Thought for Today : Understanding VTEC

Strauss · Postby **Strauss** » December 17th, 2007, 10:49 am

Short easy version...

VTEC (Variable Timing and lift Electronic Control), allows the computer in Honda engines to change their cam profile - to change the timing depending on the RPM, correct?

So to build a good engine, at high rpm the intake valve opens in the late part of the exhaust stroke, correct? This is just common sense.

For for fuel economy, the brains at Honda decided to design an engine which is less aggressive at lower RPMs - which was their main goal. But at high rpm, when you Honda is doing well, it's actually driving 'NORMAL'

So now my conclusion and question for today:

Since at high rpm, your Honda is working how any car SUPPOSED to work, then when you are at low RPM and the car is driving slow and shytty, isn't that when you are really *in* VTEC?

:lol:

Comments?

Postby **Greypatch** » December 17th, 2007, 10:53 am

whyyyyyyyyyy :lol:

joker · Postby **joker** » December 17th, 2007, 10:56 am

[X]~Outlaw · Postby **[X]~Outlaw** » December 17th, 2007, 10:57 am

LMAO!!!!

this make my day :lol:

bushwakka · Postby **bushwakka** » December 17th, 2007, 10:57 am

uhhh....is that VTEC or econoTEC?

robbieg · Postby **robbieg** » December 17th, 2007, 11:04 am

VTEC FTW LOL :lol:

NOS4R2 · Postby **NOS4R2** » December 17th, 2007, 11:13 am

No Comments? :mrgreen:

noshownogo · Postby **noshownogo** » December 17th, 2007, 11:31 am

i am offended and must now crash trinituner with a virus of vtec proportions, wait then it wouldn't be that great anyways and may only harm this post. Ahh dammit, back to work for me :oops:

conswaylos · Postby **conswaylos** » December 17th, 2007, 11:36 am

TK! · Postby **TK!** » December 17th, 2007, 11:40 am

but stilll ... for every 1 ecu a toyota tuner can find ... honda tuners can find TEN!

aftermarket support just aint there for slowyotas!

Strauss · Postby **Strauss** » December 17th, 2007, 11:43 am

We don't need as much cr@p to get our Toyotas to go fast. We operate OUT OF VTEC.

If we have aftermarket ECU's it's a few and they are GREAT. With Honda, any primary school kid with some understanding of BASIC wants to design an ECU.

noshownogo · Postby **noshownogo** » December 17th, 2007, 11:46 am

strauss, where this hate for vtec come from? like you get beat up on from a hun-duh last night.

Strauss · Postby **Strauss** » December 17th, 2007, 11:48 am

No hate... just helping people understand exactly what is VTEC. :lol:

NOS4R2 · Postby **NOS4R2** » December 17th, 2007, 11:57 am

Strauss wrote:No hate... just helping people understand exactly what is VTEC.

Well Maybe a little :lol:

RBphoto · Postby **RBphoto** » December 17th, 2007, 12:14 pm

In defense of the Hun-duh crew (And this is a rear moment for me), doh hate the player, hate the game. If VTEC pullin panty, let the boys them play nah. Is the chupid airheads whose panties are so easily pulled by V-TEC stickers on anything, even a B11, that give this old technology fame. Not performance.

Cary on the panty pullin honduh boys :wink:

joker · Postby **joker** » December 17th, 2007, 12:15 pm

^^ first non racist comment from you

RBphoto · Postby **RBphoto** » December 17th, 2007, 12:19 pm

joker wrote:^^ first non racist comment from you

@ me? Find one racial comment I make, quote it here with full context and I will retire my profile and sign up as another profile.

ilovebeti · Postby **ilovebeti** » December 17th, 2007, 12:21 pm

bhagan wrote:In defense of the Hun-duh crew (And this is a rear moment for me), doh hate the player, hate the game. If VTEC pullin panty, let the boys them play nah. Is the chupid airheads whose panties are so easily pulled by V-TEC stickers on anything, even a B11, that give this old technology fame. Not performance.

Cary on the panty pullin honduh boys

talk bout missing the point

Strauss · Postby **Strauss** » December 17th, 2007, 12:28 pm

bhagan... read over my FIRST post carefully.

joker · Postby **joker** » December 17th, 2007, 12:30 pm

HARD LUCK DEY bhagan, TORT YUH WAS DAN YES :lol:

cacasplat3 · Postby **cacasplat3** » December 17th, 2007, 12:39 pm

Strauss wrote:Short easy version...

VTEC (Variable Timing and lift Electronic Control), allows the computer in Honda engines to change their cam profile - to change the timing depending on the RPM, correct?

So to build a good engine, at high rpm the intake valve opens in the late part of the exhaust stroke, correct? This is just common sense.

