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Racetech 2 Speed Dropping out at 55mph

Posted: Mon Apr 20, 2020 10:18 am
by N1CKY
Hi,

I recently installed a Racetech 2 for a customer, The speedo works perfectly untill 55mph when it just goes blank after that. Do you have any idea what may cause this?

Info.

Vauxhall Nova
Corsa C Front wheel speed sensor to a OEM vauxhall conditioning relay that converts the VR sensor to hall effect output. Then a pullup on the output.

Regards,
Nicky

Re: Racetech 2 Speed Dropping out at 55mph

Posted: Mon Apr 20, 2020 5:39 pm
by peterguk
I had a similar issue on my Noble.

Solution was to reduce number of rotating teeth on axle from 10 to 4. Basically frequency count became too high at 50mph ish.

Re: Racetech 2 Speed Dropping out at 55mph

Posted: Tue Apr 21, 2020 7:03 pm
by N1CKY
I had a similar issue on my Noble.

Solution was to reduce number of rotating teeth on axle from 10 to 4. Basically frequency count became too high at 50mph ish.
Hi, Thanks but that inst really a valid option as it picks up on the OEM ring on the driveshaft.. I hope theres a easier solution..

Re: Racetech 2 Speed Dropping out at 55mph

Posted: Wed Apr 22, 2020 3:08 pm
by peterguk
Get a scope and check the frequency of the hall effect output.

Re: Racetech 2 Speed Dropping out at 55mph

Posted: Thu Apr 23, 2020 7:06 pm
by N1CKY
Get a scope and check the frequency of the hall effect output.

That is the plan, But social distancing is making it pretty hard to do so at the moment. I thought id check in on here in the meantime.