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Rev Limiter Lower Than Set Point

 
Old 12-23-2018, 12:24 PM
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Default Rev Limiter Lower Than Set Point

Running an ms3x on my na6 jrsc miata. Rev limiter set at 7200, which can be seen below. Weird thing is that I hit the rev limiter at about 6400 rpm, indicated by both the tach and megasquirt. Launch control is turned off. Any ideas why it's so low?
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Old 12-23-2018, 12:34 PM
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Originally Posted by cyclopat View Post
Running an ms3x on my na6 jrsc miata. Rev limiter set at 7200, which can be seen below. Weird thing is that I hit the rev limiter at about 6400 rpm, indicated by both the tach and megasquirt. Launch control is turned off. Any ideas why it's so low?
Your coolant limit curve? Looks like you have a 6000rpm limit up to 200 degrees.
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Old 12-23-2018, 12:35 PM
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Ya, but clt limiter is turned off.
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Old 12-23-2018, 01:31 PM
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What’re your overboost settings?
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Old 12-23-2018, 01:49 PM
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Overboost set at 195 kpa, I only ever get to about 175 kpa. Also, I get more boost in the midrange than up top.
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Old 12-23-2018, 03:14 PM
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I'll never understand why people post a question like this without including the tune and a log of the issue.

It's almost like they want us to make wild guesses.
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Old 12-23-2018, 03:49 PM
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What’s your hysterisis on the overboost?
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Old 12-23-2018, 03:49 PM
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I like guessing, I’m always right cause there’s no tune to prove me wrong.
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Old 12-23-2018, 04:12 PM
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The problem is overboost and it's also not overboost.

It will continue to be both until we open the log and check on the cat.
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Old 12-23-2018, 04:45 PM
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Sorry guys. Log attached as well as tune if anyone is interested. Look at 77 and 125 seconds in the log, that's when I hit the limiter.
Attached Files
File Type: msl
2018-12-23_15.54.29.msl (2.44 MB, 6 views)
File Type: msq
CurrentTune.msq (285.0 KB, 9 views)
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Old 12-23-2018, 11:11 PM
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And now we can conclude schrodinger's cat is dead.


You're losing sync. Tune the potentiometers.
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Old 12-23-2018, 11:23 PM
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Which potentiometers are you referencing? Sorry, I'm not super familiar with the megasquirt hardware.
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Old 12-23-2018, 11:33 PM
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It's covered under the expander board section here. https://trubokitty.com/#/ms3xassembly

Who built it?
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Old 12-23-2018, 11:35 PM
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I'll read through that. It was built by Ohio ECU Solutions.
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Old 01-03-2019, 10:09 AM
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I finally have time to dig into this tonight. Out of curiosity, how do you know I am losing sync? Knowing what to look for would be helpful in getting it tuned in. Thanks.
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Old 01-17-2019, 05:56 PM
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Keep an eye on your "Lost Sync Counter" in Tuner Studio.
It tells you when you lose sync.

You can look at your high speed data loggers for your Cam and Crank signals too.
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Old 02-02-2019, 10:45 AM
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Thanks for the help guys. Got the potentiometers tuned and everything is ok now!
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