Thread: JB4 upgrade
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      02-22-2011, 11:23 AM   #2
KINetics
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Drives: Z4 sDrive35i
Join Date: Aug 2008
Location: Irvine, CA

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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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