Wich gear on rolling road
Posted: Sun Sep 21, 2008 2:51 pm
Is it normaly to run the car in 6. gear on a rollingroad?
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Wich gear on rolling road
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RE: Wich gear on rolling road
Posted: Sun Sep 21, 2008 5:38 pm
4th.
Posted: Sun Sep 21, 2008 8:07 pm
I thought it was generally done in the ratio that is the direct one. i.e. 1:1 so thats quite often 5th gear in a 6 speed car as the 6th is an overdrive gear for crusing. In my BMW it was done in 5th and it is a 5 speed box.
Posted: Sun Sep 21, 2008 10:39 pm
An S4 would be doing 140+ at the redline in 5th!
Posted: Sun Sep 21, 2008 10:54 pm
and you dont want it jumping off the rollers at 140!!!
Matt
Matt
Posted: Sun Sep 21, 2008 11:11 pm
Yes thats true, but my BMW is doing 170 mph at the red line and it was done in 5th gear.
Also remember that the power quoted will change depending on what gear you use as the transmission loss and general heat loss and friction is higher in higher gears. The coast down doesn't always compensate for this properly. You should always use the same gear for direct comparisons.
If your car jumps off the rollers even in 2nd gear then its going to be a write off no matter what.
Also remember that the power quoted will change depending on what gear you use as the transmission loss and general heat loss and friction is higher in higher gears. The coast down doesn't always compensate for this properly. You should always use the same gear for direct comparisons.
If your car jumps off the rollers even in 2nd gear then its going to be a write off no matter what.
Posted: Mon Sep 22, 2008 7:48 pm
Last RR i went too the runs were done in 3rd, still gets up to circa 100 mph 
Posted: Mon Sep 22, 2008 7:54 pm
Maybe not - http://www.youtube.com/watch?v=p4l-Dl73TpM&NR=1MGR wrote:If your car jumps off the rollers even in 2nd gear then its going to be a write off no matter what.
Posted: Mon Sep 22, 2008 7:57 pm
And from that, just found this clip. Hilarious!
http://www.youtube.com/watch?v=GSl-jSfn ... re=related
Poor old sod!
http://www.youtube.com/watch?v=GSl-jSfn ... re=related
Poor old sod!
Posted: Mon Sep 22, 2008 8:43 pm
Thats ace Scott.
Posted: Mon Sep 22, 2008 10:05 pm
Oh dear - I suppose that comment was meant if it was properly strapped down so it can't move, and so the only way it is coming off is if the rollers jam.Blue_Thunder wrote:Maybe not - http://www.youtube.com/watch?v=p4l-Dl73TpM&NR=1MGR wrote:If your car jumps off the rollers even in 2nd gear then its going to be a write off no matter what.
Posted: Tue Sep 23, 2008 3:08 pm
i have heard a rumour that a car that does jump will stall instantly. not sure if thats truth or not.
Posted: Tue Sep 23, 2008 4:48 pm
Here they are rolling the car in 6. gear..
Posted: Tue Sep 23, 2008 6:15 pm
4th gear