dyno and safety

[VL Berlina 5speed]

i never thought i would see this in a video but a car acutally broke free from the chassis dyno,
so i was wondering is there any other safety prep in placed to stop this happening and what are they,


http://videos.streetfire.net/video/c...8c012d4cf2.htm

[Patrio7]

Wow I thought it would FLY off still would be scary as all hell

[sircruisealotVS]

well as you can see in the video americans use a different type of dyno than we do over here. they just have one big roller which the cars back wheel sit upon, whereas dyno's here are two smaller rollers which the wheel sits between (much better idea in my opinion).
pretty much all that keeps the car on the dyno is the fact that the rollers are spinning, which makes it very hard for the wheels to come over the top. they also strap it down with two straps to force the wheels down a bit more onto the rollers for traction and also as a safety precaution.
its pretty rare for a car to come off a dyno like that, in the video you see it still didnt come over the top of the roller (as i said, very hard to do that) but instead drifted off the side after the strap broke.....another weird thing in that video is that they didnt have a big-ass fan sitting infront of the radiator to help cool it down.

[Patrio7]

maybe it was an amature place?

[Bax]

Nasty work, sounds like its got a fair bit of power about it, then again it seems pretty stupid that they just got in and planted it.

When i got my old vl dyno'd it never even got strapped in, I got 2 wheel chocks planted under the front wheels and rear wheels were nestled between the two rollers. And it wasn't going anywhere. I think thats pretty standard practice until you get a bit more power.

And there was a fan there, just seemed to be sitting on the ground, most of the ones I've seen sit up a bit higher.

[NOGEN 3]

Always connects to media then....nothing. Press play and nothing happens ?What gives? Only happens on streetfire with me...

[Ripcell]

i dont think thats the first time its happened, some ricer did that in another movie

[Bax]

Ahh it happens all the time, I've seen supra's do it, muscle cars etc.

Streetfire doesn't work for me either, until I open it in IE.. Firefox struggles with it for some reason

[shaggerz]

It makes sense of course that there would need to be something restraining the car...

Although the rollers on the dyno do spin, they need to put up some sort of resistance in order to gauge just how hard the car is fighting to turn the roller. If its putting up resistance, then theres some force pushing the car forward against the roller presents, hence the straps.

Usually straps are fine or in the case of Bax's VL, chocks because the roller doesnt put up nearly as much resistance as the road (which is pretty much fixed in place lol) chocks are usually all thats required, except in the case of fairly high performance cars which put up a lot more of a fight against the roller and might need more restraint.

In this case, it looks like the combination of a high performance car and the dyno operator doing something WRONG in just nailing the throttle from standstill rather than getting the rollers up to speed first might have caused it to break free.

But meh... I've never had a dyno run so I don't know!