12-26-2019, 10:43 AM | #24 | |
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You might be able to do the "old style" two person method w/ cylinder prefilled. But the reverse bleed works best, and is super fast.
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12-26-2019, 12:47 PM | #25 | |
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Take it from the OP and me, you will save time, effort, and a whole lot of cursing if you just do it with a syringe. Same as Tchao, I was not able to effectively bleed it doing it the traditional way. Reverse bleeding is actually really easy. Just have someone help you take out brake fluid from the reservoir as it fills up due to you pumping in new fluid from the slave side. Easy as pie! |
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12-27-2019, 08:13 PM | #27 | |
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12-30-2019, 03:05 PM | #29 |
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Little off topic but along the same lines (ha!) as removing the CDV. I removed the CDV - washer and rubber - no leaks, and I installed an ultimate clutch pedal, and lots of spacers on the clutch stop. Great! Cut clutch pedal travel in half and no more ambiguous engagement point. My question: for those of you who have removed the spring off the clutch pedal, did your pedal get stiffer? I'm not referring to the small light return spring, I mean the larger spring behind the clutch pedal.
I moved the spring to the middle position on the UCP. It was an improvement over stock but clutch still feels a little artificially springy. |
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01-21-2020, 02:05 PM | #30 |
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I am loving this thread.. 6MT driver my whole life and 1st and 2nd still occasionally feel weird or not a smooth shift in my F32. I have to seriously look at this.
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01-21-2020, 02:43 PM | #31 |
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and then I found this.. can't decide if this is a good way of doing this or not candidly.
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01-21-2020, 02:46 PM | #32 |
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I really really want to do this mod, but I also know BMW did the CDV for good reason in the turbo cars. The turbo motors generate so much more torque than the naturally aspirated motors of the past and the ZF 6MT really hasn't been upgraded except for stronger syncros on the 1-2 and 2-3. All this added torque, especially on modded cars, teamed with the torque multiplication of the gears themselves, can put a real strain on the syncros and gears on shifts. If you're in the habit of slamming the 1-2 and 2-3 shifts, this mod may not be for you if you want the 6MT to last as it's not serviceable and parts are not available. Your only option is a rebuilt 6MT from BMW or a used one.
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01-26-2020, 07:38 PM | #33 | ||
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celsdogg327.50 |
01-26-2020, 07:39 PM | #34 |
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My way is much easier. Plus you keep the stock slave in case you want to revert back to stock. Its only $60.
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01-27-2020, 12:04 AM | #35 | |||
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01-27-2020, 08:13 AM | #36 | ||||
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01-27-2020, 02:16 PM | #37 | |
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Also you shouldn't need to do the reverse bleed method if you don't remove the slave. If you already have the slave removed, just manually pump the slave if you have an issue getting it filled. That'll get all the air out, then top off the reservoir. Otherwise a regular passive bleed should work. At the end of the day it's a nice mod to smooth out shifts, but it puts the drivetrain more at your mercy. Drive smart and it won't do anything negative. It basically allows you to drive the car hard when you want to, at the expense of allowing your car to take the abuse when you make mistakes. |
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01-27-2020, 02:19 PM | #38 | |
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Nice!! Awesome you are on here.. so if you dont unbolt the slave, just pull the line then pick out the CDV, you dont even have to bleed it??
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01-27-2020, 02:21 PM | #39 |
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Still bleed, but it'll be much easier than putting a completely empty slave in it's place. If you do it fast, you'll just get a few drips of fluid if any.
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BMW DIY Guy3078.50 |
01-27-2020, 02:37 PM | #40 | |
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We all know the 1-2 syncros on the ZF 6MT fail often, even in stock 3/4 series, M235/240, and M2/3/4 cars. The syncro issue isn't the CDV. It's the torque of these turbo motors. Remove the CDV and you increase the engagement action of the clutch on the shifts. Instead of the CDV allowing the clutch to absorb the driveline shock, more of that shock is transmitted directly to the transmission including the syncros. I rarely slam the 1-2 on my M235 6MT which has a catted DP and Dinan Stage 2. I've also never experienced any slippage on hard 1-2 and 2-3 shifts. If and when I do the CDV, I sure as hell won't be slamming the 1-2. Plus, there really isn't a situation I can think of short of 1/4 mile racing where slamming the 1-2 is necessary.
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01-28-2020, 06:16 AM | #41 | |
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Have any links for the synchro issues? This is the first I've heard of that. |
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01-28-2020, 02:30 PM | #42 |
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Do a Google search of 2nd gear grind, 6MT replacement, etc. Numerous automotive publications have also reported 2nd gear grinding on their 6MT M2 and M3 test cars. Overall, the ZF 6MT is a stout transmission, but it's 1-2 syncro is its Achilles heal.
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kern4174449.50 |
01-30-2020, 09:08 AM | #43 |
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I meant slamming gears with mods on stock CDV will slip like a mofo.
You def need this CDV delete. No way you can shift fast without smoking the clutch and glazing it. For example back in the day just on JB4 map 1 or 2, I would already slip the clutch if I were to shift fast. Now a days with MHD/BM3 Ethanol tunes, you will forsure super glaze your clutch if you tried to shift fast with the CDV. I dont usually slam gears, but when I want to, like in a drag situation, I want to know I can.
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05-11-2020, 05:15 PM | #44 |
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hey there,
so i know this is the F30 forum but just to get this right - the F series (except 1, 3, 4 series and X5/6 it seems, when looking up the slave cyl) has the same slave cyl as just about all the E series cars minus X5/X6 E. So it seems to me, the cars that have this slave cyl have the CDV located in the stock line - like my E91: http://bmwfans.info/parts-catalog/E9...lutch_control/ Imo the diagram clearly shows the CDV in the line? So no CDV in the slave needed. However, for the exceptions, like F30, the line does not have a CDV in the line. If you combine those CDV-less lines with CDV-less "E" slave -> no more CDV Oh and I'm pretty sure BMW did this for drivetrain protection and longevity just as much as for "improved" driveability and NVH for ppl who prefer this laggy indirect shit over "sheer driving pleasure" |
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