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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > MHD stage 2 low target boost?



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      05-23-2020, 07:08 AM   #1
joaozinho_7
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MHD stage 2 low target boost?

Hi peeps,

Basically, after taking some logs out, my car seems to have low target boosts from 2500 to redline. Sometimes is slightly below 14 psi, sometimes is around 14.7 psi. Shouldn't I be getting a bit more than 14.7 psi?Also, during peak boost, the car overboosts a little, however, it doesn't even get close to the target boost around 2600 rpm. I also can see some throttle closure during peak boost, which is rectfied, once boost decreases. The car is an E92 from 2011 with 7 speed dual-clutch transmission and it has 74k miles. It also has the following mods:

-VRSF charge pipe

- BMS air filter intake

-Catless downpipe

- MHD stage 2 98RON (99 RON Shell-V power)

The log is attached as a .jpg file, I couldn't share the URL for some reason. 3rd gear pull @2500 rpm to redline with DTC off in sport mode.

Thanks in advance
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      05-23-2020, 09:45 AM   #2
Falko123
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I used to run stage 2 plus and the highest I saw was around 1.2 bar so roughly 17 psi. So sounds about right what you have.
But your mods miss an intercooler.
How about your iat? There is a limiter in the ECU for IAT.
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      05-23-2020, 03:30 PM   #3
joaozinho_7
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The intercooler is on its way. VRSF 5" stepped HD. After that, the car will be FBO, and I might switch to stage 2+. IAT goes from 22C to 41C during the pull. It reaches 52C after the pull. Today, I flashed the car with stage 2+, and when I first did a pull in 3rd gear, the car went into limp mode, misfiring. Had to switch back to stage 2.
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      05-26-2020, 09:40 AM   #4
Falko123
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why the limp mode? I've only seen limp for underboost. which was a leak.
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