ProjectGSX
11-07-2000, 05:33 PM
Here is the write-up I did on the TurboXS H-RBV. Bottom line, it rocks. I think this valve is the best combination of Form and Function available.
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Quality and Fit: Beautiful unit. Bolt holes were machined slightly too small, easy to fix with a round file. Relayed the problem to TurboXS and they have corrected it with their manufacturer.
Ease of Installation: Simple - Bolt on.
Instructions: The instructions give all necesary information.
Price: More expensive than the standard 1G BOV. About the same price as GReddy, etc. Better quality, excellent appearance.
Availability: Can be ordered online at http://www.turboxs.com
Customer Service: Excellent. Provided a 2G intake cap and a softer spring upon request. Also very receptive about the manufacturing problem with the bolt holes, corrected the problem promptly.
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Big. It is very big. And shiney. It is very shiney. Chrome and purple andonized aluminum - it looked so pretty sitting in the box. I was very excited when I received my TurboXS Type-H Racing Bypass Valve (RBV) in the mail. They have certainly done a great job designing it. Below is a picture of the RBV, and then another with it beside a normal size Coke can, to give you an idea of how big it is.
http://www.projectgsx.com/pics/mods/turbo/bov.jpg
http://www.projectgsx.com/pics/mods/turbo/bov_size.jpg
The design is relatively simple. There is a nipple at the top of the RBV that gets connected to a boost pressure source, to keep pressure on top of the spring. The spring, unlike the smaller BOVs, is long and not progessively coiled. This allows for better adjustability. Under the piston is a pole, which connects to the valve.
http://www.projectgsx.com/pics/mods/turbo/bov_piston.jpg
http://www.projectgsx.com/pics/mods/turbo/bov_unassembled.jpg
Installation was relatively simple as well. You have to consider how difficult it would be engineering an "installation kit" for a large RBV like this one. Most people who would buy a high end RBV like this one already have an after-market upper intercooler pipe. All of which are slightly different in their bends and curves. All of them have slightly different mounting flanges, as well. The RBV install kit comes with a 90 degree adapter, and a flange. The washers pictured below are included with the RBV. You place them on top of the spring, to put pre-load pressure on it to keep it shut longer.
http://www.projectgsx.com/pics/mods/turbo/bov_install_parts.jpg
First, I started by removing the stock dump tube that runs from the BOV to the intake pipe. The RBV is designed to be plumbed back into the intake, but I wanted to try venting to atmosphere first. Since the install kit I have is for a 1G (because the flange on the upper i/c pipe is for a 1G BOV) it did not come with a cap large enough to fit over the hole in the intake pipe. I was able to take the dump tube and insert a purple hose adapter into it, which is supplied in the RBV package, and then cap it off with the supplied cap. Click the pics below to see how this was done.
http://www.projectgsx.com/pics/mods/turbo/intake_cap.jpg
http://www.projectgsx.com/pics/mods/turbo/intake_cap_done.jpg
http://www.projectgsx.com/pics/mods/turbo/intake_cap_done_installed.jpg
After speaking to TurboXS about this, they informed me that you can request a 2G intake cap be included with the kit. But, to use it, you need to remove the plastic dump tube from the intake, which is not reversible. Or, you can use the cap with a short length of hose.
The same effect could be achieved by cutting the dump tube shorter, but then you would not be able to undo it. Since I was not sure if I wanted to leave it venting to atmosphere, I figured I should find a way to cap off the intake so you can undo it later. I also happen to have a custom made intake cap laying around from Destiny's car, which I ended up using. It does not look quite so ghetto. :)
Next, I pulled off the 1G BOV I had been using previously.
http://www.projectgsx.com/pics/mods/turbo/no_bov.jpg
There is a very thin gasket between the BOV and the flange. You have to reuse it so be VERY careful as you remove the BOV. Take the time and do it slowly, you will be glad you did. Once you seperate the gasket from the old BOV, set it aside. The next problem I ran into, is that the bolt holes on the flange are too small. BARELY too small. About a milimeter. This could be due to the bolts that Buschur sent me, but I doubt it. Luckily I had my die grinder on hand and was able to open up the holes enough to get the bolts through. You need to reuse the bolts that held your previous BOV on. Below is a comparison picture of the bolt holes in the 1G BOV and the holes on the adapter flange for the RBV 1G install kit.
http://www.projectgsx.com/pics/mods/turbo/bov_hole_comparison.jpg
I let TurboXS know about this problem as well, and they have resolved the issue with their manufacturer. So, no one else should run into this problem.
Now that the holes are wider, assemble the RBV. The RBV gets bolted to the 90 degree bend using the supplied hex bolts. The 90 degree bend then gets bolted to the flange, again using the supplied hex bolts. Then bolt the assembled RBV to the upper i/c pipe, making sure you place the gasket in between. You will need to play around with different angles to get the RBV to fit properly, since it is so large. The links below are to TurboXS's web site, showing the RBV installed on a 2G.
http://www.turboxs.com/images/Eclipse_Enginebay1.jpg
http://www.turboxs.com/images/Eclipse_Eginebay2.jpg
http://www.turboxs.com/images/Eclipse_Enginebay3.jpg
Since I am venting to atmosphere, mine looks a little different:
http://www.projectgsx.com/pics/mods/turbo/bov_installed.jpg
I have since adjusted my RBV so that it is in the proper position to be plumbed back into the intake, even when I am venting it to atmosphere. This way switching it from one to the other is easier.
