Dyno - GTI mk6 Stage 3

[parso_rex]

There was no work done on his car what so ever (as nothing was wrong), and then it magically came up with an extra 30 odd kw's. I suppose what this highlights is on a Mainline (in this case) is you can be 15% down due to dyno issues or operator error.

Sorry Guy but seriously your supposition is exactly that weird too because I just went into great detail above but in any case that's just plain incorrect -not the work carried out but the claimed magic. How would you know this without even logging the car in any way shape of form?, how would the results be so different on vastly different days on the others dynos and then likewise on ours and 'magically' on the last of 10+runs it starts to behave. It aint the dyno and it wasn't the operator(s)- I'll leave you to fill in the missing component. Is there something that throws the car into limp mode perhaps ? or even some other bit of hardware that giving things grief ? you tell me, that's where I'd be starting to look if a car I tuned started to behave like that. I let that thread die so as not to start some silly blame game which I'm pretty much over these days. It solves nothing certainly the issue was not and never was at our end.

Another basic R1 tuned R today sitting comfortably at 184kW atw so within 3~4kws of what they all achieve, perhaps its just a fluke that every single R and S3 apart from 1 sit in this range. Highly unlikely. More importantly what would be the use of such an expensive tool @ $170K if it was not accurate nor precise. A 15% range implies the above tuned car sitting anywhere between a figure of 156~ 211kW this would be completely useless as a tuning tool, even a 5% difference could really affect things.
There is so much more I could add but I'd much prefer to leave it and move on

[Guy_H]

Mark,

This turned into a Dyno hardware / operation thread when you threw out the comment:

Your not a hater...
Its a hub dyno nothing wrong with that but you have to keep the numbers in perspective and it should be specified when the figures are quoted otherwise you'll get laughed at hard.

Unfortunately Mainline dyno's really only exist in Australia & post a Mainline figure on a US forum and you will "you'll get laughed at hard".

We have hired & run Mainlines plenty of times, and we have been instructed on their use by Todd & Craig (you know, Mainline's techs who install & run them), so I do know them pretty well. I think we hold the record for running one ~ 20 hours a day for 13 days until the bearings fall out or the carriers

You are throwing out assumptions on Dynapacks, but I believe you have never actually used one yourself?

The links I posted were factual, not from me, but someone who put their own car on several dyno's (and paid their cash to do it) and that was the result they got - whether you like it or not. Nothing to do with me - I'm about 1200km's away from the whole thing.

Feel free to comment if you have data on the same car, same mods run on different dyno's - that's all I have done.

[bennjamin]

enough dyno talk guiz.

Take it to the 1/4 - 60ft times and ET/mph show the real performance vs other cars

[Tobes_WIR35]

I know nothing about specific brands of proprietary dynomometers but the engineering science behind them is basic. The fewer moving parts and less variables there are in the machine, the lower the tolerance for error.

On this basis alone, you'd have to think that a hub dyno, in principle, would have the highest accuracy and repeatability as the axle is mechanically connected to the dyno.

For each additional moving part or variable you add in, that'll have a potentially exponential effect on your margin of error.

[Tobes_WIR35]

Of course, there's also the "tight arse" factor, as in, the workshops who don't want to pay to calibrate and maintain their dyno. I'm sure they exist....

[Lazarus7]

Guy - the dyno readout was not the only problem as I mentioned to you. The revs hanging/flutter/surge or whatever you may call it still persists at low revs in D mode. I am still waiting for you to pm me that promised discounted DSG tune that "may" fix the problem.

Mark spent half a day logging/test driving/running diagnostics and helped me understand the processes involved in tuning (All free of charge of course) and not once did he try sell one of his tunes to me.

In the end I am partly to blame for my half-knowledge.

Don't know that the DSG tune will help, I had my TBE & DSG tune done the other day and whilst before it only happened very rarely it now almost happens every time I take the car for a drive!!! Gonna get in touch with Guy/Quattro as soon as I have some time to take the car down.

[058oys]

enough dyno talk guiz.

Take it to the 1/4 - 60ft times and ET/mph show the real performance vs other cars

Hi Bennjamin
best time so far is 12.6 at 114mph with 1.9 60ft