Question about how JB+ operates

misterjim · 03-28-2013, 07:18 PM

I'm considering the JB+ for my 335 cab. Yes I know it's not a "real tune" like Cobb or the JB4 but I'm interested in a modest bump in power. Does anyone know exactly how it works? From the searches I've done it appears that it fools the ECU into thinking the boost is actually lower than it really is. If this is so is there any harm that can come from this? Any concerns about the engine running too lean?

EJ_3 · 03-28-2013, 07:37 PM

It's pretty much just a boost controller knob. Plug it into the tmap and turn up the boost a little bit. It's not the BEST tuning solution, but it work. I don't know the exact science of it though. As long as you keep it at 75% and under, you'll be good.

135Pats · 03-28-2013, 07:48 PM

Cobb stg1 drive is a modest bump in power. And youll have more options when you inevitably desire more power.

BEAR-AvHistory · 03-28-2013, 09:26 PM

You are better off with a JB4 or COBB.

racerg35335 · 03-28-2013, 10:00 PM

From what I understand it tricks your tmap sensor into thinking it is at a higher elevation thus requiring more boost to achive the same load. So yea... basically it just raises the boost. For the record I loved my jb+. It really is more than a "modest" boost in power. On most platforms you would spend thousands getting the same boost in power as a $120 (used) jb+ can give you. Will you want more... probably.. will it satify you for the time being and if you are not looking for 400whp.. I say yes.. will it put a big smile on your face... defi Honestly I think I is quicker (at 75%) than cobb stg 1 drive and comparable to stg 1 aggressive. (I am running cobb now with a custom e30 map and have experience with both). Let me know if you are looking for one. Mine has been sitting in my glove compartment for 6mnths. Lol.

zeel · 03-28-2013, 10:05 PM

Get a used jb4 instead. You won't regret it.

jaykayelemenohpee · 03-29-2013, 12:25 AM

I've been running it for a few years and love it. Set it and forget it. Its a 2 minute install. Cheap as can be. Its not the best solution but it works. Like others said keep it below 75% and itll be fine. Its the best $125 you can spend on your car.

junitos · 03-29-2013, 12:47 AM

jb4 is power when you need it

stock when you don't

boostE92d · 03-29-2013, 06:24 PM

I have a jb+ and it's set at 100%. What is the issue with that?

03-28-2013, 07:18 PM	#1
misterjim Private First Class 35 Rep 191 Posts Drives: 2008 e93 335i Join Date: Apr 2007 Location: Rochester, NY iTrader: (0)	Question about how JB+ operates I'm considering the JB+ for my 335 cab. Yes I know it's not a "real tune" like Cobb or the JB4 but I'm interested in a modest bump in power. Does anyone know exactly how it works? From the searches I've done it appears that it fools the ECU into thinking the boost is actually lower than it really is. If this is so is there any harm that can come from this? Any concerns about the engine running too lean?
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03-28-2013, 07:37 PM	#2
EJ_3 Colonel 371 Rep 2,839 Posts Drives: e92 335i, e34 525i & e60 530i Join Date: Aug 2011 Location: N Las Vegas iTrader: (13) Garage List 2007 BMW 335i [8.34] 2016 Ram 1500 Sport [8.00] 1994 BMW 525i [10.00] 2007 BMW 530i [8.66]	It's pretty much just a boost controller knob. Plug it into the tmap and turn up the boost a little bit. It's not the BEST tuning solution, but it work. I don't know the exact science of it though. As long as you keep it at 75% and under, you'll be good. __________________ click here for mods
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03-28-2013, 07:48 PM	#3
135Pats Major General 456 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	Cobb stg1 drive is a modest bump in power. And youll have more options when you inevitably desire more power.
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03-28-2013, 09:26 PM	#4
BEAR-AvHistory 2020 Z4 M40i - 2022 M4C Convt 3126 Rep 5,264 Posts Drives: 2020 Z4 M40i - 2022 M4C Convrt Join Date: Jun 2011 Location: Raleigh, NC - OIB, NC iTrader: (0) Garage List 1965 COBRA (FFR rep ... [8.57] 2023 Jeep Wrangler ... [9.50] 2009 Yamaha V-Star [0.00] Cars 2-BMW, 2-FORD, ... [0.00] 2023 Ford Expeditio ... [0.00] 2020 Z4 M40i [10.00] 2022 BMW M4C [7.25] 1998 FORD Ranger 4X4 [0.00]	You are better off with a JB4 or COBB. __________________ Kevin Dravit Gray, Black Leather, Moonlight Roof, Red Calipers 2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT
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03-28-2013, 10:00 PM	#5
racerg35335 Private First Class 10 Rep 101 Posts Drives: Space gray 335i coupe Join Date: Feb 2012 Location: Greenwood, SC iTrader: (0)	From what I understand it tricks your tmap sensor into thinking it is at a higher elevation thus requiring more boost to achive the same load. So yea... basically it just raises the boost. For the record I loved my jb+. It really is more than a "modest" boost in power. On most platforms you would spend thousands getting the same boost in power as a $120 (used) jb+ can give you. Will you want more... probably.. will it satify you for the time being and if you are not looking for 400whp.. I say yes.. will it put a big smile on your face... defi Honestly I think I is quicker (at 75%) than cobb stg 1 drive and comparable to stg 1 aggressive. (I am running cobb now with a custom e30 map and have experience with both). Let me know if you are looking for one. Mine has been sitting in my glove compartment for 6mnths. Lol. __________________ Space Gray 6mt e92, coral red,Cobb tuned, custom e30 map, bms DCI, ETS FMIC, walbro 455 lpfp.
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03-28-2013, 10:05 PM	#6
zeel Lieutenant 14 Rep 579 Posts Drives: 08 AW e92 335i Join Date: Nov 2010 Location: MD/NOVA/DC iTrader: (2) Garage List 2008 bmw e92 335i [7.34]	Get a used jb4 instead. You won't regret it.
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03-29-2013, 12:25 AM	#7
jaykayelemenohpee First Lieutenant 9 Rep 334 Posts Drives: 335i Join Date: Mar 2013 Location: Central Phoenix iTrader: (0)	I've been running it for a few years and love it. Set it and forget it. Its a 2 minute install. Cheap as can be. Its not the best solution but it works. Like others said keep it below 75% and itll be fine. Its the best $125 you can spend on your car.
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03-29-2013, 12:47 AM	#8
junitos Banned 27 Rep 385 Posts Drives: T0PL3SS BIMM3R Join Date: Nov 2012 Location: VVest Coast iTrader: (1)	jb4 is power when you need it stock when you don't
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03-29-2013, 06:24 PM	#9
boostE92d Private First Class 61 Rep 174 Posts Drives: 12' 335is Join Date: Jul 2012 Location: Houston,TX iTrader: (0)	I have a jb+ and it's set at 100%. What is the issue with that?
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