Explaining what VTEC really is to all you riceboys out there.

[Linux23]

so what type of variable valve technology does Nissan and Toyota use in their engines? which manufacturer has the best VVT tech?

 

[Thegonagle]

<< so what type of variable valve technology does Nissan and Toyota use in their engines? which manufacturer has the best VVT tech? >>


I still think it's Honda. It's such a simple design, yet it varies not only timing and lift, but duration of the valve opening. Like I've said before, having VTEC is like having two separate camshafts (regular and performance) in one. The new I-VTEC just combines another adaptation of VVT with their own VTEC, eliminating the major shortcoming of VTEC, which is that there are only two distinct stages. I-VTEC allows them to have two distinct ranges, one on each cam profile.

 

[dfi]

Very little ppl know this, but the effects of vtec stickers is exponential! One vtec sticker will give an additional 10 hp, but two vtec stickers will give 10^2 = 100 hp!!

Therefore, instead of one large sticker on the hood (which provides 1000 additional hp), you could simply put 3 vtec stickers on the hood to provide the same performance increase! To imagine your entire hood covered with vtec stickers. You could probably fit 40 stickers on there. 10^40 hp = chick magnet!

And dont forget the "powered by rice" sticker.

dfi

 

[gregshin]

Prelude can suck it....the only honda i give props to is S2000 or NSX....any others are beaters.

 

[Doggiedog]

Nice car.

I had a Prelude SH but became a family man so I had to give it up.

Still miss the handling on that car.

 

[AncientPC]

<< Prelude can suck it....the only honda i give props to is S2000 or NSX....any others are beaters. >>



Yes, everyone has the money to afford an S2000 or an NSX. Plus the fact that I'm getting my Prelude for dirt cheap.

 

[Linux23]

<<

<< so what type of variable valve technology does Nissan and Toyota use in their engines? which manufacturer has the best VVT tech? >>


I still think it's Honda. It's such a simple design, yet it varies not only timing and lift, but duration of the valve opening. Like I've said before, having VTEC is like having two separate camshafts (regular and performance) in one. The new I-VTEC just combines another adaptation of VVT with their own VTEC, eliminating the major shortcoming of VTEC, which is that there are only two distinct stages. I-VTEC allows them to have two distinct ranges, one on each cam profile. >>




i guess the distinct ranges comes from the shape of the cam lobe? I-VTEC is Honda right?

i heard that they were working on eliminating cams altogether and using some sort of electronic valve lifting technology? not sure if this is true or not.

 

[13thGuest]

It seems that these "high tech" engines are still pretty weak. I'd take a low tech 405 hp pushrod ls6 over a 120 hp high tech vtec anyday.

 

[erikistired]

can you explain the vr6 in my gti next? the sales guy tried to but i don't think he really knew that much about it.

thanks!

~erik

 

[Thegonagle]

<< i guess the distinct ranges comes from the shape of the cam lobe? I-VTEC is Honda right? >>


That's right and right.



<< i heard that they were working on eliminating cams altogether and using some sort of electronic valve lifting technology? not sure if this is true or not. >>


Also true. Several mfgrs. are trying to acheive this. Some have been working on it for decades. I'll bet we'll see it make Formula 1 and production soon enough.

 

[Thegonagle]

<< can you explain the vr6 in my gti next? the sales guy tried to but i don't think he really knew that much about it.

thanks!

~erik >>


The VR6 is essentially an inline 6 with the cylinders staggered slightly so that it is no longer (but slightly wider) than an inline 4.

 

[cressida]

hm.. Ut student

 

[erikistired]

<< The VR6 is essentially an inline 6 with the cylinders staggered slightly so that it is no longer (but slightly wider) than an inline 4. >>



yeah i got that much from the dealer. i was hoping it had magical powers like the vtec does. guess not.

~erik

 

[teg]

Prelude can suck it....the only honda i give props to is S2000 or NSX....any others are beaters.

I firmly disagree. I think the integra was Honda's best made car until they stopped making it (bad mistake, RSX is no integra)

I have a 90' integra and after 236km it still runs strong is one hell of a nice car.

