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Default Our vacuum canister is needed? - 03-01-2016, 12:14 PM

Our vacuum canister is needed?
While performing maintenance changing the starter installing inlet's valve cleaning and other odds n ends.
I'm not quite finished yet but I wanted to see if the car would start up to make sure I had everything plugged in properly. The car started right up on the first push of the button but my vacuum canisters are not mounted back in the car yet, So that made me wonder are they even needed?
It's not going to be hard to remount them in a new location but i was just curious if anyone has done away with them.
Thanks,
R


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Default 03-01-2016, 12:15 PM

They are used to control the vacuum operated wastegates under engine boost.


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Default 03-01-2016, 12:22 PM

Ok thanks


JB4-G5 ISO w/fsb..
ER charge pipe..
BMS E85 back end flash..
Forged DV's..
5" ETS FMIC..
Gutted Stock DP's..
No sec cats..
Custom MMP inlets...
BMS Trunk Mount Meth Kit SS lines 2 nozzles CM10&7..
Walbro 255 inline The SteveAZ edition
M6 Reps, Custome Tips, Lux Angel Eyes 4..
All Wrapped in a Sparkling Graphite E92.....
ET 11.910@117.29***60' 1.851***
Full weight On 19" street tires..
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Default 03-01-2016, 12:25 PM

Lol, no vacuum canisters = no turbo functions.


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ferocity02 ferocity02 is offline
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Default 03-01-2016, 12:47 PM

He does bring up a good point... The vacuum canisters are just an empty can as far as I know. What is the point of having them inline between the vacuum pump and boost solenoids? Do they act like a buffer, absorbing small fluctuations in vacuum? That is my best guess.


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Default 03-01-2016, 12:53 PM

I deleted them on my car, no appreciable difference in how it drove afterwards. Line is now run directly from the vac pump line tee to the wg solenoids, cleaned up the engine bay a bit.


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Default 03-01-2016, 02:23 PM

Quote:
Originally Posted by ferocity02
He does bring up a good point... The vacuum canisters are just an empty can as far as I know. What is the point of having them inline between the vacuum pump and boost solenoids? Do they act like a buffer, absorbing small fluctuations in vacuum? That is my best guess.
Quote:
Originally Posted by Snertz
I deleted them on my car, no appreciable difference in how it drove afterwards. Line is now run directly from the vac pump line tee to the wg solenoids, cleaned up the engine bay a bit.
I didn't think of it this way. I thought he meant he could just remove the lines or leave them unattended.

Now I'm curious because I'm installing passenger side inlets and have to re-located them. If I just bypassed them and ran a straight vacuum line, would it hurt performance? What kind of magic happens inside of the canister?


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Default 03-01-2016, 04:24 PM

Quote:
Originally Posted by suspenceful
I didn't think of it this way. I thought he meant he could just remove the lines or leave them unattended.

Now I'm curious because I'm installing passenger side inlets and have to re-located them. If I just bypassed them and ran a straight vacuum line, would it hurt performance? What kind of magic happens inside of the canister?
No not unattended.....running the line straight without the vac canister in-line deleting them but still using the vacuum lines is what I meant
R


JB4-G5 ISO w/fsb..
ER charge pipe..
BMS E85 back end flash..
Forged DV's..
5" ETS FMIC..
Gutted Stock DP's..
No sec cats..
Custom MMP inlets...
BMS Trunk Mount Meth Kit SS lines 2 nozzles CM10&7..
Walbro 255 inline The SteveAZ edition
M6 Reps, Custome Tips, Lux Angel Eyes 4..
All Wrapped in a Sparkling Graphite E92.....
ET 11.910@117.29***60' 1.851***
Full weight On 19" street tires..
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Default 03-01-2016, 04:42 PM

Quote:
Originally Posted by Snertz
I deleted them on my car, no appreciable difference in how it drove afterwards. Line is now run directly from the vac pump line tee to the wg solenoids, cleaned up the engine bay a bit.
The vacuum coming off the pump is not fully regulated so will fluctuate. Without a canister inline the vacuum pull on the WGs can also fluctuate. I'm sure it would work but won't be an ideal situation IMHO.


