Haltech and stock speedo gear
I have an 87 non-tubo and am going to running haltech with a digital dash. I know the speedo is cable driven but is there any way to modify the speedo gear so that haltech can receive an analog pulse that it can interpret as speed?
I think I've heard of people modifying them for other cars, anyone know of any write ups? While searching I found this but nothing about using a hall effect or inductive sensor. https://www.rx7club.com/1st-generati.../#post11403825 I'm thinking of taking the speedo gear down to the local machine shop and and seeing what they can do. I'm pretty sure my car doesn't have ABS so I can't tap into that system. Is there an easy way to add an ABS ring gear and sensor? Could I possibly use an electronic speedo gear off a newer car such as a rx8 or miata? |
The FC cluster outputs a pulsed VSS for the power steering and cruise control. I believe it's a GN/RD wire which can be tagged under the drivers side dash where the cruise module is/would be.
To be fair, I haven't gotten this working with my Adaptronic, but I know others have gotten it working on Megasquirt. There is a thread detailing all of this. |
the stock system is trans-> speedo gear thingee-> cable-> speedo-> vss output to ps and cruise control
if you want to ditch the cable the FD speedo drive is just the VSS. it'll go right into a turbo trans, and should work with the NA also. someone, like dakota digital probably also makes a box that outputs a VSS from the cable as well |
Originally Posted by j9fd3s
(Post 12358058)
if you want to ditch the cable the FD speedo drive is just the VSS. it'll go right into a turbo trans, and should work with the NA also. |
Sweet thanks guys that's what I needed! I'll grab a speedo gear off an FD.
I am ditching the stock cluster and I am going to use a tablet. Haltech has a OBD2 adapter that I can use for aftermarket Dash cluster apps like torque pro. Thanks again everyone! |
Well, I've been looking and I can't seem to find an electronic speedo gear from an FD. Does anyone know where I can source one of these? Would one off a miata work too?
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who knows. buy one and try it.
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Maybe this is also an option:
https://trail-gear.com/301447-1-kits...rical-vss.html This is an adapter that you screw into the stock speedo drive where the cable normally goes. |
Originally Posted by DC5Daniel
(Post 12358053)
The FC cluster outputs a pulsed VSS for the power steering and cruise control. I believe it's a GN/RD wire which can be tagged under the drivers side dash where the cruise module is/would be.
To be fair, I haven't gotten this working with my Adaptronic, but I know others have gotten it working on Megasquirt. There is a thread detailing all of this. Do you have a link to said thread? I would like to maintain my factory cluster but have the speed readable by my Adaptronic. |
Originally Posted by MrGoodnight
(Post 12373374)
Do you have a link to said thread?
I would like to maintain my factory cluster but have the speed readable by my Adaptronic. |
Originally Posted by j9fd3s
its in the wiring diagram, the cruise control gets a speed input
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Originally Posted by j9fd3s
(Post 12373421)
its in the wiring diagram, the cruise control gets a speed input
Originally Posted by DC5Daniel
(Post 12373436)
Since this thread, I did get a cluster on my bench and learned there needs to be a pull-up present. Adaptronic VSS input configured as digital input will provide the pull-up.
Thank you guys. |
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