QUOTE(dares @ Apr 19 2012, 02:41 AM)
Just in case there are any confusion why use the handbrake as opposed to the footbrake, as recommended by mat79, that is because the wet clutch opens (disengages the cvt from the engine) when...
1. The gear is in N or P
2. The brake pedal is pressed (my understanding is it will not be opened as wide as in condition 1, therefore still creating drag.)
So, from Kristof's explanation, my understanding is that, when you are pressing the brakes, and release it to press the gas pedal, the clutch needs time to close, hence the lag experienced. If you dont want to feel this throttle lag, you either...
1. Wait a moment before pressing the gas pedal, by when the clutch will be completely closed, or
2. use the handbrake to stop the car from moving, but keep you gear in D. This way the clutch never opens, and once you relase the handbrake the car is ready to go right away.
Mat79,pls correct me if I am mistaken.
QUOTE
I have several question regarding CVT for exora bold(CVT3) and saga flx (CVT2):
1) I notice that exora bold still roll back on even slight /gradual slope(not-too-steep slope). Normal auto gear vehicle only will roll back when the slope is too steep, if it is not steep enough, it's will lock at there. Is there anyway to make CVT lock it when reach slight/gradual slope? It is kinda dangerous esp for new driver.
You are correct. This is a know "issue", but is a design feature actually. Two things contribute to this:
First thing is what we call idle neutral, unlike all regular older AT's that have a constantly dragging torque converter or clutch, we open our clutch (a wet clutch, more pressure = more drag, even more pressure closes it) almost completely when you are pressing the brake and standing still. this way fuel is saved. If you release the brake a little time is needed to apply pressure to our clutch again. that is when you roll back a little, rollback only occurs on hills steeper than 10%.
secondly the engine cannot deliver a lot of power idling, when aircon is on, heavy car, on a hill, we can start closing the clutch in order not to roll back, but that will cause the engine to stall. When you apply trottle you will notice first the clutch opens a little bit so engine revs up, than we start closing the clutch, during revving up, you can encounter rollback.
What to do? use handbrake in stead of brake, this way we not shift to neutral (we only read regular brake signal not handbrake), use enough trottle, this way the engine produces engough power to close the clutch in one move.
http://forum.autoworld.com.my/index.php?sh...pic=103354&st=0post #3