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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 > G5 FBO+Meth



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      06-27-2012, 06:38 AM   #1
triggz
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G5 FBO+Meth

So I was having issues with my G4 15ohm board. I was maxing out my turbos on a 40 additive and I wasn't hitting target very well. My ffmax was around the 120 mark. Now with the G5 I'm very consistent with target. Boosting higher than before and my ffmax/pwm is much lower than before.
The car is very smooth and pulls really well.

When it was first adapting, I was hitting 18+ psi with no timing drops, excellent fuel pressure, and max 50 on the pwm.

50/50 meth, CM10, 94 Oct, fbo, 40 additive
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      06-27-2012, 07:05 AM   #2
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Pretty cool that the board change fixed your problems. Logs looks healthy, especially that timing curve (looks similar to mine but I'm still on the older G4 board)
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      06-27-2012, 10:59 AM   #3
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must feel good to have that sorted out. mine should be here tomorrow.

mostly just wanted something to play around with + speed delimiter, but maybe i'll squeeze a few more hp out of my 70 additive

besides, i still have a feeling they're eventually going to toy with cps and everyone will either have to upgrade or get the separate module.
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      06-27-2012, 03:05 PM   #4
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Quote:
Originally Posted by triggz View Post
So I was having issues with my G4 15ohm board. I was maxing out my turbos on a 40 additive and I wasn't hitting target very well. My ffmax was around the 120 mark. Now with the G5 I'm very consistent with target. Boosting higher than before and my ffmax/pwm is much lower than before.
The car is very smooth and pulls really well.

When it was first adapting, I was hitting 18+ psi with no timing drops, excellent fuel pressure, and max 50 on the pwm.

50/50 meth, CM10, 94 Oct, fbo, 40 additive
With the G5 boost control is isolated and not run through the load resistors the G4 uses. So PWM = 100% is actually a fully open solenoid. I think the latest G5 BETA firmware has duty cycle under load capped at around 80%. What would be say a 100% PWM on a 15ohm board is maybe 40% PWM on the G5. Keep that in mind when doing comparisons. On the G5 70% PWM to hit 14ps at 6500rpm is fairly high but ignition looks fine so I would guess its likely just a wastegate adjustment issue you can ignore.

Mike
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