eh, whatever. if you want to agree to disagree, that's your perogative.

To be completely honest with you, if I could get a set of MIVEC heads, with cams the way I wanted them, and be in full control of them, I'd switch my car over. It would be sweet to have a great idle, and great economy with and a nice set of race cams all in the same package.

But, I can't. and it would suck to try and tune.

question .. the difference between the 6G75's in the galant and endeavor and the 6G75 in the 06 eclipse is only MIVEC right ? ... if so would it be possible to tune say the AWD 6G75 from the Endeavor to perform like if not better then the 6G75 in the eclipse with MIVEC ... ? ? ? enlighten me

I have no idea if the only difference between the two engines is MIVEC.

Depends what you mean by perform. If you mean have a better "all around torque curve, get better low rpm cruising gas milage, all while getting better emissions, probably not.

Given equal mods, the two engines should perform very similar in the upper RPM band if the only difference is MIVEC. (and the heads have very similar designs with the exception of MIVEC.)

Hi Mivec!

I got MIVEC in my car as well. Let me post my explanation, which I believe cool both of you down.

Variable Valve Timing (VVT) is implemented under many names, like MIVEC and VVTi and more are. But it is always the same principle and I don't think that Toyota makes its VVTi better than Mitsubishi does the MIVEC technology. Or that ECOTech is better than VTech. Nope.

Before VVT invented, engine designers has to decide, if they put "economy" camshaft in, or if they put there "racing" cam shaft. So the car was economy but lazy, or powerfull but thirsty. Or they did a compromise and decided to make some "in between solution", a compromise. Then the car was not so lazy, had some more power, but when driving slower, the emissions were higher. Simply, they could use only one camshaft profile.

After VVT intended, they could manufacture engine, which was running in economy mode when power was not needed (idling, low speed, low RPM). But the same engine could "switch" to a "sporty" profile when you put the pedal to the metal, so you get the power and do not care for emissions at that time. All this because you had another virtual sporty camshaft in on eengine. Simply, it is like the car would have two camshafts, one for ECO drive and one for POWER driving.

Of course, camshaft switched to "power profile" at high RPMs enable the engine to breath more air and more fuel, so it does produce more power than in ECO mode. But it is just the same power as you'd have the same engine without VVT and with "power profile camhaft" installed.

Definitely, the performance difference between Honda car with Vtech and Mitsubishi car with MIVEC is not caused by different VVT technology, but by other parameters. Be sure that you can modify the Vtech settings in Honda to make the car faster than yours (of course if these are comparable engines, not turbochrged 3.0 V6 against flat 1.6). But Honda engineers decided, that for this model the current default setting is optimal for all market needs. Not only for needs of racers :) Every single engine in street car is tuned to produce approx 60% to 80% of what its maximum is. Just to reach high durability...

The purpose of mivec, from mitsu is to be able to get good economy (gas milage+emissions) and good horse power from the same engine. So you have the lower cam profiles for everyday driving and then when you feel like it/ need the extra power it is there and it is all in one convienient little engine from the factory. If you are building a race motor or any other high performance engine it is more of a pain than advantage. There is no need for the "economy" lobe on the cam.

which is what I have been saying.... all along... I guess I'm confused why so many people need to say it... hopefully this one will die down now...

Yes, I allways agreed with your explanation. It is completely right. But probably too precise to be understood by Mivec. I just said that using other words. And Mrep_VB as well. So there is no need to be angry about 3 people argumenting with the same target. OKi?

oh no, I'm not angry. :thumbsup:

I just find it silly that so many people have to use so many different ways to explain the same thing, and people will still argue about how much horsepower it makes...

Here it is kindly...

Cold air intake... makes a whole lot of noise(SOunds freaking awesome... and it "Feels" faster. It is slightly faster but only because it breathes better. More air more power? I think? I Had injen... lots of noise no real increase in 1/4 time...

