Thread: VAC Motorsports
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      05-14-2018, 04:21 PM   #16
First Lieutenant
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Drives: 12' X5M, 99 M3
Join Date: Jan 2016
Location: San Diego

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Originally Posted by JoeyBimX5din View Post
I have no first hand knowledge of the tuning, but what I have heard is YES it is worth the cost. I wonder if I could turn off all the limp codes in the system with JB4.
The JB4 will clear the limp mode off the dash but the ECU still keeps itself in limp mode until you turn the engine off/on cycle.

I did some experimenting by logging in limp mode and it seems like the ECU keeps the car from boosting at all ... JB4 still asks for correct targets just get no boost - There has to be some way to reset completely but I haven't found out how yet.

JB4 is defiantly worth it ... I have been running around on the E30 map and am quite pleased
2012 X5M - M5 S63TU Turbos/Manifolds, Custom Exhaust, Intake, JB4/BCM, OEM race stripes
1999 323
- M3 Clone - Hardtop - S50 Cams, S52, 3.23 LSD, Koni Sport, 18' E46 M3 Wheels