M3 DBW throttle motor photos sought

[Basil]

Looking for detailed photos of the DBW M3 throttle actuator motor and set up, as I am thinking of using it on another multiple throttle body straight six engine. Thanks

[The Gorilla]

Hi,

Its just a Stepper Motor that is
bolted to the side of the engine
block.

It has a rod with plastic rod
ends, that attach the stepper
motor to a link on the main
bar that passes through the TB's.

All the workings are really in
the software which reads
via the TPS and the Throttle
pedal Peton [6 or so wires].

Regards,

The Gorilla.

[Basil]

Thanks, would still like to see photos. What does it use for the feedback position sensor, a separate pot to the throttle pot, or combined? I intend running it off my M800 Motec ecu, which has DBW enabled. It's initially to go on an RB26 Nissan engine, then one is going on a Bonner V6 race engine, which has a slide throttle. Cheers.

[The Gorilla]

Hi,

I believe that Motec now have a Map
that will drive the Stepper Motor and
compensates via engine temps so you can
program / set the ITB's for Idle
at cold and they calibrate via
the opening/position of the
stepper motor when warm, as
opposed using the Idle Air
Intake Valve etc.

Otherwise I am guessing your going
to have to fit some sort of Idle valve
set up for the ITB's.

I have no pics of the Stepper Motor
in-situ, and the Air Box needs to be
removed for a good picture.

Is there nothing in the Pic Gallery ?

I run a Manual Throttle on another
S54 engine [6 pot] and find it much more
linear than the E.Gas / DBW.

I would guess that your looking
for the ability to be able to alter
Throttle angle V Pedal angle input ?

Personally I prefer the crispness
of the Cable, but each to his own.

Regards,

The Gorilla.

[Basil]

Warm up compensation and idle speed control won't be an issue on the RB26 as it has an idle control valve as well as the throttle bodies, and the other is a pure race engine, so no idle control is really needed there. So does the positon feedback to the ecu come from a single throttle position sensor, or has it a dedicated one for the DBW, as well as one for the main fuelling / ignition mapping in the ecu?

It's mainly to allow implementation of traction control via throttle opening.

[The Gorilla]

Hi,

The S54/CSL just runs the single TPS
and a Pressure sensor with Air Temp
for its Bastardised Alpha N.

The standard S54 / M3 runs a single TPS
but usees a MAF on the Intake
as it does not run a Alpha N type map.

The Siemans MS S54 ECU defaults to
Alpha N for Limp Mode.

Will see if I can dig out a pic for you.

Regards,

The Gorilla.

[The Gorilla]

Hi,

Basil- couple of pics of the Stepper Motors
and linkages from BMW S65 M3 Engine [V8]

The principal for the S54 [L6] is exactly
the same, many of the connectors and
linkages etc are common to both engines.

The Stepper Motor fits on the side of
the engine as opposed in the V8 on the
S54.

Hope that helps.

Regards,

The Gorilla.

[Basil]

Sorry for the delay, for some reason I didn't get, or maybe see, a reminder by e-mail of you latest reply. That's exactly what I am looking for, sincere thanks for your trouble. It looks as if that drive motor might just do the job, certainly with it having a link arm if adds a good degree of installation flexibility. On the M3 unit where are the pots for the DBW feedback, in a combined casing on just one end of the throttle shaft?

Again, thank you very much indeed :)

[The Gorilla]

Hi,

Yes, the S54 has the TPS at the end of
the bar that links all the TB's Butterflys.

See pics.

I used the S54 TB's on this project
but have gone with a Manual throttle,
as the ''DBW'' is always an option at
a latter date.

Regards,

The Gorilla.