|
Forced Induction Turbo, Supercharger, Methanol, Nitrous |
|
Thread Tools | Search this Thread |
07-22-2013, 08:52 PM | #1 |
Banned
Join Date: Mar 2013
Drives: 2013 FR-S
Location: Orlando, FL
Posts: 2,929
Thanks: 1,166
Thanked 2,293 Times in 1,180 Posts
Mentioned: 313 Post(s)
Tagged: 4 Thread(s)
|
catch can for blow-through maf
i've been working on getting my pcv system fixed up lately, first fixing a problem with the pcv leaking under boost and now trying to eliminate a vacuum leak.
the problem is that there is nowhere to run the crankcase breather to (the line that would normally run to the intake, not the pcv line running to the intake manifold). with a blowthrough maf, if i place the line before the turbo in the intake tract it's going to be pulling vacuum, but it'll also be pulling in unmetered air at idle/low load. i can't place it after the maf because that would be after the turbo, and would see boost. my current plan is to just cap the intake manifold and run both the pcv and crankcase breather to a vented catch can. that way there is unmetered air in the crankcase, but at least it has no path back into the intake manifold. of course this produces little to no crankcase vacuum which kind of takes the 'positive' out of 'positive crankcase ventilation', but it seems like the best i can do. how is everyone else handling this with a blow-through maf? |
07-23-2013, 07:42 AM | #2 | |
Senior Member
Join Date: Jan 2013
Drives: 2013 Asphalt FR-S
Location: Orange County
Posts: 1,639
Thanks: 632
Thanked 981 Times in 537 Posts
Mentioned: 100 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Your plan would never pull a vacuum on the case (as you mentioned). As an alternative, install a check valve between the manifold and can then tie the two crank case ports to the other side of the can. At least then it is pulling vacuum when off boost and the check valve closes under boost so the crank case would be vented to atmosphere under boost. The best solution is to run two cans in the factory configuretation but with the intake port moved pre turbo / SC. Its a good idea to install a check valve between the manifold and can since the PCV will leak some under boost and was not designed for boosted applications. This way you have a vacume on the case all the time (intake side under boost, manifold side under vacuum).
__________________
~Namaste~ |
|
07-23-2013, 09:37 AM | #3 | |
Banned
Join Date: Mar 2013
Drives: 2013 FR-S
Location: Orlando, FL
Posts: 2,929
Thanks: 1,166
Thanked 2,293 Times in 1,180 Posts
Mentioned: 313 Post(s)
Tagged: 4 Thread(s)
|
Quote:
so then is the idea that if i can get the crank vent tube to somewhere that is always under vacuum (in front of the turbo) it'll not pull in unmetered air? does this hold true at idle when there is very little vacuum in front of the turbo, or will a setup like this cause the same issues at idle/low-load as before? thanks for all your help! this is driving me nuts trying to get it right lol. |
|
07-23-2013, 09:52 AM | #4 | |
I Love custom Turbo kits
Join Date: Mar 2012
Drives: Limited BRZ
Location: Miami
Posts: 10,770
Thanks: 20,004
Thanked 8,343 Times in 4,361 Posts
Mentioned: 441 Post(s)
Tagged: 12 Thread(s)
|
Quote:
__________________
|
|
The Following 2 Users Say Thank You to Sportsguy83 For This Useful Post: | jamesm (07-23-2013), SmsAlSuwaidi (07-23-2013) |
07-23-2013, 01:06 PM | #5 | |
Senior Member
Join Date: Jan 2013
Drives: 2013 Asphalt FR-S
Location: Orange County
Posts: 1,639
Thanks: 632
Thanked 981 Times in 537 Posts
Mentioned: 100 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Sounds like a good reason not to do blow through to me... but i'm sure it's too late to change that for your setup.. I'll have to think about this one... If you just seal off the intake side crank case vent you won't ever be able to pull fresh air into the crank case to circulate through (hence the "vent" portion of pcv). hmmm... off to the interwebs to search... biab
__________________
~Namaste~ |
|
07-23-2013, 01:27 PM | #6 |
Senior Member
Join Date: Jan 2013
Drives: 2013 Asphalt FR-S
Location: Orange County
Posts: 1,639
Thanks: 632
Thanked 981 Times in 537 Posts
Mentioned: 100 Post(s)
Tagged: 0 Thread(s)
|
OK, so this is a common issue with blow-through. A few solutions to choose from if you have to run blow-through :
1. Cap the port at the manifold and T both crank vents together to your AOS / Catch can inlet and run a single outlet to the pre turbo intake tube, this should always pull a vacuum on the case, but will not provide a source of fresh air circulation. 2. Vent both ports to atmosphere... downside is will never pull a vacuum on the case 3. Run a dual can setup like factory (intake side port pre turbo). Down side is you will want to re scale the maf to account for the vacuum leak when manifold pressure is less than atmospheric. I would probably try #1 first and see what it catches in the can. I might try #3 but I don't have to rely on a tuner to re-scale my maf for me since i use BRZedit.
