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914World.com _ 914World Garage _ Tach-y Question

Posted by: markb Feb 13 2004, 01:31 AM

Hi All! I changed out the tach in the Blue Car due to it bouncing. The spare I have doesn't bounce but it reads lower than the one originally in the car. The first one read 4k @ 80mph. The new one reads 3300 @ 80mph.

In your experiences, which is right?

It's a stock 72 1.7 with 205/60x15s. Dunlop A2's, if that matters.

Posted by: SirAndy Feb 13 2004, 01:33 AM

about 3800 @ 80 mph ...

Posted by: ArtechnikA Feb 13 2004, 02:11 AM

QUOTE(markb @ Feb 12 2004, 11:31 PM)

In your experiences, which is right?

in my experience, experience is useless in the presence of instrumentation.
find yourself a calibrated tach and see how far off the stable one is.

Posted by: vsg914 Feb 13 2004, 07:37 AM

Use the rpm setting on your dwell meter to check it. Remember that your speedo will be slightly off due to the tire size too.