ignitionr34

hey got my tc 2 weeks ago and i love it. i let my friends try it out (one's got a spec v and another got an si) and they are pretty expereienced when it comes w/ cars, they also like my car too, but they noticed one thing it has slow throttle response compared to their cars, is there ny thing to do about this?? what i need to get aan afer market throttle body or what??? what did u guys do to fix this? or does it even neeed fixing?

slammed

some people complain of a slight delay because our cars dont use a throttle cable. A ground wire kit may help this a little bit.

RacingSolution

They say ours will is more accurate because we do not use a cable.

Somnambulated

Yeah, it does have a lag. I have to floor it, and can almost count the seconds before I'm ready to change lanes or pass someone.

I think it might be that way for safety reasons.

The_Instigator

Yeah...whiplash pretection cuz our cars are SOOO fast!!!

Dat_Dude

It is called the Drive-by-Wire system. It is one of the best techniques utilized for engine management. That similar to an aircraft's fly-by-wire. If you were to slam (perse) on the accelerator, you have created a spike in the intake vacuum system. Like a huge disruption in suction equilibrium in the intake (vacuum system). By doing that, then engine will respond in a negative way. It's like choking the engine for a split-second then it adjusts to the radical change in vacuum. The drive-by-wire system ensures that the engine doesn't undergo that type of scenario.

To explain the drive-by-wire system, it is an active measuring & conclusion system. If you put the throttle at a certain position, the computer will analyze that position data and compare with the vehicle's current data. (acceleration, speed, braking) So if you are going down a hill and the computer recognizes you are accelerating at a rate of 2 mph at closed throttle and you apply gas to accelerate which the computer recognizes as a rate of 3 mph from closed position on the gas pedal, the computer will make the adjustments to add 1 mph rate of acceleration to the already 2mph acceleration rate instead of adding 3 mph to the 2 mph acceleration rate = 5 mph acceleration.


All in short, you don't have the final say in what the throttle should be at, the computer decides what is the best throttle position. It will ensure the engine is under a ideally would be considered "linear operation". (steady change)

pureXtC

the only way i think to reduce any type of lag in a drive by wire setup is being able to reflash the ecu of the car. but i dont even know if they have something like that for the tC.

superbill

yeah i was thinking the same

Dat_Dude

an article i found on drive-by-wire

http://www.pitt.edu/~tas36/interesting%20event.html

you can find that the car's nowadays have these systems. However, the term itself does imply future type applications. For the existing ones, throttle linkage, abs, are examples of drive-by-wire. The term means that the computer will direct the vehicle operation by wires and digital signals. Articles you will find will be more directed to computerized network interfaces and interoperability.

ignitionr34

wow thanx for the input, that really explained everything alot

Dat_Dude

glad to have helped!

lo_bux_racer

Get a Fidanza flywheel and your problem will be solved. No more lag or waiting. It isn't the drive by wire that's the problem, it's too much rotating mass.

Even with a light flywheel I really think this engine would benefit from a lighter crank and precision balance to ditch the counterbalancers. I'd suffer a little more vibration to have better throttle response.

metalranger33

dgHotLava

repost...

https://www.scionlife.com/forums/viewtopic.php?t=72224

locked.