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      02-22-2011, 05:37 AM   #1
solidgold
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JB4 upgrade

Understand that JB4 for E89 is out. Comes with full mapping integration with dashboard display. Not sure is it a worthwhile upgrade? Anyone tried and see improvement in torque or bhp?
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      02-22-2011, 12:23 PM   #2
KINetics
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Quote:
Originally Posted by solidgold View Post
Understand that JB4 for E89 is out. Comes with full mapping integration with dashboard display. Not sure is it a worthwhile upgrade? Anyone tried and see improvement in torque or bhp?
Installed it this weekend. Running Map 1, which I believe is the equivalent to the JB3 Map 3.

Never dynoed my car so I couldn't tell you.

However, with the JB3, if I quickly accelerated (manual transmission) and did a quick shift into 2nd, there would be some jerkiness felt as through 2nd gears powerband before shifting into 3rd.

With JB4, I don't feel that. Don't know if I've really pushed it in 2nd yet to do a fair comparison.

My butt dyno says there is an improvement, but that might just be my mind justifying paying $150 for the upgrade. (I bought by JB3 used).
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      02-24-2011, 04:10 PM   #3
persian54
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i dynoed my Z4 with the JB4 Beta

My car was used to help tune the DCT maps for the Z4

353 whp and 349 whq

base was 287whp and 282wtq

JB4 only
no other modifcations
91 octane gas

55 degrees

if you want one new, let me know, i can ask around. I know a lot of people
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      04-28-2011, 03:28 PM   #4
.chris
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Quote:
Originally Posted by persian54 View Post

My car was used to help tune the DCT maps for the Z4

Are they special maps for DCT or detects the JB4 DCT and switch the map into "DCT" mode ?
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      06-10-2011, 08:48 PM   #5
BLTZKRG
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Quote:
Originally Posted by persian54 View Post
i dynoed my Z4 with the JB4 Beta

My car was used to help tune the DCT maps for the Z4

353 whp and 349 whq

base was 287whp and 282wtq

JB4 only
no other modifcations
91 octane gas

55 degrees

if you want one new, let me know, i can ask around. I know a lot of people
Getting the 35i soon, Looking to pump up the power after the first month. Where can I get a used/new one?
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