Megasquirt Correction tables are messing me up.
06-19-14, 12:26 PM
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Correction tables are messing me up.
Okay guys, I'm getting very close to finally throwing my big H1C on my S4 6 port block but there's a few things holding me back.
I've been slowly dialing in all my fuel and spark settings both under open and closed loop but it seems like no sooner do I get it looking good and park it for the night, the next day it's basically a completely different tune. Some days it's leaner and some richer, and I'm about 110% sure it's got to be my air and baro correction tables.
I know it's build dependent but does anybody have a decent air correction table for a stock FC IAT in the stock S4 N/A location? I've been looking into a GM open element for my turbo use but I wouldn't think the table should change much if it's in the same location and calibrated correctly.
I've also been looking at DIY's MAPDaddy and was wondering if the "realtime correction" meant that the baro table would finally get used? The way I understand it right now for the stock MS3x setup is that it grabs the initial reading on powerup, looks it up in the table, applies that correction, and then you're stuck with that correction for that drive cycle. Correct? If so, would somebody happen to have a decent baro table as well as I currently have mine all at zero because my greatest elevation change is about 50' +/- 12' gps error. So I wouldn't think that would change it too much.
I've been slowly dialing in all my fuel and spark settings both under open and closed loop but it seems like no sooner do I get it looking good and park it for the night, the next day it's basically a completely different tune. Some days it's leaner and some richer, and I'm about 110% sure it's got to be my air and baro correction tables.
I know it's build dependent but does anybody have a decent air correction table for a stock FC IAT in the stock S4 N/A location? I've been looking into a GM open element for my turbo use but I wouldn't think the table should change much if it's in the same location and calibrated correctly.
I've also been looking at DIY's MAPDaddy and was wondering if the "realtime correction" meant that the baro table would finally get used? The way I understand it right now for the stock MS3x setup is that it grabs the initial reading on powerup, looks it up in the table, applies that correction, and then you're stuck with that correction for that drive cycle. Correct? If so, would somebody happen to have a decent baro table as well as I currently have mine all at zero because my greatest elevation change is about 50' +/- 12' gps error. So I wouldn't think that would change it too much.
06-20-14, 09:37 AM
#2
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If you don't drive it over tall mountains, don't worry about baro correction.
The stock location for the MAT sensor on an S4 *sucks* for heat-soak. In stock form, mazda has 2 MAT sensors, one in the AFM and one in the manifold. My thought is that they use both to figure out what the actual air temperature entering the ports is with some kind of table lookup. If you want consistent behavior though, I'd suggest using a different sensor up closer to the front of the engine bay.
The stock location for the MAT sensor on an S4 *sucks* for heat-soak. In stock form, mazda has 2 MAT sensors, one in the AFM and one in the manifold. My thought is that they use both to figure out what the actual air temperature entering the ports is with some kind of table lookup. If you want consistent behavior though, I'd suggest using a different sensor up closer to the front of the engine bay.
06-20-14, 10:01 AM
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I do plan on traveling with the car to some of the local tracks once I'm done and elevation varies quite a bit very quickly around here.
I know moving the sensor farther upstream would be better but that isn't possible at this moment. That's why I'm trying to find a decent table for the stock location so I can drive and not jerk around between 12 and 19 afr.
I know moving the sensor farther upstream would be better but that isn't possible at this moment. That's why I'm trying to find a decent table for the stock location so I can drive and not jerk around between 12 and 19 afr.
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