Hondas are well built, refrined, fun to drive cars.

 

[Thegonagle]

<< yeah i got that much from the dealer. i was hoping it had magical powers like the vtec does. guess not.

~erik >>


The magic is that a 6 fits under the tiny hood of your car.

The design of the head with those staggered cylinders is a bit funky, so it's taken VW a very long time to finally come out with a 24 valve head for the VR6.

I would think that they should be able to put fit a fairly simple VVT system that acts on the cam pulleys, but I don't know if they could find room for any mechanism to change the amount of lift. Still, simple VVT is better than no VVT.

 

[Thegonagle]

<< <<Prelude can suck it....the only honda i give props to is S2000 or NSX....any others are beaters.>>

I firmly disagree. I think the integra was Honda's best made car until they stopped making it >>



Actually, i think it was the Prelude. It's always had a little bit more engine and cost a little bit more. I also liked driving them just a little more. They're just a little more refined, though the Integra is more practical (hatchback/better mileage).

 

[gregshin]

they BOTH suck

 

[MisterNi]

Ah, this thread reminds me of my old high school days.
Posers and their car talk, and slightly less posers and their car talk.

 

[AncientPC]

<< Actually, i think it was the Prelude. It's always had a little bit more engine and cost a little bit more. I also liked driving them just a little more. They're just a little more refined, though the Integra is more practical (hatchback/better mileage). >>



Which is quite sad since they're stopping production. The RSX is nowhere what the Integra and Prelude is, and probably never will be.

Ahh, yeah, sometimes when I'm squeezing 4 people in my car it's a hassle. But then again, since I'm the driver why should I care about leg room for them?

 

[DSTA]

Also true. Several mfgrs. are trying to acheive this. Some have been working on it for decades. I'll bet we'll see it make Formula 1 and production soon enough.

There's a rumour that the current Renault F1 engines finally run without camshaft. Dunno how they do it or if it's true of course, all top secret :-/.

What's being done for a long time is building race engines running without valve springs (valves close via pneumatics).

 

[zeon]

wow... imagine if all that pent up rage, fury and energy were directed into something useful... GET OVER YOURSELVES.... there just goddamn cars... you use them to get around... there not the end all and be all of your existence... don't let some fricking hunk of metal define you...

 

[SinNisTeR]

"cletus the slack jawed yokel"

hi.. the village lost its idiot or something?



dude.. losen up.. you might blow out a ring hole...

i'll take a subaru wrx sti that does 0-60 in under 5 secs.. and you can have your tank that does it in 7-8 and gets 8 miles to the gallon.

 

[Thegonagle]

<< wow... imagine if all that pent up rage, fury and energy were directed into something useful... GET OVER YOURSELVES.... there just goddamn cars... you use them to get around... there not the end all and be all of your existence... don't let some fricking hunk of metal define you... >>


You're right. I drive an old car (2 right now, actually) and I don't care what others think. I've bought myself "nice" cars in the past, but overall they didn't do anything for me. They're less fun because you need to worry about them, scratching them, and being upside-down on a loan. I can drive the freaking holy hell out of my old cars and have a great time doing it and if it breaks, I'm out between $600 and $2000. Big whoop!

I love driving and I enjoy talking about cars and engines, but as far as personal transportation goes, a car is just a car. If a carefully chosen $2000 car gets me everywhere that a recklessly purchased $40,000 car would, I'm happy as a clam. Your comments fit much better in any of the many, many car threads that have degraded into arguments and flames. Let us have our conversations about engine technology and either read and learn, or stay out.

Yes everyone, please lighten up.

 

[AncientPC]

Precisely, but some people just enjoy taking care of their car more than others. Others prefer to spend their time on something else.

Also, any girls you attract because of your car are not even worth dating.

 

[Thegonagle]

<< Also, any girls you attract because of your car are not even worth dating. >>



You got that right.

PS, I like your Prelude. Have you had it dynoed after the CAI and headers compared to before? I've heard that a new cat-back doesn't do jack for a Honda (stock cat-back is nearly perfect as is), but with the headers and cat, you can see some gains.