[jonwoods]

I searched high and low but I can't find anything that works.

Anybody have any luck getting rid of the hanging revs when cornering? Every single time I accelerate out of a turn in 1st, the engine speed does not drop rpm on the 1-2 shift - or more correctly, it drops off only very very slowly. It only does this when you clutch in while experiencing significant lateral acelleration - never in a straight line. The clutch is definitely fully disengaged. This really upsets the balance of the car when you release the clutch in 2nd and I can't imagine why Audi does it. Haven't found enough corner to try this with the 2-3 shift yet.

Other threads have talked about using dynamic mode and or turning off the nannies, but it still happens. Perhaps you have to turn the nannies full off? Is that even possible? My trust in this cars chassis to keep me out of the ditch without software intervention is still pretty low sadly...

2011 6mt with Sport Diff...

[Thurston]

I'm not positive as to what you're referencing regarding the "Rev hang" but have you read about the delay valve in the 6mt cars? Seems many report the 1-2 shift is much improved upon replacing w ss lines.

[Atzek333]

my s4 with stronic does this also .... stock and also with tune

[infinkc]

When I went lw flywheel it helped out a ton with this.

[Antekaudi]

I experience the same thing, it almost feels like the clutch is slipping (gas all the way in and rpms stay about constant)

I have experienced that in higher gears as well whenever i rapidly shift from one gear to another.

For now i just give it a split second before flooring it after shift change. This whole thing might be due to the delay in the clutch engagement (i am not sure).

Thanks

[jimrobbington]

I know exactly what you are talking about. It's almost like the car hits the gas on its own through your 1-2 shift, but not all the time. I have JHM Stage 3 clutch with LWFW, and it helped a ton with your normal "rev hang ", but this still happens from time to time. You say this only happens when cornering? I'll have to pay more attention to this to confirm. It's annoying, but only bothers me when I'm half throttle and it happens, makes for an unexpectedly rough shift. It's great when it occurs during WOT, which is where I can see why they might have done it on purpose for performance, but at part throttle, it shouldn't still happen. I drive in dynamic at all times, maybe it's a dynamic thing?

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[SouthernBoy]

Some years ago I had a car that did this much too much, in my opinion. I used to installed a restrictive homemade piece of metal in an air bypass tube and it helped... for a few days. Then I found out why the car did this. It was a designed in "feature" to help burn off any fuel that happened to puddle in the intake manifold or runners when the throttle valve was suddenly closed as an aid in keeping the engine emissions friendly.

Well of course, the S4 won't have this problem because it makes use of direct injection so no fuel can puddle anywhere outside of the cylinders. So I can't imagine why Audi might design this in but if the engine is hanging between shifts, it wouldn't be the fault of the clutch assembly... unless the delay valve is maintain friction on disengagement. This could take place but if it is the culprit, I don't think t would matter whether the car was in a tight turn or in a straight line.

[jimrobbington]

I have delay valve removed with usp ss line, so that has nothing to do with it. I do feel like it's in the tuning. Maybe going stage 1 would fix this? New excuse to tell the wife...

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[nkh79]

I notice this from time to time. My B6 S4 did it as well. I remember a while back reading something about it being an emissions thing and that other VAG cars do it as well. Haven't found a way to turn it off, but I haven't really looked that hard either. I just try to remember that it's there and not shift when turning. Sometimes I forget and probably look like a noob at driving stick, though. :)

[jsh139]

I feel like I remember reading something about the ECU map being responsible for this. Maybe one of the tuners will chime in.

[acaudi]

I absolutely can't stand the rev hang. Only happens when turning during hard acceleration. I've been told it's related to the flywheel but why only during turning?

[jimrobbington]

I absolutely can't stand the rev hang. Only happens when turning during hard acceleration. I've been told it's related to the flywheel but why only during turning?

This isn't done by the flywheel. This is something different. Is it similar to using AC requires additional load on the engine? Maybe when the sport different is fully active during this hard cornering, it needs the engine to keep up with the demand from the diff? I'm Just spit balling here....

