Video from Dyno Day.....

[VXR_Daz]

I will update this as they finish uploading, but....

1) HarryOz - 768.5rwhp - VIDEO
2) CrisisJez - 204.2rwhp - VIDEO
3) kiwifraser - 306.7rwhp - VIDEO
4) willisit - 338.6rhwp - VIDEO
5) broadslide - 410.8rwhp - VIDEO
6) CrisisJez - 436.2rwhp - VIDEO
7) Nitrsoman1 - 429.8rwhp - VIDEO
8) chrispaull - 337.0rwhp - HERE

That's all folks - add reply below if you want yours posted up.

Edited by VXR_Daz on Monday 25th August 15:52

[Bonnie and Clyde]

Thanx for posting them. Never been to one of those days. What a rush. Looked like Harryoz's Ro was gonna launch off the rolling road? Do they normally do that?

[VXR_Daz]

Bonnie and Clyde said:

Thanx for posting them. Never been to one of those days. What a rush. Looked like Harryoz's Ro was gonna launch off the rolling road? Do they normally do that?

Harry's was special, it wanted to rip the whole dyno out of the ground and take it for a flight down the road!

I wouldn't normally expect it to pull that far up but I guess with that sort of power it is difficult to stop it

[Bonnie and Clyde]

What holds the car in place? Is it just the blocks on the front wheels or is it tied up in some other way. Also i see the car going up through the revs, what gear is the car in. First i would think but again i dont know. Is it reved to red line?

[Well_Fans]

car is tied in place using an assortment of heavy straps and car is run up to or very near to the redline usually in 4th gear.

[tiler]

Bonnie and Clyde said:

What holds the car in place? Is it just the blocks on the front wheels or is it tied up in some other way. Also i see the car going up through the revs, what gear is the car in. First i would think but again i dont know. Is it reved to red line?

The car is straped down at the rear. The blocks are just to stop the car jumping forward. The cars are run in 4th gear. The operator can see when the cars power is tailing off so thats when they left off the gas.

[Bonnie and Clyde]

So its run up through 1st 2nd 3rd and then the reading is taken in 4th gear. Why 4th?

[Well_Fans]

something to do with ratios but there are also arguments that dynos are only any good up to around 100mph then the error margin gets to high so in theory Monaro should be run in lower gear, in Harry's case probably first lol.

[racebreed]

Bonnie and Clyde said:

So its run up through 1st 2nd 3rd and then the reading is taken in 4th gear. Why 4th?

forth is the 1:1 gear or something like that cant remeber the exact name for it. my 200sx was third

[Bonnie and Clyde]

Well baffled now. I have to do some research i guess

[Well_Fans]

loads of past threads re dyno runs - some running to many pages with reams of documentation supporting all the different systems and ways of calculating figures. You think its complicated now just wait till you start searching!!!

[tiler]

Bonnie and Clyde said:

So its run up through 1st 2nd 3rd and then the reading is taken in 4th gear. Why 4th?

1st /2nd / 3rd gears are short gears. 4 is a 1to1 gear ratio. 5th / 6th gears are long gears. If you get my drif.

[jayrockwell]

In 4th gear (in this case with a 1:1 gear ratio), the engine makes 1 revolution for every revolution of the transmission’s output. That is the transmission ratio.

You would then multiply that by the differential ratio (3.46 for Monaro) to calculate the number of revolutions that it would require the engine for every revolution of the wheels. And that figure is in turn factored into the dyno's eventual BHP reading.

By running the car in a 1:1 trans ratio you eliminate one variable from the equation (since you cannot alter diff ratio short of pulling it out the vehicle) and your results SHOULD be more accurate.

Edited by jayrockwell on Tuesday 26th August 07:34

[Bonnie and Clyde]

WOW brain freeze. So much to take in. Keep throwing it at me. I'll learn and it'll keep me out of trouble. Could someone post a link for me so that i can read and try to understand it please?

[Mystvxr]

The 4th gear ratio on my auto trans is 1.152, what difference if any is that making to the RR result? I was lead to believe it has no affect and in fact you can run a car in 3rd on a dyno, it's the choice of the operator.

[jayrockwell]

Probably no difference at all. Nothing to worry about.

[jayrockwell]

Bonnie and Clyde said:

WOW brain freeze. So much to take in. Keep throwing it at me. I'll learn and it'll keep me out of trouble. Could someone post a link for me so that i can read and try to understand it please?

http://en.wikipedia.org/wiki/Gear_rat

Try that for a pretty straightforward account.

[Bonnie and Clyde]

jayrockwell said:

Bonnie and Clyde said:

WOW brain freeze. So much to take in. Keep throwing it at me. I'll learn and it'll keep me out of trouble. Could someone post a link for me so that i can read and try to understand it please?

http://en.wikipedia.org/wiki/Gear_rat

Try that for a pretty straightforward account.

Thankyou. That does explain a lot. Will read it all properly when i get home. Thanks again::