Vtec sounds funny, what could it be?
#13
12-09-2011, 09:16 PM
yeah but when im in the cabin hen vtec engages it sounds raspy instead of loud, im not sure what the exhaust has to do with it? and im not sure what it sounds like outside of the car, i have an exhaust video if that helps Vibrant Axelback Exhaust: 1991 Honda Civic Si ED7 B16A - YouTube
#14
12-10-2011, 05:04 PM
Exhaust has a lot to do with it. I don't understand how you fail to comprehend this. vtec is allowing more air and gas to enter into the combustion chamber, creating a bigger bang. You hear this. Usually, the "noise" is slightly higher pitched (when in vtec), if you have a raspy exhaust, it is only going to sound raspier.
I hope you are not revving your motor up in the driveway or w/e expecting to hear vtec. Vtec will only engage if you are moving IIRC.
I hope you are not revving your motor up in the driveway or w/e expecting to hear vtec. Vtec will only engage if you are moving IIRC.
#16
12-10-2011, 08:08 PM
Yeah, generally you'll hear two things while an engine is running. You'll hear the intake sucking air (if it doesn't have a silencer/resonator, which most aftermarket intakes do not) and you'll hear the exhaust. If you listen closer you can hear lesser noises like the injectors clicking and the accessory drive pulleys, but that's about it. The most noticeable of these noises is obviously the exhaust.
Like I said earlier, vtec is simply a more aggressive camshaft profile; it allows more air into and out of the engine. The two biggest reasons vtec even exists are for fuel economy and power. Large/aggressive cams need a good amount of overlap for higher rpms (where they really shine), and that causes a loss in low-end torque as well as a rough idle (search for cammed mustangs, camaros, corvettes, etc. on youtube if you don't know what I'm talking about; there's plenty of videos of them). They also tend to need to use more fuel due to the whole "more air" thing. By having two or more profiles on the same camshaft (vtec) you get the best of both worlds, with a less aggressive profile for most driving situations and a slightly more aggressive profile for higher-rpm driving. Why does this matter? It goes back to the whole thing with more air into and out of the engine, particularly the "out of" part; your exhaust is going to be flowing a higher volume of air during vtec operation, so the exhaust will be louder and the tone will be amplified.
Hope that helps.
Like I said earlier, vtec is simply a more aggressive camshaft profile; it allows more air into and out of the engine. The two biggest reasons vtec even exists are for fuel economy and power. Large/aggressive cams need a good amount of overlap for higher rpms (where they really shine), and that causes a loss in low-end torque as well as a rough idle (search for cammed mustangs, camaros, corvettes, etc. on youtube if you don't know what I'm talking about; there's plenty of videos of them). They also tend to need to use more fuel due to the whole "more air" thing. By having two or more profiles on the same camshaft (vtec) you get the best of both worlds, with a less aggressive profile for most driving situations and a slightly more aggressive profile for higher-rpm driving. Why does this matter? It goes back to the whole thing with more air into and out of the engine, particularly the "out of" part; your exhaust is going to be flowing a higher volume of air during vtec operation, so the exhaust will be louder and the tone will be amplified.
Hope that helps.
#17
12-10-2011, 10:27 PM
Yeah, generally you'll hear two things while an engine is running. You'll hear the intake sucking air (if it doesn't have a silencer/resonator, which most aftermarket intakes do not) and you'll hear the exhaust. If you listen closer you can hear lesser noises like the injectors clicking and the accessory drive pulleys, but that's about it. The most noticeable of these noises is obviously the exhaust.
Like I said earlier, vtec is simply a more aggressive camshaft profile; it allows more air into and out of the engine. The two biggest reasons vtec even exists are for fuel economy and power. Large/aggressive cams need a good amount of overlap for higher rpms (where they really shine), and that causes a loss in low-end torque as well as a rough idle (search for cammed mustangs, camaros, corvettes, etc. on youtube if you don't know what I'm talking about; there's plenty of videos of them). They also tend to need to use more fuel due to the whole "more air" thing. By having two or more profiles on the same camshaft (vtec) you get the best of both worlds, with a less aggressive profile for most driving situations and a slightly more aggressive profile for higher-rpm driving. Why does this matter? It goes back to the whole thing with more air into and out of the engine, particularly the "out of" part; your exhaust is going to be flowing a higher volume of air during vtec operation, so the exhaust will be louder and the tone will be amplified.
Hope that helps.
Like I said earlier, vtec is simply a more aggressive camshaft profile; it allows more air into and out of the engine. The two biggest reasons vtec even exists are for fuel economy and power. Large/aggressive cams need a good amount of overlap for higher rpms (where they really shine), and that causes a loss in low-end torque as well as a rough idle (search for cammed mustangs, camaros, corvettes, etc. on youtube if you don't know what I'm talking about; there's plenty of videos of them). They also tend to need to use more fuel due to the whole "more air" thing. By having two or more profiles on the same camshaft (vtec) you get the best of both worlds, with a less aggressive profile for most driving situations and a slightly more aggressive profile for higher-rpm driving. Why does this matter? It goes back to the whole thing with more air into and out of the engine, particularly the "out of" part; your exhaust is going to be flowing a higher volume of air during vtec operation, so the exhaust will be louder and the tone will be amplified.
Hope that helps.
#18
12-11-2011, 05:23 PM
vtec sounds different depends on ur exhaust and intake setup... if you want it to be deep get a 3 inch short ram, with a good resonated piping and muffler.. shorter intake will crack vtec louder
heres an example of my cousin si we tested out with a 3 inch intake
http://www.youtube.com/watch?feature...&v=I11bjLZB4Gk
heres an example of my cousin si we tested out with a 3 inch intake
http://www.youtube.com/watch?feature...&v=I11bjLZB4Gk
#20
12-11-2011, 05:38 PM
ok i have a short ram with a knn filter, im sure that ill be fine ill switch my stock piping out, why are you spamming? my motor is out of a 1989 rsi integra not a b16a2 si
Last edited by theRDRman; 12-11-2011 at 05:43 PM.