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Discussion Starter #1
does any body know what the true speed is if an r33 gtr non vspec is when the revcounter is at 7400 rpm in top gear is the speedo reads 183 mph look for answers thanks carbonr33
 

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OK, this is what I get using the following constants:

RPM: 7400
5th Gear: 0.752
Diff: 0.411

Tyre Size 245/55/17, different size tyres will make quite a difference to the results.

I worked it out as 294KPH or 183MPH. Same as speedo reading. :)

To break 200 MPH, you would need to get the revs to 8100 RPM.

That's assuming I've worked this out right.:D
 

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:D

BTW I made a typo mistake above, tyre size should say 245/45/17. oops. :)

I think that's standard for an R33 GTR.
 

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Treu speed

If you are running on standard tyres and running gear I would expect the clocks to be out by between 5 - 10%.

Checked mine with GPS on standard running gear and tyres mine was about 6 - 7% out.

Absolutley smack on with 18s though :)

Kev
 

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True speed

I agree GPS amybe out,

However I woudl trust this more than the speedo and if both are reading the same at least you feel a littl emore comfortable. Or at least I do :D

Kev
 
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