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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 map 1 why does it get to 16psi?



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      08-06-2013, 03:56 PM   #1
tommyboy0120
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jb4 map 1 why does it get to 16psi?

why does jb4 map1 get to 16psi? i thought it only goes up to 13.5

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      08-06-2013, 04:46 PM   #2
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Just for the record a proper datalog would be a more accurate method to use. (You should also be measuring boost in a 3rd gear pull from 2000 RPM to redline).

Second, 16 PSI is fine in the mid-range. It's 13.5 PSI at redline. All is normal. Enjoy your tune.
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      08-06-2013, 04:53 PM   #3
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Just for the record a proper datalog would be a more accurate method to use. (You should also be measuring boost in a 3rd gear pull from 2000 RPM to redline).

Second, 16 PSI is fine in the mid-range. It's 13.5 PSI at redline. All is normal. Enjoy your tune.
Thanks i never knew that, i thought 13.5 PSI was max boost at any rpm range
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      08-06-2013, 06:00 PM   #4
Jewber
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Just for the record a proper datalog would be a more accurate method to use. (You should also be measuring boost in a 3rd gear pull from 2000 RPM to redline).

Second, 16 PSI is fine in the mid-range. It's 13.5 PSI at redline. All is normal. Enjoy your tune.
While you're right on both counts, map 1 is only 13.5 max and begins to taper down at 5500rpm.
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Last edited by Jewber; 08-06-2013 at 06:06 PM.
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      11-12-2014, 01:38 AM   #5
tommyboy0120
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Quote:
Originally Posted by Jewber View Post
While you're right on both counts, map 1 is only 13.5 max and begins to taper down at 5500rpm.
so why does it overboost?
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      11-12-2014, 02:34 AM   #6
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I would datalog it before you begin to worry. That gauge isn't the most accurate measurement, especially in 1st and 2nd gear.
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      11-12-2014, 10:40 AM   #7
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Quote:
Originally Posted by jb4store
I would datalog it before you begin to worry. That gauge isn't the most accurate measurement, especially in 1st and 2nd gear.
+1 definitely datalog it. If indeed it is overboosting then we can suggest the proper actions!
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      11-12-2014, 11:34 AM   #8
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are you backend flashed? 4-3 will pick the higher of the two targets, which could explain the spike. That or some other things (vac lines, etc)
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      11-12-2014, 02:29 PM   #9
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Probably doesn't have the diods cut on the jb4. That causes overboost, if running an iso firmware without the diode cut.
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