Paramedic conniptoin? What does this effect? Only fueling? Or fuel and ignition?
 

I'm asking because 80kpa is what row I'm in when WOT. This places me in significantly higher numbers in the ignition advance table and fueling tables. Is there some altitude correction curve I can adjust for ignition and fueling?

I have found the Barometric Correction chart/graph... Now, I'm guessing this only effects fueling? The X axis is Barometric pressure, and the Y axis is Correction %

lets say I am driving at sea level, WOT is 100kpa. What is my correction % at sea level? The Y axis defaults at a minimum 80% and maximum 120% I'm guessing that correction is 100% at sea level?

At 6000ft wot is 80kpa, so I should be at a higher % or lower % correction?

I hope you don't start machine-gun spamming the whole forum with questions like this cause you'll need to create 1000000000,00000000000,0000000000 threads to even get to basic understanding of things.

Either start searching/reading the MS forums more, or create 1 big "marchello questions" thread and start there.

At sea level, with engine off, you're around 100kpa
Everything elser revolves around that number, because it reads your maps based on what baro setting you have relative to what the map sensor is reading.

Yeah I've been watching the trace of where the car is currently on a few of the tables.

I need to read up on a lot, but you did most of the ecu setup, I'm just interested in dialing in my fueling, timing, and vvt, which have been way off for a while now at altitude.

Of course, it's not a problem, but the proper way to learn is:

1) read about what it does and how adjustments affect it's operation
2) understand where it is, and where it needs to be, and the corrections you need to make
3) apply the above acquired knowledge saving a copy of current file prior to modification in case you mess up

This goes for all sorts of tuning, regardless of if car is set up or not.
Most people think it's magic, it's just tedious intake of information, digestion, and application along with basic mathematics and understanding of engine operation/requirements. 99.99% of the people are way too lazy to do it the right way, and just start pecking at the keyboard, or worse yet: copy/pasting other tables/maps/tunes, and hoping the car magically runs better. lol

That's like a doctor giving a patient a handful of random/different pills and hoping that they not only not die, but also get better

I fully agree.

I have only changed the vvt table, and fuel ve table and everything is under new file names. I just remember when we messed around with vvt, it didnt have any effect, thats why I was trying something different.

update vvt, and then run ve autotune. if it adds fuel, then you've made more power :)

Using ms3x, newest released firmware, 2 baro sensors with active correction on.
I travel from about 5300ft to 7300ft every time I drive my car (85-75kpa).
Oddly my baro correction table is all zero... and my afr's are fine...
I had anticipated that I would need some correction but found when messing with that table it added or pulled too much fuel with even small adjustments.
I can easily test to 10kft... maybe I should make a run and log the whole thing.

Let us know what you find on your end.

Depends on when your tune was.


https://cimg1.ibsrv.net/gimg/www.mia...00cbaa9ae5.pnga

I think I remember these oddities. I'm using the "new install" mode. Can't remember how I came to all zeroes...
YMMV... I'll update once they clean my road up from our recent snowstorm.

Take a log and look at it on MLV. Adjust fueling as necessary if you don't like your AFR's there.
Or use the Autotune feature on MLV to get in the ball park (get a big log) and then adjust manually as needed.

I cant do this yet, because the barro correction hasn't been set up. If I run autotune, it will try to hit the wrong cells of the afr and timing table.

I still am trying to figure out what % correction to put in the table.

its not correction. it's a value. I already told you, but you ignored it. re-read what I said in post 2:

at sea level, so 0 elevation, the engine off ignition on map reading should be 100kpa
so whatever elevation you're at, it's gonna be less
so then you turn on ignition but leave engine off, and see what the map sensor is reading at your elevation.
then you plug that into the engine constants under "barometric pressure default" or whatever it's called. so that it's not variable, but set. that's it.

when you called me months ago when you moved back, you said the car leaned out at elevation, I told you update the baro correction from 100 to I think 80 or 70. do you remember our conversation?
so then you told me it runs great. now you're saying car runs bad. I don't know what to think anymore, lol

why would you want the car to read at 100kpa when you're not at 100kpa?

you want the car to read the actual barometric pressure.
and I would personally not run any more than about 30* advance at wot on pump gas on a stock engine

Ok, I'll check that

I want it to be in the correct cells. Right now, in the timing table you set up (haven't changed that) wot at 7000 is 31.4 because its in the 80kpa row. That's what I don't like. It should be adjusting timing and fuel due to a different pressure.

Unless wot at 80kpa is like 80% throttle at sea level, in which case, I guess it doesnt matter. That's what I meant by my question in my first post.

you're completely mis-understanding how it works.

why would you not want it to read 80kpa when you are, in fact, at 80kpa barometric pressure?

Also, at 7k, even at seal level, your car wouldn't even hit 100kpa, it's outa breath. Go look at some logs of stock Miata's, you'll see MAP drop well below 100kpa at redline

*edit: here you go, this is your car when we tuned it

https://cimg6.ibsrv.net/gimg/www.mia...74f53dc272.png

Well it looks like my settings do something... I'll get a mountain run in soon to see what 10kft will do. There must be a linear equation built in that the correction table modifies.
It looks like 108.7% at 81.6kpa and 111% at 77kpa
EDIT: I should point out this is with 2 sensors installed
https://cimg1.ibsrv.net/gimg/www.mia...20a81a37cc.png

his Rev built MS3 could never get that to actually work right. ever

But there's no datalog to show what's wrong. And this is running stock firmware.

yeah that was the other issue: when we started to try to datalog it the last time, the CAN module prevented us from even being able to log the car.
all sorts of errors and blank "logs".
He's now thousands of miles away from me so he's gotta figure both those things out, maybe Ed (turbofan) can help him somewhat, I dunno.

Can someone edit the title. Barametric correction is making me twitch.