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04-27-2009, 03:12 PM | #1 |
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Steptronic shifting early in manual mode?
Hey guys, I was doing some g-tech 0-60 runs the other day on a private road my friend owns and noticed something odd.
My car is a 135i steptronic w/ SSTT by the way. Well, the car seems to shift early, even in manual mode. The shifts occur around 6700 RPM. Any idea what this could be? Is there a way to fix this?
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04-27-2009, 04:02 PM | #2 |
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I just find it strange, because I thought it only upshifts in manual mode at redline (7000 revs).
I jumped on youtube to watch some acceleration videos and noticed some steptronic cars reaching close to 7200 rpm before the transmission shifted for them. interesting...
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04-27-2009, 04:36 PM | #3 |
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I have a 128 but from what ive seen on my car, if you put it into manual mode from DS mode it holds the gear till redline then it shifts if your just in DS it'll shift earlier but when manual its waiting for you to shift but if you don't shift it, it will eventually shift at redline.
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04-28-2009, 12:29 PM | #5 |
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How do you trick it to redline?
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04-28-2009, 05:45 PM | #6 | |
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Seems if I really lean on the gas while in SD it stays in lower gear for longer time. If I am mellow shifts normally. I think the 1 knows what Im thinking just by how hard I hit the gas! |
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04-28-2009, 05:55 PM | #7 |
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J.M. - what was ur best 0-60 time?
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04-28-2009, 06:03 PM | #8 |
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I tried again in manual mode today, starting in 1st gear. It shifts close to between 6500-6700. I know this is claimed to be faster, but I think I'd rather let the decision to be up to me if I decide to shift up before redline.
Berduderunner, I got her down to 4.56. Traction was pretty good, launched around 1800 RPM. I will try to get faster when it's cooler/less humid outside.
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04-29-2009, 03:06 PM | #9 | |
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Reason: to achieve a certain (higher) rpm at the next gear. I am not saying this is definitely quicker to hold the gear to the red in the 135, but I'm pretty sure that is why you would do it. |
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04-30-2009, 01:00 AM | #10 | |
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A dyno was posted showing the clear drop off of torque and power in the revs above 6-6.5k. The point was made that it makes sense to shift the car before this point to keep the power up. I suggest the reason to hold the gear higher (or to the red possibly) would be to land the next gear that much higher in the rev band. What technique has been used and is showing the fastest 1/4 mile times? BTW, mine is a manual. I have not raced it, and for street sport driving I rarely hit the red. I am just curious as to what actually is faster (albeit maybe by tenths of a second). |
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04-30-2009, 10:24 AM | #11 | |
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(Not at all sure if that answers your question!) Tom |
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