variable valve timing?

whysoSERious · 2008-10-09 05:52:53

I know Honda has VTEC, well i-VTEC now, and toyota has VVT-i, I'm not too sure what Nissan calls theirs. Anyways, I spent like 15 minutes listening to my friend talk and talk about his VTEC (he drives a 04 civic lx) and how it kicked in at 5500rpm. He was asking me when the (whatever nissans calls their shit) kicks in. I don't know the exact rpm, but i just replied with "I have no fucking idea, I just put my foot down and it takes off from whatever rpm I'm at all the way to redline." I am kinda curious though when the valve timing actually does kick in, if anyone knows.

saint0421 · 2008-10-09 06:31:24

It's continuous

Stitch · 2008-10-09 07:53:42

You're friends single cam VTEC doesn't engage at 5500rpms.

It engages only early on at about 2200rpms and it is STRICTLY for fuel economy only on that specfiic engine.

Tell him not to be a noob about it.

Our's is CVTC and it isn't NEARLY the same mechanism, Toyota's VVTL-I isn't even in production anymore and really is the only other system that manages lift in order to increase high rpm output. Hell they didn't even design it, Yamaha's outsourced 2ZZ-GE engine did, although it is a fantastic engine.

To answer your question though, (sorry for the rant) ours is continuously variable as in always changing depending on input and conditions.

Nismo062 · 2008-10-09 08:03:27

Stitch wrote:
You're friends single cam VTEC doesn't engage at 5500rpms.

It engages only early on at about 2200rpms and it is STRICTLY for fuel economy only on that specfiic engine.

Tell him not to be a noob about it.

Our's is CVTC and it isn't NEARLY the same mechanism, Toyota's VVTL-I isn't even in production anymore and really is the only other system that manages lift in order to increase high rpm output. Hell they didn't even design it, Yamaha's outsourced 2ZZ-GE engine did, although it is a fantastic engine.

To answer your question though, (sorry for the rant) ours is continuously variable as in always changing depending on input and conditions.

And that ended in 05 with the Celica GT-S

sporkhey · 2008-10-09 13:06:22

But you must admit when the Vtec kicks in it sounds badd ass. I rode in a 2001 Si or some year close (the hatch kind) And it sounded badd ass when it kicked in. It was on steriods too so that may have helped.

Stitch · 2008-10-09 20:57:04

uhh The 02-05 Civic Si (the hatchback kind as you call it) doesn't even have the real VTEC, it has the same engine the base RSX has, which doesn't have the performance VTEC, it only has the fuel efficiency VTEC, which means no, you don't crack VTEC and no it doesn't sound awesome.

Take a K20A2 and rip that up to 6k rpms (when fully warmed up of course) and you'll hear a beautiful noise, but not from the ep3.

Not hating bro, just trying to educate you on some things. You're facts are a tad bit mixed.

dirtyV · 2008-10-09 23:01:14

Stitch wrote:
uhh The 02-05 Civic Si (the hatchback kind as you call it) doesn't even have the real VTEC, it has the same engine the base RSX has, which doesn't have the performance VTEC, it only has the fuel efficiency VTEC, which means no, you don't crack VTEC and no it doesn't sound awesome.

Take a K20A2 and rip that up to 6k rpms (when fully warmed up of course) and you'll hear a beautiful noise, but not from the ep3.

Not hating bro, just trying to educate you on some things. You're facts are a tad bit mixed.

Race header/exhaust/intake @ vtec engagement to redline in the K20 is something to behold.

sw0ggd0gg · 2008-10-09 23:39:24

To clarify wha holmes was saying, there are two type of VTAK. One is Economy one is Performance. The one that make performance is on the exhaust side. Cam 'profile' will open more at certain RPM's with the classic VTAK! i had a EG hatch with a PnP b16 and once 5600 came around it sounded liek a fuckin V-Twin. I actaully woudl stomp the hell outta harleys and they ask me "You gotta V6?!" I was like 'no, a 1.6' but yeah the only kickass vtec are in the RSX S which is I-VTEC which generally has three on three profiles, one set at rpms, one set at throttle postion. and the b16a and h22's and so on. but yeah the si's the only one that had the good was the em1 99'00 si b16 and the new ones adn the type s'

sporkhey · 2008-10-10 05:43:29

Stitch wrote:
uhh The 02-05 Civic Si (the hatchback kind as you call it) doesn't even have the real VTEC, it has the same engine the base RSX has, which doesn't have the performance VTEC, it only has the fuel efficiency VTEC, which means no, you don't crack VTEC and no it doesn't sound awesome.

Take a K20A2 and rip that up to 6k rpms (when fully warmed up of course) and you'll hear a beautiful noise, but not from the ep3.

Not hating bro, just trying to educate you on some things. You're facts are a tad bit mixed.

Like i said the car was on steriods. The car had some motor from a type S something. (look i dont know honda at all so who cares) All i was saying is it sounds cool. Dont get your panties all twisted up. I think you take this site too serious, everytime i write something you seem to be right behind me saying im wrong about vtec or i have cheap HID's BE LOW ME!

Last edited by sporkhey (2008-10-10 08:49:10)

07BlackSpecV · 2008-10-10 08:31:22

I test drove a 2000 or 2001 Prelude SH a couple years ago. It had I do believe the H22 DOHC 16V engine,5 speed. My dad and I were playing in it and I decided I wanted to see what Vtec was. I hit around 5500rpm, the car took off, and dad started yelling at me not tho blow the engine. I told him to relax because that is what its supposed to do. The end of the story...very impressed by performance vtec (I dont make fun of it anymore).

Stitch · 2008-10-10 09:13:40

Yeah it's a trick Honda developed to make thier cars more fun to drive, and trust me it works.

They engineer a dip in power right before the crossover to make it more dramatic, in all reality, fleshing out the VTEC crossover yields better gains but you lose that kick that people are accustomed too.

Take a new K20z3 from a civic si, I/RH/E + hondata reflash, it will pull very nicely but you won't feel any VTEC crossover because the Reflash gives huge mid range gains for the honda because of factory detuning, the same applies for every DOHC VTEC engine.

I like Honda's I wish I got an ephatch and swapped an a2.

I/Rh/E K-pro and suspension = mid 13's @ 103-105mph all day long on street tires. and probably the same mileage I see in the spec. the ephatch is heavy though, but i <3 the interior.

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