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 Proton Prevé V6, ► Official Discussions for Proton Prevé

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duan
post May 3 2012, 12:55 AM

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kristof reply from autoworld

QUOTE

I have several question regarding CVT for exora bold(CVT3) and saga flx (CVT2):

Q) 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.


A) 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.


duan
post May 3 2012, 01:11 AM

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QUOTE(FrostLance @ May 3 2012, 12:58 AM)
newer  batches preve will have better FC since power delivery at lower RPM like the new test car i drove. The early batch quite weird, kene tekan alot baru ada power skit.
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u mean 200Nm when RPM < 2000? is it suitable when driving in bumper to bumper condition?
duan
post May 6 2012, 01:12 AM

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QUOTE(shareDARK @ May 6 2012, 01:04 AM)
mine town driving (KL) 26 litre about 200km.
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IAFM+ or CFE ?
duan
post May 6 2012, 01:47 PM

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QUOTE(izputra @ May 6 2012, 01:25 PM)
Yaa..haha. I've learn this also during my college time..about 13 years ago..lolz

So moral of the story..if u are FC conscious, kindly drive at moderate speed  tongue.gif so that most of your petrol will be used to move the car..not to overcome aerodynamics drag
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well that's the beauty of turbo you can increase volumetric efficiency and thermal efficiency by getting its energy from the exhaust gases instead of petrol rclxms.gif

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