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      03-08-2012, 11:38 PM   #1
Constant.S
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Cobb Acessport

I am wondering, is anyone running COBB on their N54 Z4? If yes, is their car a DCT?
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      03-09-2012, 01:15 PM   #2
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I've been thinking about, but haven't pulled the trigger yet!
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      03-09-2012, 01:22 PM   #3
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I've shoot them an e-mail asking them hows the compatibility with the DCT and im awaiting an answer. I'll post the reply here when I get it.
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      03-17-2012, 03:40 AM   #4
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I haven't seen any specific posts about COBB + DCT but I do know, from what I have read, that increased power mapping does confuse the DCT system though. The increase power mapping does not properly line up with the gearing map, especially when you go WOT. Need to drive it in manual to get best result when more power, takes the confusion away.
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      03-26-2012, 08:45 PM   #5
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Any updates? I'm very interested for my 35is that is on order.
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      04-04-2012, 02:25 AM   #6
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there are a few 335is with Cobb from E90 N54 section which are all running fine with Cobb, DCT imo is not going to create issue with tunes.
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      04-04-2012, 04:06 AM   #7
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Quote:
Originally Posted by Ramjet View Post
I haven't seen any specific posts about COBB + DCT but I do know, from what I have read, that increased power mapping does confuse the DCT system though. The increase power mapping does not properly line up with the gearing map, especially when you go WOT. Need to drive it in manual to get best result when more power, takes the confusion away.
This may be why my car keeps popping into Neutral, i have proceed! In stock mode no issues, in map 2 it has trouble selecting the right gear at the right time IMO and pops out of D!
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      04-05-2012, 03:51 PM   #8
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Yea, i've been saying for a long time now that the DCT needs some reprogramming for higher power levels than stock Unless you drive it on Manual mode. I also started a DCT reprogramming thread some time ago asking about it.
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      04-05-2012, 09:01 PM   #9
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I was surprised about the limited gains through COBB. Stage 1 is only 20 & 20 and stage 2 and 2+ require bolt on mods (downpipes and fmic I believe) to get more. For $100 more than COBB, ESS will provide greater HP and TQ without needing any other mods. But, COBB does offer some cool user features.
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      04-06-2012, 02:37 AM   #10
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Yea, the accessport is a great datalogger!
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      04-06-2012, 07:55 AM   #11
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Quote:
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I was surprised about the limited gains through COBB. Stage 1 is only 20 & 20
what?
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      04-06-2012, 09:46 AM   #12
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Cobb Stage 1 adds something like 90hp and 100tq to an Z435i.
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      04-06-2012, 09:27 PM   #13
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Apparently not That big of a gain for the 35is. This is straight from COBB...

Re: Stage 1 & 2 Tunes for 2012 Z4 35is

--------------------------------------------------------------------------------

Laurence,

Power gains are going to be pretty nice for the Z4 35is. Because of the shared motors and powertrain, power gains will be almost identical to the 335is. The 35is tuning is fairly aggressive from the factory, but our Sport and Aggressive Stage 1 maps will add about 20 HP and 20 lb/ft of torque all across the power band. Then, as you modify your car, you can use our Stage 1+, Stage 2, or Stage 2+ maps as free downloads from our website for more power. Map switches take only a few minutes and you can log all kinds of ECU data using only the AccessPORT. If you have any other questions, let me know!

Ian

Originally Posted by wdlfbio

We ordered a new Z4 35is and doing a Euro Delivery again. It's replacing the wife's '08 M3. So, it needs to run around town as well as the M does and I want to tap out the speedometer while I have the chance in Germany/Italy

I'm lookng at various flash tunes for this motor/tranny combo (DCT). The 35is has upgraded water/oil coolers, but not an aftermarket FMIC. I'm wondering what the HP/TQ increases and curves look like for your Accessport. So far, I like what ESS has, but I like the added features COBB offers.

Here's my email if you can send me any dynos for a stock 35is.

Thanks,
Laurence


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      08-20-2012, 12:33 AM   #14
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How can the Cobb accessport only add 20hp to the is? So is the total HP less than on a 335is?
Is it even less than an n54 335i?
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      08-20-2012, 03:28 PM   #15
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I am personally running the V4 maps from Cobb and power is definitely significant, Car feels completely different. Right now only on Stage 1 with Catless DP and custom rear mufflers. I think there's been some huge power gains with the V4 maps compared to the maps previously released so that might be some of the confusion with small gains on Cobb.
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      08-21-2012, 10:02 AM   #16
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Quote:
Originally Posted by daninsyd View Post
This may be why my car keeps popping into Neutral, i have proceed! In stock mode no issues, in map 2 it has trouble selecting the right gear at the right time IMO and pops out of D!
No such issue with my DCT running ESS stg 1/2... Just saying! Sorry if slightly off-topic!

And regarding the request for different DCT maps, I am actually happy with how mine shifts well before 7000rpm in S mode. Only in M mode does it pull all the way to 7k, and if not I would have been a bit dissappointed! I can shift earlier if I want to, but if no M-mode, how could I ever try 7000rpm? One complaint however is that I have experienced 3 times now that it shifted from 1st to 3rd while in S-mode due to a bit of wheelspin (also without ESS)...
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Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).
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