Did the Gas pedal mod.

[forum155pl]

I have a buddy with a ford wrecking yard and lots of free time, so i goof around alot, I have 3 TB's sitting in my room right now that i have messed with in differant ways.. trial and error i guess lol.. i'm doing longtubes and stinger side exhaust with a TB and plenum in the next few weeks so i'm not too worried about it.. plus i have all my stock parts (yes, unmessed with)

 

[forum155pl]

bet you guys havent seen a stang with a f150 intake on it i'll see if i can find pics...

 

[DTNODYA]

bet you guys havent seen a stang with a f150 intake on it i'll see if i can find pics...

 

[Stang|ess]

I did it so I can heel-toe a lot easier.

there's no stinger side exhaust, unless you plan on making a custom one. if you do, be sure to take pics .

 

[hotmustang331]

I think if you read my post one more time, you'll find that I never said that adding an aftermarket TB/Plenum would not increase power. I was merely trying to show that guy that in his efforts to port and make the throttle blade open more, he could have used his time and effort more effectively somewhere else.

The reason that an aftermarket TB/Plenum install makes the litte HP increase that it does has to do with the increased advantage of the pressure differential between atmosphere and the lower intake manifold. It has nothing to do with velocity and little to do with flow.

No, I understand that you never said anything about aftermarket TB/plenum...its just that alot of guys will come on here and be like "Your stock headers are good for 450RWHP", or "Your stock TB is good for 350HP" ...you know, basically saying that these parts do not need to be replaced until a certain point.
I didnt want people thinking "hey, well he says that my stock plenum/TB flows enough at nearly 3/4 throttle to support my engines needs @ 6000RPM....so an aftermarket TB and plenum are a complete waste of money" . And thats completely not true...sure it may not give you a TON of power...but it will help on any car.


But doesnt that "advantage" of the pressure defferential come from increased flow? And from what I have read the slight rise is designed to slightly increase velocity. Its like the plenum spacer things..but that extra height was designed into the casting on ALL aftermarket plenums.

 

[LaserRed01GT]

But doesnt that "advantage" of the pressure defferential come from increased flow? And from what I have read the slight rise is designed to slightly increase velocity. Its like the plenum spacer things..but that extra height was designed into the casting on ALL aftermarket plenums.

Close. The increased flow comes from the advantage of the increased pressure differential. The different shape and taller design of the aftermarket plenums allows for a better chance of laminar airflow down into the lower intake manifold. At WOT, the absolute pressure inside the lower intake manifold is very close to the atmosphere absolute pressure. The closer you can get to a perfect laminar flow through the TB/plenum, the greater amount of air that can be drawn in to the lower intake manfold.

 

[007]

This mod has absolutely nothing to do with opening the throttle body further. It just moves the gas pedal. I did it several years ago. Good mod.

Forgot that I did it until I stumbled over this retro thread!

 

[LaserRed01GT]

This mod has absolutely nothing to do with opening the throttle body further. It just moves the gas pedal. I did it several years ago. Good mod.

Forgot that I did it until I stumbled over this retro thread!

It also places undue tension on the factory throttle cable and also places undue tension of the throttle linkage and the blade shaft. With the increased rate of opening the throttle, you will also be slamming the linkage against the stop much harder than normal when you are going through the gears. In my opinion, I wouldn't consider that good. The gas pedal is where it is at for a reason.

 

[007]

It also places undue tension on the factory throttle cable and also places undue tension of the throttle linkage and the blade shaft. With the increased rate of opening the throttle, you will also be slamming the linkage against the stop much harder than normal when you are going through the gears. In my opinion, I wouldn't consider that good. The gas pedal is where it is at for a reason.

Like San said - we did it YEARS ago. No probs. I think your worrying about nothing. Youll break the crappy plastic pedal before anything else. Loads of folks do that.

 

[AmBo]

So wait, does this pull the pedal UP (towards you?)? As my gas pedal sits about an inch lower than my brake. and don't get me started on the clutch...

 

[007]

So wait, does this pull the pedal UP (towards you?)? As my gas pedal sits about an inch lower than my brake. and don't get me started on the clutch...

Yup. Its that simple.

 

[AmBo]

interesting...i'll have to check this out come the spring. Maybe i'll do it when I do my clutch adjustment as I'll be under the dash already as it is. What a horrible place to work. lol

 

['01 Steed]

This mod is completely useless unless you're looking for a difference in heal-toe feel. It nets zero performance gains! Anyone claiming gains in performance is lying to themselves. Show me the dyno results!

