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Author Can someone help with this?
CorsAsh
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Registered: 19th Apr 02
Location: Munich
User status: Offline
27th Nov 05 at 15:00   View User's Profile U2U Member Reply With Quote
Need to know what speed a car would be doing at 7000rpm in a gear with ratio 1.53:1

Has 16" rims btw.

If anyone knows of a calculator or something (or can work it out for me) I'd be grateful
CorsAsh
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Registered: 19th Apr 02
Location: Munich
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27th Nov 05 at 18:07   View User's Profile U2U Member Reply With Quote
bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
User status: Offline
27th Nov 05 at 18:17   View User's Profile U2U Member Reply With Quote
work out rolling radius of wheels - pie x r squared

but that doesnt take the tyres into account

then take the revs and times that by gear ratio then divide by rolling radius

then change in m/s then into mph ???
RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
27th Nov 05 at 18:27   View User's Profile U2U Member Reply With Quote
93.8mph

**disclaimer: this may not be accurate as i made it up**

hope that helps
Ian
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Registered: 28th Aug 99
Location: Liverpool
User status: Offline
27th Nov 05 at 18:28   View Garage View User's Profile U2U Member Reply With Quote
You would need to know tyre size and final drive ratio on the diff.
CorsAsh
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Registered: 19th Apr 02
Location: Munich
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27th Nov 05 at 18:42   View User's Profile U2U Member Reply With Quote
It's from driving a ferrari the other day, didnt look at the speedo but I know I hit 7k in 3rd at one point, want to get an idea of how quick I was goin...

Tyres look to be a 50 profile
CorsAsh
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Registered: 19th Apr 02
Location: Munich
User status: Offline
27th Nov 05 at 18:45   View User's Profile U2U Member Reply With Quote
Ok, so here's some vitals for the 'rossa.

Final Drive 3.21:1
1st Gear Ratio 3.14:1
2nd Gear Ratio 2.01:1
3rd Gear Ratio 1.53:1
4th Gear Ratio 1.17:1
5th Gear Ratio 0.88:1

Tire Sizes

F 225/50ZR-16
R 255/50ZR-16

that help?

 
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