The ultimate Dyno Graph thread

[PDT]

Do you notice the spike whilst driving?

[heavyd]

The dsg boxes seem to cause a lot of headaches
Hopefully I'll have a dyno plot of the stage 1 map next week to put up on here, I have the dsg software, so will see if I get the spike on mine

[daz_pd]

The spike is down to the DSG, we've seen it on our dyno too. The manual version on 100% identical map doesn't do that, it's a smooth torque curve. We did a DSG remap on that car in order to solve it but unfortunately the customer didn't have time to wait for us to re-run the car. He is coming back for other work though, so we will have the opportunity to dyno it.

Do you notice the spike whilst driving?

@ Shark_90 thats interesting, although slight issue being that I dont have DSG, lol! any other thoughts?

@ PDT: Its not THAT noticeable, If I look for it its easy to find however, feels kinda like hesitation for a split sec then the spike before it continues nicely throughout the range,

[shark_90]

@ Shark_90 thats interesting, although slight issue being that I dont have DSG, lol! any other thoughts?

Haha! Ok, in that case I don't have any thoughts off the top of my head, I've never seen a manual do that apart from one that had a persistent misfire which was down to a weak coil pack. That doesn't look like a misfire to me but the resolution of the graph isn't really high enough to spot that.

[rich83]

Why would the DSG box cause a big torque spike?

[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]

hmmm, I guess Ill get my Mechanic to do some logs with me, would slip on the RR cause this symptom?

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.

[ni-coilovers.co.uk]

Thought I would fire up the Stage 2 K03 - Bluflame Decat downpipe and neuspeed p-flo….. 

[antoś]

Hello!

here is dyno of my Golf GTI mkV AXX.

Modifications:
- k04 turbo
- S3 Intercooler
- DownPipe without catalityc converters (rest of the exhaust is stock)

Result:


It's important to mention that intake is OEM, injectors are stock and hpfp is stock. :)

All tweaks were made in Poland - CompSport ;) http://www.compsport.pl/ - only in Polish, however in "Projekty" section you will find some projects. :)

[Duke]

Hi all,

I had my MK5 GTi on the rolling road a few months ago and it gave more power than expected. I was with a group of different cars and they had the expected results, so as far as I know the result should be accurate (as can be). I've not modded or chipped the car so either the previous owner has or someone told me some models had a newer engine in which was 30bhp up?



Any ideas? Not complaining of course 

[damoegan]

Wheel HP is about right but fly HP is a little high, also to low to be mapped too..

[Shorty]

AwesomeHassan - Whats the spec of your car dude? Have seen it at Awesome a few times! Looks lovely.