ok lets say ur sitting at a stop light, it turns green, u get ready to go but sometimes there is a huge drop in rpms which cause a jerk kinda like the clutch feeling like it slipped.

i rev to like 1500 and feather to go, and sometimes the RPMS just drop giving me a slight jerkish

 

your not being smooth with the gas and clutch.

 

so let the clutch out a bit slower and add a bit mroe gas maybe?

 

you need to develop a feel for where the clutch grabs. it depends on your rhythm. i tend to start hitting the gas just before i let the clutch in, not even looking at my rpms, it just becomes natural. practice at it and just don't over think it. you'll get better.

 

lol my uncle has been driving a stick for 15 years and he still has the jerk. he continues to tell me since he has been driving for 15 years, he knows everything. he told me this is normal

 

so if he told you this is normal, why are you worrying?

when you move away from a stop with a manual, you are revving up to 1500rpms with no actual load on the engine. it is doing nothing but rev. when you start letting in the clutch, the weight of the car is making the engine work. now, rpms are how many times the engine is spinning, and the transmission changes how many times the engine completes a revolution relative to how many times your tire spins. so your engine is spinning while the tires are not. the engine rpms drop because the tires are going from a stop to to in motion.

think about newtons law, an object at rest stays at rest until acted upon by an outside force. that jerk is the engine over coming the inertia of the car and forcing it to move.

 

its because there is a throttle delay with the tc because it is drive by wire. Blip the throttle before letting the clutch out. Takes a little while to get used to it.

 

so i just need to sync better. probably need to feather a slight bit more, and add some gas when rpms start to drop

 

it's normal if you don't care...I'd rather ride away smooth.

and redwar...I think you and him are on two different pages.

I understand what you're saying but it doesn't pertain to his question.

 

yea redwar, i have enough gas, i just need to press a bit more when the rpms start to drop and feather it a slight bit more

 

^ ^I think redwar may be right, and that it does pertain to this situation. The TBW sux and causes lots of various issues for many people. I'm able to drive the tC smoothly after learning it's idiosyncrasies, but have to say that it's more difficult to start off smoothly in that any other manual car I've driven in >30 years.

 

i have alot of friends that race scca and when i first got the tc i let them drive it and 4 out of five jerked it hard off the line. Throttle by wire. I get three quick revs in while lettting out the clutch and im smooth.

 

i think toyota really screwed up with adding the DBW system lol

 

Yeah as soon as the RPM start to drop the TBW closes the throttle more to compensate for the reduced RPM which cuts back the power more until it bottoms out. Might be better to plant the gas pedal at that point and work the clutch to control the RPM.

 

it makes more usuable power and better emmisions. When you first snap open the throttle on a older car it begins to suck in air and build power before the sensors can read whats going, it takes a second for the engine to adjust its fuel and timing, but with dbw the engine can adjust before anything actually happens. Its just a little primative right now.

 

this got a lil off topic but I noticed that the s2k's have dbw as well. I'm not too irked by it since I don't really race my car but I'd like the better throttle responce without adding several hundred dollars worth of goodies.

 

How many miles are on the car?

 

like 700

 

No worries then.
My clutch was a bit 'grabby' well into the 1500 mile range. By then I had gotten used to the throttle delay.