Initial Details into How The Boost Based Tuning Works with AccessTUNER

[m4tic]

would the tune need to be modified occasionally for temperature swings while using the boost target switch?

[manelscout4life]

Originally Posted by bmorrisj would the tune need to be modified occasionally for temperature swings while using the boost target switch?

I asked Christian about this and he told me the car should target the same boost targets even with changing weather conditions

[evidence]

Originally Posted by manelscout4life I asked Christian about this and he told me the car should target the same boost targets even with changing weather conditions

Point is though (this is the reason many people prefer the stock load system), if your running 20psi in the summer and pushing the limits, you might not want to be running this same boost in the winter. It would result in much higher loads and stress on the engine.

I suppose the only reason to run a boost setup like this is if you can't get your per gear set up properly, or don't want to bother with it? Configuring with the boost setup seems simpler. Losing unique configs for gears 1 and 2 make this even more a deal breaker for me also.

[fjames]

Originally Posted by evidence Point is though (this is the reason many people prefer the stock load system), if your running 20psi in the summer and pushing the limits, you might not want to be running this same boost in the winter. It would result in much higher loads and stress on the engine. I suppose the only reason to run a boost setup like this is if you can't get your per gear set up properly, or don't want to bother with it? Configuring with the boost setup seems simpler. Losing unique configs for gears 1 and 2 make this even more a deal breaker for me also.

The same is true in reverse for load tuning though. If you tune for max, safe load in cold weather, you'll be in for some pain trying to push enough boost to meet that load target in the summer.

I'm trying the boost toggle today and loving it (ambient 28F.) I have enough experience to know what boost my car can run year round so no problems there. With my max boost at max summer setting, I get 20x load reported, so no problems there.

The huge thing for me is it's much, much smoother to drive. Christian or Trey mentioned in passing that this might happen, but didn't offer an explanation. On a pair of 4-5 shifts I got no, and just a smidge of spike, so that's interesting. Just preliminary, but so far it's looking very promising for a DD.

[manelscout4life]

Originally Posted by fjames The same is true in reverse for load tuning though. If you tune for max, safe load in cold weather, you'll be in for some pain trying to push enough boost to meet that load target in the summer. I'm trying the boost toggle today and loving it (ambient 28F.) I have enough experience to know what boost my car can run year round so no problems there. With my max boost at max summer setting, I get 20x load reported, so no problems there. The huge thing for me is it's much, much smoother to drive. Christian or Trey mentioned in passing that this might happen, but didn't offer an explanation. On a pair of 4-5 shifts I got no, and just a smidge of spike, so that's interesting. Just preliminary, but so far it's looking very promising for a DD.

On the map Christian worked on is hitting 18psi with an ambient of around 34 degrees, my calculated load is showing as 2.29 which I'm guess is 229. Is this too much load?

Heres my log:
http://www.mazdaspeedforum.org/forum/foru...-fmic-bt-e.csv

[fjames]

You can't really compare loads car to car because the MAF cal will be different. I just go by what the 2871 guys see, and what fully bolted guys see, compared to me. My conclusion is anything that starts with "2" is probably okay if boost is in line. In other words, if you were running 22 psi to get that load, you should be worried, but at 18 psi, you're in the safe zone for performance tuning (which is inherently unsafe.)

Your AFR is pretty erratic and you know your pressure is fucked. I wouldn't be doing anymore logging or aggressive driving until you get that fixed.