All Things Mk5 > Performance Modifications
The ultimate Dyno Graph thread
shark_90:
Because the DSG can reduce torque. Testing identical 2.0TSI software back to back shows that the DSG car has the strange shape early on, yet it's manual counterpart doesn't. Secondly the torque output of the manual car is 10+% higher.
daz_pd:
hmmm, I guess Ill get my Mechanic to do some logs with me, would slip on the RR cause this symptom?
PDT:
Wheel spin can cause issues with spikes/dips depending on the type of dyno used (inertia/coastdown/eddy braked) all measure flywheel power in different ways.
Ask the dyno operator to plot rpm vs mph, should be a smooth straight line, any spikes/dips is clutch slip or wheel spin.
AwesomeHassan:
Hello people,
My vehicle Gti Edition 30
R-tech-Nick:
--- Quote from: daz_pd on November 23, 2011, 05:44:44 pm ---hmmm, I guess Ill get my Mechanic to do some logs with me, would slip on the RR cause this symptom?
--- End quote ---
Could be a number of things / combination of things. A good logging session on the road and dyno will help pin point whats going on.
1) I get graphs like this when my back straps are not tight enough and the tyres lose contact with the rear roller drum of the dyno????
2)It the map and its running an agressive N75 pilot map which causes the boost to over shoot the target load the cut back quite hard, and not ramp up to the requested boost line, (its not a bad map just a method used by some tuners to get the boost in strong and early) On the road this mapping method would see 2/3psi overshoot and the spike/dip would not be felt.
3) Rolling road dyno acceleration rates. If tested on a dyno with little load or a fast acceleration rate then the due to the map characteristics of the N75 Pilot map (used for spooling) then it can induce a much bigger spike. Run it on a dyno with very slow acceleration rate then the peak would be much less.
IMO all that count is that your happy with how the car feels, IMO rolling roads should be used as tools.
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