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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > JB4 psi variations...



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      01-13-2013, 11:21 PM   #1
TexE90
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JB4 psi variations...

All I'm running is JB4 map 5, DCI, and 93 octane on my e90. When I first installed the JB4 after 3 WOT pulls, I was getting ~14-15 psi WOT pretty consistently. Now a month later, it seems to top off around 11-12 psi.

Is this fairly normal variation? Should I expect it to climb back to 14 psi in colder (warmer?) weather? Or is this indicative of something amiss?
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      01-13-2013, 11:31 PM   #2
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Normal. I would get an intercooler ASAP. Map 5 is probably picking up timing corrections and lowering boost to account for it. If you can post up a log.
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      01-14-2013, 01:31 AM   #3
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Would you say an intercooler is the most important mod after getting the jb4?
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      01-14-2013, 07:13 AM   #4
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You did not state mileage on your plugs or any changes in fuel used.
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      01-14-2013, 12:05 PM   #5
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Quote:
Originally Posted by BEAR-AvHistory View Post
You did not state mileage on your plugs or any changes in fuel used.
I'm not sure, I bought the car ~3k miles ago. I've replaced one coil in that time, but no plugs (yet). I've used 93 octane 100% of the time. Not sure what the previous owner used.

No USB cable so no logs. Though I plan on remedying this soon.
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      01-14-2013, 12:12 PM   #6
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You might want to think about plugs even if you don't know how long they have been in the car. About 25K is max for a 335 with modified boost. You can get them for about $12 each. You will need a special thin socket, $20, to remove & install them.
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      01-14-2013, 12:13 PM   #7
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log and send the csv to terry.. There isn't nearly enough information in your post for us to provide any help.. Do you have any other symptoms?
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      01-14-2013, 12:37 PM   #8
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^ Nope, everything else feels normal. I'll get a USB cable soon and get a log if it persists.
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      01-14-2013, 12:41 PM   #9
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Quote:
Originally Posted by Tdanderson View Post
Would you say an intercooler is the most important mod after getting the jb4?
Yes
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