Go Back   Rotary Car Club > Tech Discussion > Transmission / Differential

Reply
 
Thread Tools Display Modes
Old 12-05-2013, 09:49 AM   #1
infernosg
IT'S ALIVE!
 
infernosg's Avatar
 
Join Date: Dec 2009
Location: Richmond, VA
Posts: 811
Rep Power: 16
infernosg is on a distinguished road
Quote:
Originally Posted by C. Ludwig View Post
The FD and Miata trans senders use a VR sensor. If one swaps to the NA trans it would work with an A/D converter.

There is nothing really better about a Hall sensor. VR sensors generally are preferred for something like wheelspeed where there is a high resolution target. Just need an A/D converter for your gauge and ECU that want to see a square-wave input.
I'd love to get my hands on a Miata VSS. The N/A RX-7 transmission is nearly identical to NA and non-Mazdaspeed NB Miata transmissions (I have the Miata guts in my transmission to prove it) so I imagine it would bolt right in.

I forgot all about the A/D converter. The speedometer I have says it can use a signal from either a VR or Hall effect sensor as long as the signal is 3V peak-peak. I'm sure the VR input would be slightly irratic if not wired absolutely perfectly so the A/D converter is probably a good idea nonetheless.

Quote:
Originally Posted by TitaniumTT View Post
I believe its called Speedometer solutions in MN or WI or somewhere around there. They have a unit (or they did anyway) that will thread into the tranny where the cable did. It outputs a hall effect signal that just about any aftermkt speedometer will read an interpret. Cost when I bought it some 7+ years ago was like $75. Worked really well for me until I went full traction control and needed inputs from all 4 wheels. This option will give you driveshaft speed which will get interpreted as speed.... not useful at all for traction control.
I did a quick search on the other forums and found a few hits. Latest seemed to be from 2010 and the mentioned cost was ~$100. Considering that's less than a new Miata VSS or a used ABS hub and it wouldn't require a A/D converter it's worth a call. Do you have any pictures of the unit you had or any knowledge of the pulses/revolution?
infernosg is offline   Reply With Quote
Old 12-06-2013, 08:47 AM   #2
infernosg
IT'S ALIVE!
 
infernosg's Avatar
 
Join Date: Dec 2009
Location: Richmond, VA
Posts: 811
Rep Power: 16
infernosg is on a distinguished road
Quote:
Originally Posted by infernosg View Post
I did a quick search on the other forums and found a few hits. Latest seemed to be from 2010 and the mentioned cost was ~$100. Considering that's less than a new Miata VSS or a used ABS hub and it wouldn't require a A/D converter it's worth a call. Do you have any pictures of the unit you had or any knowledge of the pulses/revolution?
In case anyone is curious I spoke with Speedometer Solutions yesterday and they still offer the converter. It attaches right to the stock mechanical speedometer driven gear housing and generates a digital square wave signal with 16 pulses per revolution. Three-wire hookup: switched 12V power (red), ground (black), and signal output (white). $98.50:

infernosg is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:29 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Hosted by www.GotPlacement.com