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[mmm def]

I'm pretty sure the ecu is holding the Revs up in a turn. Has nothin to do with the fw. Could it be a safety thing where one might need to get back on the gas quickly and just needs to pop the clutch and go? I don't know but it's annoying.

[Ze_Nardo6]

Mine does this from time to time as well. I have the SS line and a stage 3 clutch with LWFW...I think it may just be inherent with these cars.

[Dr GP]

I first reported this with my 6MT back in 2010. I have had 2 more 6MT S4s since then. They all have the rpms hang up when shifting and turning at the same time. Doesn't have to be 1/2 shift. I have learned to live with it.

[KRp220]

I experience the same thing, it almost feels like the clutch is slipping (gas all the way in and rpms stay about constant)

I have experienced that in higher gears as well whenever i rapidly shift from one gear to another.

For now i just give it a split second before flooring it after shift change. This whole thing might be due to the delay in the clutch engagement (i am not sure).

Thanks

i've had the exact same thing happen to me. It actually happened when i was at the dragway and it completely jacked up my run

[Pumpkinkiller]

I had a similar issue with my b7 A4 and turns out one of the clutch pedal switches was bad.... does your cruise control work? That was a sign my switch was bad cruise didn't work.

[B8Addict]

Same in my car as well. Rev hang in general but its terrible when cornering.. I just end up shifting before the turn or directly afterwards once the car is straightened out.

[doughboy17]

Does the car try to rev match via the computer?

[MrFunk]

I'm pretty sure the ecu is holding the Revs up in a turn. Has nothin to do with the fw. Could it be a safety thing where one might need to get back on the gas quickly and just needs to pop the clutch and go? I don't know but it's annoying.

I agree that it's probably a safety feature. Keeping revs up in 1st gear in a turn probably reduces the car from being unsettled in a turn (high engine braking in 1st gear when letting off gas) if you were to let off the gas in 1st gear while turning.

I just hold 1st gear longer in those types of turns vs short shifting mid turn.

[jonwoods]

Thanks for the replies. I'm guessing this is part of the stability control system given that it appears to be related to lateral acelleration.

Holding first longer isn't possible - happens as you acelleration off the apex and need another gear (ie: a left turn from a standing start)

It's not tying to rev match, the ecu just holds the throttle open for some reason only known to some engineer deep in the bowels of Audi hq it seems.

This must drive guys who track these cars nuts if it happens on the 2-3 shift too. I thought I was accidentally keeping my foot on the throttle until one day I sat there with the clutch in and my foot off the gas and watched as it took about 10 seconds to drop from 6000rpm to idle.

It's almost like this car doesn't want me to drive like a hooligan - or at least it's trying to get me to limit most of my hooning to straight lines.

[jimrobbington]

Thanks for the replies. I'm guessing this is part of the stability control system given that it appears to be related to lateral acelleration.

Holding first longer isn't possible - happens as you acelleration off the apex and need another gear (ie: a left turn from a standing start)

It's not tying to rev match, the ecu just holds the throttle open for some reason only known to some engineer deep in the bowels of Audi hq it seems.

This must drive guys who track these cars nuts if it happens on the 2-3 shift too. I thought I was accidentally keeping my foot on the throttle until one day I sat there with the clutch in and my foot off the gas and watched as it took about 10 seconds to drop from 6000rpm to idle.

It's almost like this car doesn't want me to drive like a hooligan - or at least it's trying to get me to limit most of my hooning to straight lines.

I've confirmed this is coded out with 034 software! I no longer experience Rev hang through a turn with stage 1.

[B8Addict]

I've confirmed this is coded out with 034 software! I no longer experience Rev hang through a turn with stage 1.

Awesome. I wanted to know if anyone has a clue on why I would be getting rev hang but it only becomes an issue if I am in stop and go traffic. Takes about a second to shift from 1-2 shifting at 3000RPM. The car does not exhibit this issue when the car is still cold or during commutes with little stop and go traffic. Super frustrating.