BTW, the throttle cables do NOT stretch. If there is slack in the cable, something else is wrong, possibly a bent throttle cable bracket or bent pedal. This cable is not a monofilliment line, it's braded cable...it doesn't stretch.

This "mod" has been out there for a long time, and has been de-bunked in numerous discussions.

 

[LaserRed01GT]

Like San said - we did it YEARS ago. No probs. I think your worrying about nothing. Youll break the crappy plastic pedal before anything else. Loads of folks do that.

I was a service writer for a Ford/Mazda Dealership in San Antonio, TX for a while. You would be surprised to know how many kids come in with their trucks and cars and have broken their throttle cable, linkage, or TB shaft because of doing this. Don't think so myoscopically and assume that just because yourself and a few others you know have had no problems, that some people out of the millions of other Ford owner haven't had a problem as a result of doing this. This mod borders on ricer mentality in my opinion.

Like Steed said above, the stock cable does not stretch. By placing abnormal stress on it like this, you are just asking to break something.

Is the gas pedal being lower than the brake really that awkward for you guys?

 

['01 Steed]

... This mod borders on ricer mentality in my opinion.

Bingo!

 

[007]

Don't think so myoscopically

Thanks, I'll try not to.

 

[GToddyT5]

Ford purposely set up the throttle linkage/cable like that. What you guys aren't thinking about is that when your motor is running and you are out on the road and you stand on the loud pedal, the motor will torque over to the passenger side. This places additional tension on the throttle cable. Just because you can stand on the gas pedal when the car is parked without the motor running and the throttle linkage/bell crank doesn't hit the stop, doesn't mean that when you get on it on the street that the blade isn't fully opening. Ford knows this and intelligently engineered the throttle cable to be slightly loose. It's not wise to "falsely" increase" the tension.

The throttle blade is slightly elliptical, not round, it is not made to go perfectly flat. The throttle stop on the factory throttle body stops the blade right around 87°. The throttle stop on a linkage like the Acccufab is specifically engineered to open the blade precisely 88° as per their technical info in their literature I have. The reason for this is because the throttle blade is not supposed to be perfectly flat. If you look closely, there is a hump over the linkage shaft that runs through the middle of the throttle blade. Keeping the blade 1-3° from going flat. This optimizes the air flow (aerodynamics) over this “hump.”

Additionally the PCM begins to switch to WOT tables after an 80% throttle angle and significant load, and even if you manage to open the throttle blade slightly more (which is highly unlikely under operating conditions) you will not gain any aerodynamic advantage whatsoever, you will actually lose some aerodynamic advantage over the throttle blade. So with these things in mind, this mod sounds like it may not be productive, and in fact counterproductive.

He just this thread.

 

['01 Steed]

You got that right! (spoken like Cosmo Kramer)

 

[propellerhead]

Is the gas pedal being lower than the brake really that awkward for you guys?

Yes. Besides, coming up with a way to take up the slack and a designing a bump stop was fun.

 

[40th GT]

Ford purposely set up the throttle linkage/cable like that. What you guys aren't thinking about is that when your motor is running and you are out on the road and you stand on the loud pedal, the motor will torque over to the passenger side. This places additional tension on the throttle cable. Just because you can stand on the gas pedal when the car is parked without the motor running and the throttle linkage/bell crank doesn't hit the stop, doesn't mean that when you get on it on the street that the blade isn't fully opening. Ford knows this and intelligently engineered the throttle cable to be slightly loose. It's not wise to "falsely" increase" the tension.

The throttle blade is slightly elliptical, not round, it is not made to go perfectly flat. The throttle stop on the factory throttle body stops the blade right around 87°. The throttle stop on a linkage like the Acccufab is specifically engineered to open the blade precisely 88° as per their technical info in their literature I have. The reason for this is because the throttle blade is not supposed to be perfectly flat. If you look closely, there is a hump over the linkage shaft that runs through the middle of the throttle blade. Keeping the blade 1-3° from going flat. This optimizes the air flow (aerodynamics) over this “hump.”

Additionally the PCM begins to switch to WOT tables after an 80% throttle angle and significant load, and even if you manage to open the throttle blade slightly more (which is highly unlikely under operating conditions) you will not gain any aerodynamic advantage whatsoever, you will actually lose some aerodynamic advantage over the throttle blade. So with these things in mind, this mod sounds like it may not be productive, and in fact counterproductive.

I think you just put an end to this gas pedal mod. Thanks for shedding the light!