Vtec?

  • Thread starter Thread starter Street Racer
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niky
I guess it's just me. That's probably why I can't get any tires to last longer than 30,000 miles.
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I wish my summer tires lasted that long, but kind of the price I pay for the performance they offer.
 
VTECH is amazing!!!!! the super high rpm's,the scream of the engine, and that noticeable transition of when it kicks in all make it fantastic technology that's a little old. :-(.
 
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Street Racer
LoL. Tires and what not. We done.
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You must be new around here :rolleyes:

Also, proper sentences don't hurt either.

tpark103
VTECH is amazing!!!!! the super high rpm's,the scream of the engine, and that noticeable transition of when it kicks in all make it fantastic technology that's a little old. :-(.
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The transition isn't really noticeable in modern cars because of better design considerations.

It is a very neat technology, but the modern turbo's being developed and used, especially in Germany, kind of make VTEC pointless. Rather, make only NA performance engines dated.
 
Azuremen
It is a very neat technology, but the modern turbo's being developed and used, especially in Germany, kind of make VTEC pointless. Rather, make only NA performance engines dated.
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Quite. With modern small turbos, clever software, sequential turbocharging etc you not only have zero lag compared to turbo'd cars of old, but even pretty good response. And engines which can still rev as a naturally-aspirated car might.

That said, some of the world's best engines are still naturally aspirated. Ferrari's V8 for example, or AMG's 6.2-litre V8. Or Chevy's V8. Come to think of it, most of the good ones are V8s...

Oh, and a good VTEC-equipped engine is still lots of fun. Even if they're slowly phasing the old-style ones out, there's a great used market full of cars with cracking engines.
 
Eric.
Horsepower can be increased by increasing airflow, and one way to increase airflow is to increase RPM.
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Whoa now, careful how you word things. Maybe it's not what you meant but airflow and RPMs don't quite follow a linear relation. At least not past a certain RPM. Also, what you definitely meant to say was torque can be increased by increasing airflow and more torque will calculate into more HP at that RPM. Anyone can rev an engine higher and get a higher HP number but it's not any good if it can't maintain a relatively steady torque curve which usually drops due to, simply put, airflow. Even when the engine is being revved higher. This is what defines a great, high revving, NA engine. At least a "performance NA engine."
 
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Here's where I love being a Nissan fan. We get the benefits of the VVL system without all the "VTECH YO!!" jokes. :p
 
And Mazda and Toyota have VVT. It's a shame they have such a "ricer" reputation, Honda engines. They're awesome engines. Imagine a B series in a Miata! would'ev been a much more exiting car.
 
Toyota has VVTL-i, but I don't think Mazda has anything similar. VVT doesn't count. :p

Edit: I wouldn't mind having a Corolla XRS...
 
Yeah I agree, Honda's VTEC and Toyota's VVTL-i are the only ones that change valve lift. The VVT in 01+ BPs and 20v 4AGs simply change intake cam timing.
 
Azuremen
Yes, thus the term "V-tec kicking in" which is when the cam profile changes.

A dyno chart showing a VTEC change over point

7815d1187963528-2007-si-stock-dyno-2007_honda_civic_si-dyno_chart.jpg
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At about 5800 rpm, is that dip from the vtec kicking in or....?
 
R1600Turbo
Edit: I wouldn't mind having a Corolla XRS...
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Good lord they are hard to find. My friend has been looking for one to replace his Eclipse (yeah, I know), they're almost always on the opposite side of the country. My only quibble is the X-brace that eliminates the fold-down rear seat, but, I suppose I could give up my dreams of putting a bike in there.

Oh the things I'd do to have the XRS powertrain inside my Celica...
 
YSSMAN
Good lord they are hard to find. My friend has been looking for one to replace his Eclipse (yeah, I know), they're almost always on the opposite side of the country. My only quibble is the X-brace that eliminates the fold-down rear seat, but, I suppose I could give up my dreams of putting a bike in there.

Oh the things I'd do to have the XRS powertrain inside my Celica...
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I just searched my local craiglist for one and the only cars that showed up were the 2009+ versions which are definitely not the same. What year Celica? The 05+ Celica GT-S uses the same engine as the XRS.
 
My car is as far from gas saving as it can get.
I get around 18 MPG

I imagine when I step on it, it drops to around 10.

damn VVTi
 
R1600Turbo
Toyota has VVTL-i, but I don't think Mazda has anything similar. VVT doesn't count. :p
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I thought Mazda did, hasn't it had something similar since the facelifted NB Miata? And it almost certainly does on the modern Skyactiv stuff.

Most manufacturers use something similar these days. It's so common they don't even bother labeling it anything most of the time.

The really clever stuff is from Fiat, where valve timing is electro-hydraulic and constantly variable depending on load, revs etc.
 
VANOS in BMW's is similar as well, though Valvetronic is needed as well for the full lift effect.

However, the big deal with VTEC for a long time was the change in the cam profile itself, rather than just timing, Toyota didn't have anything to properly compete with till VVTL-i, which was 2000 I think. In short, Honda beat everyone to the variable lift game by nearly a decade for production cars, though I certainly could be mistaken.
 
Not quite sure if they were the first, but they were responsible for popularizing the idea with the buying public.
 
R1600Turbo
What year Celica? The 05+ Celica GT-S uses the same engine as the XRS.
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A '98 ST204, the best-looking of the Celicas, IMO. Although both the Celica GT-S and Corolla XRS used versions of the 2ZZ, the XRS had it's tuning altered to produce more power at lower RPMs.

Rolling around with the Camry 5S-FE, yes, that would be a significant improvement.
 
homeforsummer
I thought Mazda did, hasn't it had something similar since the facelifted NB Miata? And it almost certainly does on the modern Skyactiv stuff.

Most manufacturers use something similar these days. It's so common they don't even bother labeling it anything most of the time.

The really clever stuff is from Fiat, where valve timing is electro-hydraulic and constantly variable depending on load, revs etc.
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You might be thinking of regular VVT (variable valve timing) which is not the same. A lot of cars have a VVT system now days to help with emissions, but the only one I know of that is selling cars with an actual valve lift system is Honda.
 
R1600Turbo
You might be thinking of regular VVT (variable valve timing) which is not the same. A lot of cars have a VVT system now days to help with emissions, but the only one I know of that is selling cars with an actual valve lift system is Honda.
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Could be, yeah. Though the aforementioned Fiat system does lift too, as far as I'm aware.

There's probably a list somewhere with a comparison of what every maker's VVT systems are like and how they work...
 
R1600Turbo
You might be thinking of regular VVT (variable valve timing) which is not the same. A lot of cars have a VVT system now days to help with emissions, but the only one I know of that is selling cars with an actual valve lift system is Honda.
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VVTL-i has variable lift and a cam change over like VTEC, and the Valvetronic system I linked for BMW also does this. I believe Nissan's VVEL does this, VarioCam for Porsche, and I think MIVAC for Mitsubishi.

Honda beat everyone to the game, but that was in 1989. Everyone has caught up at this point.
 

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