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Old 01-07-2015, 02:14 PM   #1
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Default How-To: Adding VSS to 1.6 Miata

This is probably pretty obvious for quite a few of you, but it took me a couple different sources to get this done so I thought I would throw something together for spoon feeding. Joe Perez had a picture up at one point but imageshack lost it.

This works for 1.6 Miatas without Cruise or Auto trans, any other Miata should already have the VSS signal passed to the ECU. For MS3x (and some Reverant ECUs) no extra circuit is needed, for earlier Megasquirts a pull-up resistor is required. This just covers the wiring from the gauge cluster to the ECU. Read here for pull-up info.

Remove gauge hood (and then try and plastic weld the tabs your broke off)



Remove the gauges from the car



Find the screw terminal labeled RSW



Add wire to the terminal



Run the wire to where your megasquirt is





Leave some slack for when you want to pull the dash again:



Put everything back together.

Wire it into the Datalog In (or tableswitch, cam in, etc)

These settings worked well for me:


Last edited by aidandj; 01-08-2015 at 12:49 AM.
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Old 01-07-2015, 05:31 PM   #2
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Big props!

I had an input and wiring at my harness to do this, I just never got around to it.
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Old 01-07-2015, 05:36 PM   #3
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And the gear calculation settings:

Quote:
Originally Posted by Doppelganger on cr.net View Post

5 speed transmission gear ratios-

1st 3.163
2nd 1.888
3rd 1.333
4th 1.000
5th .814

6 speed gear ratios:

1st 3.760
2nd 2.269
3rd 1.645
4th 1.257
5th 1.000
6th .843

Common final drive gears:

1990-93 5-speed 4.30
1994-97 5-speed 4.10
1999-03 5-speed 4.30
1999-03 6-speed 3.909
2004-05 5-speed 4.10
2004-05 6-speed 4.10
And MS settings:



So far the gear stuff isn't working, but I have only tested over shadow dash, I'll test with tunerstudio later.
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Old 01-07-2015, 08:29 PM   #4
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Gear calculations work. You need to set the correct tire height. OP will be edited with correct screenshot.
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Old 01-07-2015, 10:53 PM   #5
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this is awesome, i had no idea you could do this. thanks aidan
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Old 01-08-2015, 12:49 AM   #6
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Quote:
Originally Posted by hi_im_sean View Post
this is awesome, i had no idea you could do this. thanks aidan
Do you still not have an MS3x? That could be an issue.
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Old 01-08-2015, 03:59 AM   #7
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This is also relevant to the Enhanced MS2, which also has a VSS input and current gear calculation.
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Old 01-08-2015, 09:42 AM   #8
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Quote:
Originally Posted by aidandj View Post

Do you still not have an MS3x? That could be an issue.
I have ms3. I think I would just need to make a 2n2222 circuit. Problem is, I think I'm out of inputs.
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Old 01-08-2015, 09:59 AM   #9
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Quote:
Originally Posted by hi_im_sean View Post
I have ms3. I think I would just need to make a 2n2222 circuit. Problem is, I think I'm out of inputs.
I think you should just get the ms3x

Rev I thought some of yours had that.
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