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Yeah, I think you are right. From the 1.8 up, the megasquirt drives the tach. On the stock 1.6, the dash tach is driven off the ignitor, the DIYPNP jumper configuration doesn't have a connection for the tach, in stock configuration at least.
I'll definitely try a resistor if I don't get a tach signal from just splicing the two together. Thanks for the heads up. |
Originally Posted by deezums
(Post 1185596)
Yeah, I think you are right. From the 1.8 up, the megasquirt drives the tach. On the stock 1.6, the dash tach is driven off the ignitor, the DIYPNP jumper configuration doesn't have a connection for the tach, in stock configuration at least.
I'll definitely try a resistor if I don't get a tach signal from just splicing the two together. Thanks for the heads up. I don't think rewiring 2I to tach out is the way to go. By connecting the black/white and the blue and yellow you are connecting the tach signal to the tach input. Then the resistor provides a pull-up that the tach needs. I would need to go over the diagrams to be sure but you might end up with some weird stuff by driving IG- with the coils (ground signal) and the ECU. Joe Perez or Braineack what do you think. I've been spending too much time with embedded code and EE knowledge is rusty. |
I looked through your thread again, are you still using toyota COPs? If so, they make a signal that replicates the one you removed in the stock ignitor. The LS2 truck coils have no tach out signal, so my megasquirt has to make the signal or there's no signal to pull up.
That's my understanding, if you wanted you could probably ditch the tach out pin of the toyota cops and drive the tach directly off the MS. I'm curious if it will be more accurate. I noticed it does very odd things under spark cut stock, obviously, I'm curious if the tach will read identical to megatune while on launch control or a flat shift, boost cut etc. Not a huge deal obviously, but I can't help but mess with stuff. I'm waiting for a trashed ignitor to finish my setup 100%, I'll be back with results no matter what. |
Originally Posted by deezums
(Post 1185643)
I looked through your thread again, are you still using toyota COPs? If so, they make a signal that replicates the one you removed in the stock ignitor. The LS2 truck coils have no tach out signal, so my megasquirt has to make the signal or there's no signal to pull up.
That's my understanding, if you wanted you could probably ditch the tach out pin of the toyota cops and drive the tach directly off the MS. |
4 Attachment(s)
My plan works, and so do my coils. Stock wires were "crimped" to fit on the thinner LS studs. I ran a flat blade screwdriver between the coil boot and wire to un-glue them so I could make them fit perfect.
https://www.miataturbo.net/attachmen...ine=1417244732 https://www.miataturbo.net/attachmen...ine=1417244732 |
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