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Jan 14, 2009, 10:16 AM
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#16
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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?
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Jan 14, 2009, 10:22 AM
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#17
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NTEC Club Forum Leader
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Lots of speculation: OEM Tune Revisted
I love this thread. Mivec = win!
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mmmm corn
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Jan 14, 2009, 11:43 AM
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#18
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Quote:
Originally Posted by pltek
how about doing a test on a stock car (minus the intake) so that we can only see what Mivec can do, thanks
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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.
Quote:
Originally Posted by gunzo
How about spreading some love my way bryan ?? 
waiting for you to help me in the right direction ! 
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I think most of it you already know about but send me an email! 
Quote:
Originally Posted by keevo54
lol there is no way u gained that just from mivec tuning. maybe a stock tune vs a full tune with mivec maps
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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)
Quote:
Originally Posted by STi2EvoX
GST, when will the more "exhaustive test" be done? I am very curious as to the results of this. Great job so far man, keep it up.  |
Hoping soon. The "exhaustive" testing will also include changes to just intake mivec, then just exhaust mivec, and then everything inbetween.
Quote:
Originally Posted by madcows
Oh wow! Very nice! Are these your own maps, or they JDM spec?
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Tuned mivec maps, much different than JDM maps. The JDM maps are very conservative as well.
Last edited by GST Motorsports; Jan 14, 2009 at 11:49 AM.
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Jan 14, 2009, 11:47 AM
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#19
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Quote:
Originally Posted by GST Motorsports
The JDM maps are very conservative as well.
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Gonna need more info on this one..... how so?
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Jan 14, 2009, 12:02 PM
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#20
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Quote:
Originally Posted by Rguy
Gonna need more info on this one..... how so?
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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:
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Jan 14, 2009, 04:09 PM
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#21
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Quote:
Originally Posted by goofygrin
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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?
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Jan 14, 2009, 05:30 PM
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#22
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Quote:
Originally Posted by GST Motorsports
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. |
Putting the info to good use !!
Guess then you don't need the FQ series maps then ??
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Jan 14, 2009, 08:39 PM
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#23
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Quote:
Originally Posted by GST Motorsports
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. |
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
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Jan 14, 2009, 08:47 PM
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#24
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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!!
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Feb 9, 2009, 11:24 AM
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#25
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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.
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Feb 10, 2009, 12:24 AM
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#26
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Nice looking info
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Feb 10, 2009, 06:29 AM
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#27
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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 !
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Aug 18, 2009, 04:45 AM
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#28
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Quote:
Originally Posted by GST Motorsports
I plan in tweaking it a bit more before I post a more "exhaustive" look at Mivec tuning and it's benefits.
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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.
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Aug 18, 2009, 05:28 PM
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#29
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Quote:
Originally Posted by BigT
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.....
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Aug 18, 2009, 05:44 PM
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#30
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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.
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10, 160, 20, advantage, chip, closes, custom, evo, evolution, exhaust, intake, maps, mivec, tune, tuning, valve  |
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