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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 > I honestly dont know if i have a boost leak



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      05-25-2011, 07:47 PM   #1
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I honestly dont know if i have a boost leak

I had downpipes as well as a new fmic installed just last week first off. Now between all of the air flow sound made by an aspirated motor with high flow parts im a bit thrown off. Lol so bare with me. Its not the sound of the DCI's thats the suck and release sound, used to that. Then there's the slight slight whistle of the turbos spoiling now since the dp's, but one more loud sound that i dont think i should be hearing. A loud blowin hiss when i Hit boost. honestly, closest thing i can match it to is lol, paper tearing loud almost, or the pssst pssst sound people often use to call a cat.. idk thats just best i can describe it. maybe ive lost some torque on WOT too. besides the slight turbo spool sound and the suck and blow of the intakes, should i be hearing this loud heavy blowing sound when boosting??? as far as i knoe i really shouldnt. thanks
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      05-25-2011, 07:49 PM   #2
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Check your FMIC connections.
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      05-25-2011, 08:09 PM   #3
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Downpipes do make the turbo spool much more noticeable. I heard the same thing, after I installed mine, so I would say its normal. Still check you intercooler connections to be sure they are tight, but I think the sound is normal. Are you hitting your target boost?
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      05-25-2011, 08:15 PM   #4
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thanks guys. ill go try setting my fuel gauge to psi and see if i hit peak boost.
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      05-25-2011, 08:16 PM   #5
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and its not the turbo spooling that im hearing. this is like loud blow off air loud..
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      05-25-2011, 08:37 PM   #6
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I hear that as well but its only very apparent with the windows down, radio off, and when there is a wall, trees, or something to reflect the sound from the passenger side. Checking your boost will be the first step. If you are hitting boost but you still believe there is a leak, you could log wastegate DC. That would tell if your turbos are boosting higher to compensate for the leak. I don't really know what to look for though with the wastegates, so maybe someone with a little more experience with that could chime in and help.
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      05-25-2011, 08:53 PM   #7
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Deja Vu. I did the same thing! Installed intercooler and downpipes around the same time frame. Just to give you some tips, the V-band clamp connecting the turbo and DP together tends to get loose after you first install it. It happened to me. Since you already have a boost gauge you'll know if there's a boost leak or not. If there's a drop in boost then you'll have to play around with your IC hoses and clamps.
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      05-25-2011, 09:09 PM   #8
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when I got my catless dps, fmic and dci - I was surprised at the additional sounds... I took it back to check for leaks too... more exhaust sound when cold though...

now, I love the sound. It sounds like power !!
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      05-25-2011, 09:40 PM   #9
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just took the car out. spiking at just barely 15psi. i have that map set to peak boost of 16.5 psi. is that about right. or should i be seeing dead on 16.5 on that fuel gauge. keep in mind this is through the v5 software using my fuel gauge as psi. idk how accurate thats supposed to be but 'technically' im 1.5-2psi short.... good or no good
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      05-26-2011, 06:47 AM   #10
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Quote:
Originally Posted by plague View Post
just took the car out. spiking at just barely 15psi. i have that map set to peak boost of 16.5 psi. is that about right. or should i be seeing dead on 16.5 on that fuel gauge. keep in mind this is through the v5 software using my fuel gauge as psi. idk how accurate thats supposed to be but 'technically' im 1.5-2psi short.... good or no good
First, what firmware on the Procede are you running? By peak boost do you mean Max Boost, or Start Boost? Those numbers mean very different things. Second, if you are running 16.5 psi, I would stop trying it. Without meth or race gas, you shouldn't be running that high.
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      05-26-2011, 07:21 AM   #11
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Quote:
Originally Posted by jdbretz View Post
First, what firmware on the Procede are you running? By peak boost do you mean Max Boost, or Start Boost? Those numbers mean very different things. Second, if you are running 16.5 psi, I would stop trying it. Without meth or race gas, you shouldn't be running that high.
3-30 maps. Start boost @ 50%, Max Boost @ 16.5. Robert from vishnu said with all the high flow parts, they believe 16.5 is fine. Ill be installing meth as soon as they get their batches done. So tell me, hitting 15 TOPS on the fuel gauge as boost gauge, am i g2g? thanks
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      05-26-2011, 08:10 AM   #12
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I also hit 14.5-15 psi on my fuel gauge and with 11-25 maps (autotuning) max boosT 15 start boost 30% Aka 13 psi ic 100 before was using max boost 16 start boost 34.902 start ign 50.1961 (default by vishnu)
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      05-26-2011, 08:52 AM   #13
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Quote:
Originally Posted by plague View Post
3-30 maps. Start boost @ 50%, Max Boost @ 16.5. Robert from vishnu said with all the high flow parts, they believe 16.5 is fine. Ill be installing meth as soon as they get their batches done. So tell me, hitting 15 TOPS on the fuel gauge as boost gauge, am i g2g? thanks
I thought the same thing.... we just discussed this "issue" on the 5-10 map thread.

