cyclopat

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?

dleavitt

iTrader: (1)

Your coolant limit curve? Looks like you have a 6000rpm limit up to 200 degrees.

cyclopat

Ya, but clt limiter is turned off.

curly

iTrader: (25)

cyclopat

Overboost set at 195 kpa, I only ever get to about 175 kpa. Also, I get more boost in the midrange than up top.

SpartanSV

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.

curly

iTrader: (25)

curly

iTrader: (25)

SpartanSV

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.

cyclopat

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.

SpartanSV

And now we can conclude schrodinger's cat is dead.


You're losing sync. Tune the potentiometers.

cyclopat

Which potentiometers are you referencing? Sorry, I'm not super familiar with the megasquirt hardware.

SpartanSV

It's covered under the expander board section here. https://trubokitty.com/#/ms3xassembly

Who built it?

cyclopat

I'll read through that. It was built by Ohio ECU Solutions.

cyclopat

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.

venetox

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.

cyclopat

Thanks for the help guys. Got the potentiometers tuned and everything is ok now!