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Registered
Join Date: Nov 2012
Location: Australia
Posts: 282
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Twin turbo blow of valve
Hi all nearly finishing putting this engine back together and my question is.. do you need to run a blow of valve on the intake pipes from each turbo or can I use just one on the plenum. I am using individual throttle bodies with a U shaped plenum around the flat fan setup...
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05-23-2017, 01:59 AM
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E-85 sippin drunk
Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,554
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A blow off valve is there to let the build up of boost pressure out, when the throttle is closed. The purpose is to prevent the back up of that pressure, which will cause damage to the compressor wheel. As such, it does not matter where you put it, as long as it functions. I have been told to attempt to (in a perfect world) locate it as close to the compressor outlet as possible. But, put it where you have the space.
If you have completely separate I/C's, plenums, etc... then yes, you will need two of them. If both of the compressors discharge into a common plenum, then one will do.
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk |
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05-23-2017, 04:45 AM
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Registered
Join Date: Nov 2012
Location: Australia
Posts: 282
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Twin turbo blow of valve
Thanks for the input so I will run 2 blow of valves one on each intercooler pipe just before the plenum.... Any recommendations on types or brands...
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05-23-2017, 09:55 PM
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Registered
Join Date: May 2005
Location: Loxahatchee, florida
Posts: 2,894
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mine are turbo smart bov's and also wastegates.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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05-24-2017, 05:08 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Best to put the BOV's right after the compressor outlet to aid boost recovery.
If you dump right before ITB's, all the pressure has to be refilled from compressor to ITB's taking much longer recovery. |
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05-24-2017, 05:33 AM
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E-85 sippin drunk
Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,554
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I have both TiAL wastegates, and their BOV. They do make a good quality product, but their customer service SUCKS!!!! Based on that fact alone, I will NEVER own one of their products again.
I have heard good things about Turbosmart.
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk |
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05-24-2017, 07:02 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Quote:
I have an HKS that I've had for 21 years now that's been on 2 different cars that works fine. |
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05-24-2017, 09:19 AM
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Registered
Join Date: Oct 2013
Location: Seattle, WA
Posts: 1,083
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FWIW I use TiAL wastegates and Forge BOVs on my turbo cars.
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- 86 Porsche 930 - Mr.Hyde - 86 BMW 635CSi - Dr.Jeykell - 2006 Infiniti M45 Sport https://medium.com/@crashingdoor |
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05-24-2017, 10:16 AM
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Registered
Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 2,855
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Quote:
We put twin BOVs on the plenum housings of HAMS' 930, and there is zero waiting for the system to be recharged. Those compressors are displacing an extraordinary amount of air, and that doesn't stop just because a BOV opens. It refills nearly instantaneously.
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Chris Carroll TurboKraft, Inc. Tel. 480.969.0911 email: info@turbokraft.com http://www.facebook.com/TurboKraft - http://www.instagram.com/TurboKraft |
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05-24-2017, 11:00 AM
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Registered
Join Date: May 2005
Location: Loxahatchee, florida
Posts: 2,894
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Quote:
__________________
88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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05-25-2017, 05:34 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Quote:
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05-25-2017, 05:54 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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The theory was akin to disconnecting an air hose from an air compressor. If you disconnect at the coupling, it takes time to bleed the pressure. If you reconnect quickly, you won't loss the entire pressure in the line, thus taking less air to get the pressure back up to say, 125PSI.
Apples to oranges I guess, but similar behaviors. |
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05-25-2017, 05:57 AM
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Registered
Join Date: May 2005
Location: Loxahatchee, florida
Posts: 2,894
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I just had a thought about twin wastegates. I was planning on running them both out the back of the car next to the outlet of a Zork tube. How evil would the car sound on boost if I cut notches similar to those in a steam whistle in them.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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05-25-2017, 06:07 AM
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E-85 sippin drunk
Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,554
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Quote:
As far as WG's are concerned, I run two of them. Since I had Brian make me the headers, it was an easy choice to do the dual Wg's. It definitely sounds awesome when they open up  ))) Here is a video of the underside of my engine, showing the twin WG's...
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk Last edited by turbobrat930; 05-25-2017 at 07:36 AM.. |
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05-25-2017, 07:29 AM
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Registered
Join Date: May 2005
Location: Loxahatchee, florida
Posts: 2,894
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well the thread is for bov's but just thinking how mean you could make a waste gate sound.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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05-25-2017, 07:37 AM
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E-85 sippin drunk
Join Date: Jan 2002
Location: Warner Robins, GA
Posts: 1,554
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Quote:
__________________
Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk |
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05-25-2017, 07:53 AM
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Registered
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I sure hope so. The thought of getting it running and setting up the maps is kida terrifying, but know eventually it will all be ok. The first couple times there were always things I wanted to do but couldnt afford. This time it's going to be exactly what i want which is why it's taking forever.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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05-26-2017, 04:52 AM
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Ingenieur
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It is theoretical, but the theory is correct. Your toilet wouldn't flush if it weren't! I suppose if you are measuring using a "butt Timex" it is instantaneous, but with a little instrumentation you can measure the difference. Here is a shot of the Honda HR28TT. The tan colored circular cover is the BOV. It is as close to the compressor diffuser as you can get, the "theoretical" best position. Packages nice too. Standard stuff on BW turbos nowadays.
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05-27-2017, 06:25 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Yes sir, that's where I learned the theory - from BW.
My boost recovery is insane for the largest, mid-frame turbo from BW. When you see the little red light come on at the bottom left of the video, that indicates 1 bar: https://youtu.be/yjzWI9GGkTQ Last edited by Tippy; 05-27-2017 at 09:02 AM.. |
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05-27-2017, 09:00 AM
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Registered User
Join Date: Mar 2016
Posts: 1,219
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Thats freekin crazy.
Sent from my SM-N910T using Tapatalk |
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05-27-2017, 12:37 PM
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