Quote:
Originally Posted by foghat
But....if you are cruising on the highway at a constant speed, your turbos aren't doing much anyway. Would seem to me you'd want them there for passing and such. Same with crappy gas, easy enough to stay out of boost, though I imagine the dme would compensate as required.
Map switching makes sense for sure with an ecu tune if you are running different gas, but in your case why not just use map 5 for everything? Getting more consistency with map 6?
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Map 8 gets better MPG then Map 0 the BMW pass through map. You asked what its for & that's what its for.
Map 6 is for run to run consistency especially when playing with logs & making changes to the JB4's settings. Additionally my Map 6 because of a 95/96 octane fuel mix runs higher fixed boost levels across the board then the default Map 6. I am more comfortable with fixed settings although Map 5 could also work.
There were only a few 335is with JB4’s when G5 was coming out then again when it went to ISO I did a lot of test runs.
Going back to G4 I was testing Map 2 without downpipes on the 335is using 93 octane fuel with Terry's input. All the regular 335i without downpipes were recommended to run on Map 1 or 5 by BMS. The 335i & 335is have different timing advance curves from the factory which allowed this to happen.
That led to a JB4-G4 335IS 93 octane or better specific Map 6 & the additional option on the interface for 335is, 1M & Dinan.
I did a lot of G5 & G5/ISO Alpha & Beta hex file logs which were set in to Terry as the software progressed. A visible change for the N54 was Dinan being removed from interface option 6 & the COBB/BMS flash being added.
When I am using E85 I do a “that's close enough” type fuel mix so Map 5 works out very well adjusting to the changes in octane content.
As was said above you don't need instantaneous map switching but its real convenient if you are playing with the tunes