Its a square wave
Announcement
Collapse
No announcement yet.
M60 Swap tachometer reading
Collapse
X
-
Recent Rebranding!!
Visit Garageaholic for all of your E30 Swap Needs!
E30 SM62/S62
E30 M60 V8
E30 M30 Big 6!
Check out this E36 N54 Swap Build
Instagram.com/garageaholic
Youtube.com/garageaholic
-
Dividing by 2 (for a 4cyl plug) is super simple due to just being able to use a basic flip flop, but dividing by 1.5 will take a more complicated circuit and possibly some trial and error. I would be really interested to know the frequency range used by the tach circuit. If I knew that, I could simulate it on my bench and test some things out.
Comment
-
Originally posted by OoPEZoO View PostDividing by 2 (for a 4cyl plug) is super simple due to just being able to use a basic flip flop, but dividing by 1.5 will take a more complicated circuit and possibly some trial and error. I would be really interested to know the frequency range used by the tach circuit. If I knew that, I could simulate it on my bench and test some things out.
Yeah, that's all a bit over my head. It's been years since I've messed with circuits, and there's been one too many beers between then and now, lol.
If you want to mess with it, I've got a few extra gauge clusters and stuff laying around. But I'm not sure any of that would help without having the input from the DME to measure the actual signal.
Comment
-
Have you checked if the M60 system outputs at a 4-cylinder frequency? Many V8's put out pulses at 4x, just like a 4-cylinder. Maybe all you need is a 4-cylinder coding plug on the back of the cluster.E30-LS1 aka. 357is
email us to pick up our LS1 swap guide
E30-LS1 KITS now available!!
E30LS1@gmail.com
e30ls1.com
Comment
-
Originally posted by garretvs View PostHave you checked if the M60 system outputs at a 4-cylinder frequency? Many V8's put out pulses at 4x, just like a 4-cylinder. Maybe all you need is a 4-cylinder coding plug on the back of the cluster.
Try searching with the keywords I gave earlier, they've discussed it quite a lot online..
The code-plugs shouldn't be too hard to come by. You can buy the whole instrument cluster for $20 or something anyways..- E34 M5 (x 2) -
- E30 V8 Cabrio "Kylpyamme" -
- Alpina D10 Touring #33/94 -
+
- E46 318i Touring -
- Toyota Hiace 4wd -
Comment
-
Originally posted by JGood View PostYeah, that's all a bit over my head. It's been years since I've messed with circuits, and there's been one too many beers between then and now, lol.
If you want to mess with it, I've got a few extra gauge clusters and stuff laying around. But I'm not sure any of that would help without having the input from the DME to measure the actual signal.
Where do you end up putting the circuit? I mean, does it go between the ignition coil and DME, between the DME and the cluster, between the cluster and coding plug, between the coding plug and tach??? I'm assuming it goes between the DME and the cluster, but I've never had the need to research it.
Comment
-
Originally posted by g3n0cid3 View PostHere is the cheapest way using a single flip flop circuit.
http://www.electronics-tutorials.ws/...r/count_1.html
Comment
-
Originally posted by OoPEZoO View PostWhere do you end up putting the circuit? I mean, does it go between the ignition coil and DME, between the DME and the cluster, between the cluster and coding plug, between the coding plug and tach??? I'm assuming it goes between the DME and the cluster, but I've never had the need to research it.
-RPM-signal goes from DME to coding plug (square wave)
-The frequency of the signal depends on number of cylinders you have (# of pulses per second for example)
-6cyl has 3 or 6 pulses
-4cyl has 2 or 4 pulses
-8cyl has 4 or 8 pulses
The "form" of pulses is the same, thus all you need to do is to cut out part of them.- E34 M5 (x 2) -
- E30 V8 Cabrio "Kylpyamme" -
- Alpina D10 Touring #33/94 -
+
- E46 318i Touring -
- Toyota Hiace 4wd -
Comment
-
Originally posted by mark///m3 View PostSo with this and the 4 cylinder coding plug?
but i do have a 4 cyl coding
in case your wondering on how to use
Comment
-
Originally posted by robiniscool View Postactually it doesnt matter what plug you have, theres two settings you dial up in it, one is how many cylinder your engine has and the other is how many cylinder your tach reads, it does 4, 6, 8, 10 cyl. pretty cool electronic....
but i do have a 4 cyl coding
in case your wondering on how to use
___________________
Mark
Comment
Comment