Hondaciv95VX

I feel Like I know a fair amount about the Hondas I <3. But I have this friend who is set on telling me a 2, or even 3 stage vtec is possible, I say it is not, ask him to explain how it works (knowing full well it cant work). But my question is, is this unheard of 2, or 3 stage Vtec even real? I dont think it is, Id just liek to have somone back me on it, or leme know how it works.


THank?

Azn Kenny

I've heard of different stages of VTEC too but I'm not exactly sure how the cam lobes work.

Hondaciv95VX

I havent heard of differnt stages of Vtec...I dont think there are "stages" either it kicks in and changes the cam lobe, or it doesnt kick in, and stays on the same lobe of the cam?

eg-owns you

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cambopheonix56 &raquo;</TD></TR><TR><TD CLASS="quote">GSR has a 'dual stage' engaugement. The short runners on the intake manifold open at 4600 and vtec at 5700. So therefor its not as loud.</TD></TR></TABLE>

from what he said i have allso read that to but there is no 3 stage vtec like wtf would that even be it would hit vtec then hit a higher vtec and then blast into full vtec like wtf i know there stage 1 2 3 cams

Sleepy_Red_hatch

2 stage vtec.

found in japanese D15B motors (one of the 4 varieties)

it runs on one intake valve like vtec-E until 3000 ish rpm and then both intake valves work, and then engages higher lift at the normal vtec engagement point (4500?)

HX motors do this alltogether at 4500 i believe

polishrifle

i-VTEC works by changing the VTEC engagement point based on engine load, tps, etc. So in a way it has infinite "stages."

Jonknee

wait so, what type of vtec would be more convenient for which type of driver, or is vtec just 5hp useless crap.
i think some of us keep thinking vtec is a honda turbo and brag.

polishrifle

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by La-Quiete &raquo;</TD></TR><TR><TD CLASS="quote">wait so, what type of vtec would be more convenient for which type of driver, or is vtec just 5hp useless crap.
i think some of us keep thinking vtec is a honda turbo and brag.</TD></TR></TABLE>

VTEC simply allows an engine to have both an economy profle and a racing profile. Think of it this way, if you dyno your car to run on one intake valve and for gas milage, then on all valves for power; take the two curves, lay them on top of one another. The VTEC point is where those two curves intersect. That way you don't have to compromise, you can have your cake and eat it too.

Jonknee

sweet thanks for schooling me dude.

HXvtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sleepy_Red_hatch &raquo;</TD></TR><TR><TD CLASS="quote">2 stage vtec.

found in japanese D15B motors (one of the 4 varieties)

it runs on one intake valve like vtec-E until 3000 ish rpm and then both intake valves work, and then engages higher lift at the normal vtec engagement point (4500?)

HX motors do this alltogether at 4500 i believe</TD></TR></TABLE>

true but i thinks the 2nd engagment is higher. mine is usually at 5000

EgSalad

iTrader: (1)

Answers all your questions about vtec:

http://en.wikipedia.org/wiki/VTEC

mike1114

iTrader: (1)

There are cars that have two, and I think three stage vtec.

It's not for performance, it is for emissions and mostly fuel economy. What happens is the ecu creates a slightly lean condition in all cylinders to improve fuel economy. I think the VX model hatch has it and there is a jap or european one that has the three stage.

Sleepy_Red_hatch

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike1114 &raquo;</TD></TR><TR><TD CLASS="quote">There are cars that have two, and I think three stage vtec.

It's not for performance, it is for emissions and mostly fuel economy. What happens is the ecu creates a slightly lean condition in all cylinders to improve fuel economy. I think the VX model hatch has it and there is a jap or european one that has the three stage.</TD></TR></TABLE>

2 stages of vtec or 3 overall stages....(one valve intake/two valves intake/higher lift)
the HX has this, one of the 4 kinds of JDM D15B's have this

vtec-e....(one intake valve/two intake valves)
the VX has this, one of the 4 kinds of JDM D15B's have this

vtec...(low lift / high lift)
the ex/si has this (even the 99-00 si, but in the dual cam flavor)...one of the 4 kinds of JDM d15B's has this

non-vtec (same cam profile, ALL the time)
CX/DX etc have this, and the last of the 4 kinds of JDM D15B's have this

Hondaciv95VX

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sleepy_Red_hatch &raquo;</TD></TR><TR><TD CLASS="quote">2 stage vtec.

found in japanese D15B motors (one of the 4 varieties)

it runs on one intake valve like vtec-E until 3000 ish rpm and then both intake valves work, and then engages higher lift at the normal vtec engagement point (4500?)

HX motors do this alltogether at 4500 i believe</TD></TR></TABLE>

Yes, my car pretty much has this same motor, d15z1. Vtec-E...But this is not what I mean. I know about the d15B also.

What I mean, is Those are not 3 different Vtec engagment points, which I dont even think is possible to have. THose are different opperating modes of those motors.

I think you all proved my point, thnc.

dohctor_B

Like other people have said, the JDM D15B vtec has 2 stage vtec... I beleive in the 96-00 JDM version of that engine. I remember seeing a picture of the Vtec solenoid and it looked different than the rest (it looked like it was 2 solenoids frankensteined into 1 unit) don't know if that helps

Jonknee

can any one explain which car holds the d15b, like si xsi or wtf. u know.
i wish there was a huge chart of which chassis holds which engine and such.

lemon_juice

1stage is considered non-vtec, it stays in one state.
2stage is the usual v-tec, has a low profile and a high profile
3stage is found in those fuel savers, low rpms run off 12 vavles, then low profile, then high profile.

the benifits of vtec is the ability to have 2 different cam profiles, one for top end and one for low end. unlike non-vtec, having two profiles makes for a good streetable motor with the benifits of a hard pulling top end. if a non-vtec had high profile cam, the top end would be good and the low end will suffer, making stop and go traffic bad.

the benifit of a 3-stage vtec is all this and fuel economy. although these motors dont usually put out the best numbers, they are decent. (vx-92hp from factory) i think from idle to about 2500 rpm the motor is running less intake valves and low cam profile. after 2500 the intake valves are utilized but the motor is still running off of the low cam. after 4500(if i remember correctly) the motor switches over to its high profile.

ive only heard of these 3stage vtecs in sohcs.

The_Head

I thought the D15Z1 only had VTEC-E, switching from 12 to 16 valve operation only.