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Tommy Luhr

E-throttle and isc sol on a v12 engine, setup help

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Hi! I'm building a Lambo replica and i have tuned a M120 Mercedes v12 engine with itb's on it. Engine is stock by now.

Running Bmw m3 Accutators/servomotors for the E-throttle, got two of this.  I got a own engine dyno and roller, trying to tune idle with this setup but it is hard to get stable without take some help from idle ignition. 

When i boost ignition at idle the engine missfires and there are some trouble to get clean exhaust gases.

Need to get perfect exhaust numbers to get pass the car inspection.

But my last idea is to only use E-throttle as servo assist for pedal and don't use them as idle control. Instead i mount isc solenoids and running them for idle control.

Running a Thunder on this and got room for adding isc solenoids.

When i setup this funtion in the software, "open/closed loop sol idle control" ask me if i got a 4 or 6 wire stepper. I thougth i could use 2 pin solenoids?

I think i will need one stepper for each bank of the engine, total of 2 solenoids.

Can i run two 4 pin stepper as paralell to one output? can the drives handle that?

I have never used 4 pins steppers before, maybe i cant't use them on the same setup.

 

What should you do in my situation?

 

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I would avoid a stepper motor, but two solenoids connected to the same output should be fine - just check they dont pull more than 2A total.  

The common 2 wire Bosch ones from BMW etc would probably be plenty big enough.

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Hi,

Came across this by accident.

Guess your using 2 Banks of BMW S54 M3 ITB;s ?

On the std M3 set up the Stepper motor only works from approx 1800 rpm.

The MS S54 DME uses a cold air inlet valve for Idle and low rpm.

So the ITB's are shut until around 1500 rpm. [Emissions and idle speed]

As this CAV closes under load so the Stepper Motor takes over for the ITB's from  approx 17/1800 rpm onwards.

In Std Mode its almost linear from Throttle Pedal to TPS on the ITB's and then in Sport Mode its

around 75% TPS to approx 50% of Pedal.  [ I may still have the TP / TPS graph] 

Std M3 Throttle Pedal only opens the ITB's to something like 96%.

I am looking to do something similar with the M120/ITB's hence how I came

across your thread.

 

Regards,

Steve.

 

 

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