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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 > Source for Vacuum/Boost



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      07-06-2007, 09:29 PM   #1
scalbert
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Source for Vacuum/Boost

Just trying to save myself some hit-n-miss time. For those who have installed a boost gauge where did you find to be the easiest location to tap for a source which sees both vacuum and boost?

TIA
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      07-06-2007, 11:21 PM   #2
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the vacumm lines that go to the bov is a good easy accessible spot.
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      07-07-2007, 10:37 AM   #3
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now you tell us where your going to route your vacuum line
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      07-07-2007, 08:29 PM   #4
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Originally Posted by 533ogetnom View Post
now you tell us where your going to route your vacuum line
Good question. I was browsing the engine bay and saw nothing. I'm gonna pull the driver's side under dash shroud soon and see if anything becomes more visible. The passenger's side firewall look to be covered by the fuse box and HVAC pieces.

Anyway, I'll track a reliable source and document the correct tee fitting and hose size.

FYI, for anyone who wants to know; the gauge is going in the glove box. It will be angled at me and use the glove box light for illumination (only on when the glove box is open). I have the gauge but the pod was just ordered today and should be in mid-week.
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      07-07-2007, 09:24 PM   #5
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Yes, you can tap the vac line that goes to to "Y" at the diverter valves. As far as running the vac line back into the car you can go through the driver's side firewall. Once you remove the plastic panel that is under the dash in the driver's side foot well you will see where there is a wire loom that is going through the firewall. You can snake a vac line through there and it will end up under the right plastic cover in the engine bay where the brake reservoir/master cylinder is located. Its pretty straight forward once you remove a few panels.
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      07-08-2007, 08:53 AM   #6
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Originally Posted by BoostedBMW View Post
Yes, you can tap the vac line that goes to to "Y" at the diverter valves. As far as running the vac line back into the car you can go through the driver's side firewall. Once you remove the plastic panel that is under the dash in the driver's side foot well you will see where there is a wire loom that is going through the firewall. You can snake a vac line through there and it will end up under the right plastic cover in the engine bay where the brake reservoir/master cylinder is located. Its pretty straight forward once you remove a few panels.
Thanks!!! That was what I was suspecting but it is good to hear from someone who has already taken that route.
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      07-08-2007, 09:16 AM   #7
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Quote:
Originally Posted by scalbert View Post
Thanks!!! That was what I was suspecting but it is good to hear from someone who has already taken that route.
No problem. Also, you can check out this link to a DIY that hyperM3 made. He had a very good idea for putting in a "T" for a vac line where you can revert it back to stock without having to replace anything... http://www.e90post.com/forums/showth...oost+gauge+diy
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      07-08-2007, 03:54 PM   #8
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Hi

I did the first step of a Boost Gauge installation today, used this source and routed the hose into the cabin. There I connected a new, cheap mechanical gauge for test purposes and have been very surprised about the result:

Car is off: 0 bar ( 0psi )
Car idling: -0.6 bar ( minus 8.5psi )
Car rolls downhill, throttle closed = -0.9 bar ( minus 13psi )
Car is cruising: -0.2 to -0.6 bar ( minus 3.0psi - minus 8.5psi )
Accelerating: up to +0.9 bar ( plus 13psi )

So to my question: Are these readings normal for a Boost gauge and do we have the correct vacuum / boost source ?



Thank you for feedback.

Cheers
Eugen

BTW, this works great :

Quote:
Originally Posted by BoostedBMW View Post
... As far as running the vac line back into the car you can go through the driver's side firewall. Once you remove the plastic panel that is under the dash in the driver's side foot well you will see where there is a wire loom that is going through the firewall. You can snake a vac line through there and it will end up under the right plastic cover in the engine bay where the brake reservoir/master cylinder is located. Its pretty straight forward once you remove a few panels.
In addition, start from the cabin side to route the hose .
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Last edited by e.n335; 07-08-2007 at 04:43 PM.
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      07-08-2007, 07:13 PM   #9
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Quote:
Originally Posted by eugen.niederreiter View Post
Hi

I did the first step of a Boost Gauge installation today, used this source and routed the hose into the cabin. There I connected a new, cheap mechanical gauge for test purposes and have been very surprised about the result:

Car is off: 0 bar ( 0psi )
Car idling: -0.6 bar ( minus 8.5psi )
Car rolls downhill, throttle closed = -0.9 bar ( minus 13psi )
Car is cruising: -0.2 to -0.6 bar ( minus 3.0psi - minus 8.5psi )
Accelerating: up to +0.9 bar ( plus 13psi )

So to my question: Are these readings normal for a Boost gauge and do we have the correct vacuum / boost source ?

Obvioussly I will need to confirm the numbers when I install the gauge by mid-week (when the pod arrives). But looking them over and comnparing to other cars they look mostly fine. Below are my comments.

Car is off: 0 bar ( 0psi ) *Obviously correct

Car idling: -0.6 bar ( minus 8.5psi ) *Was this warmed up fully? This equates to about 17 inHG vacuum which is a little low on a warmed engine (but not 100% sure on this vehicle yet). fully wamred I would expect on most vehicles to be closer to 20 inHG vacuum (about -10 PSI).

Car rolls downhill, throttle closed = -0.9 bar ( minus 13psi ) *Sounds about dead on, about 26 inHG vacuum.

Car is cruising: -0.2 to -0.6 bar ( minus 3.0psi - minus 8.5psi ) *Excellent vacuum here and what I would expect for good fuel economy.

Accelerating: up to +0.9 bar ( plus 13psi ) *Must have a PROcede.
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      07-08-2007, 07:14 PM   #10
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Quote:
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In addition, start from the cabin side to route the hose .
Precisely where I was going to start from. Thanks...
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      07-08-2007, 09:24 PM   #11
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Quote:
Originally Posted by eugen.niederreiter View Post
Car is off: 0 bar ( 0psi )
Car idling: -0.6 bar ( minus 8.5psi )
Car rolls downhill, throttle closed = -0.9 bar ( minus 13psi )
Car is cruising: -0.2 to -0.6 bar ( minus 3.0psi - minus 8.5psi )
Accelerating: up to +0.9 bar ( plus 13psi )

So to my question: Are these readings normal for a Boost gauge and do we have the correct vacuum / boost source ?
You have PROcede correct? If so then you are getting good readings. The highest Ive seen with my digital gauge is 13.7 and the lowest is around -12. Basically the same cruising pressure as you.
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      07-09-2007, 12:41 AM   #12
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Thank you for all your feedback. The readings I posted are not that accurate, the current gauge is not digital. It's good to know that this source is fine. I will come up with more accurate numbers when the installation is done. Yes, I have a PROcede.

Cheers
Eugen
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