For for fuel economy, the brains at Honda decided to design an engine which is less aggressive at lower RPMs - which was their main goal. But at high rpm, when you Honda is doing well, it's actually driving 'NORMAL'

So now my conclusion and question for today:

Since at high rpm, your Honda is working how any car SUPPOSED to work, then when you are at low RPM and the car is driving slow and shytty, isn't that when you are really *in* VTEC?

Comments?

hahahahahaahHAHAHAHAHAHAHAAHAhahaah

X2 · Postby X2 » December 17th, 2007, 12:41 pm

Unless I'm missing something here...

Dr. Strauss... you failed the reading portion of the test.... but instead of sending ya to a website to read a 3 page link on how it works... I'll bottom line it.

Vtec is not solely based on ecu input, but also has 2 distinctly different cam profiles on the cam shaft (or both cams for DOHC engines). VTEC is based on Honda's F1 techonology, but was utilized in it's production cars with the goal of lower fuel consumption and emissions. The VTEC profile of the cam lobe is designed to allow the engine to operate at high rpm and make unheard of power for a small displacement engine. As an example, a stock B185 Integra Type R makes 108 hp per litre of displacement naturally aspirated in stock form, whereas a MKIV Toyota Supra makes 106 hp per litre and it needs a turbo to do it.

In reality, the VTEC cam profile is considerably more aggressive than a standard cam profile, but since it's SO aggressive AND designed for high rpm use (lots of overlap), running it at low rpm would result in crappy idle and bad low rpm torque.... so the Honda engineers added in a low rpm cam profile to allow good low end torque production (small overlap) and a smooth idle. Yep... VTEC is actually used to allow small engines to get great fuel economy AND good passing power.

In short Dr. Strauss... VTEC is so mad, super-fly crazy that Honda engineers had to put in lower profile cam lobes so that all the other small displacement engine manufacturers (like Toyota and Nissan ) wouldn't have their engines look like they were designed by a gang of knuckle dragging retards when compared to the Hondas.... well... at least until 6k rpm.

RBphoto · Postby **RBphoto** » December 17th, 2007, 12:50 pm

Strauss wrote:bhagan... read over my FIRST post carefully.

I know, I not talking about how you are explaining V-Tec, but why the Honda boys like it, toung in cheek style. Sorry for the off topic aight? Is ole talk forum, not tech you know.

Joker, get some glasses nah, bhagan look like dan? you get dislexic on the B and aint see D "hag"?

honda hoe · Postby **honda hoe** » December 17th, 2007, 12:55 pm

Strauss wrote:Short easy version...

VTEC (Variable Timing and lift Electronic Control), allows the computer in Honda engines to change their cam profile - to change the timing depending on the RPM, correct?

So to build a good engine, at high rpm the intake valve opens in the late part of the exhaust stroke, correct? This is just common sense.

For for fuel economy, the brains at Honda decided to design an engine which is less aggressive at lower RPMs - which was their main goal. But at high rpm, when you Honda is doing well, it's actually driving 'NORMAL'

So now my conclusion and question for today:

Since at high rpm, your Honda is working how any car SUPPOSED to work, then when you are at low RPM and the car is driving slow and shytty, isn't that when you are really *in* VTEC?

Comments?

SurGTR · Postby **SurGTR** » December 17th, 2007, 1:06 pm

well if Strauss thinks when the higher cams comes its now operating "normal" den you not shame a "normal" engine bussin so much ass and make it worse is a 1.6 or 1.5 :lol:

so you have atleast 0-6000 RMPS to beat the honda till "normal" operation and still cant catch up? tsk tsk

cacasplat3 · Postby **cacasplat3** » December 17th, 2007, 1:15 pm

but with all that it still going to run 14's FOREVER
:lol:

honda hoe · Postby **honda hoe** » December 17th, 2007, 1:16 pm

cacasplat3, wha bout boosted sr's dat STILL runnin 14's? :lol:

evo-STI-k · Postby **evo-STI-k** » December 17th, 2007, 1:18 pm

Strauss · Postby **Strauss** » December 17th, 2007, 1:23 pm

X2 wrote:In short Dr. Strauss... VTEC is so mad, super-fly crazy that Honda engineers had to put in lower profile cam lobes so that all the other small displacement engine manufacturers (like Toyota and Nissan ) wouldn't have their engines look like they were designed by a gang of knuckle dragging retards when compared to the Hondas.... well... at least until 6k rpm.

ROFL !!!!!

Then, Mr X2, you are implying that the WHOLE system is considered to be *in* VTEC.

But since Honda designed a "good" engine FIRST with an aggressive cam it was not called VTEC. But only when they added a low prof cam for low rpms, did they start calling the system VTEC.

You helped prove my point.

VTEC *is* mad super-fly crazy.... because it's so SLOW.