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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 > JB+ and FMIC



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      02-08-2010, 10:54 AM   #1
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JB+ and FMIC

I'm thinking about getting the HPF fmic. Anyone running a fmic with JB+? I honestly don't want to stress my turbos with a more agressive tune and in the summer time my car almost feels like an NA due to the lack of power because of heat!
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      02-08-2010, 10:59 AM   #2
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uhh, the point of the intercooler is to make the boost less harsh on the rest of the car by lower the temperature that the extra boost creates.

so the FMIC will only benefit
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      02-08-2010, 11:17 AM   #3
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They work great together. The cooler IAT will also trigger the JB+ to bump up boost slightly for you.

Mike
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      02-08-2010, 11:57 AM   #4
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
They work great together. The cooler IAT will also trigger the JB+ to bump up boost slightly for you.

Mike

Interesting, I would think the JB+ would want to reduce boost, therefore helping the turbos not spin as fast and still maintain a constant amount of power with the FMIC in.
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      02-08-2010, 04:47 PM   #5
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Only good can comefrom this mod. The HPF unit looks really grat as well.
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      02-08-2010, 05:30 PM   #6
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Quote:
Originally Posted by 335xiR View Post
Interesting, I would think the JB+ would want to reduce boost, therefore helping the turbos not spin as fast and still maintain a constant amount of power with the FMIC in.
+1..lower iat, lower amount of boost needed to reach same power level, no?
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      02-08-2010, 05:44 PM   #7
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Quote:
Originally Posted by 335xiR View Post
Interesting, I would think the JB+ would want to reduce boost, therefore helping the turbos not spin as fast and still maintain a constant amount of power with the FMIC in.
The JB+ isn't aware of duty cycle, only air intake temperature. It would see the cooler air intake temperature, decide it was safe to run more boost, and raise it slightly. Nothing major but the JB+ and IC work well together.

Mike
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      02-09-2010, 08:26 AM   #8
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
The JB+ isn't aware of duty cycle, only air intake temperature. It would see the cooler air intake temperature, decide it was safe to run more boost, and raise it slightly. Nothing major but the JB+ and IC work well together.

Mike
Interesting, two points that might help though, if the intake temps are about 30-40* cooler in the winter, it will run even more boost ? When does it know the limit ? If someone runs a JB in 100* weather, then puts and intercooler on and runs it in 45* weather, seems like an equation for something to break . . . since the JB is not aware of duty cycle, it would just run more and more boost until you either A. exhaust your turbos and they fail or B. something fails ? No ?
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      02-09-2010, 09:39 AM   #9
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Quote:
Originally Posted by 335xiR View Post
Interesting, two points that might help though, if the intake temps are about 30-40* cooler in the winter, it will run even more boost ? When does it know the limit ? If someone runs a JB in 100* weather, then puts and intercooler on and runs it in 45* weather, seems like an equation for something to break . . . since the JB is not aware of duty cycle, it would just run more and more boost until you either A. exhaust your turbos and they fail or B. something fails ? No ?
No, the allowable adjustment range is pretty small. Around 1.5psi from 50 degrees F to 160 degrees F.

Mike
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