hacking dbw throttle body
Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
hacking dbw throttle body i was thinking it could be possible to intercept and modify the tp input signals to get the tac/throttle modules to look up another aea of the pedal response map. the goal would be to limit the tb opening in 1. gear.
has anybody messed with this? or is there a contoller out there that can do this?
has anybody messed with this? or is there a contoller out there that can do this?
Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
the gadgets i have seen so far aim to increase throttle response. they all seem to be "preprogramed" and dont let you really manage the tb. would banks contraption do what i want?
how linear are the pedal sensors? maybe it woud be as simple as using a series or parallel resistor.
how linear are the pedal sensors? maybe it woud be as simple as using a series or parallel resistor.
TECH Addict
Joined: Dec 2004
Posts: 2,177
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From: Florida
the sensors are basically linear output. theres two and they are inverted from each other, so tps 0-100% is 0-5v with one output and 5-0v on the other. a series resistor wouldnt do anything but a parallel resistor will shift the signal up, which would throw dtcs since you need one to go up and one to go down. look into a voltage divider to do what youre thinking. i dont think any of this will really be a good idea though. if i just HAD to do this, id use a teensy or esp or whatever microcontroller (i do custom pcbs using avr tiny or Dx series these days) to read the pedal signals, modify them in firmware, and use dual mcp4725s to output new signals to the ecu. basically exactly what a pedal commander does but home-made. the hardest part would be tuning it
no idea whether or not the banks pedal thing is programmable or not. he has a video about it that i thought was mildly interesting.
no idea whether or not the banks pedal thing is programmable or not. he has a video about it that i thought was mildly interesting.
Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
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From: switzerland
i think i will get the sensor and play with it. im seeing 50 kpa of boost at 45% throttle at 6k and thats about what i could use in 1. gear. maybe it can be done with resistors after all.
another idea would be to modify the pressure signal. does that go into the tac-module? then i would need to set up the 3-d tp/vacuum map falling with vacuum. no idea what that would do for normal driving, as it seems to have constant values across that axis in all tunes i have seen so far..
another idea would be to modify the pressure signal. does that go into the tac-module? then i would need to set up the 3-d tp/vacuum map falling with vacuum. no idea what that would do for normal driving, as it seems to have constant values across that axis in all tunes i have seen so far..
Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
dual inverted doesnt scare me, but i would prefer to work on the tac inputs. a new idea is to modify the rpm signal to the tac and use the tp%/rpm table (now set to 100%) to limit the tb opening. e.g. dividing the signal by 4. however i know nothing about the tac. any idea where i could get a pinout?
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I don't know about you, but my engine will still see full boostat 1/3, 1/2, 3/4 throttle depending on how my boost is set in my controller. If you aren't using a controller and running off the gate or a manual controller, I see no point in this. You need a controller that does boost by gear. i have one and i wouldn't be without it now.
TECH Fanatic
Joined: Jan 2018
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There is a "max torque by gear" in the P01 and P59 PCMs, and I think it does what you want, but I have to admit that I haven't tried.
It's a table with gears on one axis, RPM on the other axis, and the cells are the max torque for that gear at that RPM. If I understand correctly, it converts the max torque to a max throttle opening.
It's a table with gears on one axis, RPM on the other axis, and the cells are the max torque for that gear at that RPM. If I understand correctly, it converts the max torque to a max throttle opening.
I have one of the Banks Pedal Monsters on my 21 Tahoe.
It's not going to do what you want it to do.
I'd go with a Dominator or Terminator X Max and create some custom tables.
It's not going to do what you want it to do.
I'd go with a Dominator or Terminator X Max and create some custom tables.
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Thread Starter
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
centri here.
i have experimented with the tq by gear table a bit. the problem is, that for some reason i havent been able to figure out for years, my system (efilive) doesnt reproduce the tq correctly. it stubbornly shows a max between 3-4k while its realistically around 6k (ibpw and dyncylair rising up to redline). i once put in a very low value, 50% of max maybe (below what its showing at 6k) and the result were violent swings of throttle. the algorythm is reactive, i need a proactive setup.
i was even thinking of adding another throttle body and try to manage that. (juniors 325i bmw had 2 throttle bodys, never found out what the second was for.) another possibility is an on/of restrictor before the blower. no idea to what estend it would help, because it would be restricting hp and not tq and would be hard to implement for sure.
and before somebody sais the pedeal is not an on/off device: its absolutely impossible to make an e.g. 150kpa pass on this setup (about 230kpa max boost, =20 psi).
i have experimented with the tq by gear table a bit. the problem is, that for some reason i havent been able to figure out for years, my system (efilive) doesnt reproduce the tq correctly. it stubbornly shows a max between 3-4k while its realistically around 6k (ibpw and dyncylair rising up to redline). i once put in a very low value, 50% of max maybe (below what its showing at 6k) and the result were violent swings of throttle. the algorythm is reactive, i need a proactive setup.
i was even thinking of adding another throttle body and try to manage that. (juniors 325i bmw had 2 throttle bodys, never found out what the second was for.) another possibility is an on/of restrictor before the blower. no idea to what estend it would help, because it would be restricting hp and not tq and would be hard to implement for sure.
and before somebody sais the pedeal is not an on/off device: its absolutely impossible to make an e.g. 150kpa pass on this setup (about 230kpa max boost, =20 psi).
