I think the physical part of MIVEC (actually witching the cam profile) is achieved using hydrolics... but the hydrolic system is in turn managed by an electronic system. Completely mecanical systems are getting very rare on modern cars.

So if you control the electronics box, you control MIVEC as well. I wonder if there's a seperate box for the MIVEC or if it's program is ebbeded in the ECU though? Since the MIVEC switching point is constant, no additionnal data (available to the ECU) should be needed for it to do it's job... so they probably built a box for it, that gets the RPM sensor's data and switches the MIVEC accordingly.

It's all speculation on my part though... Does anybody know any of this to be true or false?

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I wonder if a well placed resistor (on the wire carrying the RPM sensor signal to the MIVEC controller) would affect the switching point?


I know it's a bit low-tech... but sometimes the simplest of ideas turn out to be the best. The again, I can be so wrong it's not even funny!

Okay, it would still be funny but for other reasons...

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WoRkZ - How many MPG did you get?

from here

http://www.mitsubishi-fto.org/parts/...ics/mvc85x.htm

R Spec Mivec Controller (Type1) c/w Speed Limiter Canceller


PR_Mivec's already seen that, but I don't know if the rest of you have.

 

Completely true. There's an oil pressure sensor that tells the ECU when there's enough pressure to activate MIVEC, and a separate circuit for an oil control valve that actually activates it. All controlled by the ECU.

 

great that explains the plug...... maybe is an oil pressure sensor... or an oil valve... isnt wondering fun?

 

wont work trust me on that....

 

So really, the RPM is insignificant, it's all turned on/off by oil pressure? I mean, the sensor tells the ECU when there is the proper pressure and then the ECU does it. There is no RPM sensor or anything?

 

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No, no... what he actually means is that the MIVEC won't activate over 3500 RPM if the hydrolic pressure isn't right. It kinda makes sense... after all, what would happen if the cam profile got shifted only part way? Iiiish... So if the sensor reports to the ECU that there's a pressure problem on the MIVEC system, it won't engage. But if oil pressure = okay and RPM > 3500 RPM than MIVEC switches to performance profile.

Guys, I really hope all our communal guessing is right though... this is all just educated guesses with a dose of technical hints after all.


Hey PR_Mivec, so what's the deal with that controller? Why doesn't it work on the RA? And tuffguy, were does that come from anyway? Is it for the EVO IX???

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the brit said that the mivec used in the fto is "diferent" <----- whatever that means.... (fully electrical no oil involved is my guess)
and here in pr some a$sclown bought (wich cost a lot) the ftomivec controler and the wiring and setup does not match.... if it only was like a vtec controler "plug and play".... *sigh*

 

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So much for that option then...

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http://www.mitsubishi-fto.org/parts/...ics/mvc85x.htm

Other
http://www.fastjapcars.com/mod-ProdR...ntent-id-4.htm
http://www.priracing.co.uk/product.p...od=292&xSec=66
http://fto-tension.web.infoseek.co.j.../denshi-e.html

 

^^ those are in origin and functionality vtec controlers....

 

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Okay, so that would explain the fact that it does not even remotely work with our MIVEC system then. Yeah, Vtec cams profiles are operated by a small electric motor with a threaded gear if I remember correctly (which is sadly not 100% of the time ).

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vtec is oil pressure driven same as ours..

-joe

 

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It is?!? So wouldn't the same kind of controller work then??? Are the controller boxes for Vtec affecting something other than the switchover point?

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