OK, My GTV-6 speedo says 80 MPH @ ~3600 RPM which is consistent with
the 22.14 MPH/1000 rpm (which is what the specs on the GTV-6 says as
well). BUT my GPS receiver tells me that when my speedo says that I am
doing 80 MPH, and the tach says ~3600 rpm, I'm actually doing only 72
MPH. Since the GPS is going to be more correct than a Veglia
speedometer, I tend to believe it over the Alfa instrument. Now, of
course, as you say, this is with stock wheels and tires. Now, while my
15 inch wheels are stock, my tires are X50 aspect ratio, and I don't
know what the car came with stock. Were they X50, X55 or X60? If they
were of a higher aspect ratio, then that would explain the discrepancy
between actual speed and indicated speed. Does anyone know what the
proper factory tire aspect ratio was for the 86 GTV6 - I'm in the
market for new tires and getting the proper ones would be nice. Thanks.
George Graves
'86 GTV-6 3.0 'S'
On Nov 9, 2009, at 3:43 PM, Carl R. Davis wrote:
From Alfa technical service bulletin
* 1971 - 1979: 19.71 MPH per 1000 RMP (3000 RPM = 60 MPH)
* 1980 - 1993: 22.14 MPH per 1000 RMP (2700 RPM = 60 MPH)
.. Of course this is with stock wheels and tires.
Carl Davis
Galena, Illinois, USA
750E, 750F, 101.21, 105.57, 115
--
to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi
or email "unsubscribe alfa" to [email protected]
--
to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi
or email "unsubscribe alfa" to [email protected]
