[mike@x-ph.com]

Originally Posted by TopgearLA

So if you get just the jb+ , are you saying you should expect CEL? I'm interested in buying but wondering why suggest the Downpipe for CEL delete if this is cool with just a stock car.

Yes the JB4 is the only piggyback that will hide the CEL delete from catless downpipes.

[zenmaster]

Originally Posted by mike@x-ph.com

I don't believe I have seen a dyno for the M2 yet ... But JB+ adds anywhere up to 4 psi

The compensation margin for M2 overboost is only 1-2 PSI though max at sea level. We know this from the JB4.

[mike@x-ph.com]

Originally Posted by zenmaster

The compensation margin for M2 overboost is only 1-2 PSI though max at sea level. We know this from the JB4.

Good point, we need a confirmation from Terry though.

JB+ is different than the Jb4 and should add the 3.5 psi independently of what stock boost is ... Unless it has a max boost target that it will not cross

[LBBDrew]

Has anyone run this with 91 yet that can comment on butt dyno? Inb4flame, yes i know terry says there isn't much to be gained on 91

[zenmaster]

Originally Posted by mike@x-ph.com

Good point, we need a confirmation from Terry though.

JB+ is different than the Jb4 and should add the 3.5 psi independently of what stock boost is ... Unless it has a max boost target that it will not cross

Yes JB+ can add up to 3.5 psi if available, but unfortunately that much margin is not available for the M2 application (F22/F30 yes). It plugs into the MAF sensor only and therefore, logically, the ECU is still in charge of the stock max boost pressure. So whatever the stock map provides under low atmospheric pressure conditions (mountains) is effectively your gain. We know from the JB4 tests that effective available boost is maybe 2psi more over stock, due to turbo size. And that's with 93oct.

[six-n-twins53]

Anyone still running JB+ on their M2? What level? Any problems?