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12-13-2016, 11:24 AM | #1 |
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Smooth 1st to 2nd shifts
If you have a problem with smooth 1st to 2nd shifts look at "warning cdv" posting in "engine, transmission, eco mod" section.
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12-13-2016, 01:30 PM | #2 |
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Or just remove the cdv, which will improve shifting in all gears.
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2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.
2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA. |
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12-16-2016, 01:41 AM | #3 |
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I removed the cdv, but still the gear change from 1st to 2nd is still not that smooth. Just a notchy box. The only thing that spoils my daily enjoyment of the car, other than....
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12-17-2016, 06:00 PM | #5 |
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Red line MLT fluid swap helped.
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2011 35i BMS High & Low side OCC, Custom tune, CDV delete, Eldor coils, ER Charge Pipe w/Tial BOV, ER Comp. FMIC, K&N drop in,40W LED Halo, LCI side markers, M-Factory LSD, NGK plugs, Racing Dynamics strut brace, Stubby, Windrestrictor
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12-19-2016, 12:10 PM | #7 |
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What a difference. With CDV removed clutch starts to engage as soon as you start to release pedal, fully engaged soon after. It took me a few minutes to get used to it but as soon as I did it was like I had learned to drive a stick shift again. Take off is smooth and no jerky motion going into second although I must admit 2nd gear on the 6 speed box is notchy. Definitely will switch the Red Line MTL to see if shift is improved.
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12-19-2016, 01:06 PM | #8 |
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Yes the gearbox does seem to like the revs kept up when changing 1 to 2.
I switched to Redline, made a slight difference, but ambient temperature makes the biggest difference. |
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12-19-2016, 06:22 PM | #9 |
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With the CDV delete, does that decrease the time it takes to smoothly go from 1>2? I have to baby the clutch and keep it in the biting zone quite long to get it smoothly.
CDV should have no effect on the biting point all the way to the full release from my understanding. |
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12-19-2016, 06:30 PM | #10 |
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With the CDV delete, does that decrease the time it takes to smoothly go from 1>2? I have to baby the clutch and keep it in the biting zone quite long to get it smoothly.
CDV should have no effect on the biting point all the way to the full release from my understanding. |
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12-19-2016, 08:21 PM | #11 |
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Removing the CDV eliminates the lag in clutch actuation once the pedal is released. The pedal and the clutch are once again connected directly. The CDV has a retrictive orifice that delays the clutch actuation when releasing the pedal causing the clutch engagement to be delayed.
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12-20-2016, 03:32 PM | #12 | |
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Quote:
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12-21-2016, 05:09 PM | #13 |
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Probably explains (too late) why I could never shift my 2009 3.0 properly. Drove mts my entire life including 3 Z3s before the 4.
Could never figure out why my shifts sucked. Finally went with a 2011 DCT and never looked back even though I swore I'd never have a sports car with an automatic. Good luck with anyone removing the CDV, hope that helps! |
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12-21-2016, 09:01 PM | #14 |
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12-22-2016, 10:29 AM | #16 | |
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Quote:
1. Controlling launches. I get full reign of what RPM I want to launch from instead of a mechanical launch. We still live in a time where having an auto launch is silly to most enthusiasts. 2. I always get asked if its a manual and people always say "thank goodness its not auto". Granted I would like a dct on a track only car and dct is faster. 3. With 3 pedals, its more like a dance with the car and not so much, smash and go. Downshifting and keeping your RPM up will spin your tires in gear 2 and 3 feels good brah. 4. I'm keeping this car for the long run (<100,000 miles) and wouldn't want to fix a DCT issue down the road. DCT might be more reliable, nobody knows yet but when I was shopping for my z4, there were several with transmission work done right before the warranty expired or after (some warranty lets you buy coverage to cover high cost items like transmission). 5. Nobody asks to drive your car (unless they are car enthusiasts) Cons 1. One money shift and the whole transmission can get fucked. I accidentally went to second from third but it wasn't at high rpms. I now know to back hand from 3>4. 2. You can go super smooth if you have a passenger AND dogs. 1>2 has to be super careful and slow or else they get tossed around and vomit. 3. Going up a tow truck with a flat tire. Shits scary and I'm still n00bish. 4. Driving stick when your wife is mad is no fun. haha |
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