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05-31-2011, 05:49 AM | #1 |
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JB4 Big Boost
I did a little modification on my JB4 board last night and upped the boost to possibly the peak of our Turbo's. Boost peaked at 18.5psi tapered down to 15psi. The car was running extremely strong. These boost levels are not really safe on pump fuel. Maybe more realistic when running meth. I wish I was running this boost last time I was on the dyno.
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05-31-2011, 05:52 AM | #2 |
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18.5psi LOLWUT on 98RON and no meth? Smash in some 104 race gas, spray meth and crank it to 24psi
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05-31-2011, 07:29 AM | #3 |
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so you would say it's safe to bump it up to 15psi all day on pump fuel and a tune?
what do we run standard (dont noob bash i just never thought about it before lol!) |
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05-31-2011, 07:34 AM | #4 | |
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Max Stock boost is about 8psi. Do you have a tune? |
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05-31-2011, 05:12 PM | #5 |
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No tune yet. Getting exhaust done this weekend (mid pipes cat delete) 2.5 inch each. Then I'll be looking for tune and someone Sydney local to do it!
Stock IC can't manage 15psi? I'd want to do as well that to get me safely to 15psi |
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05-31-2011, 05:24 PM | #6 |
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OP - Do you realize that there have been a few x35i engine failures running THAT much boost (18.5 psi). IF you look in the e90 forum you will find teh stick on the engine rebuild of the forum member who blew his engine when running that much boost.
I think I read that BMW only has provided maps in the DME for boost up to 14 psi. I also think that only Giac has been able to program boost level higher than this 14 psi level. I think Giac has a "flash tune" that runs 16 psi or so. IF I were you... I would be very worried when you are running that much boost on street pump gas. Esp since the juice box defeats the factory saftey features when you run the extra resistors to get up to 18 psi or more. Dackel |
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05-31-2011, 05:48 PM | #7 | |
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Your quite right in some respects but GIAC isn't the only tune to run 15+ psi.
The N54 seams to be pretty bullet proof given the low number of failures, even when letting the factory ECU manage timing as the JB4 is designed to do. There has been 2 known failures on the N54 with upped resistors on the JB4 in recent times. Quote:
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05-31-2011, 06:27 PM | #8 |
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No! I would not advise that!
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05-31-2011, 07:20 PM | #9 | |
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Maybe I should have added race fuel to the mods for 15psi. |
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05-31-2011, 07:28 PM | #10 | |
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05-31-2011, 07:30 PM | #11 | |
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CPS Offsetting |
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05-31-2011, 07:50 PM | #13 | |
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That sounds about right. However I use to run 14-14.5psi with just JB4, DCI and race fuel. Last edited by JB4-335; 05-31-2011 at 08:07 PM.. |
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05-31-2011, 08:53 PM | #14 |
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Not strictly necessary but always good to have. I don't have DPs or FMIC yet and autotune brings it to about 14psi. No codes or any real heating issues, even on the track.
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05-31-2011, 09:19 PM | #15 | |
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CPS offsetting is what the Procede does to allow it to influence timing, flashes if they are done properly adjust the actual timing maps on the ECU.
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05-31-2011, 09:23 PM | #16 | |
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FMIC, Exhaust and Tune. I did have a DCI (Injen) installed but removed it ages ago due to issues with the Highway Taxation Officials & the annoying induction noise.
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05-31-2011, 11:38 PM | #17 |
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im still learning about the N54.. i'm so used to working on Jappers, Honda and Nissan especially i'm just hesitant when it comes to these cars.
thanks for the help guys oh ps.. with the up in boost, is there a chance of spiking on a colder day? or does the computer limit the boost to max entered/ tuned for? |
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05-31-2011, 11:51 PM | #18 | |
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Depends on how your controlling the boost, other inputs your tune is reading and the safety systems your tune has.
Does not mean it does not happen, I got a couple of over boost codes recently after a HPFP replacement. I reset the WG adaptations and no more issues; even after a spirited drive to Jenolan on the weekend. Quote:
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06-01-2011, 02:11 AM | #19 |
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I have a before and after resistor swap log.
More boost and better managed wastegate duty. http://www.ozbimmer.com/phpBB3/viewtopic.php?f=5&t=234 |
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06-01-2011, 05:56 PM | #20 | |
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There are reasons why most generic tuners lock customers out of modifying their tune, generally it's because they don't want customers blowing motors and blaming the tune.
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06-01-2011, 07:10 PM | #21 | |
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10-03-2011, 07:28 PM | #22 |
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I didn't want to start a new thread so thought I'd tack my question on here.
The new JB4 update has a feature that states "Added option 5/5 to wheel controls to automatically one push DTC on startup. Works on 135i and 335i models only. Not yet compatible with 535 and 335xi models." What does this mean "one push DTC on startup?" Does this mean that the car automatically starts with DTC on rather than having to push the button to get it to activate like normal?
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