Fuel Scalar and it's limits (Ethanol)?

carabuser

Lieutenant
Oct 2, 2019
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Z4 35i & 335i
I'm ignorant on the details of the MHD logic change, but wouldn't scaling load down on the second half of the 3 cell scaling also scale down the calculated charge air mass entering the cylinder to be lower than actual, creating the issue car abuser mentioned? Not challenging, just questioning since I don't know, and would genuinely like to know.
Correct.

The 3 cell map scaling isn't really a fix for anything, it just lets you fudge the map sensor between certain voltage ranges only as fudging the map sensor across its entire range will cause drive ability issues.

The inverse of whatever scaling is done on the map sensor needs to be applied to the load calculation to compensate for the missing reported boost. I don't think it's enough of a problem to warrant Jake making that change.
 
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Feb 14, 2024
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When you go into tuner pro to adjust the scalar. How are you accessing it? Thru the OBD2 port? Then use tunerpro? I want to adjust my scalar but do not know how to get into access it to make the adjustment and I don’t see much out there on how to. I made a thread and didn’t get the answer I need.
 

carabuser

Lieutenant
Oct 2, 2019
882
1
780
0
UK
Ride
Z4 35i & 335i
Scalar is adjusted in the tune. You need to edit the tune then download it using MHD.

That only works if you have a custom unlocked tune.
 
Feb 14, 2024
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My tune is from Ken at wedge and I have no idea how to do what you’re saying. Thanks for the reply. I’ll have to talk with him about it.