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Old 07-28-2010, 10:25 PM   #1
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Default CLT & TPS noise

So I have been experiencing some of the random RPM spike issues that have been seen by others. I have been researching and getting ready to do the Abe NB mod. Due to this thread:
https://www.miataturbo.net/megasquirt-18/misfiring-while-cruising-seems-get-worse-when-hot-46772/

I looked back at my log and found A LOT of noise in my CLT and TPS. I believe this is related. What is causing this noise and how can I fix it?

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Old 07-29-2010, 01:51 AM   #2
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Try the cap on the boot jumper on the mail board mod. I helped me a lot.

-Raj
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Old 07-29-2010, 07:11 AM   #3
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Yeah I would like specifics on that mod. I have MS1 and looking thru the info it seems like this is a MS2 fix. Does it install on the daughter board?
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Old 07-29-2010, 08:19 AM   #4
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You know I was thinking thismorning. ... All 3 of t he signals I have noise on are the ones i am sharing with the stock ecu
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Old 07-29-2010, 09:23 AM   #5
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...which all share the same ground.
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Old 07-29-2010, 09:26 AM   #6
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Bingo! My iat has no noise but it is grounded locally I think

Solutions????
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Old 07-29-2010, 07:43 PM   #7
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The cap is supposed to go across the boot jumper on the main board. I don't know if it will work for MS1.
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Old 07-29-2010, 07:49 PM   #8
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What size?
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Old 07-29-2010, 07:52 PM   #9
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try a .1uF, .22uF or .33uF
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Old 07-29-2010, 07:55 PM   #10
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I'll give it a shot. How does putting a cap across the boot jumper help clean the signal? Won't that essentially short it out?
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Old 07-29-2010, 07:58 PM   #11
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I put a .22uF. I also have a .22uF and a 3300uF across the 12V coming in.
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Old 07-29-2010, 09:30 PM   #12
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Quote:
Originally Posted by 240_to_miata View Post
I'll give it a shot. How does putting a cap across the boot jumper help clean the signal? Won't that essentially short it out?

electronics run on magic.
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Old 07-29-2010, 09:38 PM   #13
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Good enough answer for me lol
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Old 07-30-2010, 12:46 AM   #14
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Quote:
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electronics run on magic.
I'm pretty sure they run on smoke.

Every time I let the smoke out of electronics they stop working.
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Old 07-30-2010, 10:28 AM   #15
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Try grounding the sensors to the MS instead of the stock ECU; what's the stock ECU need an accurate reading for?
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Old 07-30-2010, 10:32 AM   #16
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Haha. The grounds are currently all tied together in the harness. How should I separate them?
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Old 08-01-2010, 06:00 PM   #17
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AN UPDATE:

-I tried installing Abes NB input mod...it didnt work. I looked over my circuit and it looks fine. I went back to my original circuit and the car started right up.

- Separated stock and MS grounds. Made a better connection... ms has 6awg wire all the way back to the battery ground.

- Installed .22uf cap across boot jumper

I am bumed out the nb circuit didnt work. IDK why. It wouldn't crank, oem tach didn't work, ms tach showed about half of the actual value.

The CAP seemed to work... sorda. I took it for a 5 minute drive getting on boost and bringing it into high rpm. It didnt break up or anything, but the log shows there was still SOME noise. Should I try a different size cap?
-
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Old 08-01-2010, 06:17 PM   #18
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a larger 3300uF cap fro.m 12v to gnd might help too
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Old 08-01-2010, 06:24 PM   #19
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Pics please? I'm intrigued by this but I'm a visual learner.
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Old 08-01-2010, 06:26 PM   #20
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I'll post screen shots and pics later
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