Ideal way to drive to take advantage of VVT-i

[Happily1986]

Hi everyone, I suppose that in Singapore since Toyotas are so common, the permeation of VVT-i is also rather extensive. I would like to seek feedback on your opinion on how best can one do to extract the maximum benefits out of VVT-i.

 

That is to say, what kind of driving pattern do you think should be employed on a vehicle with VVT-i technology so supposedly the vehicle will be as fuel frugal as the technology would allow it?

 

Below is a link to an article in which the author has supposedly shared his opinion on the ideal way of driving a VVT-i enabled vehicle.

 

Article

 

A central salient point from the article read as follows,

 

 

[Beehive3783]

No. I don't see how you can control gear shift timings on an automatic car unless there is a sequential gearshift option.

[Happily1986]

Well from my experience, the gear shift point appear to be delayed when i floor the accelerator. Conversely when i feather the throttle, the gear shift point appears to be earlier i.e. ~ 2000rpm.

 

In order to make use of VVT-i, is it advisable to either

 

1.) feather throttle always, i.e. gentle acceleration till cruising speed is attained

or

2.) reasonable/brisk acceleration by opening the throttle more during pickup and feather throttle once cruising speed is reached.

[Mini-itx]

Well from my experience, the gear shift point appear to be delayed when i floor the accelerator. Conversely when i feather the throttle, the gear shift point appears to be earlier i.e. ~ 2000rpm.

 

In order to make use of VVT-i, is it advisable to either

 

1.) feather throttle always, i.e. gentle acceleration till cruising speed is attained

or

2.) reasonable/brisk acceleration by opening the throttle more during pickup and feather throttle once cruising speed is reached.

 

When you go WOT, the ECU will detect it as you need power thus the shift point will be delayed. For better FC, use as little WOT as possible caues you will run rich and go into open mode.

 

IMHO, feather throttle is better than brisk acceleration because ECU usually tends to dump more fuel than necessary to give you power. When you feather throttle, you may be able to stay near stoichiometric as ECU sense that you are in "economy" mode. Of course this is dependent on ECU setup so I don't really know.

 

For my case, I setup my ECU to run that way to save fuel.

[Aleshier123]

good idea.

[Nf0rc3r]

For manual, Almost full throttle and change gears at low RPMs will yield highest km/l

For auto, since u can't use almost full throttle and change gears at low RPMs as they are exclusive events, U will choose light throttle and low RPMs since low RPMs yield more gain than throttle loss.

[Mini-itx]

For manual, Almost full throttle and change gears at low RPMs will yield highest km/l

For auto, since u can't use almost full throttle and change gears at low RPMs as they are exclusive events, U will choose light throttle and low RPMs since low RPMs yield more gain than throttle loss.

 

Are you sure? I seriously don't think going full throttle and change gears at low RPM will help save fuel unless your ECU is really tuned for that.

[Wishcumstrue]

Well from my experience, the gear shift point appear to be delayed when i floor the accelerator. Conversely when i feather the throttle, the gear shift point appears to be earlier i.e. ~ 2000rpm.

In order to make use of VVT-i, is it advisable to either

1.) feather throttle always, i.e. gentle acceleration till cruising speed is attained

or

2.) reasonable/brisk acceleration by opening the throttle more during pickup and feather throttle once cruising speed is reached.

 

Well said in layman terms based just on your observant experience.

The thread title is a little misleading as engine alone does not determine the vehicle's all over FC.