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Difference Between "d", "b" & "s" Gear In Vitz (1000Cc)


rosh78

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  On 5/9/2011 at 5:48 AM, Praveen said:

i personally call them Bull $#!t. you barely can drive on D. mind you i dnt own a vitz but a bit bigger car with the same engine which i'm ashamed to mention.

Machan are you referring the Belta 1000CC? :unsure:

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  On 5/9/2011 at 6:50 AM, Elvis_Pil said:

Is not S for L as in older models? For load driving etc.

Yeah, I thought it stood for Second. But I got that info off a forum. What kind of sport mode can a Vitz have anyway?

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funny, cause i've been in an allion 1800 and you can definitely feel a power difference from D to S...and its done speeds of over 120 km/h on S so kinda defies it being a low gear??? Same story with a Honda jazz 1300 and toyota vitz 1300.. the RPM's stay the same when you floor it on either D or S, (just under 6000) :unsure: But then again I dunno anything much about CVT's, :mellow:

Edited by virensti
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  On 5/9/2011 at 6:49 PM, virensti said:

funny, cause i've been in an allion 1800 and you can definitely feel a power difference from D to S...and its done speeds of over 120 km/h on S so kinda defies it being a low gear???

generally, Sports mode on an automatic means the ECU changes up at higher RPMs than what it would normally do. So you have more acceleration at the expense of more more noise, more vibration, more engine wear and more fuel consumption.

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  On 5/10/2011 at 1:46 AM, Sifaan said:

generally, Sports mode on an automatic means the ECU changes up at higher RPMs than what it would normally do. So you have more acceleration at the expense of more more noise, more vibration, more engine wear and more fuel consumption.

but this is cvt we're talking bout mate.. no gear changes.

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  On 5/10/2011 at 5:32 AM, virensti said:

but this is cvt we're talking bout mate.. no gear changes.

true; there are no discrete changes because there are no gear wheels; but the gearing ratio is still being changed by the CVT box

when you accelerate, ECU has to balance how much to deliver from engine increasing rpm and how much to deliver from gearing ratio changes.

In Sports mode, the balance can shift to allow the engine to develop higher rpms

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  On 5/10/2011 at 7:57 AM, Sifaan said:

true; there are no discrete changes because there are no gear wheels; but the gearing ratio is still being changed by the CVT box

when you accelerate, ECU has to balance how much to deliver from engine increasing rpm and how much to deliver from gearing ratio changes.

In Sports mode, the balance can shift to allow the engine to develop higher rpms

I second this....there is a definite RPM increase when you shift from D to S without changing the throttle position on a CVT.

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  On 5/10/2011 at 1:46 AM, Sifaan said:

generally, Sports mode on an automatic means the ECU changes up at higher RPMs than what it would normally do. So you have more acceleration at the expense of more more noise, more vibration, more engine wear and more fuel consumption.

So basically the engine just revs a few thousand rpm more? So why include an S mode then? You can do that with your foot yeah.

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lol such a simple thing that everyone seems to be confused on. 'S' mode is a hold mode- so basically its for times when you need the car to hold the particular gear ratio its currently in. So in the case of a load drive- you want it to stay in a low gear with high revs and in case of highway drive where performance is needed you'd want it to stay in one particular gear- perhaps around the ratio of a typical 3rd gear. This is the way I'd assume it to be in a CVT box - non CVT should be different.

I'm no expert it automatics though :)

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  On 5/10/2011 at 8:48 AM, Big_D said:

So basically the engine just revs a few thousand rpm more? So why include an S mode then? You can do that with your foot yeah.

I don't recall it being that much of a difference, probably 500-1000 rpm more (for conventional auto; dunno about CVT)

but that's if we're talking about switching threshold. if we mean engine rpm at a particular car speed, then the difference can vary a lot (especially when the normal mode has just shifted up, and the sports mode has not yet shifted up).

by "do it with your foot" did you mean kick-down? that's different (purpose and implementation)

else not sure what you meant?

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  On 5/10/2011 at 9:12 AM, Sifaan said:

I don't recall it being that much of a difference, probably 500-1000 rpm more (for conventional auto; dunno about CVT)

but that's if we're talking about switching threshold. if we mean engine rpm at a particular car speed, then the difference can vary a lot (especially when the normal mode has just shifted up, and the sports mode has not yet shifted up).

by "do it with your foot" did you mean kick-down? that's different (purpose and implementation)

else not sure what you meant?

Well since engine speed can be controlled by the throttle, you can "tell" the car where to shift. But if sports mode only enables the car to shift at higher rpm, why include it? Or am I missing something?

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  On 5/10/2011 at 11:38 AM, Big_D said:

Well since engine speed can be controlled by the throttle, you can "tell" the car where to shift. But if sports mode only enables the car to shift at higher rpm, why include it? Or am I missing something?

I think I understand your confusion...

One of the ways of talking of car performance is the 0-60mph time (and IMHO it's a more useful way than just talking of the engine HP (which is anyway only at a particular rpm), because the real application of that power depends on the car weight, transmission, aerodynamics, etc.)

On Sports mode, the car will deliver a better 0-60 time than on normal mode.

And it does it (in the case of non-CVT autoboxes) by exactly the same means as you would in a manual car if you wanted to reduce the 0-60 time: delay upshifts. However the ECU won't redline the engine like is possible with a manual

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