Quote:
Originally Posted by OzBMR
After seeing hari94's log's I migrated from a DervTech remote tune to MHD Stage 2 95/102 map yesterday and have run some tests using BP Ultimate 98 (93 octane) and then mixed in some United E85 Race (106 octane) to an E30 blend (about 98 octane)
https://datazap.me/u/ozbmr/m140i-mhd...-14-15&solo=10
In summary, the DervTech tune was heavy on boost 20 - 22 PSI, heavy on fuel and low on timing due to lack of octane and high intake temps from higher boost. In saying that the car felt great and did 11.8@118mph at the drag strip back-to-back. I couldn't run more than E12 due to the boost and fuel mapping and high pressure fuel pump limitations.
The MHD tune seems a lot better for my car. Using BP98 fuel the lower boost, better timing makes the same peak power but more torque under the curve. With BP98/E30 blend it is even better with a lot more torque under the curve and about 7% - 8% more peak power. Timing with the E30 blend is very good, hitting 12 degrees plus up top. Fuel rail pressure is OK at E30, holding at about 2000 PSI minimum, similar level to the DervTech 93 octane map.
I think when XDI sort out the high pressure fuel pump the DervTech high boost tune would go very well with an E40+ mix, or an MHD tune with similar boost levels.
As far as mechanical mods go my car has the first muffler deleted and the stock rear muffler has the bypass flap open 100% and disconnected. Everything else is as delivered by BMW. |
Great comparison. Thanks for sharing.
It looks like you have some timing pull on the BP98, but timing looks way with E30. If you have a stock downpipe, it would probably be better to stick with the stage 1 map instead of stage 2.