DBW - how to determine TB opening vs pedal position?

DSG2003Mach1

Well-Known Member
Established Member
Premium Member
Single Barrel Sirs
Joined
Apr 15, 2004
Messages
12,155
Location
Central Fl
I've been wondering if part of the reason my ecoboost f150 feels so snappy is because the tune plays with the throttle body but looking around in LiveLink Im not quite sure how to determine it. I realize it also could be more boost and/or timing down low that makes it wanna spin a tire when you think about the throttle in the rain.

Normally I would assume on a stock vehicle the pedal position and TB opening would be linear - 1/4 pedal = tb 1/4 open etc... if the tune was making it where the TB is 1/2 open at 1/4 throttle pedal position which pids would you compare to see that?

I mean, isn't that how the pedal commanders and stuff work?
 

BlackStang00

Member
Established Member
Joined
Sep 6, 2011
Messages
78
Location
Naples,Fl
What app are you using to datalog? I know on Forscan there are pids for APP-Accellerator Pedal Position and TP-Throttle Position. It’s been a while since I’ve used both pids but they should be able to be viewed in degrees. Also I think there’s another pod for Throttle Angle too.

Someone on another forum explained how the pedal commander worked. I said it worked like you described but they gave me some sort of convoluted answer. I’d assume it works like you describe though.


Sent from my iPhone using Tapatalk
 

DSG2003Mach1

Well-Known Member
Established Member
Premium Member
Single Barrel Sirs
Joined
Apr 15, 2004
Messages
12,155
Location
Central Fl
I have line link 2 and forscan

When looking at livelink there were quite a few pids to pick from
 

decipha

Well-Known Member
Established Member
Joined
Jul 12, 2008
Messages
872
Location
New Orleans, LA
Yeah its very common for tuners to command more throttle at a lower pedal position to give you the end user a more sportier pedal feel.

The relationship between pedal and actual throttle is not exactly linear though. The pedal position is just a feed forward driver demand or torque commanded, the ecu calculates what all needs happen to deliver that amount of torque weather it be boost, spark, fuel or cam timing, imrc, etc... all of which are modifiers to torque.
 

DSG2003Mach1

Well-Known Member
Established Member
Premium Member
Single Barrel Sirs
Joined
Apr 15, 2004
Messages
12,155
Location
Central Fl
Yeah its very common for tuners to command more throttle at a lower pedal position to give you the end user a more sportier pedal feel.

The relationship between pedal and actual throttle is not exactly linear though. The pedal position is just a feed forward driver demand or torque commanded, the ecu calculates what all needs happen to deliver that amount of torque weather it be boost, spark, fuel or cam timing, imrc, etc... all of which are modifiers to torque.

in other words not that simple.

I don't really wanna pay the couple bucks for a tune revision but I might. I can appreciate the instant power but at the same time my truck has an electronic locker so it's essentially an open diff. It's incredibly difficult to the put the power down like that from a stop/low roll. Making a right turn and merging into traffic when it's wet can get interesting quickly
 

decipha

Well-Known Member
Established Member
Joined
Jul 12, 2008
Messages
872
Location
New Orleans, LA
Yeah I hear ya I have a 20 f150 I daily and the electric locker stays engaged when you turn it off making turns hop a bit
 

SecondhandSnake

Well-Known Member
Established Member
Joined
Jan 29, 2011
Messages
1,501
Location
Columbus, IN
in other words not that simple.

I don't really wanna pay the couple bucks for a tune revision but I might. I can appreciate the instant power but at the same time my truck has an electronic locker so it's essentially an open diff. It's incredibly difficult to the put the power down like that from a stop/low roll. Making a right turn and merging into traffic when it's wet can get interesting quickly
FWIW as an alternative to the tune they sell boxes you can snap inline with your throttle pedal connector that do the same thing. Not sure if they're cheaper than a tune revision in your case though.
 

DSG2003Mach1

Well-Known Member
Established Member
Premium Member
Single Barrel Sirs
Joined
Apr 15, 2004
Messages
12,155
Location
Central Fl
FWIW as an alternative to the tune they sell boxes you can snap inline with your throttle pedal connector that do the same thing. Not sure if they're cheaper than a tune revision in your case though.
Tune revision is under $50 if I remember right so not a big deal
 

Users who are viewing this thread



Top