Can you hear the Mivec Switchover?
#91
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you guys are forgetting that we have 2.4L engine, thats why we have so much Tq, not because of mivec of vtec, or anything, hehe
and I dont know, but I still insist that Ralliarts kick in at 4,500 and wont change my mind till some one proves im wrong with some kind of test or something
because If that noise is not mivec (im pretty sure it is) , then what is it???
and I dont know, but I still insist that Ralliarts kick in at 4,500 and wont change my mind till some one proves im wrong with some kind of test or something
because If that noise is not mivec (im pretty sure it is) , then what is it???
You don't have to believe me. It won't change the way your car operates either way. the mivec will kick in wherever it's going to, regardless of what you or I say.
It's controlled by oil pressure. RPM dictates oil pressure. If you were running out of oil your oil pressure would suffer, maybe you should check your oil?
#92
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the sound change at or around 4000 (depending on mods) is because the power output of the engine is so much greater than it is below 4000. the mivec switchover is at a point in the RPM range where the torque curve from the lower lift cams drops off and the one from the higher lift cams pick up. That is probably why it is smoother than vtec. Mitsu put the switchover at the "optimum" point, not the "biggest power gain" point, which is another reason why the engine tone doesn't change precisely at the switchover.
the tune I run on my car, combined with my SRI, creates a sucking sound that goes completely away at 3500 RPM and doesn't audibly return until over 4500 or so. It turns into a roar at 3500 RPM and drowns out the sucking sound altogether. This is where the engine really starts sucking air in, hence the roar from the engine. the increase in airflow as the engine revs higher lets the sucking sound get loud enough to be heard over the engine, so it's there the whole time.
If I were you, and my car pulled real hard at 4500 RPM's, I would see about some tuning. unless you are turbo you shouldn't have that much lag; especially after about 3000 to 3300 RPMs, and should have a pretty much constant pull after 4000 or so.
the tune I run on my car, combined with my SRI, creates a sucking sound that goes completely away at 3500 RPM and doesn't audibly return until over 4500 or so. It turns into a roar at 3500 RPM and drowns out the sucking sound altogether. This is where the engine really starts sucking air in, hence the roar from the engine. the increase in airflow as the engine revs higher lets the sucking sound get loud enough to be heard over the engine, so it's there the whole time.
If I were you, and my car pulled real hard at 4500 RPM's, I would see about some tuning. unless you are turbo you shouldn't have that much lag; especially after about 3000 to 3300 RPMs, and should have a pretty much constant pull after 4000 or so.
#94
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Well my car has been tuned, and I pull quite well at 4000 rpm. According to my dyno chart 3500-4500rpm is when the torque kicks in most and the rest of the curves are smoothed out.
#96
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the sound change at or around 4000 (depending on mods) is because the power output of the engine is so much greater than it is below 4000. the mivec switchover is at a point in the RPM range where the torque curve from the lower lift cams drops off and the one from the higher lift cams pick up. That is probably why it is smoother than vtec. Mitsu put the switchover at the "optimum" point, not the "biggest power gain" point, which is another reason why the engine tone doesn't change precisely at the switchover.
the tune I run on my car, combined with my SRI, creates a sucking sound that goes completely away at 3500 RPM and doesn't audibly return until over 4500 or so. It turns into a roar at 3500 RPM and drowns out the sucking sound altogether. This is where the engine really starts sucking air in, hence the roar from the engine. the increase in airflow as the engine revs higher lets the sucking sound get loud enough to be heard over the engine, so it's there the whole time.
If I were you, and my car pulled real hard at 4500 RPM's, I would see about some tuning. unless you are turbo you shouldn't have that much lag; especially after about 3000 to 3300 RPMs, and should have a pretty much constant pull after 4000 or so.
the tune I run on my car, combined with my SRI, creates a sucking sound that goes completely away at 3500 RPM and doesn't audibly return until over 4500 or so. It turns into a roar at 3500 RPM and drowns out the sucking sound altogether. This is where the engine really starts sucking air in, hence the roar from the engine. the increase in airflow as the engine revs higher lets the sucking sound get loud enough to be heard over the engine, so it's there the whole time.
