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Old 03-25-2008, 10:16 PM   #41
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Quote:
Originally Posted by Bryce View Post
I think you open a vex with megasquirt. It'll import only the timing table versus importing an entire .msq with all the settings that may not be right for you application.

I love you Mach929.
Oh ok. I'm @ work with no MS software on this computer.

Anyone post a screen shot of the table? I'm stuck here till 4am.
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Old 03-25-2008, 10:26 PM   #42
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mike add a .1uF cap on js8 and GND.

here was my timing table:



I've gone as high as this:

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Old 03-25-2008, 11:20 PM   #43
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"mike add a .1uF cap on js8 and GND"

Ok. Whats it going to solve?
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Old 03-25-2008, 11:27 PM   #44
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Originally Posted by IcantDo55 View Post
Its got a hickup at about 4500 rpm that we could not iron out, popular answer was that it was an ignition miss and would be solved by closing up spark plug gap or new coils. I'm open to ideas. The tach jumps when it happins.
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add a .1uF cap from js8 to ground. gap plugs at .30"


<-dyno plots that is.
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Whats the cap going to do?
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filter the tach signal a bit, it's all the rage.

anyone have any guesses?
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Old 03-25-2008, 11:50 PM   #45
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I have roughly that same issue but it's between 3500 and 4200 where I get rich spikes even though the fuel table is smooth...

I'll check spark gap first to see if that helps... but I get scared when you guys start getting all electrical on me. WTF does .1uF mean? I guess just tell me I can get one at Radio Shack.
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Old 03-26-2008, 12:14 AM   #46
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PLEASE LISTEN TO SCOTT and add the cap!!!!

It filters/smooths out the tach signal AND IT WILL WORK. It took the inventors of MS to figure this out (Per [email protected] Autotune).

BTDT...

Last pic in post 2 shows where and how.
https://www.miataturbo.net/forum/showthread.php?t=13676
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Old 03-26-2008, 12:17 AM   #47
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I have roughly that same issue but it's between 3500 and 4200 where I get rich spikes even though the fuel table is smooth...

I'll check spark gap first to see if that helps... but I get scared when you guys start getting all electrical on me. WTF does .1uF mean? I guess just tell me I can get one at Radio Shack.

yes you can. i just picked up a pack of 5 for like $2
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Old 03-26-2008, 12:19 AM   #48
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is this "adding a cap" thing also valid for mspnp models?
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Old 03-26-2008, 12:21 AM   #49
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yup,if not done by DIY already. my august version of the 94/95pnp didn't have it yet. i never had any hiccups but i added it when going to HiRes
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Old 03-26-2008, 12:23 AM   #50
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Originally Posted by Mach929 View Post
is this "adding a cap" thing also valid for mspnp models?

IIRC: You have have to check w/ DIY on that one, This hiccup didn't come to light til they were working on the 96/97 mspnp, I doubt earlier versions have it and it's not consistent between cars.
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Old 03-26-2008, 12:28 AM   #51
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Piece of cake *******... add this to my weekend list of Miata ****.

1. Pull Valve Cover.
2. JBWeld nuts for COP holdowns.
3. Clean, sand, paint Valve Cover.
4. Gap plugs
5. Add J8 resistor.
6. Install COP's, test (maybe adjust cranking pulse-width).
7. Clean intercooler and hit it with some flat black.
8. Fab up seatback mounting bracket for uber-seat (seat currently held in by twine).
9. Seriously consider new timing map.
10. Finally get down to LongShots and have a beer.
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Old 03-26-2008, 12:50 AM   #52
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Quote:
Originally Posted by samnavy View Post
Piece of cake *******... add this to my weekend list of Miata ****.

1. Pull Valve Cover.
2. JBWeld nuts for COP holdowns.
3. Clean, sand, paint Valve Cover.
4. Gap plugs
5. Add J8 resistor.
6. Install COP's, test (maybe adjust cranking pulse-width).
7. Clean intercooler and hit it with some flat black.
8. Fab up seatback mounting bracket for uber-seat (seat currently held in by twine).
9. Seriously consider new timing map.
10. Finally get down to LongShots and have a beer.
You forgot build DET can to help w/ your timing tune
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Old 03-26-2008, 09:36 AM   #53
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What's a DET can?

OH yah, and I need to do the research on a CATCH CAN since a "guy" I know swears I'm burning oil even though I'm not.
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Old 03-26-2008, 09:43 AM   #54
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Old 03-26-2008, 09:43 AM   #55
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Quote:
Originally Posted by samnavy View Post
5. Add J8 capacitor.
Fixed

Quote:
Originally Posted by Jefe View Post
IIRC: You have have to check w/ DIY on that one, This hiccup didn't come to light til they were working on the 96/97 mspnp, I doubt earlier versions have it and it's not consistent between cars.
My car needs it. Has a random misfire event that tends to occur when at high speed cruise (70-85mph). Some days, it won't happen. Other days, it'll do it 3-5 times. Hoping that this cap clears it up. As soon as I get my MB back (again) I'll be doing this.
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Old 03-26-2008, 10:16 AM   #56
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My 1990 suffered from this missfire as well so it's not just the later models. I fitted the thingy widget to my MSPNP and it cured it completely.
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Old 03-26-2008, 10:30 AM   #57
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I am so stoked to find out about this... I had no ******* clue what was causing this thing... just a random-no-reason rich spikes betweem 3500-4200rpm that nothing would fix. I'll be sure to post results.
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Old 03-26-2008, 10:33 AM   #58
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Sorry all. I know you told me of the cap before but when you said it would fix the "tach signal" I just thought it would solve the tach on the dash jumping at that RPM and I knew there was a seat of the pants miss too. So I though the dyno would show that it was a power loss problem not just a tach issue. Again sorry.

NOW BACK THE ORIGINAL PROBLEM!!!!

Where The F**CK is My 50 other horsepower????
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Old 03-26-2008, 11:02 AM   #59
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what was your AFR? your fuel map looks hella rich.

it's quite possible that the loaded dyno had heavy corrections on it....I betcha if you go back to the original dyno you'll have more power.
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Old 03-26-2008, 11:17 AM   #60
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I though AF looked good
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