There is a thread over at mustang forums that may be of interest.
Mustang Forum Topic

Has anyone seen this behavior. I know I have with regards to the last 25% of the pedal travel feeling exactly the same. A video on there proves that it opens 100% when the vehicle is off but when its on I dont believe it does. Thoughts?

 

Sounds interesting. I'm going to try it as soon as I get home. I'll let you know. Thanks for the info.

 

I just shot an email to DTP about it, maybe they can do something about the throttle blade issue and get some more power out of the engine.

-Dan

 

Hey Dan, I've been meaning to ask you. How's DTP been for you?

 

Another quick way to see if your car is only opening part way is to floor it in say 5th going about 75 and start backing your foot off. You can back it off about 2.5 inches before the car even registers that you let off. Thats because its stuck at 82% throttle position for that length of pedal travel. Is there anyone I could inquire to regarding this. Someone at Ford or what? I really want to pursue this issue. Id hate for ford to be hiding that power for the release of a SE edition stang.

 

This may be something feasble to look at if it were a pedal-follower Throttle system like on the GM's but on a Ford it isn't. The pedal is only an input device not a controller. Kinda like a TPS but not the actual throttle motor.

The Ford Throttle system is torque based, in other words it takes a certain pedal position and compares that with about 10 charts and tables and figures out how much torque, in metric denomanations, that the engine should be making in that situation. THere are plenty of times that the pedal may not even be at WOP (Wide Open Pedal) but the throttle plate may be at WOT in attempt to make the desired engine torque.

It is done this way for alot of different reasons like VCT, Performance, IMRC controll, and even automatic shifting to make up for torque loss. Then there are features to it like Throttle Limiting and Torque management that keep the car from clunking into gear and other Noise/Vibration/Harshness concerns from Ford.

On a Factory program when the vehicle is within so many RPM's of the throttle based Rev limiter it will begin to close the throttle no matter what pedal position it is at. The same goes for shifting on both an automatic and manual.

This is where tuning from Well-Known tuners with experience on these vehicles comes into play. You can't just go in and turn Torque Management off or else you can get a clunk while low speed driving and in traffic situations.

Also you can't adjust throttle parameters by playing with the numbers, SCT doesn't allow their dealers to have controll over the Throttle settings until they have completed Advanced Training Classes from SCT because of the Danger's of messing with these settings.

I'll stop there but to put it plainly one of the first things you should purchase if you do decide to make some mods on your GT is a tuner, preferably from BamaChips.com but if not any well known SCT dealer. I can't speak for Diablo nor will I but I do know we have great programs and have most of the above issues perfected.

Thanks, Doug.

 

Brent @ DTP has been great, really on top of things with me anyways. He suggested a few things to me with my tunes and I appreciate the time he takes with all my emails. Its a bit of trouble to drive out more than 60 miles to get to my local dyno tuner and I'd rather drive out there with no CELs or Fail Safe Modes. I have a little cash to play with so once I get my Headers in I'l take a trip back to the dyno so I can get my nitrous tune done.

-Dan

 

thanks for your expertise doug. Just another reason why Im going with bamachips in the next couple of months..

 

Thanks Doug. I though as much but actually knowing is another matter. Your information cleared up the issue for sure.

 

Thanks for the input/insight Doug