0-60 = 4 secs. but what about with different sprockets?

Tempest · Post by **Tempest** » Tue Mar 27, 2007 9:19 pm

Anyone clever with maths here?

Seems a stock Storm does 0-60 in 4 seconds. (please correct me if I'm wrong)

Now, I've dropped 1 tooth on the front sprocket (from 16 down to 15 teeth) and gone up 2 teeth on the rear (from 41 to 43 teeth)

Is it poss to do any maths to guess how much faster the 0-60 will be now?

LotusSevenMan · Post by **LotusSevenMan** » Tue Mar 27, 2007 9:49 pm

Three point six seconds approximately given equal wind resistance (which it won't be as it'll increase with the speed increase) and with the same revs, clutch bite etc.

Think about .3 is the practical figure for lowering the 0-60.

............................ I think from gearing ratio changes etc.

Tempest · Post by **Tempest** » Tue Mar 27, 2007 10:03 pm

LotusSevenMan wrote:Three point six seconds approximately given equal wind resistance (which it won't be as it'll increase with the speed increase) and with the same revs, clutch bite etc.

Think about .3 is the practical figure for lowering the 0-60.

............................ I think from gearing ratio changes etc.

I like that..... 3.6 approximate

I'm not going to try it myself as:

A: I'm no expert.
B: I don't have track burnout experience.
C: I don't want to be looking at a stopwatch whilst doing it.

and

D: I don't want to end up on my butt after lifting the front end !!!!!!

Is your calculation based on the gearing difference (only) or are we also taking into account the extra ease with which the engine can turn the easier gearing? (which I guess it VERY hard to work out)

LotusSevenMan · Post by **LotusSevenMan** » Tue Mar 27, 2007 10:45 pm

Approximate because of all the variables!!!
I cannot give an 'unload' figure for the engine so have based this on gearing changes and some known figures for my Caterham Seven who's 0-60 time at best was 4.1secs using an AP22 accelerometer. The variations can be large as said due to revs, clutch bite etc.

http://www.race-technology.com/ap22_2_82.html

Tempest · Post by **Tempest** » Tue Mar 27, 2007 11:14 pm

LotusSevenMan wrote:Approximate because of all the variables!!!
I cannot give an 'unload' figure for the engine so have based this on gearing changes and some known figures for my Caterham Seven who's 0-60 time at best was 4.1secs using an AP22 accelerometer. The variations can be large as said due to revs, clutch bite etc.

http://www.race-technology.com/ap22_2_82.html

Again thanks.
You really know your stuff

Stratman · Post by **Stratman** » Mon Apr 02, 2007 5:31 pm

Seems a stock Storm does 0-60 in 4 seconds. (please correct me if I'm wrong)

I think you are wrong. Whilst the later Storms were slower, Bike Feb 2003 said 4.1 secs. Bike April 2002 says my TDM 900 is faster at 4 secs. Like hell it is! Bike also said that they found it hard to get an accurate 0 - 60 time as they kept wheelying all the time. If they learned to ride proper like wot I do then they would have had a different result.

With open cans and a larger (2 teeth)rear sprocket, I reckon mid to low 3.5 secs is nearer, but how the hell do you know? All I know is, now I have to hold on tight and I still go "Wheeee, this is great...........) or words to that effect

LotusSevenMan · Post by **LotusSevenMan** » Mon Apr 02, 2007 10:12 pm

We haven't got open cans have we in the original equation?
So, I'm sticking with 3.6 secs, but I ain't gonna argue over 1/10th of a second!!!!!