Ok, so I've tried to understand this thread on AW, but honestly, I hate their format.

My assumption is that they are saying 3/4 (or near) throttle is optimum for the S4, is this true?

Not that it doesn't make sense. Based on my limited knowledge of the physics and theory of internal combustion, increased fuel delivery and increased power are not going to be linear in relationship and eventually you could arrive at a negative, or decrease in power if too much fuel is introduced.

AW: 3/4ths Throttle Discussion by S4 MadMan 08/28/02

 

optimum for what? Only 3/4 of the cars available acceleration?

I'm not sure I understand what the question is... and yes, their format *does* suck over there!

 

absolutely silly... if 3/4 trottle was faster, you think that APR/AWE/GIAC would program the setup into their chips...

 

I'm glad no one else understands what they are trying to say, but I'm still curious.

What I'm thinking is that the adjusted down throttle position would be optimum for peak power output. Because of the fire triangle formula of Fuel + Oxygen + Heat = Fire.

Right? At some point, you are going to hit a peak of fuel in to power out. Say for example, every 1cm increment of gas pedal (with 10cm travel available), you get 10% increase in fuel delivery, but once you reach 8cm/80% fuel input, your air to fuel ratio in the cylinders is maxed out. Beyond that point, any increase in fuel into the cylinder nets you zero increase in power since you've reached the maximum amount of fuel for the oxygen available to burn in the cylinder. In fact, the additional fuel could potentially decrease your power output based on the physics of energy(heat), the unburned fuel would obsorb energy.

Just my thought experiment on the original post I read. Maybe I'll join their boards and inquire. Who knows, maybe the act of posting on the boards will help me understand how the format functions. Maybe they have a process map...

Good Thursday to you all.

 

I think the point is to NOT get throttle cut & get the best LTFT & CF's. So it smoother & pulls better do to not having any TC.

It's a tuning thing, & not really a more A/F thing.

 

I get what your saying, and most cars are tuned to run a tad rich at WOT from the factory. That way you don't go blow up your engine when you floor it. Now when you get a tune, you can have it leaned out so that you get the right A/F ratio at WOT and keep it there throughout the powerband.

Factory tunes leave a lot to be desired, they are safe tunes to keep warranty costs to a minimum.

 

There format sucks a**. Anyway what i took from it was some guy thinks that he gets more power from adding a rubber stop tho his throttle cause he can't figure out how to drive. It seems like he is just bogging the engine on launch by just slamming the throttle to the floor. So this Mod as they call it prevents him from doing this. I don't know it seems to me if you know how to drive your car you won't have this problem.

 

Yeah pretty much.

 

and now my head hurts...

 

my car goes faster when i push the pedal to the floor.....lol