Dyno fail. FAO: Scubascorpion

TaKeN · 28 Jan 2010 at 00:31

Bump.. I know he's about somewhere

stulid · 28 Jan 2010 at 00:37

Love watching engines fail in the dyno, you can always hear the owner of the car screaming "Noooo Fff*****k

BigglesPiP · 28 Jan 2010 at 00:55

peterattheboro said:
Why are they just standing there and not shutting down the rollers?

Nothing they can do, just gotta let it stop on its own.

Edit:
I can't see the 1st video, photobuvket just won't buffer.

TurbotH · 28 Jan 2010 at 01:23

Was hoping the car would somehow come off and ram into a wall

agw_01 · 28 Jan 2010 at 01:58

TurbotH said:
Was hoping the car would somehow come off and ram into a wall

And no doubt seriously injure the guy holding the camera... yeah, good going that

GeX · 28 Jan 2010 at 09:09

BigglesPiP said:
Edit:
I can't see the 1st video, photobuvket just won't buffer.

i had that, fired it up in IE instead of Opera and it worked ok though.

Nick1881 · 28 Jan 2010 at 09:22

That's pretty bad.

There is a video somewhere with a skyline almost jumping off the rollers.

BigglesPiP · 28 Jan 2010 at 09:27

GeX said:
i had that, fired it up in IE instead of Opera and it worked ok though.

That worked, and I am disappoint. What was so wrong with what he was doing?

stulid · 28 Jan 2010 at 09:41

There is a clip on youtube of a RWD car actually chucking out a smaller dyno behind it, the car don't move because its well strapped down, the rollers aren't.

GeX · 28 Jan 2010 at 10:03

BigglesPiP said:
That worked, and I am disappoint. What was so wrong with what he was doing?

i too was expecting more fail.

Django x2 · 28 Jan 2010 at 13:57

Lol, classic roller dragging too, to make the car appear like it's got more bhp than it really has! I hate roller companies that do this

Peerzy · 28 Jan 2010 at 14:06

Lucero said:
Lol, classic roller dragging too, to make the car appear like it's got more bhp than it really has! I hate roller companies that do this

How is that possible? Surely an engine has a peak bhp and no matter how you drive it you'll only be able to get that bhp figure? If he does manage to get higher than surely the engine is infact chucking out a high bhp figure and he's managed to get it, if only for a split second?

loltim · 28 Jan 2010 at 14:12

BigglesPiP said:
That worked, and I am disappoint. What was so wrong with what he was doing?

peterattheboro said:
Aren't you supposed to warm it up first and then when on the dyno leave it in one gear and gently increase the throttle to take an accurate measurement of the hp produced over how many revs?

Gonzo0 · 28 Jan 2010 at 14:21

I would take most rolling road readouts with a pinch of salt tbh, you will be surprised how many a very innacurate.

hurfdurf · 28 Jan 2010 at 14:24

I am wondering what the issue is here, I was waiting for either the car to fly off the rollers or the engine to go bang.

TomO · 28 Jan 2010 at 14:28

Peerzy said:
How is that possible? Surely an engine has a peak bhp and no matter how you drive it you'll only be able to get that bhp figure? If he does manage to get higher than surely the engine is infact chucking out a high bhp figure and he's managed to get it, if only for a split second?

because rollers measure power at the wheels, which cant be as easily fudged as flywheel power, for which the use a 'correction' figure for transmission losses, which can be a pretty flexible % sometimes.

Peerzy · 28 Jan 2010 at 14:31

TomO said:
because rollers measure power at the wheels, which cant be as easily fudged as flywheel power, for which the use a 'correction' figure for transmission losses, which can be a pretty flexible % sometimes.

Yeah I was aware of this, some places uses 12%, some 15% etc... however I don't see how driving on the rollers like a berk would alter this? Lucero was saying he was trying to get a better bhp figure by driving how he did, instead of how it should be done?

Nick1881 · 28 Jan 2010 at 14:39

A friend of mine had his Focus ST on a rolling road and they said it was 260bhp or something, yet his whp was way to low to make that at the fly.

Fr0dders · 28 Jan 2010 at 14:41

Peerzy said:
Yeah I was aware of this, some places uses 12%, some 15% etc... however I don't see how driving on the rollers like a berk would alter this? Lucero was saying he was trying to get a better bhp figure by driving how he did, instead of how it should be done?

the powerstation rollers dont guess a %

they measure the drag on the wheels and use this to calculate the power at the fly.

Basically you get the power at the wheels, calculate the drag on coastdown and then use this to calcuate how much power that coastdown must have lost, then add the two together to get the power at the fly figure

However i didnt see a coastdown run on that. I just saw him messing about on the rollers. Didnt look like he was trying to fudge figures.

mr_x_plosion said:
A friend of mine had his Focus ST on a rolling road and they said it was 260bhp or something, yet his whp was way to low to make that at the fly.

Powerstation rollers are generally very accurate. My standard Vectra made to within 1bhp of factory spec on them.

The power at the wheels figure is artifically low due to having 2 rollers. American dynos who quote "RWHP" (rear wheel horse power) as gospel only use the 1 roller. The powerstation ones produce an artificically low wheel horsepower figure due to this, but this is corrected on the flywheel figures as it measures that increased drag caused by 2 rollers on coastdown.

Django x2 · 28 Jan 2010 at 14:42

Peerzy said:
Yeah I was aware of this, some places uses 12%, some 15% etc... however I don't see how driving on the rollers like a berk would alter this? Lucero was saying he was trying to get a better bhp figure by driving how he did, instead of how it should be done?

Hmm, I should clarify. I wasn't necessarilry talking about how he was driving. The thing that annoyed me was that he was braking after the power run. This induces drag on the rollers and as a result amplifies the peak bhp and torque outputs.

If powerstation are dragging the rollers on the rundown, ask them to do it again without braking on the rundown, you'll be surprised at the difference.