do I have a leak in my turbo vacuum lines?

Gtech · 05-28-2017, 02:38 AM

Hi, im pretty new here. I recently bought a 2007 E90 335i

Im pretty happy with it, only a few 'little' things have to be solved like the famous wastegate rattle (already bought a repair kit from ebay) also when going full throttle it feels like little misfires on low RPM but really minimal and a oil leak..i think it's the oil pan or the rear crank seal.

Car has Mosselman stage 2 (chip and intercooler) and a BMW performance exhaust. For the rest the engine is stock.

Alright my question, with my old 2JZ-GTE the twin turbo actuators are controlled with boost pressure. Also when the engine is turned of you still have a buffer of boost pressure in the boost tank.

Now i noticed the N54 is using vacuum to control the wastegates. Now I was checking some things on the engine but i noticed that when i pull a vacuum line from the vacuum tanks when the engine isn't running I didn't hear any air escaping. Can anyone confirm this is normal? I don't have fault codes but I'm just wondering.

Thanks,

Chris@VargasTurboTech · 05-28-2017, 03:52 PM

If the engine has been off for a bit, it's normal. If you have the car running, turn if off, and immediately go pull a line attached to the vacuum pump you'll hear the hiss of air entering the system. If you're reaching target boost you're probably fine, or the leaks are slow.

Chris

05-28-2017, 02:38 AM	#1
Gtech New Member 2 Rep 6 Posts Drives: 335i Join Date: May 2017 Location: Netherlands iTrader: (0)	do I have a leak in my turbo vacuum lines? Hi, im pretty new here. I recently bought a 2007 E90 335i Im pretty happy with it, only a few 'little' things have to be solved like the famous wastegate rattle (already bought a repair kit from ebay) also when going full throttle it feels like little misfires on low RPM but really minimal and a oil leak..i think it's the oil pan or the rear crank seal. Car has Mosselman stage 2 (chip and intercooler) and a BMW performance exhaust. For the rest the engine is stock. Alright my question, with my old 2JZ-GTE the twin turbo actuators are controlled with boost pressure. Also when the engine is turned of you still have a buffer of boost pressure in the boost tank. Now i noticed the N54 is using vacuum to control the wastegates. Now I was checking some things on the engine but i noticed that when i pull a vacuum line from the vacuum tanks when the engine isn't running I didn't hear any air escaping. Can anyone confirm this is normal? I don't have fault codes but I'm just wondering. Thanks, Attached Images
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05-28-2017, 03:52 PM	#2
Chris@VargasTurboTech Lieutenant Colonel 1935 Rep 1,532 Posts Drives: All Things TurboCharged Join Date: May 2016 Location: Bay Area iTrader: (0)	If the engine has been off for a bit, it's normal. If you have the car running, turn if off, and immediately go pull a line attached to the vacuum pump you'll hear the hiss of air entering the system. If you're reaching target boost you're probably fine, or the leaks are slow. Chris
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