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R56 Throttle only 85.5% at WOT

Old Jul 25, 2016 | 10:39 AM
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Throttle only 85.5% at WOT

Ive been recently messing around with a Bluetooth adapter scanner to use the Torque App for all OBDII vehicles. Driving around with the '12 MCS, the throttle percentage only goes to 85.5 max. (100% on two other vehicles for reference). Any known reason for this, is it adjustable? I have a fair amount of experience in ALDL tuning but drive by wire is new to me. Any info would be great. Thanks!
 
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Old Jul 25, 2016 | 11:00 AM
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Is your car an auto or manual? The only thing I can think of is auto-specific - maybe something to do with the kickdown feature? I don't know if they do this for MINI but I had a couple bmw's that have a little detente near the bottom of the accelerator pedal travel and you have to push past that for the car to downshift and accelerate as fast as possible.
 
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Old Jul 25, 2016 | 11:06 AM
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Originally Posted by 3lusive
Is your car an auto or manual? The only thing I can think of is auto-specific - maybe something to do with the kickdown feature? I don't know if they do this for MINI but I had a couple bmw's that have a little detente near the bottom of the accelerator pedal travel and you have to push past that for the car to downshift and accelerate as fast as possible.
6 speed manual. I did look under the pedal to check for any obstructions too, nothing.
 
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Old Jul 25, 2016 | 12:05 PM
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OK well I have a 6sp, Torque app and bluetooth adapter so I will run WOT on my way home and let you know what I find! As if I need another reason to go WOT...
 
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Old Jul 25, 2016 | 07:25 PM
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so I went briefly WOT and saw that the throttle gauge did max out around 85.5% exactly. Also I noticed that at idle the throttle was around 16%. I'm doing some research and it sounds pretty normal to not reach 100% and also not idle at 0%. I guess it's different for different cars but people have reported only seeing 85% throttle at WOT for cars like the CTS V and some Audis.

Throttle only 85.5% at WOT-4uni1bm.png
 

Last edited by 3lusive; Jul 25, 2016 at 07:58 PM.
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Old Jul 26, 2016 | 04:23 AM
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Interesting!! Time to dig further.
 
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Old Jul 26, 2016 | 06:28 AM
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It depends on the PID being reported. SAE Absolute Throttle Position will report 85%. This is due to the 0 - 5 volt scale the throttle potentiometer puts out as it never reaches 5 volts. Not an issue since it was never designed to by BMW. The PID you want to reference is Commanded Throttle Actuator Position SAE.TAC_PCT. This reflects the commanded butterfly position (N14) / Valvetronic actuator position (N18) and will report 100% at WOT.
 
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Old Jul 26, 2016 | 06:35 AM
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Solid info... thanks Tig.
 
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Old Jul 26, 2016 | 07:07 AM
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https://torque-bhp.com/wiki/Throttle_Position

Now I have a page set up on the app with all the other readings. Unfortunately I have a lot of sh*t to get done today so maybe I'll get to it tonight.


 
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