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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-17-2018, 04:38 AM   #1
cwarel
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Thoughts on m50 throttle body with MS43

So im running m50 manifold and I was wondering if I could make this throttle body work with MS43 . I think ms43 throttle body has 2 tps sensors built in it , but im not sure , lets put away the fact that I would have to run cable change pedal to mechanical one to the side for now. Concentrate on the ms43 and m50 throttle body. So m50 has 1 tps sensor on it , If the potentiometers are the same in m50 tps and m54 tps so it would only take 3 wires to wire a tps and basically you could have this working with ms43 but what gonna happen if ecu doesnt see throttle body connected would it throw EML or not , would the car even drive ? Since throttle map is base off TPS monitoring we would only need to make sure that m50 sends a valid TPS signal to ms43. Or take apart m54 throttle body and weld up or screw or add someway the cable to it .Just thoughts

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Old 01-17-2018, 06:20 AM   #2
daniel_f.
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Much easier to purchase or build an adapter to fix the different bolt pattern ;-) MS43 goes into limp mode when tps/mtc wonīt match.
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Old 01-17-2018, 09:15 AM   #3
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it's basically impossible to disable the DBW system - because it's a safety system and has to 'failsafe', there are many security and backup mechanisms. You can't just plug in a cable throttle, delete an error code, and make it work. As Daniel says, it will go into limp mode and you can't really turn it off.
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Old 01-17-2018, 09:38 AM   #4
sda2
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Could it be possible to set up a second variable (stereo) resistor on the throttlebody to emulate the two TPS inputs on the MS43? One from 0 to 5V and one from 5V to 0V.
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Old 01-17-2018, 02:07 PM   #5
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sure, but why? All that just to retrofit a cable throttle? also if the curves are even a little out of tolerance of what the DME is expecting, it will go into limp mode, and this routine is not very forgiving.
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Old 01-17-2018, 04:21 PM   #6
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I can tweak it to just one sensor, no Problem. It just doesn't make sense if we can use an adapter
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Old 01-17-2018, 05:33 PM   #7
cwarel
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The reason is because if we got cable throttle body when u floor it it has no delay so its always a true input , rather than a drive by wire that opens throttle body slower and progressive without snappiness , where cable just pops it open in an instant
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Old 01-17-2018, 05:35 PM   #8
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Originally Posted by cwarel View Post
The reason is because if we got cable throttle body when u floor it it has no delay so its always a true input , rather than a drive by wire that opens throttle body slower and progressive without snappiness , where cable just pops it open in an instant
Isn't that related to anti jerk?
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Old 01-17-2018, 05:47 PM   #9
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It's not something I'd want to screw with, personally. There have been deaths and lawsuits because of badly engineered e-throttle systems (see: Toyota). Sure, you could just rip out the code that does all the checks and reads from both sensors, but you'd be taking on risk if something happens. And as you said - you can also just get an adapter.
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Old 01-17-2018, 05:47 PM   #10
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Quote:
Originally Posted by cwarel View Post
The reason is because if we got cable throttle body when u floor it it has no delay so its always a true input , rather than a drive by wire that opens throttle body slower and progressive without snappiness , where cable just pops it open in an instant
that is just flat out untrue - and it depends entirely on throttle mapping.
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Old 01-18-2018, 02:09 AM   #11
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For me there is no reason doing it, I use DBW with the ICV delete and a linear throttle map. No issues and the lag completely disappeared. Anti jerk also disabled
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Old 01-18-2018, 04:16 PM   #12
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For me there is no reason doing it, I use DBW with the ICV delete and a linear throttle map. No issues and the lag completely disappeared. Anti jerk also disabled
What is anti jerk? I don't have a clear understanding of what it does
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Old 01-18-2018, 05:18 PM   #13
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it stops your car from 'bucking' which can happen at low loads and throttle angles. Like if you were just learning to drive manual.
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Old 01-18-2018, 08:31 PM   #14
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it stops your car from 'bucking' which can happen at low loads and throttle angles. Like if you were just learning to drive manual.
So would that mean flooring it would allow "more" power delivery rather than it being smooth? Or does it not have anything to do with the engine
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Old 01-18-2018, 11:06 PM   #15
hassmaschine
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It has nothing at all to do with flooring it or power. Its a low load/rpm thing.
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Old 01-20-2018, 07:49 AM   #16
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Deleting the electronic throttle was the best mod I ever performed on my car. Driveability and throttle response is much better with the cable throttle. I did it by deleting the stock DME and going with a Megasquirt but it has been done with a reprogrammed DME. Randy Mueller knows how to do it.
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