Zs with VTEC????

1slow370 · 04-26-2010, 03:51 AM

yeah vtec is just a simple bitch version of VVEL in that it just increases the lift and duration of the camshaft above a certain rpm when an oil activated solenoid locks up the rockers/lifters in the valvetrain. our cars do it gradually vtec does it all at once hence vtec kicking in. in a race the revs would be up high enough that vtec would be kicked in all the time though so the whole kicking in thing in videos is just a way to hide the horrible power curve that only exists at the very top end or that the guy is using nitrous.

Interestingly enough though some of the vtec systems like that used on the D16z6 civic si engine (before the b16/b18) actually increased the lift on only one intake valve using the difference in pressure to generate swirl in the cylinder during the intake stroke. Also hondas next generation of vtec is going to be able to provide throttleable valve just like our vvel system does only it retains a camshaft so performance modifications could still be made and the head won't be deemed non servicable upon failure. VVEL is already becoming out dated, although i'm not sure if the honda system has released the redline for the new valvetrain although i fear it will still be able to reach 9000rpm.

kannibul · 04-26-2010, 07:54 AM

Quote:

Originally Posted by 1slow370

yeah vtec is just a simple bitch version of VVEL in that it just increases the lift and duration of the camshaft above a certain rpm when an oil activated solenoid locks up the rockers/lifters in the valvetrain. our cars do it gradually vtec does it all at once hence vtec kicking in. in a race the revs would be up high enough that vtec would be kicked in all the time though so the whole kicking in thing in videos is just a way to hide the horrible power curve that only exists at the very top end or that the guy is using nitrous.

Interestingly enough though some of the vtec systems like that used on the D16z6 civic si engine (before the b16/b18) actually increased the lift on only one intake valve using the difference in pressure to generate swirl in the cylinder during the intake stroke. Also hondas next generation of vtec is going to be able to provide throttleable valve just like our vvel system does only it retains a camshaft so performance modifications could still be made and the head won't be deemed non servicable upon failure. VVEL is already becoming out dated, although i'm not sure if the honda system has released the redline for the new valvetrain although i fear it will still be able to reach 9000rpm.

I doubt Honda will make a V-6 using VTEC-II, so, no real worries.

Vegitto-kun · 04-26-2010, 08:27 AM

didn't know that.

probably has to do with me not giving a **** about cars 2 years ago

370Zsteve · 04-27-2010, 12:41 PM

Quote:

Originally Posted by 1slow370

yeah vtec is just a simple bitch version of VVEL in that it just increases the lift and duration of the camshaft above a certain rpm when an oil activated solenoid locks up the rockers/lifters in the valvetrain.

Honda had the misfortune of incorporating VTEC into the design of the VFR bikes at one point. One of their worst mistakes, ever. Almost killed the Interceptor line and was quickly removed.

Vegitto-kun · 04-28-2010, 06:17 AM

VTEC sounds awesome

I love the videos where the drivers go all "oh JESUS" when VTEC kicks in

fullmonty · 04-28-2010, 07:04 AM

Quote:

Originally Posted by Vegitto-kun

VTEC sounds awesome

I love the videos where the drivers go all "oh JESUS" when VTEC kicks in

When VTEC kicks in I can barley keep my car on the road. Feeling all those 145 ponies under neath the hood is almost to much for me to handle

Vegitto-kun · 04-28-2010, 08:06 AM

Like this guy?

04-26-2010, 03:51 AM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7252	yeah vtec is just a simple bitch version of VVEL in that it just increases the lift and duration of the camshaft above a certain rpm when an oil activated solenoid locks up the rockers/lifters in the valvetrain. our cars do it gradually vtec does it all at once hence vtec kicking in. in a race the revs would be up high enough that vtec would be kicked in all the time though so the whole kicking in thing in videos is just a way to hide the horrible power curve that only exists at the very top end or that the guy is using nitrous. Interestingly enough though some of the vtec systems like that used on the D16z6 civic si engine (before the b16/b18) actually increased the lift on only one intake valve using the difference in pressure to generate swirl in the cylinder during the intake stroke. Also hondas next generation of vtec is going to be able to provide throttleable valve just like our vvel system does only it retains a camshaft so performance modifications could still be made and the head won't be deemed non servicable upon failure. VVEL is already becoming out dated, although i'm not sure if the honda system has released the redline for the new valvetrain although i fear it will still be able to reach 9000rpm. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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04-26-2010, 08:27 AM	#3 (permalink)
Vegitto-kun A True Z Fanatic Join Date: Feb 2010 Location: USA Posts: 2,011 Drives: 09 370Z Rep Power: 264	didn't know that. probably has to do with me not giving a **** about cars 2 years ago

04-28-2010, 06:17 AM	#5 (permalink)
Vegitto-kun A True Z Fanatic Join Date: Feb 2010 Location: USA Posts: 2,011 Drives: 09 370Z Rep Power: 264	VTEC sounds awesome I love the videos where the drivers go all "oh JESUS" when VTEC kicks in

04-28-2010, 08:06 AM	#7 (permalink)
Vegitto-kun A True Z Fanatic Join Date: Feb 2010 Location: USA Posts: 2,011 Drives: 09 370Z Rep Power: 264	Like this guy?