I know this has been discussed at great length in other posts but I was reading Autoblog.com today and ran across an interesting article. It seems that there is an available ECU reflash dealing with the Camry drive-by-wire system and reported throttle delay. The source article was by subscription only so I don't know if it was for four- or six-cylinder models or both. Does anyone know if this is available for tC's since we share essentially the same 4-cylinder? Check it out here:
http://www.autoblog.com/2006/10/17/c...e-it-the-boot/

 

same 4 cylinder but do we share the same ECU?
i agree there is quite a bit of lag hopefully this reflash applies to us also

 

I was reading the same thing...maybe one of the dealers on here can chime in? Perruzzi? Sparks?

 

Actually, I have a question for any 07 tC owners. Do you notice a slight delay/lag with your throttle? I'm wondering if Toyota did anything for this years model.

 

I've owned a 06 and now a 07 and have noticed very little improvement in throttle response on the 07'. I believe the ECU map is different however, which is also why you can't put the current TRD supercharger on a 2007. TRD has to make some changes to it before its ready for 07 models. Also the 2007 is ULEV II compliant as opposed to ULEV I in the 05-06's. I don't know if that would affect performance or not though.

In any case I still have some throttle lag.

 

if this would apply to the tc that'd be great...i really hate the delay

 

Please people... There really is no throttle lag due to the drive by wire. If you get a vacuum gauge then you will see that it is almost instantaneous but the actual acceleration you feel takes longer. This is due to the heavy drive train (i.e. flywheel, clutch, and everything else). If you want throttle response then you should have gotten a car that was more tailored for racing/sporty driving.

 

I agree. . . the throttle seems plenty responsive. . . but the drivetrain (probably just the flywheel) is too heavy. It really makes revs drop slowly, which is what causes the majority of my shift jerkiness. Simply pause briefly to let the revs drop when after you clutch in. You'll see exactly what I mean.

 

I find nothing wrong with "actual" throttle response. Like OuterHeaven said, it's more so due to the heavy flywheel causing your engine to float between gears (I posted about this in another thread). It's annoying to me, as i'm used to shifting quicker.. but i'm definately sure it's not related to the DBW system.

Jay

 

Yes if you remove the balance shafts (ZPI is working on a kit for this) and install a lighter flywheel the throttle response should increase dramatically. Also changing the crank pulley and other pulleys for lighter ones should help with this also. After that there really isn't anything you can do short of an individual throttle body setup (or maybe even an intake manifold that has shorter velocity stacks or just less volume in between the throttle body and the actually intake ports).

 

there is an easy way to fix it. strap a turbo on the thing and your throttle response should get better. its not due to DBW its due to lack of HP and FT-LBS and excess weight.

 

I concur the FBW system does not seem to be the problem. The tC is not designed for high performance from the factory, however these two parts will help fix that. I've heard the pully is hard to install.

ClutchMasters Lightweight Flywheel: Approx Cost $395

Agency Power Lightweight Crank Pulley: Approx Cost $134.95

 

$395 for a flywheel??? Most people on here shouldn't install a CAI let alone a flywheel... add a few hundred bucks for install

 

I hope you're kidding; or you just don't know what throttle response is AT ALL.. A Turbo would dramatically INCREASE throttle response.

 

Most of us aren't race car drivers, i'd prefer a smoother operating vehicle than ultra throttle response.

 

For a daily driver you do not want to go over board with the reduction in reciprocating mass. I would say a moderately lighter flywheel (or even a lightened stock flywheel) would give a nice sporty feel but would not affect drivability so much that it would be harder to drive. In all reality it is really user preference. Anyone can have an ultra low reciprocating mass engine and still like driving it everyday while another person may not like it. It is just like clutches it is really up to the user.