Blow Off Valve: Do the flange type and location of the valve matter

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Old Dec 29, 2019 | 11:35 AM
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Default Blow Off Valve: Do the flange type and location of the valve matter

So every time I post now I feel a bit dumber lol. Its been a while since I've modified things and I figured I'd double check before venturing forth.

I have an EK hatch with a boosted B18 in it, car came with a TurboXS Blow Off Valve installed on the piping. If I wanted to switch it out for something like an HKS Super Sequential, would the mounting point be the same ? Any issues that could arise from switching brands/models as far as it not being "plug and play" ?

Thanks in advance
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Old Dec 29, 2019 | 11:47 AM
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Default re: Blow Off Valve: Do the flange type and location of the valve matter

The flange might be different.
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Old Dec 29, 2019 | 01:02 PM
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Default re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by Caoboy
The flange might be different.
the welding flanges may be different. the ones from Turbosmart & TiAL are the same. The HKS is unique to that company, and although GReddy has some 3rd party makers of their flange, it is not as wide as the genuin6article from GReddy.

As for location, they're typically to stay in the same location.
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Old Dec 30, 2019 | 07:27 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by TheShodan
the welding flanges may be different. the ones from Turbosmart & TiAL are the same. The HKS is unique to that company, and although GReddy has some 3rd party makers of their flange, it is not as wide as the genuin6article from GReddy.

As for location, they're typically to stay in the same location.
Location is anywhere between the compressor outlet and TB. I have seen many setups varying in location and I guess it is a good deal of preference but, usually closer to the TB is best. Seen a LOT of setups with the BOV immediately after the IC, quite a few with the BOV mounted ON the IC, but most do well about 6-12" before the TB.
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Old Dec 31, 2019 | 09:42 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by Txdragon
quite a few with the BOV mounted ON the IC
You know, that was really popular there for a minute...what happened to that trend? I almost forgot folks were doing that.
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Old Dec 31, 2019 | 10:16 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by DaX
You know, that was really popular there for a minute...what happened to that trend? I almost forgot folks were doing that.
Couple boosted B-series guys out my way have it like this. Come to think of it, they are also closer to my age as well, being in their late 30's. Lol! I'd guess it died down due to costs. Folks got cheap and modifying an end tank for a BOV either meant an unnecessary spend, or larger spend on a custom front mount.
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Old Jan 2, 2020 | 02:25 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by DaX
You know, that was really popular there for a minute...what happened to that trend? I almost forgot folks were doing that.
From what I recall, the theory for that location was to minimize turbo surge. I don't think anyone was able to really prove it was better than the typical FMIC piping before the throttle body.
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Old Jan 2, 2020 | 03:42 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by NVturbo
From what I recall, the theory for that location was to minimize turbo surge. I don't think anyone was able to really prove it was better than the typical FMIC piping before the throttle body.
Well, sir, the purpose of the BOV is to minimize surge (not inferring you don't know this) but seems to have been lots of variation in placement. It has been moderately debated as to the "best" location but, nothing definitely proven. A relief in the pressure zone (anywhere between the compressor outlet and pre-throttle plate) would suffice. One would think, on paper, that between the hot side IC inlet and compressor outlet- in the charge pipe, would be even better assuming pressure loss across the IC at the cold outlet; You'd release ALL the compressor pressure when the throttle was lifted.
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Old Jan 2, 2020 | 06:10 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by Txdragon
Couple boosted B-series guys out my way have it like this. Come to think of it, they are also closer to my age as well, being in their late 30's. Lol! I'd guess it died down due to costs. Folks got cheap and modifying an end tank for a BOV either meant an unnecessary spend, or larger spend on a custom front mount.
DING DING DING DING.... Another trend created by Full Race with no information to support their reasoning.
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Old Jan 2, 2020 | 08:36 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by TheShodan
DING DING DING DING.... Another trend created by Full Race with no information to support their reasoning.
I guess their overpriced turbo kits had to have some kind of BS advertisement to lure gullible customers. LOL
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Old Jan 2, 2020 | 03:06 PM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by NVturbo
I guess their overpriced turbo kits had to have some kind of BS advertisement to lure gullible customers. LOL
Been happening for over a decade and still happens with their "twin scroll" misnomer on their larger divided turbine inlet turbos.
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Old Jan 3, 2020 | 04:23 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by TheShodan
the welding flanges may be different. the ones from Turbosmart & TiAL are the same. The HKS is unique to that company, and although GReddy has some 3rd party makers of their flange, it is not as wide as the genuin6article from GReddy.

As for location, they're typically to stay in the same location.
TS 50mm and Tial 50mm are actually different flanges. TS makes a version of their BOV to fit the standard Tial flange, but the Tial 50mm does not seat on the TS flange..more confusing than it needs to be. Looking at them separately it would be unnoticeable; but the outer lip/o ring seating is definitely different.
Swapping from a TXS to an HKS would be a flange change typically, as they are definitely different flanges (if you have the "univesal" TXS RFL"). The 2 could be adapted via coupler, but the ideal solution would be to cut/replace flanges to fit the appropriate valve direct to the pipe.
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Old Jan 3, 2020 | 01:22 PM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by Autoworks
TS 50mm and Tial 50mm are actually different flanges. TS makes a version of their BOV to fit the standard Tial flange, but the Tial 50mm does not seat on the TS flange..more confusing than it needs to be. Looking at them separately it would be unnoticeable; but the outer lip/o ring seating is definitely different.
Swapping from a TXS to an HKS would be a flange change typically, as they are definitely different flanges (if you have the "univesal" TXS RFL"). The 2 could be adapted via coupler, but the ideal solution would be to cut/replace flanges to fit the appropriate valve direct to the pipe.
I suppose. but I have the different part numbers that allow for the interchangeability between the two..

So my apologies for my perspective.
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Old Jan 4, 2020 | 07:04 AM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by TheShodan
I suppose. but I have the different part numbers that allow for the interchangeability between the two..

So my apologies for my perspective.
Right, interchangeability for TS, not Tial.
Just trying to clarify for those that may get confused as it can be confusing.
TS has 2 flange part #s for the 50mm Raceport (one for the TS specific flange, and one for Tial flange fitment).
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Old Jan 5, 2020 | 12:47 PM
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Default Re: Blow Off Valve: Do the flange type and location of the valve matter

Originally Posted by Autoworks
Right, interchangeability for TS, not Tial.
Just trying to clarify for those that may get confused as it can be confusing.
TS has 2 flange part #s for the 50mm Raceport (one for the TS specific flange, and one for Tial flange fitment).
Roger that..
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