02-16-2024, 04:38 AM | #89 |
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I gave it a stab since the temperature was in the mid 60s yesterday and "only" 37 this morning.
First attempt was the best, still invalid, but 12.5@122 with a 2.2 60'. Two flubbed attempts after that, then other cars and 3 deer on the shoulder convinced my inner grown-up to reassert himself. This is the first time I've really hammered on this thing from a stop and tried to nail the shifts. The lack of "no lift shift" in this car is shocking and the dead spot in the acceleration on the shifts is equally as shocking. That has to be a good .2-.3 seconds of "blah" and it feels even worse if I try to powershift (and three gear changes equals almost a full second of "blah"). That characteristic doesn't really show up as glaringly when I'm just whizzing around on the backroads, and I generally like the "shift-surge" feeling. However, when trying to make acceleration runs, it feels a little frustrating.
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'21 M2C, HS, MT, EP - AA EL + Axle Back, FMHE, "Enabled"
Past - '09 335i Sport, '11 M3 ZCP Sedan, '11 550i M-Sport Also - '94 F-150 Lightning (mild, mid-mount turbo), '95 F-150 Lightning (big motor, big turbo), '15 Chevy SS Sedan (supercharged) |
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captain slowly725.50 FaRKle!4023.50 |
02-16-2024, 07:23 AM | #90 | |
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chris7197353.00 |
02-16-2024, 07:48 AM | #91 | |
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2024 G20 M340i Melbourne Red/Cognac 2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg 2007 E91 328i Silver, slushbox, Eibach fr/E93 M3 rear sway bars, ARC-8 |
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captain slowly725.50 |
02-16-2024, 12:33 PM | #92 |
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Yeah, I agree, it was a fairly clean run - and actually surprised me at how well it dug with a little clutch slip. I was full in it by halfway through 1st gear. I figured I'm at that point where I can improve the ET a bit, but probably not much more in the way of MPH (it was 122.8). Shifting was a little sloppy on that attempt, but I wasn't disappointed in it overall. I tried to be a lot sharper on the next two attempts, but that torque cut and the CDV behavior on the 1-2 shift were killjoys.
I may try to game it with a couple of gallons of E85 or some Torco (currently on 93 octane) and some weight reduction just so I can try for 125+. And do keep in mind that my car does have a cat back exhaust on it. I don't know if that makes any difference at all, but it's not "tune only" whatever the case.
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'21 M2C, HS, MT, EP - AA EL + Axle Back, FMHE, "Enabled"
Past - '09 335i Sport, '11 M3 ZCP Sedan, '11 550i M-Sport Also - '94 F-150 Lightning (mild, mid-mount turbo), '95 F-150 Lightning (big motor, big turbo), '15 Chevy SS Sedan (supercharged) |
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02-19-2024, 04:48 AM | #93 |
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That "blah" spot is so bad that the car actually slows down on the 2-3 and 3-4 shifts...
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'21 M2C, HS, MT, EP - AA EL + Axle Back, FMHE, "Enabled"
Past - '09 335i Sport, '11 M3 ZCP Sedan, '11 550i M-Sport Also - '94 F-150 Lightning (mild, mid-mount turbo), '95 F-150 Lightning (big motor, big turbo), '15 Chevy SS Sedan (supercharged) |
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02-21-2024, 07:26 AM | #94 |
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I'm an engineer, so I love digging around in information. As an interesting (to me) visual experiment, I overlaid my pass with the one that MSH_ posted earlier in the thread. The compressed X-axis in the overlay is an adjustment I made for the different time scales (11.5x vs 12.5x).
I've never been one to accept the MT vs AT/DCT acceleration favoring the AT because of the way I shift, but in this car, the difference is extremely obvious.
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'21 M2C, HS, MT, EP - AA EL + Axle Back, FMHE, "Enabled"
Past - '09 335i Sport, '11 M3 ZCP Sedan, '11 550i M-Sport Also - '94 F-150 Lightning (mild, mid-mount turbo), '95 F-150 Lightning (big motor, big turbo), '15 Chevy SS Sedan (supercharged) |
02-21-2024, 10:23 PM | #95 | |
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medphysdave4596.00 |
03-01-2024, 05:29 PM | #96 |
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had my 3rd service today, which includes spark plugs. My car has pretty much 20000 miles on the dot and has been tuned for roughly 8000 miles. I'm being told (didn't get them back to verify) that they were well worn, and the car feels much more responsive now. Could be the placebo effect, but maybe not. So going forward, I plan on doing plugs every 20k max. I suggest you do too.
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03-10-2024, 02:46 PM | #97 | |
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For s55, 20k miles is ok. If it is remapped, you can even consider changing every 17.5k. |
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