Mk6 Golf Acceleration & Performance Data

[BezzyR]

There's a drag strip in melb? I would be curious to know what my stocker would do

And Heathcote if you can be bothered going the distance.. Due to Melbournes crap weather Calder is always getting postponed

Let me know when you head out though Fabolia! ;p

[Fab_R]

Let me know when you head out though Fabolia! ;p

Hahahah, no worries will do old mate BezzyR

[TRGTI]

maybe when the weather is better we can organise a vw/audi drag meet?
i've been wanting to take my car down for aaages but i always get there to late.

[REXman]

Well explained.
Wow thats a pretty serious difference...you'd have to wonder why they are still being used these days when they are giving these sort figures compared to roller dyno's.

You know why there still used is because HUB dynos are better for more accurate tuning per RPM tuning. Particularly where the person is tuning your specific engine, they are better because they are a lot more sensitive.

I think someone mentioned this also, that the HUB dyno's don't have anywhere near as much drivetrain loss (tyres slipping/turning heavy rims around) to deal with.

This is true and the reason why they give such inflated, non realistic/ comparable figures.

Because the dyno is literally bolted onto the car you don't get any of the play associated with transferring power to the wheels, and then to the rollers on the dyno.

Which is why the HUBs are used, because they are more sensitive, and therefore more accurate, they make for better possibilities of getting a more precise tune.

But for flash tunes which aren't custom, there is no point to the HUBs. Cause all you really want is a reading at the wheels!

DynoDynamics Dyno in shootout mode all the way!!

[VW Central]

DynoDynamics Dyno in shootout mode all the way!!

don't forget in gear 4

[Beena]

Well guys, I think I've done it...

Worked out these issues in a way that will make everyone happy!
RexMan and DeanCorp - the cars are not as fast as the GTech says (sort of)
Corey_R and Fab_R - the Gtech's are accurate (and so are the VBox's!)

It's really quite simple...

Comes down to where the Gtech and PerformanceBox/VBox etc are made.

In the US (GTech) most (if not all) 0-60mph runs (like 400m runs) are done including a 1-foot rollout. It's just the done thing, goes back to their love for 1/4 mile racing I guess.

In the UK (VBox) and here we tend to do our 0-100kph runs with no rollout involved. I'm not sure how the mags do their 400m - with or without.

As such, GTechs by default include a 1-foot rollout, VBox/PerformanceBox's by default do not! This accounts for the reasonably consistent ~0.2s difference Fab was seeing in his comparison. I'd be willing to bet that if you turned the rollout on in the VBox the times would be near identical. This also explains the guys in the US getting the same figures out of each - for them it's simply normal to turn rollout on, so that's what they did with the VBox!

Fortunately, GTech allow you to see both figures. Within the PASS software there is even an option explaining why rollout is on by default.

I was out and about and did a few runs, 16.5deg ambient, 1pax, 1/2 tank fuel, bike racks on the roof as usual.

I got as follows:

Run 1 4.537s
Run 2 4.816s
Run 3 5.001s

Corrected for rollout (this value can be seen in the "400m graph" page on the Gtech)

Run 1 4.798s
Run 2 5.060s
Run 3 5.293s

Some pics of the Gtech are below showing the data. So, if we want our cars to sound faster (or we are talking to americans...) we use the rollout version! (Explains how the yanks get 0-60mph in 5.5s for the R32...)

So I think I can call my car 4.8s, with a super cold night I might get to that elusive 4.7...


photo 1 by LWACD, on Flickr


photo 3 by LWACD, on Flickr


photo 4 by LWACD, on Flickr

[Beena]

Also explains the Car & Driver results for a Mk6 GTi DSG:

Car & Driver USA
0-60mph 6.1s
1/4 mile 14.7s

Motor Mag Aus
0-62mph 6.5s
1/4 mile 14.6s

[Glennb]

Still highlights the issue that Fab-R's Stage 2 doesn't seem to be any quicker than a stage 1 though.
But for a stage 1 R to be sub 5.0s it's still damn good.

[Fab_R]

Yesterday morning ran a pretty quick time, actually the quickest time with the Vbox which was pretty damn close to one of my quickest with Gtech.

[Fab_R]

Still highlights the issue that Fab-R's Stage 2 doesn't seem to be any quicker than a stage 1 though.
But for a stage 1 R to be sub 5.0s it's still damn good.

I can tell you that Stage II is much much quicker than stage I.
Glenn i invite you to have a drive

[Fab_R]

Thanks Beena. Very good info there and explains the variation which had me baffled.

Do you know if "rollout" can be switched on them?

[Corey_R]

Thanks for the confirmation Beena. That's some great investigation. I wasn't aware that you could get the times without the rollout via the software.

It also confirms the conclusion that Racelogic, the makers of the VBOXes and PerformanceBox came to in their comparsion between the three products (Vbox, PerformanceBox, and GTech). Being from 2007, it was with the older accelerometer only versions of the GTech, but they pretty much identified that the differences in reported times were due to the differences in the roll-out.

Racelogic actually recommend the GTech for casual users, for several reasons, one of them being that it's significantly cheaper than the Racelogic Performance Box, which itself is significantly cheaper than the 'reference" VBoxes which cost thousands of dollars.

[Corey_R]

Do you know if "rollout" can be switched on them?

Yes, a 1-foot roll-out can be enabled on the RaceLogic products (the document I linked to even tells you where in the menus to enable it in the PerformanceBox).

It seems that at least in your GTech Fab, that you can change the rollout to 0 inches to "disable" it. But you may want to read the doco to fully understand the effect it has (I haven't spent enough time this morning to re-read it in detail).

[Glennb]

I'd love to mate but can't afford the outcome!
Still waiting to sell my old car so that i can get Stage 1 done.

[Fab_R]

Yes, a 1-foot roll-out can be enabled on the RaceLogic products (the document I linked to even tells you where in the menus to enable it in the PerformanceBox).

It seems that at least in your GTech Fab, that you can change the rollout to 0 inches to "disable" it. But you may want to read the doco to fully understand the effect it has (I haven't spent enough time this morning to re-read it in detail).

Thanks Corey, will have a read up on it.