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"Vtec is performance"

i personally think it isn't. i always thought it was more like a fuel saving part of the engine to only maximize the engine at higher rpm instead of having the engine at max through the whole band.
correct me if i am wrong[IMG]i/expressions/face-icon-small-confused.gif[/IMG]

 
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thats how it is on our cars. dohc vtec is more for performance though

 
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You raise a good point about vtec being a fuel-saving part of the engine because i kind of agree it has that function in certain driving situations (none of which come to mind-if you can give one that would be great id). although, think about-racing-when you're at w.o. throttle and at the rpm when vtec is activated (around 4500 rpm although that has had its fair share of debates so for me that number isn't 100% for sure) and the intake valves open for a longer period of time which means more oxygen goes into the combustion chamber and the ecu will figure out the increased amount of fuel that the injectors will have to deliver in order to match the corresponding amount of oxygen and to prevent a lean mixture so our D17's can get their 4-stroke on. this scenario would contradict the fuel saving nature of vtec [IMG]i/expressions/face-icon-small-cool.gif[/IMG]

what do you think? give me your opinion and if i confused you take this to clear your mind [IMG]i/expressions/beer_yum.gif[/IMG]

 
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VTEC is both for performance and economically fuel efficient... check out some of Honda's cars (excluding the NSX) with the best VTEC blocks in a car. The ones I'm talking about are the Acura Integra Type R (197 HP) and the s2000 (240HP). For the gas mileage both cars do under the amount of horses the push out, it is amazing... especially the Integra Type R considering it does exactly the same amount of gas mileage as it's GS-R model that's equipped with 170 horses. You get performance and a fuel efficient car. Honda's engine technology rules.

"VTEC is more than performace."

 
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after rereading your comment id and also that of Diznavis I would have to agree with both of you because definitely for example the B16 motor has vtec working much more on the side of performance than for gas economy however (sadly) our motor's vtec is much more geared towards the fuel-saving side than on the performance side imo. However, the scenario i gave you would also apply to our sohc vtec which would still use up more gas and make vtec a non-fuelsaving part of the engine under those circumstances [IMG]i/expressions/face-icon-small-cool.gif[/IMG]

 
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but still, wouldn't the vtec be more of a fuel saving thing in all honda engines? since hinda could've made the exact engine without vtec and tune it the same way and probabaly have the same performance, or even more. like.. instead of having the vtec and non-vtec lube on the cam, just have the vtec lube on the came would leave the car in a constant vtec, thus out performance a car that has only vtec at higher bands?[IMG]i/expressions/face-icon-small-confused.gif[/IMG]

 
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I see what you are saying about eliminating the regular cam lobes and if honda made a motor with a camshaft that had only those vtec profile lobes then it would be a performance engine at all bands. With this point of view, I agree with you in that our vtec is more for fuel-saving because with what you said it seems that our vtec is there to kind of put a cap on the peformance potential and keep the power on reserve for only those higher rpm bands....i think that you will agree with what i just said id but i have to say that as far as the variable timing goes i am a bit shady on that because as of now I am still a little unclear about how "variable" the valves are in terms of each 4-stroke cycle (how long and how many times they open and close). also, i must say that I am still ignorant of numerous details involved in the vtec process that no doubt factor into our discussion. i don't know about you, but imo it seems like vtec is kind of half and half....[IMG]i/expressions/face-icon-small-cool.gif[/IMG]

what do you think?

 
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both, nough said.

 
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Vtec is geared more for performance that fuel efficency. It does give more power and it decreases fuel efficency. The problem with making the cam always in Vtec would be a probably a pretty bad sounding, feeling and running engine. If you've sat in a car with a cam designed for high RPM use it idles like a piece. And likewise a good cam in the lower RPM's stops breathing at high RPM. Honda designed Vtec to get the best of both worlds, kind of. They've tried to make these little engines have torque and the give the top end of the powerband the cam it needs to breath. It doesn't make any sense at all that vtec is there for economy.

 
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From my understanding, the vtec is to allow efficiency at low rpms and power at the high rpms. The whole point is to have the best of both worlds. Otherwise, you have to compromise one way or the other.

 
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Voice, u removed that pinstripe on the outside of the car? if so how did u do that? i hate that stripe down the side of my ride, on the EPB coupe its the dark yellow color or maybe its beige??? anyway its ugly as sin, if it was whiteor silver to match the outside color than maybe.....but good lord, if this is what u removed can ya lemme know how u did it?

PeArLhOnDa

 
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hair dryer, alcohol, some water, quickwax and a lot of patience

apply hair dryer at the spot you are ready to remove
slowly peel the stripes away, with the hair dryer a few inches ahead of where you are going
remove, rub the sticky stuff off with alcohol
spray the side of car down with mist of water
quick wax

 
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im gonna do this just real quick...whats the potential to really damage my car doin this Voice?

PeArLhOnDa

 
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i guess... the paint comming off? i didn't have any problems

 
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i forgot

whats quickwax? just regular wax?

PeArLhOnDa

 
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in the 2001 honda civic coupe brochure : "Honda's VTEC-E tehcnology is employed in the Civic HX and EX engines. VTEC-E improves low-rpm torque and high-rpm power for better driving performance performance

 
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be techniqually, why didn't they use vtec through all rpm, then we would get the hp and torque we need a lot sooner than 7k![IMG]i/expressions/face-icon-small-confused.gif[/IMG] i still think it's to save fuel, instead of "performance"

 
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VTEC in a 2k1 EX or any SOHC Economy Civic is meant for just that Economy.

However the VTEC in the B series or DOHC engines is meant to help for performance, and less on economy (even tho it helps). A dude in a Prelude who changed his VTEC switchover point with a VAFC netted a 33.7hp gain when VTEC kicked in (see here for proof of quote and dyno. ). Personally, my gas mileage in my Si is worse when I parade around in VTEC, running the engine all the way up to 7 or 8k rpm. For me in my Si, shifting before the VTEC switchover point helps with my gas mileage, in the 2k1, I just drive like a nut all the time [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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If VTEC was meant just for economy they wouldn't just have it on the "sportiest" model of civic....(EX/Si)
Think about it.

 
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if vtec was on all the time we would gain performance, but lose gas mileage. if vtec was off all the time, we would gain gas mileage from the vtec point and up, but lose performance. it engages at a higher rpm so you get the best of both worlds, better gas mileage at lower rpms and better performance at higher rpms