Quote:
Originally Posted by BEAR-AvHistory
The BMS backend flash is a modification (flash) of the ECU using either a COBB or BT cable. Terry has written custom Maps for the COBB that co-exist with the normal JB4 firmware. With it you are “stacking” both tunes, JB4/ISO – COBB for a better overall result than either can produce on its own. Uses the best features of both worlds. One of the test cars a 335IS driven by MDyates ran the 1/4 in IIRC 11.8/9? @ 118mph with a pure stock car including RFT’s & a mix of E85/93 octane.
I don’t know what his mix was but without the BMS flash I was limited to approximately 60/40 93/E85. I used to put in 6 gals of E85 on a fill-up with 93 till the E85 station closed. I now run 50/50 93/100 with 8gals of 100 per fill-up.
I am in the process of fine tuning the stack for this fuel mix. The 135is has an N55 so I just did the JB4 & left everything else stock & run only 93 in it. The 335IS has in addition to the JB4/COBB an ETS 5"FMIC, Drop In BMS filter element & 245/265 Conti DW tires. All else is pure stock.
EDIT: firmware is up to 27.3
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Terry seems to have a new update every week for the firmware!
Thank you for that detailed response!
Now this BT cable, from the looks of it on burgertuning's website is the cable you use to code your car, correct?