civic vx: what does VTEC-E feel like when it kicks in?

[CHILD]

Because that's where the sohc motors start to pick up power. The vtec-e crossover isnt even at 2500rpm btw.

 

[dlb]

Because that's where the sohc motors start to pick up power. The vtec-e crossover isnt even at 2500rpm btw.

when is the vtec-e crossover? 2500 rpm is what i found here

http://en.wikipedia.org/wiki/Honda_D_engine#D15Z1

and appeared consistent with my findings today.

 

[civicfan111]

2500 is when the sohc power band starts, vtec engagement is about 5500rps..

 

[lethal6]

The vtec-e does cross over earlier as it is designed for lower RPMs, but it is NOT anything you are going to feel. It was designed for saving fuel.

You are feeling the sohc starting to hit it's power band NOT the vtec-e. Sorry, it's not a B-series where there is a noticeable pull and change in tone.

 

[xxBLOOD88SHOTxx]

he is feeling the second intake valve open fully at 2500rpms, the larger cam profile is still engaged at 5500 rpms. Vtec-e and 3 stage do the same thing just two slightly different ways

 

[CHILD]

when is the vtec-e crossover? 2500 rpm is what i found here

http://en.wikipedia.org/wiki/Honda_D_engine#D15Z1

and appeared consistent with my findings today.

it's between 2500-3000rpm depending on load. It won't be a consistent 2500rpm unless the conditions are exactly the same every time you accelerate.

 

[dlb]

The vtec-e does cross over earlier as it is designed for lower RPMs, but it is NOT anything you are going to feel. It was designed for saving fuel.

yes, vtec-e is designed to save fuel by operating with basically one intake valve at low rpm. however, at a designated rpm crossover point, the second intake valve will begin opening fully, resulting in increased power. i don't know how anyone can say a driver won't notice when 4 more intake valves start opening.

i've driven lots of sohc vehicles and getting into an engines power band is very different from what i am describing in the vx. when the rpm climb into an engines power band, it is a smooth transition. what i am describing with the vx is a very clear on/off, sudden engagement.

here's a link that explains vtec-e pretty clearly. not specific to the d15z1 but the same principles apply.

http://www.b18c5eg.com/VTEC/sohcvtece.html

 

[lethal6]

yes, vtec-e is designed to save fuel by operating with basically one intake valve at low rpm. however, at a designated rpm crossover point, the second intake valve will begin opening fully, resulting in increased power. i don't know how anyone can say a driver won't notice when 4 more intake valves start opening.

i've driven lots of sohc vehicles and getting into an engines power band is very different from what i am describing in the vx. when the rpm climb into an engines power band, it is a smooth transition. what i am describing with the vx is a very clear on/off, sudden engagement.

here's a link that explains vtec-e pretty clearly. not specific to the d15z1 but the same principles apply.

http://www.b18c5eg.com/VTEC/sohcvtece.html

You are mistaking vtec-e from the d series to the b series. B-series is noticeable d isn't.

 

[CHILD]

Every power band especially in stock form isn't smooth all the way through. If it was, there wouldn't be a need for tuning.

 

[lethal6]

Every power band especially in stock form isn't smooth all the way through. If it was, there wouldn't be a need for tuning.

Amen to that.