Quote:
Originally Posted by blake.roscoe
Current build:
2018 BMW 540i
Mods: TU Pump, Catless DP, MST Intake, New Stock Gap plugs(Champion), New Ignition Coils(Went with red ones for the look, didn't need replaced)
MHD stage 2+ tune
XHP stage 3 tune
I have been trying different maps and e85 mixes for MHD stage 2+ HPFP as the 93 OCT map was having constant timing corrections.
I ended up finding that the stage 2+ HPFP 95OCT map with an e35-e38 blend runs perfectly and the stage 2+ HPFP e40 map on e45 runs almost perfectly but has an extremely high WGDG so I decided to run the 95OCT map. Below are the two logs, let me know what you guys think, curious if anybody else is running their setup this way as well to avoid high 90 WGDC.
STAGE 2+HPFP 95OCT on e37mix:
https://datazap.me/u/blakeroscoe/mhd...52&zoom=51-145
STAGE 2+HPFP E40 on e45mix: https://datazap.me/u/blakeroscoe/mhd...58&zoom=22-128 |
These are the two maps I usually run too (sometimes I switch to the 93oct if I really can't find E85). Same setup as you, b58 gen 1, tu hpfp, catless dp and xhp stage 3. I noticed the same thing that the 95oct map works well running 93 oct with around E30. To have absolutely no corrections on the E40 map you'd need over E40 in reality (probably closer to E50 as you say).
In terms of performance there's not so much in it I think between 95<->e40 except top end where the E40 is marginally faster. WGDC only goes over 90% shortly when you hit 6000+ rpm so I wouldn't worry too much about it personally. All 3 ots stage2+ maps by MHD (also the 93oct one) run really great combined with a bit of ethanol to perfect the timing advance. The MHD ots tunes seem really catered towards high octane.. with ethanol being the easiest solution for that.