N54Tech.com - International Turbo Racing Discussion
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thenewrick's Avatar
thenewrick thenewrick is offline
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Default 335i wrecked, getting 335is and need advice - 12-27-2016, 06:44 PM

A younger fellow didn't look both ways at a stop sign and T-boned me; wrecking my car. I'm now looking at getting a 335is. I want a quieter and more refined ride this time so my mods will be kept to a minimum.

I'm thinking about an intercooler only for power mods.

Since the 335is has a slightly upgraded exhaust and I'm running 93 octane, can I use the stage 2 JB4 map? What about the auto-tune map? I'd be happy to run logs on both and send/post them where ever.

I'm also a total newb to automatics/DCT. Do these benefit from some type of tuning as well to make them shift smoother/more quickly?

Anything I need to know about JB4 and 335is that is different from a MT 335i?
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Grip Grip Grip Grip is offline
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Default 12-27-2016, 07:33 PM

I just picked up a 335is myself and I'm very happy with the choice. I'm running a MHD stage 2+ tune on mine and it's bone stock (except for plugs). I'm sure I'll need to add an intercooler this spring, but that will be the extent of the mods I have planned for now. My old 335i was FBO with inlets. Best of luck with yours.


2009 335i XDrive (wife's)
Sold - '11 335is - N54 - DCT
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Sold - '08 128i (wife's)

Last edited by Grip Grip; 12-27-2016 at 07:43 PM..
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A418t81 A418t81 is offline
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Default 12-27-2016, 07:33 PM

If you are buying a DCT model, you must get a BEF to keep the trans happy and prevent any slipping.


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'09 997.1 6MT: FBO, 65mm VTGs. 730 whp
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phil1320 phil1320 is offline
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Default 12-28-2016, 07:29 AM

I would recommend just doing MHD custom (not off the shelf) flash for the DCT. Some people have caused damage to their DCT by using JB4 but I'm sure the back end flashes have came a long way since then. Since it sounds like you are staying twins and not doing very much mod wise, I would have BuraQ tune your car. He is very good and is one of the best when it comes to tuning the DCT trans. I have a '11 335is by the way. You will love the DCT!
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FL335 FL335 is offline
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Unhappy 12-28-2016, 08:35 AM

I'd have to recommend a custom MHD flash only solution as well. My JB4/BEF just was never as smooth as it should have been and as the power level went up the slipping began. If you're hellbent on staying with the JB4 at least get a custom back end flash for it.


'13 LMB 335is DCT | MHD/BQ Tuning |
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phil1320 phil1320 is offline
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Default 12-28-2016, 08:45 AM

FWIW, I have a single turbo on mine and I'm running around 600 whp on the wastegate tune with no slipping at all.
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thenewrick thenewrick is offline
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Default 12-28-2016, 07:54 PM

Interesting. So I need to find a pro tuner to do a dyno or road tune just for the transmission after the jb4 power is added? Wasn't expecting this.
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phil1320 phil1320 is offline
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Default 12-29-2016, 06:24 AM

Quote:
Originally Posted by thenewrick
Interesting. So I need to find a pro tuner to do a dyno or road tune just for the transmission after the jb4 power is added? Wasn't expecting this.
BuraQ will tune the whole car. But he knows the most about DCT trans on our platform and will make adjustments to save your DCT. If you still decide to go JB4, get a BEF like what has been said already.

If it were me, I would just get MHD, email BuraQ, pay for tune, load to car, have fun. I've heard too many stories of people with DCT that permanently damaged their trans because of the JB4. This isn't as common as it used to be because of better BEF's but why chance it? BuraQ is a boss for the DCT
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Default 12-29-2016, 08:38 AM

I just went from JB4 + MHD BEF to MHD only. The car does drive smoother now. I'm not really a DCT fan. I wanted a 335is though, and a MT IS was just too hard to find. I prefer my last MT 335i. It was a non-sport model though, and I just love the MSport cosmetic stuff, the black headliner and the aluminum trim of the IS. I agree that BuraQ probably has the best grasp on DCT tuning so far. I wouldn't rule out a tune from Trebila either though. I ditched my meth kit when I sold the JB4, I'm just not a fan of running meth on a flash only tune. I'm moving to Europe though and didn't feel like searching around for methanol.


2011 335is DCT, FBO
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