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02-22-2011, 04:37 AM | #1 |
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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, 11:23 AM | #2 | |
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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, 03:10 PM | #3 |
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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 |
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06-10-2011, 08:48 PM | #5 | |
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