All Things Mk5 > Performance Modifications
Motech mapped DSG 'hesitation' after gear change - FIXED. R-TECH Reign supreme
john a:
The logging runs suggest the car is OK. A much more knowledgable person that I has suggested that a different intake may smooth things out a little but I am unconvinced that there is not something in the map causing the dip, which I can feel on the road as well as is apparent plotted on the graph. I am awaiting a response from Motech but hopefully this can be resolved quickly like the OP's issue.
R-tech-Nick:
--- Quote from: john a on April 12, 2012, 08:20:14 am ---The logging runs suggest the car is OK. A much more knowledgable person that I has suggested that a different intake may smooth things out a little but I am unconvinced that there is not something in the map causing the dip, which I can feel on the road as well as is apparent plotted on the graph. I am awaiting a response from Motech but hopefully this can be resolved quickly like the OP's issue.
--- End quote ---
The dyno graph will show whats going on on the road, some dyno operators use very high graph filters to smooth the plots out to make the curve "look" good and give higher number. I know dynodaze use a very low graph filter as there task is just to show the customer the power output and a true plot of what the car is doing.
john a:
Understood, so would you expect some small peaks like the graph shows or would you expect it to be dead smooth?
An excerpt of a log below, does show the torque drops off fairly readily. Get your specs out, helps if you open the image and then zoom in a bit.
Log by jonnyguitar, on Flickr
R-tech-Nick:
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
Top Cat:
--- 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:
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