TPS reading at WOT with 1ZZ throttle body?

[Neinris]

Originally Posted by sh0rtlife

the rev hang will fix itself outside of "cold starts", the trick is to keep playing with the idle screw and you can eventually get it to be consistent ..its why i loctighted a torx into the screw itself so i can make slight adjustments...at this point tho its settled in and i havnt needed to muck with it

for referance the idle screw DOSE NOT adjust the stop point or the butterflys position, it changes the "tension" on the butterfly and the electric motor to hold open or hold closed the butterfly, so you cant treat it like a true idle adjustment....once you understand that your changing the positive/negitive "spring load" on the motor zero point it starts to make more sense as to why some adjustments do NOTHING.

the cars ecu ultimately tells the TB motor how much "load" is acceptable to maintain ilde, so with the screw you can add or remove load but its not a linear adjustment and is best made after taking it for a drive

My Dee Dee is a manual, the rev hang I'm talking about is when I shift gears. There's about a second or two delay that the engine is still revved up even if the throttle pedal is fully released and the clutch pedal is fully pressed.

The screw does change the spring load, but it also DOES adjust the stopping point of the butterfly. It's the same principle as a single stage height adjustable suspension, where you adjust the spring perch to adjust the height ride. I don't have the 1ZZ installed right now, and I can tell that when I turn the screw, the butterfly's opening either get bigger or smaller when I adjust it.

[sh0rtlife]

Originally Posted by Neinris

My Dee Dee is a manual, the rev hang I'm talking about is when I shift gears. There's about a second or two delay that the engine is still revved up even if the throttle pedal is fully released and the clutch pedal is fully pressed.

The screw does change the spring load, but it also DOES adjust the stopping point of the butterfly. It's the same principle as a single stage height adjustable suspension, where you adjust the spring perch to adjust the height ride. I don't have the 1ZZ installed right now, and I can tell that when I turn the screw, the butterfly's opening either get bigger or smaller when I adjust it.

i thought it did too till i had the unit apart and played with it without the spring installed..its got no "stop" in it its 100% motor tension on it

i wonder if your rev hang is "board" issue..could also be a worn out spring for that matter as the spring is the only thing that brings the butterfly shut

[Calrenman]

Originally Posted by sh0rtlife

i thought it did too till i had the unit apart and played with it without the spring installed..its got no "stop" in it its 100% motor tension on it

i wonder if your rev hang is "board" issue..could also be a worn out spring for that matter as the spring is the only thing that brings the butterfly shut

Hello Short,

Are you running a 1zz? I am thinking of doing this mod.

I am wondering how the 1zz effects fuel efficiency and if the torque is increased? If it helps my car up hills without too much of a fuel use penalty I wish to give it a shot.