All Things Mk5 > Performance Modifications
Motech mapped DSG 'hesitation' after gear change - FIXED. R-TECH Reign supreme
R-tech-Nick:
--- Quote from: Top Cat on April 13, 2012, 10:45:05 pm ---
--- Quote from: R-tech-Nick on April 13, 2012, 09:29:42 pm ---N75 PID controller occilations is your cause dude.. :wink:
The requested ramp rate of the boost is far to low and linear for a basic 1bar tune.
KFLDIMX ( i pilot N75% control on spool up) is a little to aggressive for the profile of the LDRXN (boost/load request curve) ECU seeing 250mb of boost overshoot around 2500rpm the ecu via PID controllers http://en.wikipedia.org/wiki/PID_controller is trying to bring the boost in line. The problem is when controlling boost with around 50% DC is that the N75 is more like an on off swicth and is hard to get linear control in short period of time.
Easy fix would be set the LDRXN boost/load profile to match the actual boost by requesting the boost to spool and peak to 2250mb, Plus the ecu finds it hard to hold a flat line boost your map is 2000mb flat line which keeps N75 around that 50% mark, maybe worth going for 2080/2090mb to ride the n75 close to 60%.
I am sure Mike will find this area and cure it for you.
Nick
--- End quote ---
Makes perfect sense to me. :rolleye:
--- End quote ---
lol
Read up about PID controllers you will understand it lots better. PID controllers play a huge part in the Bosch ecus and mapping
I have a 4500 page German Bosch MED9 TFSI functions PDF which explains every thing about your ecus, If I can find a good site to share the file I will try and post it up here I makes good reading and sheds a lot of light on a lot of post remap issues.
Nick
mervman:
--- Quote from: jedi-knight83 on January 23, 2012, 02:24:59 pm ---
--- Quote from: alackofspeed on January 23, 2012, 12:31:26 pm ---To be clear the torque limit I have issue with is the post up-shift torque dwell, not the in gear element. The peak torque on a dyno run is still being modulated by the DSG gearbox (which I accept) at around 280 lb/ft.
I will draw a crude graph to show what I mean.
The reason it bugs me is that it totally negates the benefit of the DSG - I'm far from a driving legend, but the torque interuption I introduce when shifting my manaul track car is seemingly less noticeable, though I've not quantified this with a Vbox or similar. I know from driving the other day with a friend in a fairly spirited manner, that when my car changes gear he pulls on me in a way that shouldn't happen.
As I exhausted conversation (a while ago) regarding the map being the cause the torque-dwell, I don't mind disclosing that it is a Shark map on my car, as Heavyd has eluded to.
--- End quote ---
perfect graph showing the issue.
AS soon as i get my car back I'll be back at Motech trying to sort the issue.. the good thing is they also seem committed to sorting it out and are not just telling me to live with it.
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Hi guys.
Sorry for the thread resurrection, but I've been having a similar issue with my stage 2 remapped GTI.
I notice a hesitation when changing gear at wide open throttle approxmately around 3k RPM. Foot flat in second gear and if I change up to 3rd at about 3K RPM it changes gear fast but then there's a delay before the power comes back on strong. It only does this around 3-5k RPM The car still pulls hard, nothing wrong with the power I don't think.
jedi-knight83- did you finally sort it out 100%?
Thanks very much!
M
RedRobin:
--- Quote from: mervman on May 02, 2012, 02:30:22 pm ---
Hi guys.
Sorry for the thread resurrection, but I've been having a similar issue with my stage 2 remapped GTI.
I notice a hesitation when changing gear at wide open throttle approxmately around 3k RPM. Foot flat in second gear and if I change up to 3rd at about 3K RPM it changes gear fast but then there's a delay before the power comes back on strong. It only does this around 3-5k RPM The car still pulls hard, nothing wrong with the power I don't think.
--- End quote ---
....Firstly, A Very Warm Welcome to the forum (and the slippery slope of modding!), M :happy2:
What you describe sounds as if it might possibly be a fuel pump issue but only if you are remapped and have an efficient aftermarket air intake as well. I had this behaviour (but no fuel cuts) on Revo Stage 2 after fitting a Forge Twintake. An APR HPFP has solved it.
mervman:
Thanks RedRobin!
I have the stage 2 software and a 76mm decat downpipe that it requires. No intake (yet!).
There's no hesitation when changing gear higher in the rev range (above 5K or below 2K).
It's only around 3K that it happens. Almost feels like a manual shift.
jedi-knight83:
Not solved mine yet. Been so busy with work its slipped off my priority list.
Mine 'improved' after a new N75 valve and fuel filter... might have been psychological though as its still pretty noticeable at times.
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