[geneatals]

+1 for 75% = 3 o'clock position, I was trading emails w/ T the day I opened mine up to confirm the 75% position. Also, I was the one that asked on the other forum about leaving the jb+ connected while adjusting boost...and T did reply with yes you can leave it connect...as long as you can reach it and not loose the screws...lol...

[E92murdered]

thanks! just to double check 75% is around 3.75 boost ?

Originally Posted by geneatals

+1 for 75% = 3 o'clock position, I was trading emails w/ T the day I opened mine up to confirm the 75% position. Also, I was the one that asked on the other forum about leaving the jb+ connected while adjusting boost...and T did reply with yes you can leave it connect...as long as you can reach it and not loose the screws...lol...

[samurai1200]

Mike --

i havent recieved my jb+ yet, but is the blue dial a pot or a multi-position switch? or a multi-position pot? also, what value is it?

reason i ask is i think i'm going to put a new one on that will allow me to change settings without opening up the unit.

or... does the pic software not read the pot's value continuously, so it doesnt matter if you change it while its plugged in/booted up?

thanks,
daniel

[E92murdered]

who has upped the boost? and has a bt scanner? any insight would be nice

[geneatals]

Originally Posted by bmwowner619

who has upped the boost? and has a bt scanner? any insight would be nice

member DELTA BMW has scanned with his BT @ 75%, his thread is around here somewhere...

[hotrod182]

I have been running my car pretty hard at sea level, no codes thrown at 75% setting.

Also, if you want to adjust it without removing the unit, I believe it would be pretty simple to drive a hold in the case, so you could simply insert a small screw driver and turn the potentiometer. It would be pretty easy to do it by feel. I don't really think you have to worry that much about water intrusion in that area of the engine cover. You could even cover the drill hole with a piece of electrical tape if you are worried about it.

[asneakyrocker]

im about to buy the JB+ and im not sure if I am pre or post 29.2... but i do have an early 07... i dont know if that matters....

anyways I'm probably going to turn up the boost to at least 75%...

sooo my question is if i am pre 29.2 I don't even need to worry about to tuner codes right?

and if I am post 29.2 then i should buy the cable to clear the codes right?
buuuut is there someone with a post 29.2 that turned up the dial and hasn't gotten codes?

also regardless of 29.2 or not... if I turn up the boost with the JB+ all the way or even 75% i wont F up the engine... will i?

thanks for whoever replies!

[hotrod182]

Originally Posted by asneakyrocker

im about to buy the JB+ and im not sure if I am pre or post 29.2... but i do have an early 07... i dont know if that matters....

anyways I'm probably going to turn up the boost to at least 75%...

sooo my question is if i am pre 29.2 I don't even need to worry about to tuner codes right?

and if I am post 29.2 then i should buy the cable to clear the codes right?
buuuut is there someone with a post 29.2 that turned up the dial and hasn't gotten codes?

also regardless of 29.2 or not... if I turn up the boost with the JB+ all the way or even 75% i wont F up the engine... will i?

thanks for whoever replies!

My car is running fine at 75%, 91 octane, at sea level, mild temps (60's).
I have the newer software, no codes at sea level. When summer comes around, or if you are racing at 4000ft elevations, you might want to return it to the default setting.

[E92murdered]

would be a great improvement.!

Originally Posted by Ziggy99

As u said, its a good improvement. Dont give BMS more ideas

[fuzzybacchus]

Hey, so i hear people saying that 3 oclock is the default postion, but the photo and install instructions all show the dial to be at what i'd call 'noon' (halfway between min and max). can any one let me know what direction "noon" is in relation to the photos and in taht context is default "noon" or "3"? i just bought a used one of these and i want to know before i go installing it.

[babyboss]

Jb+ with octane & settings on 50/75/100% boost settings caused car to jerk & gearbox confused on changes ..
Minimum power only in midrange & loss of power @ higher rpm on dyno ..
Removed it & car was smooth as butter again ..

[Antetokounmpo]

Originally Posted by fuzzybacchus

Hey, so i hear people saying that 3 oclock is the default postion, but the photo and install instructions all show the dial to be at what i'd call 'noon' (halfway between min and max). can any one let me know what direction "noon" is in relation to the photos and in taht context is default "noon" or "3"? i just bought a used one of these and i want to know before i go installing it.

you need to spend $100 and get MHD. Sell that JB+ ASAP

[Wilt]

Originally Posted by bmwowner619

lol can someone answer this?

Per Berger documentation:

The JB+ is adjustable from 0psi over stock to 4.5psi over stock...The default settng of 3pm on the dial is ~4psi over stock.

[oVeRdOsE.]

Originally Posted by Wilt

Per Berger documentation:

The JB+ is adjustable from 0psi over stock to 4.5psi over stock...The default settng of 3pm on the dial is ~4psi over stock.

can you PLEASE explain me your process to this post, very curious !

[Wilt]

Originally Posted by oVeRdOsE.

can you PLEASE explain me your process to this post, very curious !

Unscrew 2 screws on JB+ housing, remove outer casing to get at the potentiometer that controls boost. 3pm position of pot is Berger default setting, gives 4psi boost, per Berger website.
The range of control is 0 - 4.5 psi. My unit (purchased used) does not have pot appearance matching post 1, nor description of markings in Post 5.

I only want modest boost, as I do not want to have to run 93 octane...here in CA only 91 octane is readily available at all stations. So I set my pot to about 1/2 way between fully-counterclockwise position and 3pm...guessing it s about 2 psi (halfway between 0 and 4psi). Unfortunately I cannot find any information on Berger site about setting positions other than their default at 3pm for 4psi.
Many owners expressed being quite happy with 2psi modest boost, one benefit was that at full boost and high rpm the engine was not as smooth, but 2psi was smooth as stock with added HP & torque. There is speculation voiced by several that at full boost there might be some inherent factory metering programming limitation that is being surpassed, which is not being surpassed at 2psi...OTOH it might simply be the lack of added measurement sophistication of programming which is in the JB4, that better handles high boost settings.