Oh to answer your question... it doesn't it just feel like it hits harder because it makes the sound... Kinda like when you hit boost in a turbo car.

I cant comment on the other upgrades because I didn't have an exhaust on my GSR.

I tend to stick with vtec being better because it has been around longer, the technology is more proven

more proven ... :clap:
not only v-tech is proven ...
even mitsui mivec is proven ....
its just a matter on how u bring it on ....
some ppl can make 4A 20v goes better than v-tech... u believe it...?
how fast n powerfull an engine not only depends on how much power u make ..
still lot of stuff u have to take into consideration ....
:P :P :P

CAI, Cat-back and....huge **** spoiler?

First of all congrats TTAngel, I joined the forum just to respond to this topic heh. But I've got a reply for ya! :) Gotta stick up for my MIVEC heh. First of all I'm going to agree with you on that a MIVEC or VVT does not enhance the power gained from bolt on parts. For all of you none believers, look at the Supra or Skyline. Not so sure they have VVT in em. However MIVEC and VVT does allow for individual tuning of the advancing and retarding of the cams at certains RPM's, which leads to higher torque and power.

On none variable valve timing cams, advancing or retarding the cam degrees affect all rpm ranges. This means that you can either increase max torque at the expense of HP or vice versa. In a VVT or MIVEC, because you can advance or retard the cam degrees for each RPM range individually using the ECU, you can actually achieve both higher torque and HP. Not only this, but if tuned correctly you can also achieve a broader torque and power curve (assuming the factory hasn't allready done this). Plus you can also tune for that fuel economy stuff... but who cares about that right? :thumbsup:

So, ok with the upper band. Neither Mivec nor Vtec improve horsepower. Understood, not to say well-known.

But at the low & mid range, doesn't a normal camshaft perform slightly better than an agressive one, which is designed to opperate best at high rpm? Excuse me if i'm wrong, but the way i see it, since a normal cam has smaller duration (or so i believe, please correct me if i'm wrong), it best fits the low range, where there's enough time for mixture intake, and should perform just slightly better power.

So, even though it is mainly an eco thing, maybe there's a bit more in it. I'm no specialist and i understand that in here there are many ones, so i wouldn't try to be a smartass. I'm looking forward for your explainations.

The cam has two profiles, one for idle and low rpms and one for high rpms.

It will not idle with the high rpm cam profile and you wouldn't be able to get as much power with the idle/low rpm profile

You didn't ask a question either.

Holy 2 year old thread batman

Sure, 2 year old thread, but since it's not deleted i guess i can post!

As for the question it is... just before the questionmark :)
Anyway, i think you didn't get it right. I asked if the normal profile of the camshaft performs better at low rpm than the agressive one does. Is this right?

No I got it right. Try again and read what I posted.




An aggressive cam angle will make more power but you will lose the idle.

read the how stuff works on vtec and stop complaining. there is never going to be a engine with VVT that is put in a car and can do a 9 second 1/4 mile. its just not going to happen.

v-tec, however, does offer better HP at higher RPM. and if either of you cannot accept this go eat a shotgun sandwich. your arguing over things that match up but bringing in factors that don't.

you can say whatever you want not every car is completely matched up. how come i was smoking eclipse GT's with a Oldsmobile Alero? sure i had .4 L on him, but his is supposed to be faster. they have more HP. Alero had only 170 HP
isn't the 3G eclipse GT supposed to be at like 200HP thats pretty pathetic when i have 30 less ponies and i tore his doors off.

here is some proof where there are other factors than just the motor. this this 1986 fiero GT has a 3.8L supercharged GTP motor in it with a 4 speed automatic with overdrive you heard correct automatic. high 12's with a motor that in the original car can only do 16.3.


http://www.truveo.com/Turbod-49-Fiero-Beck...T/id/1493338617

You didn't understand a thing about what I asked, cowboy. Not even close. And I've already read the relevents on wiki.