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Old 11-05-2007, 11:36 AM   #1
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Its becoming more and more apparent that I will have to tune this car myself, because it seems that no one wants to do it because the last email I got from a tuner went like,
"Unfortunately, Megasquirt is one of
the systems that i do not tune. My job as the tuner is to make sure
the engine runs properly and from my past experiences with Megasquirt,
i was not able to make that happen as it should. It's frustrating
when the tool you're using to do your job does not do it's job as well
as it should."

So I think I need to buy a book and tune this thing myself. Any thoughts on what to read, or does anyone know of a good web page to teach me? I'd go to EFI 101 if I could afford it.
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Old 11-05-2007, 11:42 AM   #2
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drive to diyautotune. when I'm back in chicago I will grab my IC book. I would look for some engines book. Once you understand the process you can tune it safely.
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Old 11-05-2007, 11:43 AM   #3
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The megamanuals go into this a bit. Have you gone through the tuning section?
http://www.megamanual.com/v22manual/mtune.htm
There is always this too:
http://www.msextra.com/manuals/MS_Ex...nual_Index.htm
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Old 11-05-2007, 11:47 AM   #4
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The megamanuals go into this a bit. Have you gone through the tuning section?
Yes, I've read it several times. It provides instructions for tuning, not theory behind tuning. I'm sure there are "other unknown unknowns" I need to explore. I don't want to show up at the dyno and not know what to do. I need to know theory behind tuning, so I can tune this car once, safely.
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Old 11-05-2007, 11:49 AM   #5
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drive to diyautotune. when I'm back in chicago I will grab my IC book. I would look for some engines book. Once you understand the process you can tune it safely.
I've thought about this, but that's a really long drive...but I could stop at a few tracks along the way. I've also thought about hitting up BEGi because Stephany said they wanted to check out MS. However, I have to find a solid state / load bearing / eddy control dyno and that's tough to do. There's 1 local guy with one, but I don't know him, the shop, and how can I be sure he knows what he's doing?
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Old 11-05-2007, 11:51 AM   #6
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Here's a short read I had saved in my favorites.

http://www.innovatemotorsports.com/resources/rich.php
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Old 11-05-2007, 11:54 AM   #7
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Old 11-05-2007, 11:57 AM   #8
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Here's a short read I had saved in my favorites.

http://www.innovatemotorsports.com/resources/rich.php
Thanks. The local miata tuner seems to think a 10.5:1afr is reasonable, so I can't rely on him for further advice.
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Old 11-05-2007, 12:03 PM   #9
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Here's a short read I had saved in my favorites.

http://www.innovatemotorsports.com/resources/rich.php
Awesome. So it sounds to me like I should set my 100+kpa loads to run say 12.25 (split the difference) and then tune spark timing until it makes no more power on advance, or knocks. Right?

I think I'll be able to do most of my start, fuel, and enrichments on the street, then fine tune spark, make a dyno queen pass, then turn the boost down to 250whp-worth. I'm starting to think I can do this.
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Old 11-05-2007, 12:10 PM   #10
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if you can dick around with the tuning stuff on the street and get the hang of it, I'm sure if you found a steady state dyno you'd be able to fine tune it yourself to.
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Old 11-05-2007, 12:13 PM   #11
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I've been told to go to 14.0 at 100 kpa. Above that 12:1 just because fuel supposedly doesn't cool any better when richer than that. You'll have no problem tuning your enrichments on the street. You should have a fuel map close to what you will need to start tuning spark. Tune spark to where you make the most power in that cell. I've never done it though. I'd call jerry up i'm sure he'd talk you up about it. Or even an email so you have it in writing.
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Old 11-05-2007, 12:32 PM   #12
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Old 11-05-2007, 12:41 PM   #13
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Old 11-05-2007, 12:44 PM   #14
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Hustler it is not as hard as those tunners make it out to be. If i can do it then so can you. A competent codriver, can help a ton as well. GL
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Old 11-05-2007, 12:48 PM   #15
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lol
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Old 11-05-2007, 12:52 PM   #16
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That wasn't Written by Keith Tanner so it has no miata value come on man
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Old 11-05-2007, 12:54 PM   #17
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I don't get what was funny. If you are already beyond that books level I am sorry I suggested it.
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Old 11-05-2007, 01:16 PM   #18
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I don't get what was funny. If you are already beyond that books level I am sorry I suggested it.
Have you read it? I picked it up at the book store yesterday to check it out and its incredibly generic. Thanks for trying though.
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Old 11-05-2007, 01:17 PM   #19
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thanks for the info. I'm queer for every one of you.
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Old 11-05-2007, 01:23 PM   #20
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Have you read it? I picked it up at the book store yesterday to check it out and its incredibly generic. Thanks for trying though.
What exactly do you want? A manual for specifically tuning a Miata? Isn't generic what you are after, being that you want the theory behind tuning?

You aren't looking for being on the bleeding edge of things, sounds like you are more worried about being safe. Safe numbers should be pretty easy to arrive at at the cost of ultimate performance.

Maybe you should just ask your questions here, lots of good experience with <gasp> Miatas and the MegaSquirt. What is it that you want to know?
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