[ROVERNET - UK] RE: Irregular Final Drive Still???

Netspace vmitps at netspace.net.au
Thu Feb 21 06:08:40 GMT 2008

The book figure is 31.5km/h per 1000rpm in 4th.
That is with standard tyres.

In my experience, with 175/75 it is about 31.


----- Original Message ----- 
From: "Steven Dibdin" <sdibdin at hotmail.com>
To: <rovernet at lyris.ccdata.com>
Sent: Thursday, February 21, 2008 12:09 AM
Subject: RE: [ROVERNET - UK] RE: Irregular Final Drive Still???

I have had a similar problem with my TC. I timed the mile markers at 70mph a 
couple years ago and it came out that the speedo was spot on (Who knew!). 
But I do suspect that the tachometer is reading too fast. I know that the 
diff' is the original one. Speed on speedometer matches reality. But 
tachometer shows 4500 rpm @ 70 mph top gear.

I seem to remember Vern (?) mentioning that the ratio should be somewhere 
near 3,100 rpm @ 70 mph. So I'm guessing my tacho is off. Question is: 
Adrian, how did you calibrate your tacho? Could you share you method?


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