TE 511 run without stepper motor on the shaft .

[9880sts]

My stepper motor failed. So i pulled it off and set the secondary TPS to 1.1V.

I don't get a fail message any more since i removed the inside of the stepper motor.

Who has done the same or had the stepper motor failing ..

 

[Dangermouse449]

Interesting development Helmut.

I've always assumed that the secondary TPS doesn't register as a fault if between the 'normal' voltage ranges, I guess this confirms it.
I thought this through when I had my 'dead throttle' experiences & did not have a fail message appear.

(In an automotive system, this would certainly leave a fault code.
If a device like a fly-by-wire throttle is used, it usually has two systems of monitoring the shaft movements.
The ECU uses these signals to confirm that the butterfly turned to the requested position).

In the case of the TE449/511 secondary butterfly, this clearly is not the case as numerous bikes have experienced the 'dead throttle' where the electric
butterfly does not open when the primary throttle is moved. Certainly on my own bike, this left no fail message in the ECU.

It would seem likely then, if what you're saying works, that you could fit the TC throttle body, use the old stepper motor housing (secured somewhere out of the way) & secondary tps setting you mention, & be able to utilise the TC fast idle/hot start knob the throttle body is fitted with.

Cool

 

[9880sts]

Interesting development Helmut.

I've always assumed that the secondary TPS doesn't register as a fault if between the 'normal' voltage ranges, I guess this confirms it.
I thought this through when I had my 'dead throttle' experiences & did not have a fail message appear.

(In an automotive system, this would certainly leave a fault code.
If a device like a fly-by-wire throttle is used, it usually has two systems of monitoring the shaft movements.
The ECU uses these signals to confirm that the butterfly turned to the requested position).

In the case of the TE449/511 secondary butterfly, this clearly is not the case as numerous bikes have experienced the 'dead throttle' where the electric
butterfly does not open when the primary throttle is moved. Certainly on my own bike, this left no fail message in the ECU.

It would seem likely then, if what you're saying works, that you could fit the TC throttle body, use the old stepper motor housing (secured somewhere out of the way) & secondary tps setting you mention, & be able to utilise the TC fast idle/hot start knob the throttle body is fitted with.

Cool

sounds about right... i will test ride on tuesday.

We do have Melbourne Cup... in my word " horse cruelty on high level" Money talks and rules.

Once we take Dairy cows for racing people will scream and ask whats the go with cows on Race tracks... Well Cows run away from danger so why not use cows.

When i was out last time , the stepper motor was constantly going.. Now i pulled the inner Magnet out of it. But left every thing connected. In BMW TPS procedure , they set the Secondary TPS to 1.1 V i think. I tried to set it at 1,5 V and 2V. But both settings came up with FAIL. SO i set it back to its start point and no FAIL.

A ride on Tuesday will tell.

 

[Dangermouse449]

See what happens I guess.

 

[9880sts]

good one that i bought the TPS piggy wire....
Primary set to .8V and the secondary is solid at 0.6V.
I reckon it works the following way.
Main TPS tells ECU how far you open the flap and allow the right fuel amount.
Secondary is there to take the snappy response away. The second Butterfly will then open parallel to the MAin butterfly but with a time delay ....
I have send a message to the Bavarian friends with the Question of removing the stepper motor ?!
Will see what i get back. But so far i was playing around today and it was going well...

 

[Motosportz]

I had many dead throttle experiences before the BF removal and zero fail indicators.

 

[Tinken]

It would seem likely then, if what you're saying works, that you could fit the TC throttle body, use the old stepper motor housing (secured somewhere out of the way) & secondary tps setting you mention, & be able to utilise the TC fast idle/hot start knob the throttle body is fitted with.

I run the TC throttle body and a TC ecu, I just cap off the unneeded plugs. Ty's old team made stepper motor resistive loads on a small piggy cable to eliminate the fail code, then removed the whole motor and housing.

If you ask me, the hot start button is essential. Sure you can crack the throttle open, but it's not fool proof like the button. Not everyone is going to want to spend $400 or so dollars on a TC tbi just to get the button, so I had hot start buttons made for the TE 449/511s.

 

[Dangermouse449]

As I've mentioned elsewhere, it's a crying shame that Keihin/Husky didn't use the full capability of the efi system to deal with -
1/ hot starts
2/ altitude correction
3/ airflow changes
simply by using the fitted sensors already there
We basically got an electronic carby!
(We haven't had carbs on new cars here in Aus since about 1992)

I'm quite interested to see how the Synerject system on the new Shercos goes.
It uses its map sensor as the load metric. Should be a good thing.

 

[9880sts]

So the bike run flawless.... TPS installed and just sitting in there .
Stepper motor stripped and without inner magnet .

So no more open close noise to hear from the motor ..
In regards to the riding i did .. 26km in 4hrs.
Bike starts easy and no flame outs... sould not have been better today.

 

[Dangermouse449]

That's awesome mate.
Good to hear

 

[Dangermouse449]

I had many dead throttle experiences before the BF removal and zero fail indicators.

Yeah, exactly.
Seems the system isn't set to register a fail unless it goes outside the upper & lower limits, not 'away from requested' movement of the second butterfly shaft.(Like dead throttle)