Yeah I know what it means ... (vtech ) for mitsu.. So is this just controlled by the ECU? Main question is if you buy a EVO IX and then do a AEM does that mean you lose your MIVEC?

 

VTECH is a phone company. There are only a few people who understand MIVEC on this site, but from what I understand, the MIVEC on the Evo IX is only on the exhaust cam.

 

 

looks like the mivec is on the intake camshaft.

 

It has to do with the cams as well. Not just the ECU, so an AEM wouldn't get rid of it. They'll probably have to change standalones and such to work on the EVO IX with MIVEC. That and cam work still has a big "?" labeled on it about what will and won't work with the whole MIVEC thing.

 

Correct It shouldn't be too hard to tackle with an EMS (relatively speaking). Afterall, they do use them on VTEC-equipped cars...

 

I am also really currious about what can be achieved with (or by adding) mivec. Does anyone know if the mivec system is driven by the ECU, mechanically or most likely a combination?

 

so could this be added to a VIII? with IV parts ?????

 

One of the reasons I chose the Evo over the STI was the Evo's lack of variable valve timing. It becomes a b1tch to tune as the mods pile up (and they will).

Food for thought:

1. TurboXS, who were specializing in WRX performance, released the Evo UTEC before the STI one. Subaru's AVCS was a PITA.

2. S14 and S15 owners with serious power run the S13 head, which doesn't have NVCS and is therefore less complicated to tune compared to the NVCS-equipped SR20 motors.

 

With a MIVEC equiped 4g63, is the only thing that is mechanicaly added MIVEC cam gear?

 

Alex, I agree with your points, but I'm considering this more from the perspective of a "street friendly" car than an all out performance monster. Believe it or not, the "speed" lobes on a Honda VTEC set-up are alot more aggressive than almost anything you will find on a non-VTEC style engine; even the big lopy aftermarket cams. If a MIVEC conversion can allow us to run much more agressive cams and help keep low speed and part throttle driveability it could be a nice aid in building smooth, high HP cars.

Of course all this is just talk until we can play with the new toys.

 

honda Vtec has variable lift and timming, i think the MIVEC on evo's only have variable timming. i'm sure AEM will come out with a version of EMS that would be compatible with MIVEC if the curent version doesn't work already.

 

Tuning the car is not going to be a problem. The tuners always find a way.

my question is.....for the EVO IX and beyond...what kind of cam upgrades are there going to be? because of the mivec, HKS and all the other big cam companies are going to all have to come out with totally different sets of cams for the new EVO's...i'm sure they will do it...but it's going to suck for them and also for the people who buy the IX it's probably going to be a pretty long wait till anyone comes out with any good and proven cam combination.

 

MIVEC is activated by oil pressure and is based on RPM. It varies only intake valve timing.