__________________
~Namaste~ |
The Following User Says Thank You to mad_sb For This Useful Post: | jamesm (07-23-2013) |
07-23-2013, 01:28 PM | #7 |
Senior Member
Join Date: Jan 2013
Drives: 2013 Asphalt FR-S
Location: Orange County
Posts: 1,639
Thanks: 632
Thanked 981 Times in 537 Posts
Mentioned: 100 Post(s)
Tagged: 0 Thread(s)
|
derp, double post
__________________
~Namaste~ |
07-23-2013, 01:54 PM | #8 |
Banned
Join Date: Mar 2013
Drives: 2013 FR-S
Location: Orlando, FL
Posts: 2,929
Thanks: 1,166
Thanked 2,293 Times in 1,180 Posts
Mentioned: 313 Post(s)
Tagged: 4 Thread(s)
|
I think I'm going to go with option 2 (similar to the d3pe can setup) venting both to atmosphere and capping the manifold. That will keep 100% of the hot nasty air out of the intake charge. I can add a real vacuum pump setup later if I see something that requires it (oil leak, etc).
Thanks for the help! |
07-23-2013, 02:27 PM | #9 | |
I Love custom Turbo kits
Join Date: Mar 2012
Drives: Limited BRZ
Location: Miami
Posts: 10,770
Thanks: 20,004
Thanked 8,343 Times in 4,361 Posts
Mentioned: 441 Post(s)
Tagged: 12 Thread(s)
|
Quote:
__________________
|
|
The Following User Says Thank You to Sportsguy83 For This Useful Post: | jamesm (07-23-2013) |
07-23-2013, 02:59 PM | #10 |
Banned
Join Date: Feb 2013
Drives: FRS
Location: florida
Posts: 1,478
Thanks: 736
Thanked 570 Times in 434 Posts
Mentioned: 110 Post(s)
Tagged: 1 Thread(s)
|
i just put a mini filter on it lol
|
07-24-2013, 01:16 PM | #11 | |
NASA SpecE30 Racer
|
Quote:
__________________
- King Tut
Street/Track Car: 2006 Honda S2000 TT3 || Race Car: 1987 BMW 325is SpecE30 || Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 || 2013 Subaru BRZ || 2012 Porsche Cayman R || 2009 Chevrolet Z06 || 2009 BMW M3 || 2004 BMW M3 || 2004 Nissan 350Z |
|
07-24-2013, 02:27 PM | #12 |
Banned
Join Date: Mar 2013
Drives: 2013 FR-S
Location: Orlando, FL
Posts: 2,929
Thanks: 1,166
Thanked 2,293 Times in 1,180 Posts
Mentioned: 313 Post(s)
Tagged: 4 Thread(s)
|
Yeah I want absolutely zero blow by going back into my intake tract. Only one way to accomplish that. I don't trust any can to remove all of it.
|
05-25-2017, 07:18 AM | #13 | |
Senior Member
Join Date: Feb 2013
Drives: RHD Gt86
Location: Antigua, west indies
Posts: 365
Thanks: 614
Thanked 101 Times in 74 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I have a issue with my car running low vacuum (.48-.52bar) and high STFT's at IDLE. I have in the radium dual catch can set up with both of them vented to atmosphere, I noticed you said if they are vented to atmosphere I have to have my maf rescaled. I've just done a complete build and have not driven the car as yet as I'm doing remote tuning with delicious P.s I noticed @mad_sb hasn't been active since last year, hoping someone else can help me
__________________
Toyota - Making Dreams A Reality
461hp on 91octane - JDL turbo GTX3076r GEN 2 - Mazworx CD009 transmission |
|
05-25-2017, 10:54 AM | #14 |
Senior Member
Join Date: May 2014
Drives: 2013 Asphalt FRS
Location: San Antonio
Posts: 994
Thanks: 693
Thanked 695 Times in 417 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
|
just put a one way check valve in the line
__________________
Instagram FT86PROJECT9S
Facebook FT86PROJECT9S 710whp |
The Following User Says Thank You to FRS Justin For This Useful Post: | Kris86 (05-25-2017) |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Does you A/C blow cold? | boredom.is.me | Issues | Warranty | Recalls / TSB | 45 | 07-29-2017 03:04 PM |
How Blow Off Valves Work | ATSAaron | Forced Induction | 47 | 07-16-2014 06:38 PM |
Tial Q Blow off valve | Gen | Engine, Exhaust, Bolt-Ons | 1 | 11-01-2013 08:34 PM |
Get your Kicks Now! JULY wheels blow out sale. | vividracing | Wheels and Tires | 13 | 09-19-2013 12:58 AM |
***CUSCO COILOVERS BLOW OUT PRICING*** | genometuning | Brakes, Suspension, Chassis | 11 | 10-23-2012 05:54 PM |