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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > 1/4 mile time:(



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      10-07-2013, 01:57 PM   #1
kolo123
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1/4 mile time:(

Today i went to 1/4 mile drag race, 60 degrees Wisconsion Great lakes
and run best time 13.05 and 109mph 60' 2.031 mods:OFT stage 1, fmic, catless downpipes, dci, 255/35/18 cheap summer tires 2007 coupe MT 93 oct. only issues i have is when shift second to third and third to forth i feel like LAG or "throttle closures" i dont know how to call that ...is this is normal? what u guys think?
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      10-12-2013, 09:25 AM   #2
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I glad you posted this. I was at the same track last night and I had the same lag in my 2nd to 3rd gear change. Almost felt like it lost all power for a sec and then back on. I have a 08 6MT, BB flash and a DCI. Only got two runs in and best was a 13.2 @ 108 with a garbage 2.25 60ft. I was thinking it could be the CDV if you haven't removed it. Mine is still the stock CDV. If not that I have no idea.
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      10-12-2013, 02:37 PM   #3
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as far i know it not only OFT all MT guys have this some say " if u wanna go faster change gears slower" i have stock CDV too if u find anythink how fix this... let me know
but man this is funny i had 350z MT , acura TL MT and now 335i MT and im just disappointed
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      10-12-2013, 06:53 PM   #4
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Quote:
Originally Posted by kolo123 View Post
as far i know it not only OFT all MT guys have this some say " if u wanna go faster change gears slower" i have stock CDV too if u find anythink how fix this... let me know
but man this is funny i had 350z MT , acura TL MT and now 335i MT and im just disappointed
I think it's the CDV valve. You can remove it or replace it with a modified one. Will see if that does it.
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      10-21-2013, 05:31 PM   #5
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Interested in this, I felt the same thing the last time I was at the track.

I'm also 6MT.
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      10-21-2013, 05:58 PM   #6
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I've done a lot of logging in of hard shifts on a 6MT. What I've seen (unless running way more octane than I need for the map) is that when you shift hard and let our the clutch hard, the rpm oscillates for a good part of a second. As it oscillates more knock than usual seems to occur and then it takes a couple of seconds for the timing pulls to bleed off. Additional complications are that for the stock IC guys they are usually hot enough that timing is beginning to be pulled due to charge temps, and on the shift you can sometimes hit a hole in the stock retard map that allows too much timing and you get additional knock, as well as sometimes getting knock easily at the lower parts of the load map just before boost comes back on.

I've got most of that tuned out now using ATR, but I look forward to a non-DMFW to see if the weird rpm oscillations go away on a hard shift.
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