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04-01-2017, 11:35 PM | #25 |
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The DCT is good for quick lap times, but you will need to consider the cooling system of the car. The DCT transmission puts additional load on the cooling system, that is probably marginal anyway. When the DCT transmission gets hot, the shift because a bit slower and delayed. Eventually the DCT will shut itself down and shift into neutral. There are some options:
* Use higher % of water, and less antifreeze that can increases the heat transfer efficiency of the cooling system. * Use BMW PPK2 cooling solution that includes a separate water radiator on the left hand side of the car. * Install a custom transmission cooler that fits in the left hand side of the car. * Install an aftermarket alloy heatsink transmission sump. I did the first two items on the list, and performance was sometimes marginal but basically functional. IOW, The Toyo R888 tires overheated before the transmission did. |
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04-02-2017, 12:18 AM | #26 | |
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04-02-2017, 01:24 AM | #27 | |
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04-02-2017, 09:01 PM | #28 |
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Dumb question...which radiator for a car with DCT (manual or auto)? Thx!
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04-02-2017, 09:02 PM | #29 |
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Do all 135's come with the passenger side oil cooler? Or just M-Sport?
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04-02-2017, 11:51 PM | #31 |
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Were you there today in the black 135i with NCRC? I was in the silver 135i
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04-03-2017, 08:24 PM | #32 |
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OK, biased question on this forum but, you look like a trustworthy bunch...
Quick poll... 2012 135i M-Sport with DCT with 70K miles for $17K or 2007 Porsche Caymen S Manual with 120K miles for $21K
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04-03-2017, 09:00 PM | #33 |
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Coin toss for me... dual purpose or track only?
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04-04-2017, 07:14 AM | #35 |
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04-04-2017, 08:10 AM | #36 |
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In general I would say the 135 if dual purpose. However IMO you need to budget time/money to ensure their track worthiness (many of the parts listed here).
The Cayman is a better track car although I would be worried about the IMS bearing on a 2007 if it hasn't been already addressed. |
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04-04-2017, 10:37 AM | #37 | ||
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1. Fluids replacement (oil, DCT, brake, PS, coolant) 2. Drop in K&N air filter 3. Aftermarket FMIC (this was the upgrade on my 335i that was most impactful IMO) 4. Replace water pump and thermostat (these fail at 75-85K on 335i's...assume these are the same design.) Toying with the idea of getting a tune from WedgePerformance right away if I get the 135i, just to have the ability to turn off the brake nannies more than power, for now. Quote:
Proves that every car has an Achilles heel. Except the 1993 Toyota Camry, apparently. http://www.theonion.com/article/toyo...really-s-50480 Thx for the tip. I did some reading and, the only bit of good news is that the 06-08MY's IMS's are much less prone to failure. The bad news is that they are not user-servicable... I will ask the dealer with the Cayman about whether the car has had the IMS replaced. If not, I will pass. Thx for the heads up.
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04-04-2017, 11:14 AM | #38 | |||
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Also for y'all CA based folks, I'm working on partnerships with track day groups for this page I threw together (def work in progress) catrackdays.com
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04-07-2017, 05:34 PM | #39 |
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Thx, all! Was very helpful. Got this one: http://caseattle.com/2012-BMW-135i-C...-98109/6136806
Very fun! And definitely feel more "connected" to the road than my 335i (and it feels pretty good). Also, initial impression is that DCT is awesome. Only thing I can't figure out so far is how to get bluetooth music to work with my phone...
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04-07-2017, 09:05 PM | #40 | |
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04-10-2017, 05:27 PM | #41 | |
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04-10-2017, 05:32 PM | #42 | |
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I personally run: - Distilled water + water wetter (plus a smidge of coolant) - FMIC - Dinan Oil Cooler - Custom ATF cooler - Little 50/50 methanol - e30 tune ** I've never gone into limp mode due to oil, ATF or water temp and I've been tracking this car for ~2yr now (generally in ~100* weather)
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04-10-2017, 06:30 PM | #43 | |
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Your car has DCT transmission, right? Do you know if your car retains the stock 'Heat exchanger unit' that couples the AFT fluid temp to the radiator water temp? I previously ran Redline water wetter in my car (2 bottles of water wetter + 10% BMW coolant + demineralised water). However I noticed there was some solid precipitant floating in the coolant reservoir after only 6 months. I start to have some doubts whether the water wetter is compatible with BMW coolant. In general you need to be careful about mix different coolants, due to risk of incompatibility of the anti-corrosion additives in the coolant. These days my car has standard 50/50 BMW coolant mix and is not being used for track usage. The issue in the coolant reservoir seems to have cleared up after a coolant flush. |
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04-10-2017, 06:32 PM | #44 | ||
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What is your custom ATF cooler setup, if you don't mind me asking?
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