Read page 17:

http://www.e90post.com/forums/showth...529006&page=17
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      05-26-2011, 09:48 AM   #14
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soo with my Max boost @ 16.5 psi and my gauge spiking no higher than 15.. thats normal?
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      05-26-2011, 09:51 AM   #15
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Quote:
Originally Posted by plague View Post
soo with my Max boost @ 16.5 psi and my gauge spiking no higher than 15.. thats normal?
read the thread... you have to set MAX higher than the START BOOST and the START BOOST is the max boost you are going to get. Try it, I have to do that today too.
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      05-26-2011, 10:12 AM   #16
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Quote:
Originally Posted by DaFish View Post
read the thread... you have to set MAX higher than the START BOOST and the START BOOST is the max boost you are going to get. Try it, I have to do that today too.
OOHhh lol. so with my start boost at 50% and max boost at 16.5 im really only gonna hit 15psi tops. thus explaining why im only hitting 15 on mu boost gauge. so. ill set start at 65% (16.5) and Max at lets say 17.5. sound okay? DaFish, thank you. that answers what i needed..
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      05-26-2011, 11:19 AM   #17
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Quote:
Originally Posted by plague View Post
OOHhh lol. so with my start boost at 50% and max boost at 16.5 im really only gonna hit 15psi tops. thus explaining why im only hitting 15 on mu boost gauge. so. ill set start at 65% (16.5) and Max at lets say 17.5. sound okay? DaFish, thank you. that answers what i needed..
That is correct. Before you go cranking up your boost, have you done a log at 15 psi yet? If not, you NEED to do that first to confirm your car will respond well to more boost. You cannot rely on how it feels driving it to know for sure everything is fine. DO NOT just jump from 15 to 16.5 to try it out. Slowly increase in 0.5 psi increments until you start getting timing pulled. Then I would back off 0.5 psi to leave room for variations in ambient temp etc. If you are not sure what to look for with the log, then post it and get feedback from others, or just wait until autotuning comes back out. Do not go blindly increasing boost without first understanding all the factors that doing so involves.
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      05-26-2011, 11:47 AM   #18
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Quote:
Originally Posted by jdbretz View Post
That is correct. Before you go cranking up your boost, have you done a log at 15 psi yet? If not, you NEED to do that first to confirm your car will respond well to more boost. You cannot rely on how it feels driving it to know for sure everything is fine. DO NOT just jump from 15 to 16.5 to try it out. Slowly increase in 0.5 psi increments until you start getting timing pulled. Then I would back off 0.5 psi to leave room for variations in ambient temp etc. If you are not sure what to look for with the log, then post it and get feedback from others, or just wait until autotuning comes back out. Do not go blindly increasing boost without first understanding all the factors that doing so involves.
then again, im still running 3-30 maps as stated above. that thread is pertaining to the newest maps. i could enable autotuning on 3-30 maps and leave max at 16.5 and start at 50% in that case.
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      05-26-2011, 12:01 PM   #19
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Quote:
Originally Posted by plague View Post
then again, im still running 3-30 maps as stated above. that thread is pertaining to the newest maps. i could enable autotuning on 3-30 maps and leave max at 16.5 and start at 50% in that case.
Everything in that thread (minus the autotuning part specific to the 5-10 maps) and this pertains to the beta maps whether its 3-15, 3-30, 5-10, etc. The reason being is all of these maps DO NOT have autotuning enable for boost/timing. 5-10 only has autotuning for the aggression level. This is taken directly from the 3-30 readme:

Quote:
As with previous beta DIC maps, Autotuning and Procede traction/launch control are current disabled for the time being.
Autotuning will not work and should not be turned on. If you are not comfortable doing logs, then I highly recommend running the beta maps at their default settings until autotuning is re-enable. Its better to run a little on the conservative side for the time being then run overly aggressive.

Last edited by jdbretz; 05-26-2011 at 12:36 PM..
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      05-26-2011, 12:04 PM   #20
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Quote:
Originally Posted by plague View Post
3-30 maps. Start boost @ 50%, Max Boost @ 16.5. Robert from vishnu said with all the high flow parts, they believe 16.5 is fine. Ill be installing meth as soon as they get their batches done. So tell me, hitting 15 TOPS on the fuel gauge as boost gauge, am i g2g? thanks
Autotune is off, so if your start boost is 50%, then you will only se about 15 PSI.

Sounds like those sounds are normal.

Make sure you go over the instructions of all beta maps there is important information in there regarding which aspects of the tunes are disable and enabled and any little quirks.

I recommend upgrading to the 5-10 maps. 5-10 has auotune ON (as read only) so it still wont make adjustments.

It wont be for the next couple updates when autotune will be fully enabled again.
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      05-26-2011, 12:09 PM   #21
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thats right autotune is disabled still on the 3-30 DIC maps as well. alright thanks
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      05-26-2011, 08:50 PM   #22
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Separate issue, I'm only boosting 8-9 psi, tried switching maps and no change.

What are other areas to check when boost is low (besides intercooler and charge pipe connections)?

I know boost will be lower at high rpm because of the elevation in Denver, but I'd usually see 14-15psi from 3-5K rpm on the fuel boost gauge in the past.
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