If I were you, and my car pulled real hard at 4500 RPM's, I would see about some tuning. unless you are turbo you shouldn't have that much lag; especially after about 3000 to 3300 RPMs, and should have a pretty much constant pull after 4000 or so.
yeah i have the same thing with mine. the SRI stops around 3500 and picks up around 4000+/- for me as well. the lower rev range sounds like i have a window barely cracked though
#98
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I think with tuning mivec is "drowned out" or blended of some sort.
I went yesterday for a spin and 3500rpm, there isn't an 'obvious' changeover, just a little louder roar from the engine, sucking of the CAI and then 4000-45000rpm, it picks up!
I went yesterday for a spin and 3500rpm, there isn't an 'obvious' changeover, just a little louder roar from the engine, sucking of the CAI and then 4000-45000rpm, it picks up!
#99
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Correct me if I'm wrong, but isn't the MIVEC system used on the Evolution different than that used on the 4G Eclipse? Basicly, I thought MIVEC on an Evolution was simply a module on the intake cam gear, which advances timing based on different values sent by the ECU. Whereas, the MIVEC used on new Galants/Eclipses ect use a system similar to what Honda employs on it's VTEC setup, which is basicly and extra lobe on the cams which engage based upon throttle position/RPM.
If thats the case, how the **** do you "hear" your MIVEC come on on your Evo? Isnt that basicly like saying "I hear my timing advancing?"
If thats the case, how the **** do you "hear" your MIVEC come on on your Evo? Isnt that basicly like saying "I hear my timing advancing?"
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#101
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Well I dont know, I will put a led on the Mivec signal cable (if someone knows what color or anything, I dont have time even to open the hood for now) But i will put the stupid led to finaly see where is the ECU activating the mivec (at least on my car)
I dont know about you, but what I hear on my car, I bet everything I have it is the mivec, because it isnt a difference in sound, of a gradually change in sound or gradually pull, NO, it is a total change in sound in less than 0050 RPM (no matter what intake I have),
Another thing is that I have the stock exhaust (just the Injen CAI), maybe some of you guys cant hear it cause the exhaust sound is too loud (on modified ex)
BTW: Yes I know my Ralliart is not a HONDA, But my Civic h22, and my civic d16, and my friends Hondas (b16,b18, etc) the VTEC change over, its like what my Ralliart is doing
BUT WHO KNOWS
I dont know about you, but what I hear on my car, I bet everything I have it is the mivec, because it isnt a difference in sound, of a gradually change in sound or gradually pull, NO, it is a total change in sound in less than 0050 RPM (no matter what intake I have),
Another thing is that I have the stock exhaust (just the Injen CAI), maybe some of you guys cant hear it cause the exhaust sound is too loud (on modified ex)
BTW: Yes I know my Ralliart is not a HONDA, But my Civic h22, and my civic d16, and my friends Hondas (b16,b18, etc) the VTEC change over, its like what my Ralliart is doing
BUT WHO KNOWS
#102
Not to mention
If you read your owners manual it states that mivec will not engage unless motor is at normal running temp. Not sure why or why not but it states this in black and white in the owners manual. So if ur testing for performance or just to see when its kicking in make sure u have driven around for a few to warm the motor up properly. Mine seem to kickn in around 3500 but were are u guys dropping off?4800 -5200 rpm?
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#103
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Well I dont know, I will put a led on the Mivec signal cable (if someone knows what color or anything, I dont have time even to open the hood for now) But i will put the stupid led to finaly see where is the ECU activating the mivec (at least on my car)
I dont know about you, but what I hear on my car, I bet everything I have it is the mivec, because it isnt a difference in sound, of a gradually change in sound or gradually pull, NO, it is a total change in sound in less than 0050 RPM (no matter what intake I have),
I dont know about you, but what I hear on my car, I bet everything I have it is the mivec, because it isnt a difference in sound, of a gradually change in sound or gradually pull, NO, it is a total change in sound in less than 0050 RPM (no matter what intake I have),
mitsu knows
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engine sound≠mivec=oil pressure
Last edited by DangerousDan; Mar 31, 2007 at 08:41 AM.
#104
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If you read your owners manual it states that mivec will not engage unless motor is at normal running temp. Not sure why or why not but it states this in black and white in the owners manual. So if ur testing for performance or just to see when its kicking in make sure u have driven around for a few to warm the motor up properly. Mine seem to kickn in around 3500 but were are u guys dropping off?4800 -5200 rpm?
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