New stepper motor

[WokingWedger]

After being persuaded that the system as design can work satisfactorily after all, and I don't need to add a switch to the stepper motor to stop it interfering, I bought a new (OEM) stepper motor from Racetech (very prompt delivery).

Now I notice a couple of things after fitting it.

I can’t hear it resetting itself as I could with the old one. Is there a simple test to check the stepper motor is working?

It has certainly stopped the hanging on of revs as I come to a stop and makes changing gear better as the revs drop when you want them to.

However, if I take my foot of the throttle and push the clutch in (coasting) the revs drop right down to less than 500 rpm and then recover to 950 rpm ish. It hasn’t actually cut out on me but it is a bit disconcerting.

I have tweaked the base idle up a bit (everything off and just undid the grub screw an extra quarter turn). I suppose I really need to do this correctly (engine running and by pass hose clamped) as soon as I get time.

It also needs to be a bit faster on tick over when cold (I guess do the base idle properly is the answer)

I have bought the Rovergauge cable, but haven’t had chance to play yet.

What should I look for on the Rovergauge display ?

[Barreti]

Blitzracing has documented how to test the stepper, and there is probably other information on his pages you will be interested in.

Clicky

[ianwayne]

WokingWedger said:

After being persuaded that the system as design can work satisfactorily after all, and

However, if I take my foot of the throttle and push the clutch in (coasting) the revs drop right down to less than 500 rpm and then recover to 950 rpm ish. It hasn’t actually cut out on me but it is a bit disconcerting.

I have tweaked the base idle up a bit (everything off and just undid the grub screw an extra quarter turn). I suppose I really need to do this correctly (engine running and by pass hose clamped) as soon as I get time.

Mine does this, as does my friend's 500. I fitted a new stepper a few months ago (genuine one from Racetech) and put it down to 'TADT', especially when still warming up.

[EGB]

Barreti said:

Blitzracing has documented how to test the stepper, and there is probably other information on his pages you will be interested in.

Clicky

Also how to dismantle, clean and lubricate it proper. Do this first before buying a new one.

[WokingWedger]

I have already bought a new one.

The old one I could distinctly hear resetting itself, but this one is silent ( or not working)

Can everybody hear their stepper ?

[WokingWedger]

Barreti said:

Blitzracing has documented how to test the stepper, and there is probably other information on his pages you will be interested in.

Clicky

Thanks Ian, lots of useful info there

[EGB]

WokingWedger said:

Thanks Ian, lots of useful info there

Service and clean the old one. You may still find it useful.

[EGB]

WokingWedger said:

Thanks Ian, lots of useful info there

Service and clean the old one. You may still find it useful.

[Goaty Bill 2]

WokingWedger said:

Can everybody hear their stepper ?

If I have ever heard my stepper motor, I am sure I had no idea what it was

[blitzracing]

Dont forget you have full stepper control with RoverGauge- you can simply unscrew it, turn on the ignition and then use RoverGauge to send steps to the motor and watch it move- 30 steps is a good number. Be warned though that if you extend the cone beond the end of its travel it will come out of the motor, and its spring loaded so it pings away and you may loose the bits, so put it in a box if in doubt. The total travel is something like 120 steps.