Tacho help.

[VR42LT]

Hi guys as most will know i did a rvr engine swap into my nimbus.

Im running a motec M4 ecu but with stock coil pack and ignighter. Now i can locate the tacho wire from the dash and the tacho wire from the ignighter, how do i get my tacho to work?

Now before you say just join the 2 well ive done that but it still wont work.

Ive heard of inline resistors wlto get these to work with the 2 cables but im not sure what happens when the 2 cable met at the stock ecu.

Any help would be great fellas.

 

[khubner1]

hmm in gsr/evo the wire from the ignitor goes to both ecu and tach directly it splits somewhere in the loom. when i went to ls1 coils i simply cut out the ignitor used two of the original triggers wire 2 new ones used existing power and earth and left the (unused wires un-terminated but Sheided)
changed a setting in the ecu so the ecu sent out a tach signal and was done. perhaps instead of using signa; from the ignitor send the signal from the ecu. (the ecu should use the cam and crank sensors to determine rpm)

NOTE: this was a haltech ps1000

 

[bazeng]

What is the nimbus tacho vs rvr tacho difference?

While doing my auto conversion I found that I couldn't use a galant se tacho which had a 6500rpm redline with the AMG ignitor. Unsure why....

What ecu are you Running?

 

[evo-gsr]

"Im running a motec M4 ecu but with stock coil pack and ignighter"

 

[bazeng]

Thanks Jamie...

If you have a spare output, you can use the motec m4 to output an tacho signal to your tacho. For test purposes. This way you can define a few settings to troubleshoot. If the output is free, make it permanent.

But I know m4s are very limited in output volume. Ideally you do want the ignition module to output tacho to enable you to save that m4 output for another use.

 

[evo-gsr]

No probs Barry.

 

[JayRome]

what was the original ignition system for the Nimbus? Dizzy or coil packs?

 

[VR42LT]

Cheers fellas but as luck would have it the old nimbus dropped a valve on the way to work 2 days ago so thats that for now, piston kissing the valve at 110km/h on the freeway for about 30sec

But it was dizzy jay