Quote:
Originally Posted by mike@x-ph.com
Here are the Jb4 maps
Map 0: Stock operation, JB4 disabled
Map 1: Default performance map, 3psi peak request over stock (suitable for all 91+ RM2 fuels)
Map 2: 4psi peak request over stock (91 -93 suggested)
Map 3: 22psi absolute boost target (93 - E30 suggested)
Map 4: 23psi absolute boost target (E30-E40 suggested)
Map 5: 25psi absolute boost target (E30-E40 suggested)
Map 6: User adjustable map. RPM1500 value of less than 5.7psi make entire map6 additive target based, value over 5.7psi make entire map6 absolute target based.
Map 7: water/meth progressive map -- under development
Map 8: Low boost / VALET map
Please note, the BMW ECU can auto adjust, a slight deviation will not cause catastrophic failure.
- What's keeping the S58 from running 100% e85?
the stock fueling system cannot supply enough fuel with 100% E85 and a piggyback
-- What would happened if running too LOW of e85 for the map?
your octane would be lower than the map was set for, so the boost will be too aggressive and you risk causing damages to your car
-- What would happened if running too HIGH of e85 for the map?
you would supply less fuel than is needed to the engine
-Is it recommended to run a full tank of premium after ~4 tanks of e20-e40?
i recommend getting as close to the empty tank as possible. then use an E85 website calculator to calculate your mix. Keep adding the same mix every time so you do not have to keep calculating the E85 percentage.
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Great info, Mike. I'm starting to see how Jb4 is favored in the forum.
And for the price, I guess it wouldn't hurt to get it over the equally priced RC.