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Bbelstad Bbelstad is online now
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Join Date: Sep 2019
Car: 08 E60 535i
Default 1st log with JB4. Advice welcomed!! - 10-09-2019, 04:58 PM

So I put the JB4 on my 08' 535I about two weeks ago and it was sweet. Slight increase in the pants dyno. I knew I was missing something though. Just wasn't giving more than about 11-12 PSI in map 1 and Map 2, although the target was about 15-16 PSI, was only getting about 11-12 still. Found a small leak at the CP/diverter valve connection (twist connection was, well, not twisted). Fixed that and again, same results. Added some VP racing Maditive and was running about 95 octane in MAP 2 for about 60 miles but didn't really have any noticeable effect.
I could hear a slight hissing when building boost as I approached the 3-5 and up PSI mark coming from the left side of the engine compartment. Almost the same type sound of my diverters when they blow off to atmosphere. (Did the 2$ diverter mod and capped the 2 intake ports so I could hear built boost for assurance I had some lol). I have checked everything I can but think at this point just going to put the Burger CP with TIAL BOV kit on and hope that takes care of what I'm hearing and not feeling. The stocker CP will blow/crack/leak soon anyways, if it doesn't already that is.
As far as my log goes. I didn't have the space to rev out 3rd all the way but hope it's enough to see if I have a problem elsewhere that I may not be looking at. Once the new CP/BOV is on this weekend and the hissing is gone I'll log again. Am curious though if all else seems ok thus far.

Thanks and any/all experienced advice is very helpful and appreciated!
Attached Files
File Type: csv 2019-10-09 12_43_50_Gear-2_Map-1 best.csv (20.5 KB, 2 views)


Hayden, Idaho

* 08' 535I.
* JB4 W/ Bluetooth Connect.
* Billy Boat 535I 3.5" *** back exhaust W/ resonator delete.
* BMS DCI.
* BMS Al PCV (Worth every one of the 4,000 pennies!!)

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