so my ix head is all built and just about done, ready to bolt it down and slap the cams in. my machinist and i are discussing removing the mivec. i talked to dan at ams and he said to do that i would have to just sell my head and build an evo 8 head. yeah, well too late for that considering i have 5 grand in my head so far without the cams. so this is what were thinking and i want some input from you 4g63 builders and professionals.

were thinking the head castings are the same on the 8's and 9's with the exception of the mivec system. so were comparing a few different options and not quite sure which if any will work. to have a evo ix head with no mivec will we:

slap evo 8 cams and gears and just block off the oil line that goes to the cam to control the cam angle

or

can i use evo 9 cams from kelford with mivec oil holes with evo 8 cam gears and again block off the mivec oil feed line?

could you guys just ponder this and give me some feedback on the possibilites and pros and cons and discuss the best way to go about this if its even possible.
i would like to do this and need the help of YOU! 4g63 pros

 

Why? MIVEC is a good thing. At the very least it's allowing you to spool your turbo quicker.

 

Sounds good in theory. Blocking oil,and VIII gears. I honestly don't see how the engine would know the difference

 

Double post

 

Out of curiosity, can you itemize where you spent 5k on your head?

I'm not an expert or anything but I'd take variable timing over fixed timing anyday.

 

$5,000 into a 9 head.. i hope your kidding.

 

No no, the head actually has a slot for cash moneyyyy. He said 5 grand IN his head, not into the head. You guys are all silly.

+2 on variable timing over fixed. quicker spool ftw

 

IT wont work unless you have an AEM or something. When there is no intake cam signal it defaults to a limp map that we have no control over. If this is related to the cam scare, that has been mostly resolved as I havent heard of any new issues in quite awhile. There are actually many advantages to using MIVEC even with the same cam profile. Here are two dyno sheets in particular. One is an VIII and one is a IX. Both have the same turbo and both were tuned by me. The VIII is actually also speed density and was taking a little more timing comparing the 2 maps.

Evo VIII-



Evo IX-



Both are at the same boost level as well, momentary spike to 27 and holding out the top what it manages after the spike. Here are their respective threads-

Evo IX
https://www.evolutionm.net/forums/ev...sh-racing.html

Evo VIII
https://www.evolutionm.net/forums/ev...road-race.html

 

stay with mivec i wish my 8 had it

 

Id keep the head

 

i have aem ems, painless harness, car is gutted, everything from scratch, everything standalone. i bought an entire cosworth valvetrain, cams, gears, and machine work = over 5k actually. that does include the machine and stuff to block off the oil lines for the mivec. and if you look at ANY 800hp or over evo, is it mivec?? and and 800 hp or over honda, is it vtec?? no. dan from ams said the highest evo hes had tuned with mivec was not even 700 hp with tons of parts and tons of boost.

i dont think i want some stupid computer playing around with the timing on a cosworth motor and ppg trans with a gt47r turbo, 8 1000cc injectors, c16 and 45+ lbs of boost, and meth and/or n20. NOT gonna happen. ditch the mivec crap.

now, in my aem i do have the option to tune the mivec, also i can turn the feature completely off, so ill turn it off and if these 8 cams fit in the 9 casting with 8 gears, ill turn it off in the ecu, block the oil lines off and bee on my way. this will probaly be the first ix head with 8 cams and gears, someone from buschur and dan from ams both said its impossible and to just build an 8 head and put it on my 9 block, not gonna happen, i WILL have the first 9 head with no mivec and 8 cams and 2 adjustable gears, not one, and hopefully make tons of power doing it :-) wish me luck! thanks for your input (some of ya's anyways)

 

I'm pretty sure you're not getting an off the shelf 8 cam to work in the 9 head due to the extra cam position sensor on the intake cam that the 8s don't have. You might be able to modify the 8 cam to work I guess. Plus 2 adjustable cam gears is pretty much the same as mivec and and an adjustable exhaust cam gear. You could just set the entire mivec map to whatever value correlates to what you would set your adjustable gear.

 

That's about all I can say to this entire statement.

 

Didn't Most wanted Run his car with MIVEC to a 9.05?? or something? Look i see what your trying to do here, but its like wiping before you poop, it just doesn't make sense.....

 

x2 on that