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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TwistedTuning TwistedTuning is offline
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Default 03-01-2016, 05:04 PM

Quote:
Originally Posted by Snertz
I deleted them on my car, no appreciable difference in how it drove afterwards. Line is now run directly from the vac pump line tee to the wg solenoids, cleaned up the engine bay a bit.
i was just going to post that i know someone local to me that has been without them for a long while. with no ill effects. and you posted, lol.


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ferocity02 ferocity02 is offline
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Default 03-01-2016, 05:10 PM

I would keep them, they likely produce a more "stable" vacuum source to the boost solenoids so the DME has an easier time targeting boost.

You could relocate them down low somewhere, behind the bumper. Perhaps you could even make your own, single canister with the same volume as the two stock canisters. It could be from some cheap PVC pipe with two lines in and two lines out.


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J. Dub J. Dub is offline
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Default 05-15-2016, 01:03 AM

Bump, I want to talk more about removing them as I'd like to remove mine as well.
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iminhell1 iminhell1 is offline
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Default 05-15-2016, 02:10 AM

It'd be interesting if someone could log Vac Pump DC with and W/O the canisters.
That would answer this question ... instead of speculating.


AFAIK, a canister is generally a reserve that would lower the DC of the pump, which would be the primary function. A reduction of fluctuations may be a secondary function.


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TwistedTuning TwistedTuning is offline
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Default 05-15-2016, 03:09 AM

been without mine for a couple months now. no issues. and no signs of increased wgdc. I personally have no way of checking vac pump tho.


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J. Dub J. Dub is offline
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Default 05-19-2016, 02:29 PM

Quote:
Originally Posted by TwistedTuning
been without mine for a couple months now. no issues. and no signs of increased wgdc. I personally have no way of checking vac pump tho.
Interesting. I am really curious why we even have these from the factory at all?
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Default 05-19-2016, 02:39 PM

Quote:
Originally Posted by J. Dub
Interesting. I am really curious why we even have these from the factory at all?
same reason cars have a lot of other things that aren't really needed. over engineering.


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ferocity02 ferocity02 is offline
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Default 05-19-2016, 02:55 PM

Quote:
Originally Posted by J. Dub
Interesting. I am really curious why we even have these from the factory at all?
Obviously they serve some sort of purpose. Best to figure this out before removing them. Or why not just relocate them somewhere down low behind the bumper? Or make your own single cannister from PVC pipe with the same internal volume as both stock cannisters.


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makeuwunder makeuwunder is offline
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Default 05-19-2016, 04:13 PM

Just use one with a tee to the solenoids. Easier to hide one.
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J. Dub J. Dub is offline
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Default 05-23-2016, 11:54 AM

Well I've removed mine and I haven't felt any ill effects.
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Default 05-23-2016, 12:03 PM

Mine were relocated behind the engine when the inlets were installed.
They're just hanging there next to the firewall.
They were not any problem until I swapped my TBI for Port Injection.
They were kind of in the way of the fuel line going to the rail, so I relocated one near the brake booster.



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Default 05-24-2016, 06:03 AM

I deleted mine last September and never looked back. Never had an issue with hold boost rock solid.
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J. Dub J. Dub is offline
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Default 05-24-2016, 07:04 AM

Quote:
Originally Posted by Jt0407
I deleted mine last September and never looked back. Never had an issue with hold boost rock solid.
Agreed. I love not having mine
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Default 05-24-2016, 07:09 AM

I'd be amazed if BMW included a part that's unnecessary but hey they put turn lights on our cars as well and you know the saying about those


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Jt0407 Jt0407 is offline
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Default 05-24-2016, 07:52 AM

I've always been one to do my own personal testing and not go by what the Internet says can, or can not be done.
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ryanm8 ryanm8 is offline
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Default 05-24-2016, 09:30 AM

BMW had to put them there for a reason... Especially with how cheap they have been getting with everything.
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