Danny B 0 Posted November 12, 2009 Couple of weeks ago I noticed something strange.......when I change gear at over 2k rpm as I ease of the accelerator and engage the clutch the revs momentairly rise by around 100 rpm before dropping - I've had the car for four years now and havent noticed this before. :scratch: Does this happen to anyone else, I noticed 'Wompa' has mentioned something similar in his thread which made me think of 'putting it out there' to everyone. Funny thing is I noticed my polo 1.4 does it as well. Its a VR by the way. Any thoughts ?? Quote Share this post Link to post Share on other sites
Jon_vr6 1 Posted November 12, 2009 Its normal and supposed to happen! Quote Share this post Link to post Share on other sites
Danny B 0 Posted November 12, 2009 Its normal and supposed to happen! Thank you very definitive :D ....do you know why it happens out of interest ?? Quote Share this post Link to post Share on other sites
Swompy 0 Posted November 12, 2009 Its normal and supposed to happen! Thank you very definitive :D ....do you know why it happens out of interest ??[/quote:1nlgzfy6] My gess is that when you lift off the throttle and depress the clutch, there is a slight overlap and the engine revs a little bit freely for a split second causing the revs to build slightly. I have it in my car and in my golf befor that Or could just be my bad driving :D Quote Share this post Link to post Share on other sites
andy 0 Posted November 12, 2009 Definately never heard of or noticed this, not in 100k miles of driving VR6s. Quote Share this post Link to post Share on other sites
Danny B 0 Posted November 12, 2009 Definately never heard of or noticed this, not in 100k miles of driving VR6s. Its such a small increase you really have to be looking at the needle to notice it which obviously most people dont do just before changing gear !! swoompy we cant both be bad drivers :lol: Quote Share this post Link to post Share on other sites
Swompy 0 Posted November 12, 2009 Definately never heard of or noticed this, not in 100k miles of driving VR6s. Its such a small increase you really have to be looking at the needle to notice it which obviously most people dont do just before changing gear !! swoompy we cant both be bad drivers :lol: Ya it is a very slight increase. haha you never know Quote Share this post Link to post Share on other sites
Jon_vr6 1 Posted November 12, 2009 http://the-corrado.net/.archive/forum/viewtopic.php?f=1&t=73093&p=850864&hilit=rev+rise#p850864 Quote Share this post Link to post Share on other sites
Danny B 0 Posted November 12, 2009 http://the-corrado.net/.archive/forum/viewtopic.php?f=1&t=73093&p=850864&hilit=rev+rise#p850864 uhmm its not exactly conclusive though........oh well just one of those things then. Its funny how it seems to happen to other VW's as well. Quote Share this post Link to post Share on other sites
millerman 0 Posted November 12, 2009 be watching mine tomorrow now i want to see if it happens :wink: Quote Share this post Link to post Share on other sites
Wullie 1 Posted November 13, 2009 I've noticed this with my 1.8. I put it down to the ISV taking over the idle. If you slow down in gear till the revs drop below about 700 they will rise on dipping the clutch to just over 1000 then drop back to the 750 idle speed. I'm probably totally wrong though and these are just the ravings of a geriatric idiot Quote Share this post Link to post Share on other sites
swiftkid 1 Posted November 13, 2009 could be to help slowing down with the gears, instead of dropping down the gears with the revs dropping, it just blips it to help smoother gear change? Quote Share this post Link to post Share on other sites
andy 0 Posted November 13, 2009 I've noticed this with my 1.8. I put it down to the ISV taking over the idle. If you slow down in gear till the revs drop below about 700 they will rise on dipping the clutch to just over 1000 then drop back to the 750 idle speed. I'm probably totally wrong though and these are just the ravings of a geriatric idiot Of course that will happen mate, you're trying to make the engine rotate slower than it would at idle by using the engine as a brake. You shouldn't be in gear at that rpm, of course the isv is going to want to speed things up a bit. :) Quote Share this post Link to post Share on other sites
VR6Joni 0 Posted November 13, 2009 I have noticed this, I'm fairly confident this will be down to the ISV opening up on throttle release. I can see why this frustrates some people, it's like the engine is out of sync with your right foot and seems impossible to rectify. Fly by wire cars are similar to drive but you can compensate on quick gear changes by advancing your right foot movements a touch, however with the ISV response seems slower to me. On a side note this effect is increased by a few hundred revs with forced induction or at least superchargers, I've been meaning to put a restriction in the ISV inlet for a while to try and reduce this effect. Not gonna happen for a while though as my car is back in bits :bad-words: Quote Share this post Link to post Share on other sites
peppyuk 0 Posted November 13, 2009 Its normal and supposed to happen! I assume your taking the p*&% This shouldn't happen, it's either a fault with the car or a fault with your driving! Quote Share this post Link to post Share on other sites
Jon_vr6 1 Posted November 13, 2009 OK then i will rephrase its nothing to worry about then!!! No fault codes on my car so is nothing worth rattling your brains over. Its like the clreaking noise when you press the clutch after a long drive is it anything to worry about NO! Rant over :D Quote Share this post Link to post Share on other sites
