I noticed how slow my rpms float between gear changes compared to my girlfriend's 06 tC.. Any evidence or info regarding the flywheels in each year? It's making me shift like junk because I expect the rpms to fall a bit quicker between shifting. Driving her 06 is much different than my 07.. shrug.. I only have about 400 miles.. maybe it's still "breaking in" ...

Jay

 

I thought that was because its not throttle by wire anymore? could be wrong though.

 

99% of the delay people feel in all of the tC's is due to rotational mass. People with a lighter flywheel verify the virtual elimination of it afterwards. I doubt they used a heavier one. But it should make shifting easier, not harder. The engine does not slow as much between gears, thus making it a smoother transition when you let out the clutch.

 

I say just adjust your driving to your car. If the 07's have heavier flywheels then I applaud you for catching this interesting change.

 

The revs do drop slow. . . and it does make shifting tough. . . especially when upshifting shifting quickly.

 

I will eventually adjust to the lengthier float time between gears.. I'm sure this is due to a flywheel in the ballpark of 30lbs.. I do know a heavier flywheel is beneficial to "noob" drivers.. I'm not used to letting the clutch out way before the rev match.. This is causing me to slip the clutch more so than i'd like. However, MOST of the time I don't have a problem as long as I remember to shift slower ;)

Jay

 

WTF? You saying '07 has a throttle cable?

 

They did not switch to a cable. And the stock flywheel is more in the range of 20 lbs if I remember correctly, not 30. I see absolutely no reason they would have added a heavier flywheel unless they wanted to make it better off the line.. but I have heard nor seen any other evidence to support them raising the weight of the flywheel.

 

In addition, we also have dashpots which hold our RPMs between shifts to keep the revs from falling instantly

 

i have also experienced this, i thought the was the computer holding open the throttle longer not a heavier flywheel

and what is a dash pot?

 

exactly what you just said

It's actually there to aid in upshifting so that your revs do not drop as quickly.

 

A dashpot is actually a mechanical device. A shock absorber uses a type of dashpot for example. People adapted the term to a type of electronic control. I really do not think there is a built in cushion (not that you can feel or notice.. there will be some to keep the throttle from slamming shut too quickly) on our systems, based on the fact that those with a lightweight flywheel report that the "delay" in response practically dissapears. Rotational mass in and of itself acts to cause this same phenomenon.

 

Okay then it's definately the dashpot that i'm noticing, it's annoying, I don't like it! Its causing me to slip the clutch (pulling my rpms down by means of slipping) rather than letting me rev match. I'm a very very good clutcher, I can rev match, I don't need a training wheel on my clutch thank you very much.

So let me get this straight, they added dashpots to 07s but not 05/06?

Jay

 

No... I am sure it is just the regular crappy drive train. Between the flywheel and the balance shafts that are made for the Camry owner crowed then it is obvious that reducing reciprocating mass was not a priority.

 

There is no difference in the throttle delay between the 05, 06 and 07. They are the same setup. Like outer said, they just used a slightly heavy (for this application) flywheel in all of them. And there is one good reason. The heavier the flywheel, the smoother and more powerful feels on launch. A lighter flywheel will rev and rev match quicker, but you will need to launch at a higher rpm to get the same effect.

 

just out of curiosity, but doesnt having the RPM's hang around wear out the clutch more on upshifts?

 

yes, higher RPMs and/or longer times to slip the clutch cause more clutch wear

I don't think there's a problem with the "delay" of the RPMs dropping... I find its nearly perfectly timed for normal driving. Why would you need to match the revs with the clutch? Just time it right and dump the clutch at that right time while adding a tiny bit of gas (to keep the revs from dropping too much), and you can get it 100% smooth.

It's all about the timing

 

Wouldn't it makes sense that if the clutch is spinning at close to engine speed, there will be less wear on it than if it's engaged at a speed that's different? If the revs drop much on an upshift and you don't give it enough gas to match rpms, you'll slow down when the clutch is engaged. They've tried to make it so people don't need to "match revs."

 

It really isnt bad for it, if the rpms are matched, or close to it, there is less less shock on the clutch when you let out.. hence the reason you shift smoothly so there is no jerk. So as long as you are way out of synch (like having the throttle wide open on an upshift) you are doing good.

 

hey i work at a scion dealership. the only things that i have noticed about 07 Tc's are cosmetic. it has different cats to meet emisions. i have seen no flywheel changes. the throttle is still by wire not cable. The only change is the VVT-i starts to open about 400 rpm's earlier. i felt a differnce at first and didnt believe it so i checked with a diagnostic tool compaired to mine and it does. O and has anyone seen the 07 base model it has a glass roof but it doesnt open and it comes with steelies. i got a set of steelies for mine just because i wanted track wheels, but it lloks soo horrible and cheesy its only 14,9 though