02-11-2015, 02:22 PM | #45 |
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No. Their tune for the 550i (stage 2 - which I think there is only one tune to buy now but you can add exhaust, etc in stages), advertised that the tune worked by including improved shift points in the low gears. It was explained to me by BMW of Gwinnett that Dinan engineered stage 1 to be for the motor and stage 2 to include integration with the transmission. I later spoke to Dinan tech support and they state they do not alter the tranny ECU, but they've learned how to work with the tranny ECU strategy to build a better tune. Therefore, from a dead stop, the tune launches the car - it wasn't acceleration, it was violence. Whatever you call it, they learned how to use the transmission strategy with their engine tune to scare the crap out of you.
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06-28-2015, 11:04 AM | #46 | |
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05-22-2017, 09:58 AM | #48 |
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05-24-2017, 04:41 PM | #49 |
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Drives: 2017 BMW X5 sDrive35i
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Just out of curiosity, what happens when you add the Dinan MPPK tune in regards to the digital gauge cluster that only goes to 400ft/lbs TQ? I was thinking about purchasing this.
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05-24-2017, 04:49 PM | #50 | |
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That display is just referencing a preset table in the ECU based on RPM and load and displays the theoretical HP and TRQ at those corresponding values. It is not a rolling dyno. |
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05-24-2017, 05:39 PM | #51 |
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Makes sense. It would be nice to have a rolling dyno. Could you corroborate that the sDrive makes more WHP than the xDrive due to drivetrain loss against the AWD platform? I only ask here now since I have a specialist.
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05-25-2017, 08:52 AM | #52 |
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Short answer is yes. DT losses on a RWD typically are 12-13% whereas on a AWD range from ~20-30%. BMW's seem to be in the lower end of that range but we have seen in Audi world what appears to be some ridiculously crazy AWD DT losses.
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05-29-2017, 09:06 AM | #53 | ||||
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The great thing I've noticed though is mpg. Just took a round trip between Boston and NY and the avg mpg was about 21.2mpg (mostly highway) on the 50i. curious if the tune is more fuel efficient at Comfort mode but brings better fuel economy? Filling up the tank showed 485mi to empty and was pretty consistent through the drive. Thoughts on the sluggishness? I also have a Hamann exhaust.... |
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