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OK Im not a noob and I did serch for this, I couldnt find anything although it has been asked before. Why cant we here our VTEC kick in and is there anyhing we can do to make it louder? besides adding an intake?

 
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I don't think so man. I think it's mainly because we got the SOHC engine's. Our car's engine's are not built for power but more for fuel efficiency.

 
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It's probably 'cause the cam shaft doesn't have such an aggressive profile and also because we only have one of them. If we had two you'de probably get some more noise from the valve springs and valve rocker arms moving and what not. I bet that if we upgrade to the JUN camshaft or the GUDE camshaft when they're freely available, then we'll feel and hear the VTEC kick in much more than it used to.

 
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Low HP + Small grind + SOHC + ULEV = No VTEC feelings. Besides, VTEC isn't that hot, anymore. i-VTEC is nice, but I'll Yota's VVTI

 
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The only diference between the VTEC and the I-VTEC is the I stands for intelligent. That means a lot harder to mod.

 
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well. SOHC, single overhead camshaft, and we have the intake camshaft... so when the switch is engaged, into the aggressive mode, you only hear the intake... on DOHC engines, u hear the switch point of both the intake and the exhaust...

in either case, VTEC is implementation varies from car to car.. SOHC VTEC is only for mild power gains... if you want to hear those the infamous (and talked about too much) VTEC "noise" hop into a Si, GSR, Prelude, or S2000 and smile as the rpm reach way above our wimpy 7,000.

and I wouldn't say the new "i" in i-VTEC is the case for harder modification... its more of honda's approcah to cars that are more efficient... their focus is to make cars that emitts low emission, and pumps out great mileage... and oh yeah they're leaning to the safety ordeal too.... which, if you notice, these are the improvements of our generation over previous gen. lower emission, better mileage while still having more power (granted, not much more), and safer car (5 star rating all around on ex coupe with side airbag.) which, unfortunately, we can't have the best of both worlds.. well, not without selling out 2x, 3x amounts of dough anyway. heh.

 
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<< well. SOHC, single overhead camshaft, and we have the intake camshaft... so when the switch is engaged, into the aggressive mode, you only hear the intake... on DOHC engines, u hear the switch point of both the intake and the exhaust... >>



I'm pretty sure our cam shaft controls the intake valves and the exhaust valves. Otherwise, how would the exhaust valves open? The difference betwean the SOHC and the DOHC is that the SOHC has one camshaft which controls both the intake and the exhaust valve and with the DOHC you can control the intake valve timing and the exhaust valve timing independently. That way you can control the valve overlap which lets more fuel and air enter the combustion chamber. This overlap is optimized for a stock engine, but if you modify the engine you're going to want to change this overlap and with a DOHC it only takes two cam gears and a dyno. Our SOHC you can only control how soon the valve overlap happens or how late it happens, but it will always be the same. [IMG]i/expressions/face-icon-small-sad.gif[/IMG]

 
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the exhaust valves open using a system of levers and pullies invented by sir issac newton in 1902

 
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<< the exhaust valves open using a system of levers and pullies invented by sir issac newton in 1902 >>



[IMG]i/expressions/laugh2.gif[/IMG] Good one avenger!

 
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<< and I wouldn't say the new "i" in i-VTEC is the case for harder modification... its more of honda's approcah to cars that are more efficient... their focus is to make cars that emitts low emission, and pumps out great mileage... and oh yeah they're leaning to the safety ordeal too.... which, if you notice, these are the improvements of our generation over previous gen. lower emission, better mileage while still having more power (granted, not much more), and safer car (5 star rating all around on ex coupe with side airbag.) which, unfortunately, we can't have the best of both worlds.. well, not without selling out 2x, 3x amounts of dough anyway. heh. >>


Hmm... and I thought when my car hit the 4,100 RPM mark it was the engine making a different sound but just as my friends said... it was the intake. (Still sounds nice...) Yeah, I agree that the VTEC in our cars due to the engine being an SOHC can't really show what the VTEC can really muster out in terms of performance.

The i-VTEC along with Honda's new 1.7 liter engine for the Civic... it is of course a newer technology that over the years (I'm sure) Honda will build a lot more engines that are i-VTEC but used in different cars thus making the parts in those cars compatible with what we've got now... the 7th generation Civic, 3rd generation Integra (RSX), 1st generation s2000 and very soon then new Si which has yet to have surgery. As for the aftermarket support for these new engines, getting performance out these cars seems to be like starting from the very beginning from point a, to point b, to point c and so on. Our Civics are still at point a and I wish some people would be a bit more understanding about this when it comes to fixing up a new car... yeah, it's a new car but this is also a totally new generation. In the end for now, SOHC VTEC is just economically friendly. [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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Yah I have to agree that right around 4K rpms the sound is different and the engine begins to rev much faster. I bet with an aftermarket intake you could hear the change over a bit better.

 
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good point, now that you pointed it out and I thought about it, that doesn't make much sense, what I stated about the intake cam... hmm, wonder where I got that from. its stuck in my head somehow.

anyhow, my bad. I try my best not to spill info unless I think I'm right at least 80+ percent... so woopsy.

 
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yeah i notice that diffrence at 4k too. but once i add my CAI i think it will sound cleaner. but still if you want the true VTEC noise you shoulda invested in a S2000 [IMG]i/expressions/laugh2.gif[/IMG][IMG]i/expressions/laugh2.gif[/IMG][IMG]i/expressions/laugh2.gif[/IMG]

 
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i can hear intake valve #2 open at 2500rpm (civic ex)

 
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I was just wondering b/c my friend has a 97 civic ex and when his opens up its loud as hell ( We both have the same mods and I kick his *** though)

 
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<< Low HP + Small grind + SOHC + ULEV = No VTEC feelings. Besides, VTEC isn't that hot, anymore. i-VTEC is nice, but I'll Yota's VVTI >>



VVTI-L is nice but Toyota really screwed up with gearing(Celica GT-S).

 
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<< but still if you want the true VTEC noise you shoulda invested in a S2000 [IMG]i/expressions/laugh2.gif[/IMG][IMG]i/expressions/laugh2.gif[/IMG][IMG]i/expressions/laugh2.gif[/IMG] >>


Actually... I'm investing in this... then I'll be satisfied... for some time.