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      09-20-2020, 10:25 AM   #74
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Drives: BMW X5 M50i
Join Date: Nov 2019
Location: Northwest North Korea

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Quote:
Originally Posted by Kuato2084 View Post
I should've said MAX wtq +112. On the graph it looks like about +95 wtq low-end and then about +40wtq at high-end rpms which is awesome. But I see what you mean about the decline, it's way more rapid than stock after 4k rpms in comparison. At least the decline rate from mid-3k to 4k rpms is about the same and that's where the thrills are at behind the wheel.

Would performance be better overall if peak toque happens at 3k rpms like stock, instead of peaking a bit later at 3300 rpms? Or would peaking earlier be even worse for overall performance numbers (and for the transmission)?

Also, would having a little less low-end torque MAX output peak earlier help promote a mid-end torque flat curve? I don't understand why it dips so dramatically at 4k rpms.
Max driveability for us enthusiasts is achieved with a flat torque curve to redline. Torque spiking is done to inflate numbers plain and simple. They want to say if you buy X then you will get a monster torque increase. Torque spikes are awful for your tranny and the reason most tuners avoid them. Your tuners can push more boost at lower rpms then higher rpms because they lose efficiency after their rated CFM. Some tunes will spike the torque in the beginning because the turbos can run higher boost in low rpms, but as the turbos reach max CFM in high rpm ranges, they taper boost. Boost taper isn’t bad, but jacking boost through the roof to torque spike is.
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