Oh wow! Very nice! Are these your own maps, or they JDM spec?

Anyone have a reasonable explanation of why the stock USDM tune is such crap?

 

Lots of speculation:https://www.evolutionm.net/forums/ev...-revisted.html

I love this thread. Mivec = win!

 

It is a 100% stock Evo 10, all the way down to the stock evo 10 filter. The only thing changed to the Ecu between the two overlays where the mivec maps.

I think most of it you already know about but send me an email!

See above, car was tuned, then the only thing changed in the ECU between the two pulls where the mivec maps. So "yes way" it was only the Mivec.

Want to hear something that will really blow your mind? The factory mivec overlay actually ran 1psi more boost with the same wastegate duty cycles in the low to midrange because of less aggressive mivec maps ran less cylinder pressure. Also, the factory mivec overlay also logged *less load* than the tuned mivec and also 1* more timing than the tuned mivec. (because of the less load)

Hoping soon. The "exhaustive" testing will also include changes to just intake mivec, then just exhaust mivec, and then everything inbetween.


Tuned mivec maps, much different than JDM maps. The JDM maps are very conservative as well.

 

Gonna need more info on this one..... how so?

 

Let me rephrase that. The JDM maps are "conservative as well".

The JDM intake is pretty good but the exhaust is still a bit conservative in spots. The exhaust actually lost power up top on a stock USDM evo 10 running 91 octane that I tried it on. I believe it has a bit too much retard up top.

JDM mivec:



USDM mivec:

 

Ok... I thought that the various geographical climates and fuel types had something to do with it. It also makes sense the need to keep EGT low in order to meet the ridiculously strict gov mandated cat life cycle (this may just be the biggest factor). Considering modern day computational power, and ECU should be programmed with sufficient logic that ensures you have the right tune for the conditions. I just realized I'm off topic. Sorry.


GST, will you ever be providing/selling these maps, or would we have to go to your shop for the tune?

 

Putting the info to good use !!

Guess then you don't need the FQ series maps then ??

 

Seems like we're all pretty much on the same boat when it comes to the JDM exhaust mivec. Decreasing the retard on the higher RPM seems to work well

 

So the usdm exhaust mivec is basically flat during a wot pull wheras the JDM map actually uses a bit of retard after 4500..Not to mention the USDM seems a bit lumpy on the intake side..Good stuff bryan.. I can't wait to really start playing with this stuff!!

 

Bryan, do you have any information on tuning the exhaust cam? I understand tuning the intake cam but the exhaust cam is new to me. Would you just retard it where you would advance the intake cam to great even greater cylinder pressures? I am sure there is an art to it but i am looking for general physics behind it.

 

Nice looking info

 

variable valve systems, have to have some advantage after all.
Not just being smooth at low rpm and being less restrictive at higher one.
Good job guys !

 

Don't forget about us! There are a few here that are patiently waiting for your "exhaustive" post on dual mivec tuning.

Just a friendly reminder.

 

+1 Mivec tuning discussions for the X seem to be non-existent.....

 

Tuners make a living off of this, I don't know if they would want to spill their knowledge which may end up causing potential customers to tune their own vehicles.