Since you have the MPPSK I will give you some info to support my statement (since I will get flamed by those who have no clue anyway)..
I have probably taken at least 20 - 30 logs and analyzed them. Even identified a way to determine which map is performing better..
Maps 1 - 3 perform (maps 2 and 3 with diminishing returns) well however has horrible drivability IMO. You either have odd shifting and/or hesitation (feels like a miss)... Inconsistent performance - Not JB4 fault but the DME changes as the environment changes (temperature, Fuel Quality, etc.)... Some can tolerate it... But I cant..
Map 6 which allows you to customly tune by RPM thats perfect IMO. JB+ im afraid would be worse than Maps 1 (lowest PSI added ) with having the MPPSK and forget about Maps 2 and 3. The MPPSK is already adding 2 - 3 PSI above stock... An additional 3 or 4 PSI will yield poor drivability and/or reduction in performance due to timing being retarded. Of course you can fix this with some e85 but again, you shouldnt do that unless you can monitor Trims and AFR ....
Thus the reason why I could not recommend the JB+ for MPPSK - JB4 is truly needed if you want performances and drivability..
My suggestion is to get the JB+ now and see if you like it.. If you dont then you can always upgrade to the JB4 through an upgrade program Burger has. They apply what you spent on the JB+ towards a JB4.
Quote:
Originally Posted by jmb2027
Thanks, I do have MPPSK.
I will hold off to wait for a sale on the JB4 then, or grab a used one when available.
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