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engine revs rise when clutched released

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21K views 16 replies 12 participants last post by  Gatoh  
#1 ·
Hi all
Had my A5 3.0 tdi for around 6 weeks now and love it
just a quick question , when i release the clutch in neutral the revs rise slightly then drop back to tickover again is this normal ?
thanks
 
#2 ·
I don't know if it's 'normal' but mine does it too.
 
#3 ·
Mine does it only when it's going to stop/start
 
#4 ·
my old one would do it occationally.
 
#5 ·
yes this rise in rpm is programmed into the ECU to lessen the clutch vibration which can be felt from low rpm's on the 3.0tdi.
It was a modification the audi done in the Software
 
#8 ·
Mine's always done it too, but I was lead to believe it's an anti-stall feature? It does it when pulling away too (with no throttle applied).

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#9 ·
With older cars you're supposed to rev-match when changing down a gear. Newer cars do this automatically. Might be related :)
 
#10 ·
i have the 2.0T engine and mine does it too and i thinks it's for making the engine harder to kill for beginers , it helps you if you haven't accelerated your car yet to move on quicker ...

I tried to start only from clutch in 1st gear and it moves really quick:)
 
#11 ·
Mine does this occasionally (2012 1.8TFSI) - seems pretty random. Note that the original question mentioned that it did it when in neutral - so I don't think this relates to reducing clutch judder or anti-stall. In fact, when in neutral, I can't really see what the point of it is at all?
 
#12 ·
Pretty sure that is the anti-stall feature. It doesn’t actually stop you stalling the car mind as I stalled mine once (mind you it was on a slight incline and on graval)!!!
 
#13 ·
I've stalled a number of times reversing onto my driveway - definitely needs my foot on the accelerator far more than the TDI ever did. That said, I'm pretty well re-tuned to the TFSI now.
 
#14 ·
Strange as I found that I stalled my car a few times when I first got it. I even stalled it coming onto my drive between the electric gates I shat myself as I knew that the gates where due to close. Even with the safety stop they still would have made a mess.
 
#15 ·
Mine's really easy to stall too... I am no mechanic but I wonder if the newer engines have tiny flywheels to help with efficiency? It's like on tickover, it's got virtually nothing behind it.

Mine also 'blips' a little as soon as you touch the gas pedal when in neutral or clutch not engaged.. it actually makes the car rock slightly! It's like it is programmed to deliver a little extra grunt in order to move off... In other words anti-stall I guess.

Being a 1.8TFSI, maybe this is more pronounced on mine as it is a relatively weedy engine compared with the bigger units!

Anyways - it's no big deal... I've learn't how not to stall it now!
 
#16 ·
My understanding is tht it's not anti-stall, it's to protect the dual mass flywheel fromthe vibrations of moving off on the idle.
regards
G
 
#17 ·
I have stalled mine a few times getting out for gates and not doing up my seat belt afterwards - when the driver seatbelt is unbuckled, the auto release on the parking brake is not working :(