Meagsquirt Tacho Signal

[pugpete1108 62 1 Cars]

i'm on a little winter mission to get my tacho running with my ms ecu.

 

now i understand there is a few ways to do this (modding the tacho pcb, fitting bx clocks etc.) but i would like to use the ms tacho output it was fitted with.

 

from what i can gather on the ms website it can run two types of tacho, a high voltage one (driven from the ignition coil) or a low voltage one(driven by the std ecu).

 

i guess my ph1 was originally run from the coil ve so i would say high voltage tacho??

 

so in theory this should work?:

 

 

any input would be appreciated, and appologies for going over this topic again.

 

pete

 

my bad spelling mistakes sorry

Edited December 18, 2009 by pugpete1108

[pugpete1108 62 1 Cars]

scrap that just been doing some digging and found this:

 

 

i see a little trip to maplins coming

[madspikes 41 1 Cars]

Take a look at this thread.... Tis an old one!

 

Bloody hell have I been building my car for that long!!!

 

Mad.

[DrSarty 90 1 Cars]

That diagram (stating the obvious) is for wasted spark Pete; is that what you've got?

 

This means your MS has two VB921 ignition modules fitted, correct? As standard they only have one VB921 and run one coil, and the tacho feed should come from that.

 

Just checking you don't walk into an issue.

[pugpete1108 62 1 Cars]

That diagram (stating the obvious) is for wasted spark Pete; is that what you've got?

 

This means your MS has two VB921 ignition modules fitted, correct? As standard they only have one VB921 and run one coil, and the tacho feed should come from that.

 

Just checking you don't walk into an issue.

 

yeah cheers Rich, i have two spark drivers on wasted spark in fact two nice new bosch ones as i fried the last lot

 

should that work using the 205 tacho?

[welshpug 1,652]

yup works fine on wasted spark on my MP3.1, if its sequential ignition you'd just add two more of the D2 diodes.

[Stu 18]

If, after you fit the diode pack it still doesnt work mate you'll need to remove the filtering from the rev counter, i battled for ages trying to get my Megajolt to work, using every conceivable output available to me to no avail.

 

I've got some pics and such and can talk you thru what needs to be done if you need it fella.