Drive By Wire Throttle Body In An 850R?

[Über855R]

First, the reason I am thinking of doing this is because I have a set of electronically controlled hand controls (guidosimplex) in my car (see my thumbnail). Having a direct link to the throttle body via electronic interface would make a smoother and more responsive throttle control for my purposes.

That said: What would be involved to switch over to an electronic throttle body? Assuming I could mate up to the manifold or have a custom manifold made to fit whatever throttle body I use, what would be required on the tuning side to talk to my M4.4 ecu for throttle position? Is there anything else necessary to consider other than throttle position?

Also, how would that work as far as running signal from a pedal inside the cockpit for when my mechanic drives it? Do I need to change my gas pedal or could I rig a signal from that pedal?

Ideally I want a TB that works using a potentiometer for the signal, so recommendations for a suitable throttle body would be helpful also.

It's been a while since I have been on the forum. So hello to all the people I haven't talked to in a while, also to the new members. Thank you in advance for all helpful advice and recommendations.

[Tightmopedman9]

It'll be difficult that's for sure, it would probably be easier for you to switch to ME7 and have custom electronics to emulate the accelerator pedal signal using your existing hand controls. The other option would be to convert to standalone, the only one of I know that supports ETMs is made by Haltech and isn't cheap.

[venderbroeck]

I think driving the later "dumb" type ecm from Bosch wouldn't be that difficult with a microcontroller.

It was used on the stock me7 manifolds instead of the crappy Magneti-Marelli units I believe.

If I'm not mistaken it's all pwm based, which is't hard to program.

Emulating a tps signal wouldn't be that hard either.

You would probably use a pot to signal the micro what kind of angle you'd want.

If you choose the right pot (or use an actual tps) you could feed the ECU the same signal.

The hard part is safety.

Safety features have to be implemented to ensure nothing weird happens, turning your car into a killmachine.

It's certainly possible to implement such features, but you'd first have to find out how.

There's probably some documentation floating around about that, so that would be the place to start imo.

[fyrken]

This can be done in two ways:

* Modern aftermarket ECU with DBW option and A/T control (regarding your thumbnail I assume that you have an auto gearbox - I used to run my car with hand control and it is A/T). This option is rather complex but offer great tuning possibilites. The system that I can think of that handle A/T is Syvecs.

* DBW module/micro controller that only has your hand control and controls an electronic throttle body. There are some companies that makes external DBW controllers, they might be suitable for you.

Regarding safety with DBW; dual sensors are used for each end. Two sensors at your hand control and they should not differ from each other. The same with dual throttle positions sensors at the throttle body.

ME7 is not the way to go since it requires CAN-bus, IMMO etc. But complete package from S70 99 would work, if you can get the same signals as ME7 accelerator pedal (analogue and PWM).

A micro controller could solve this if you know your way around electronics.

For yearly inspection an aftermarket ECU will not have correct OBD. Then a micro controller for the throttle will work since the car doesnt know what has happened.

[rkam]

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