Re: [T3] Engine RPM at 60 MPH?

[Russ Wolfe <russw@classicvw.org>]

On Tue, 2006-02-28 at 08:58, Matthew Jones wrote:
> I recently put our FB on a dyno to see how tired the engine was before the
> rebuild. Dyno guy guessed the RPM at 60 (he didn't ask me - I had a dwell meter
> with RPM in the toolbox!) as 2500 and gave me a corresponding peak power of 43
> BHP (3311RMP,80 MPH).
> 
> So, to work it out properly, I need to know the true RPM at 60 MPH.
> 73 European spec FI fastback on stock tyres.
> 
> I found some figures, and measured the wheels:
> Wheel: 33cm radius.
> Top gear: 0.89
> Final drive: 4.12
> ... -> 2844 RPM at 60 MPH.
> 
> Is this right?
> 
> That would give me a peak power of 49 BHP, which could be right.
According to the Without Guesswork book for '71-'72:
Max cruise = 84mph @ 4220rpm
Road speed = 79mph @ 4000rpm in 4th gear
Road speed = 56mph @ 4000rpm in 3rd
             34mph @ 4000rpm in 2nd
             18mph @ 4000rpm in 1st

Does this help??

-- 
Russ Wolfe
'71 FB AT
'66 FB MT
'64 T34 (not running)
'65 T1 (not running)
'05 KIA Sorento SUV
russw@classicvw.org
http://www.classicvw.org

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