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Old 05-22-2009, 05:23 PM   #1
Scooby Specialist
Member#: 24464
Join Date: Sep 2002
Chapter/Region: MWSOC
Location: Cincinnasti
2007 WRX STi (SWP)
Surgeline Tuned

Default Old School: Zeron 880 Rally Computer

Going rallying next weekend and we are running a TSD (Time Speed Distance) in class A (equipped).

Equipped means using a rally computer to keep track of time and distance very accurately. Our weapon of choice is a Zeron 880 from the early 1980s. It's a rugged unit and though it looks a little "steampunk" today, it still works perfectly.

To get a speed signal, the Zeron needs some magnets on a part of the drivetrain that spins faster in direct relation to speed. We chose the driver's side CV joint since that wheel is less often spinning in a ditch. Two magnets are epoxied on with south poles facing out and a Hall effect trigger reads their passing.

In the cockpit the main unit is mounted where the glovebox normally resides. We removed the box to help cool the main transistor on the Zeron's backplane.

A driver's display is mounted on the steering column so I can see how many hundredths of a minute we're ahead or behind official rally time. The goal being to hit every checkpoint on time and get a zero for that leg.

The rally begins at 6PM and will probably finish after dark. Should be a blast!

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Last edited by SonicWRX; 05-22-2009 at 11:10 PM.
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Old 05-22-2009, 10:59 PM   #2
Scooby Newbie
Member#: 206414
Join Date: Mar 2009
Chapter/Region: E. Canada
Location: Niagara Region, Canada
2009 STI


That's really cool. I really need to try a TSD event.
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