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      02-05-2015, 12:26 PM   #14
Mike@N54Tuning.com
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Drives: 2007 335i, 2015 M3
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Quote:
Originally Posted by pigwet View Post
I'm interested in the ability of these tunes to work as designed at high altitudes. There appears to be a difference between MAF & MAP based versus MAP only tunes according to discussions here: http://forum.miata.net/vb/showthread.php?t=224799

Comments?
MAF is only used as a cross reference to load. Load is based on boost pressure, baro, and IAT, among a few other minor factors. If MAF exceeds the load values then a hidden plausibility code is triggered. Your options to work around this are to intercept or alter MAF as ESS and Dinan do, or alter them using CANbus logic as the JB4 does. Without CANbus or MAF connections you will trigger a hidden code eventually above around 50whp.

I can't stress enough how important the fuel mass connector is to tuning these vehicles at higher power levels. I'm really shocked that it appears only Dinan and JB4 offer it.

Mike
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