Board logo

VDO Tachometer setup.
Staple balls - 18/11/09 at 03:07 PM

Right, this one has me stumped.

I has a vdo vision tach, a premier loom, and an omex 500 ecu.

ECU is setup to output revs on the aux wire, which is hooked up to the signal in of the tach.

All good so far, but the tach appears to move with the throttle, which would be fine, but it does it when the engine's not running, which isn't so good.

So, I'm figuring the ECU is evil, or I need to fettle the tach, and I don't understand the manual. (especially the bit attached)

Any ideas?

Cheers Rescued attachment tachconfig.gif
Rescued attachment tachconfig.gif

TimEllershaw - 18/11/09 at 04:14 PM

quote:


but the tach appears to move with the throttle, which would be fine, but it does it when the engine's not running, which isn't so good.


I think they are supposed to do that - sort of a test state. My Omex 100 does the same when the engine is not running. Pressing the accelerator will make the tacho jump about. I assume that it does something when the engine is running ?



From the Omex manual :
quote:

if set the then the auxiliary output will produce a tacho pulse for every timing event. Note that the Tacho will show 3,800 rpm if the engine is stopped and the throttle is at TPS min if Tacho is set. This is a TPS setting aid.


I assume that the "tacho pulse for every timing event" means you will get a pulse for each spark plug, so (I guess) set the gauge to the top option for 4 cylinders.

Tim

[Edited on 18/11/2009 by TimEllershaw]

[Edited on 18/11/2009 by TimEllershaw]

Staple balls - 18/11/09 at 04:37 PM

Cheers, that sounds sensible, so I'll have a play.

Not been able to check properly with engine running as it's a bit hormonal at the moment.