Part 2 "95 MPH @ 5800 RPM"

[jason.glover@domain.elided]

Thanks to everyone who has responded. It's been an 
interesting debate.

Many digesters have mentioned the tire size issue as far 
as speed is concerned. What I'm thinking is that tire size 
is not the issue here. Actual road speed is not the issue 
either. Heck I may have been going 110 MPH in real life 
and the car was only reading 95 MPH. I doubt it because my 
pulse was too low and I'm not missing any hair off my 
head. The issue is the RPM readings on the Tachometer and 
the Speed reading on the Speedometer. The tires and the 
actual road speed comes downstream from the info coming 
out of the transmission and the engine to the gauges.

Question # 1: Were there different speedometer drive gears 
for alfa spider transmissions? Could it be I have a late 
80's tranny in my car with a drive gear set up for a 4.10 
rear end, and I have a 4.56 rear end?

Question # 2: Were there different speedometers?

Question #3: Were there different tachometers and 
different tachometer drive gears.

Obviously I need to measure the actual engine RPM with 
something known to be accurate like a tach/dwell meter, 
and I need to clock to road speed before we can really 
call B.S. on either of the gauges. Maybe I can even get on 
the chassis dyno at Western Washington University and find 
out some real data.

I'll keep you posted.

Jason Glover
'76 Spider
Bellingham, WA
--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided