thanx gona try this out when i get off of work!!!

 

I just want to chime in here, I had just now noticed this thread. I have read the front page and this one.

I had an 05 with the exact same problem, I got it in Oct of 04. Now I have an 06 and it doesn't have a problem with this.

That means three things to me that could have happened. New TPS (Throttle Position Sensor), Different Calibration, or a new program to the ECU. My car still has that floor it and then it jumps lag, but ZERO/NONE/ZIP of that dead spot on the pedal right at the begining.

My recommendation is to take this complaint directly to your service center with the information I have told you. Drive one of there 06's... the dead spot is not there. This has been fixed in the 06... at least in mine. Also approach them as stating it as a dead spot at the begining of the pedal throw, instead of a 'laggy throttle response'. The two are different in this case.

Let me know if you need any more information.

 

My '06 does it, and it's horrid. Combined with the drivetrain lash, and this car is nearly impossible to hold a constant speed, and be smooth. Driven manual trannies all my life, including both brand new and old cars, and this one is the worst.

It seems that after the "dead spot" in the pedal travel, the throttle bodies are opened rather suddenly, almost allowing too much fuel to enter. This just exacerbates the "jerking" when trying to maintain a constant speed, especially at slower speeds (<30mph). The drivetrain lash is a bit excessive too, but a smoother throttle application would no doubt help immensely. My WRX had pretty noticable drivetrain lash, but since the throttle was precise and smooth, it wasn't difficult to drive smoothly.

Whenever I'm sitting in traffic, the problem is most noticable. That's when you may want to apply just a touch of throttle, but since the TBs open so suddenly, you get jerked forward - that is, once you get past the dead spot on the pedal travel.

 

[quote="lo_bux_racer"]And speaking of "legal liability" I would caution people that messing with this piece could not only put you in danger if you don't know what you're doing and if you get into an accident, and the mod is found, you could be in a world of hurt.

Just my attempt at the Mattress Tag that you shouldn't remove

Scott

 

To the person with the "horrid" lag and lash issues: I would have a dealer look at it. The tC is by FAR the easiest manual tranny to drive I have had, and most of my cars have been manuals. I taught my gf to drive a manual in my mustang. She has driven it, my saturn and now the tC, and it is also the easiest for her. I can keep a smooth constant speed with no issue.. I just hold the accelerator steady and it holds nice and smooth, even down to 10 mph or in city traffic. No overly bad lash issues or anything.

And for a lot of people learning to drive a manual, a little throttle lag actually makes it easier. It keeps the rpms from dropping off as fast between shifts, making it match easier.

As for me, I do notice it if I try, but adapted to it within 10 minutes. As I have mentioned before, the only thing limiting the speed at which I can shift is the time it takes me to clutch and release. I think it does just fine. The downshifts are the only time I notice at all, and that isnt too bad.

Not bashing on anyone, but I do think people blow this WAY out of proportion. If it is as bad as some make it seem then they obviously have other issues that the dealer needs to hear about.

 

just posting to watch this

 

i've noticed that i still have somewhat of a delay even after doing this mod, but that has been offset because after the installation of my stiffy damper, i get much quicker power.

 

this mod was starting to kill my mpg. so in sayin this, i will act like the 3rd myth buster and say that this mod is BUSTED!
mods, lock this 1 up 4 me please?

 

Why? it works fine for me. all it does is position the pedal so when you hit the pedal it actually triggers the pot right away vs. having to depress the pedal an inch or so before the pot gets triggered.

And why would you ask the mods to lock it? that makes no sense.

 

i was kinda wondering the same thing about the lock.
i think he did the mod wrong

 

The only way it would kill you mpg is if you did it wrong. You most likely shimmed it too far so it always idles high. It wouldnt affect your mpg that much unless you leave it sitting idling all the time.

The original poster was addressing the pedal play, not the built it electronic lag. This type of mod will work fine as long as you take the time to do it just right. The idea would be to remove only the play in the pedal without increasing the throttle at idle. If you did it right, it should still idle just the same, but have no play.

 

i dont need this mod. i dont have that much of a problem after my ingalls etd was installed. i wish i could mod a throttle cable to the engine though.

 

The tough part would be getting a TPS and interfacing it to the right parts of the ECU if you switched to a cable. I am sure it could be done, but it would be a pretty intricate project I am sure.

 

Hey, could someone perhaps clarify the pic on the first page? I've stared at it for a while, and I feel like I'm looking at one of those 3D pictures, 'cause I can't really tell exactly what I'm looking at. Maybe it's because I haven't woken up yet, but I'm just not seeing the modification.

 

Sorry to bump an old thread, but this is definetly one of the best and simplesit mods ever. Should at least make learning heel-and-toe easier than what it is now. Thanks a lot Harmonic_tC.

 

I'm starting to think that maybe Toyota built in the throttle delay because it somehow makes it easier for first time shifters to drive stick... while it makes pro-shifters like me that have been driving manuals for 25 years very annoyed. I don't have any trouble mind you, but it's not a completely mindless process -- I have to devote some small part of my brain to listening to the motor, and always giving or letting off the gas .3 seconds before I normally would.

 

heel toe in a tc?
the way the gas and the brake are positioned it's harder than other cars... IMHO

 

I tryed this on my car and couldn't get it to work.. The idle would either be too high or there would be no difference at all. I guess I couldn't find anything the right size (even though I tryed like 5 different things)

 

why would you try to get a thread locked since you did the mod wrong?

 

Again, this does NOTHING for the delay. It only partially opens the throttle, thus taking play out of the pedal. Start the car.. let it warm up. Now, hold the throttle part of the way down.. then press it quickly.. the delay is still there, you are just starting in a different place.

I agree, this should make driving a stick EASIER for a new driver, not harder. The rpm drops more slowly this way, making shifts easier. As for me, I never notice it when I drive unless I try to. You learn after years of driving sticks and motorcycles to adapt to the different setups, so it really isnt an issue. And yes, heel toe is easy in this car, at least for me it is. That is when you notice the delay the most, but it has never been an issue. Bump the gas at the same time you push the clutch, downshift and release the clutch. Times it pretty well if you do it quickly.