The orange hose with the silver cap you see in that picture, is what I used to block off the return pipe in the intake. I was worried that engine movemeny might bang that cap against the RBV, so I used a zip tie to hold the intake pipe closer to the radiator fan.
Let the tuning begin!
When I first installed the RBV, I put it on as is, with none of the adjustment washers. It ran fine, idle was great, and no flutter between shifts like Destiny has with her GReddy BOV. Needless to say, I was happy. Right out of the box and working great. It did seem that boost was building slower, so I figured that the RBV was opening a little earlier than it needed to. I threw a pair of washers in there and started it up.. horrid idle, and almost died every time I pushed on the gas pedal. Whoops! I had unplugged the cable to the MAS so that I could get better access to the top of the RBV and forgot to plug it back in.
With that fixed, I juiced up the car and she was purring like a kitten. Boost built faster as well. However, with the unit plumbed into the intake, the car runs better with no washers at all. Word from TurboXS, is that they ship this unit with a softer spring now which allows for a wider range of adjustment.
UPDATE - I edited this post to correct all of the URL's since I have reorganized my website. All of the picture links should be working now.
[Edited by ProjectGSX on 07-19-2001 at 07:10 PM]
-----
Quality and Fit: Beautiful unit. Bolt holes were machined slightly too small, easy to fix with a round file. Relayed the problem to TurboXS and they have corrected it with their manufacturer.
Ease of Installation: Simple - Bolt on.
Instructions: The instructions give all necesary information.
Price: More expensive than the standard 1G BOV. About the same price as GReddy, etc. Better quality, excellent appearance.
Availability: Can be ordered online at http://www.turboxs.com
Customer Service: Excellent. Provided a 2G intake cap and a softer spring upon request. Also very receptive about the manufacturing problem with the bolt holes, corrected the problem promptly.
-----
Big. It is very big. And shiney. It is very shiney. Chrome and purple andonized aluminum - it looked so pretty sitting in the box. I was very excited when I received my TurboXS Type-H Racing Bypass Valve (RBV) in the mail. They have certainly done a great job designing it. Below is a picture of the RBV, and then another with it beside a normal size Coke can, to give you an idea of how big it is.
http://www.projectgsx.com/pics/mods/turbo/bov.jpg
http://www.projectgsx.com/pics/mods/turbo/bov_size.jpg
The design is relatively simple. There is a nipple at the top of the RBV that gets connected to a boost pressure source, to keep pressure on top of the spring. The spring, unlike the smaller BOVs, is long and not progessively coiled. This allows for better adjustability. Under the piston is a pole, which connects to the valve.
http://www.projectgsx.com/pics/mods/turbo/bov_piston.jpg
http://www.projectgsx.com/pics/mods/turbo/bov_unassembled.jpg
Installation was relatively simple as well. You have to consider how difficult it would be engineering an "installation kit" for a large RBV like this one. Most people who would buy a high end RBV like this one already have an after-market upper intercooler pipe. All of which are slightly different in their bends and curves. All of them have slightly different mounting flanges, as well. The RBV install kit comes with a 90 degree adapter, and a flange. The washers pictured below are included with the RBV. You place them on top of the spring, to put pre-load pressure on it to keep it shut longer.
http://www.projectgsx.com/pics/mods/turbo/bov_install_parts.jpg
First, I started by removing the stock dump tube that runs from the BOV to the intake pipe. The RBV is designed to be plumbed back into the intake, but I wanted to try venting to atmosphere first. Since the install kit I have is for a 1G (because the flange on the upper i/c pipe is for a 1G BOV) it did not come with a cap large enough to fit over the hole in the intake pipe. I was able to take the dump tube and insert a purple hose adapter into it, which is supplied in the RBV package, and then cap it off with the supplied cap. Click the pics below to see how this was done.
http://www.projectgsx.com/pics/mods/turbo/intake_cap.jpg
http://www.projectgsx.com/pics/mods/turbo/intake_cap_done.jpg
http://www.projectgsx.com/pics/mods/turbo/intake_cap_done_installed.jpg
After speaking to TurboXS about this, they informed me that you can request a 2G intake cap be included with the kit. But, to use it, you need to remove the plastic dump tube from the intake, which is not reversible. Or, you can use the cap with a short length of hose.
The same effect could be achieved by cutting the dump tube shorter, but then you would not be able to undo it. Since I was not sure if I wanted to leave it venting to atmosphere, I figured I should find a way to cap off the intake so you can undo it later. I also happen to have a custom made intake cap laying around from Destiny's car, which I ended up using. It does not look quite so ghetto. :)
Next, I pulled off the 1G BOV I had been using previously.
http://www.projectgsx.com/pics/mods/turbo/no_bov.jpg
There is a very thin gasket between the BOV and the flange. You have to reuse it so be VERY careful as you remove the BOV. Take the time and do it slowly, you will be glad you did. Once you seperate the gasket from the old BOV, set it aside. The next problem I ran into, is that the bolt holes on the flange are too small. BARELY too small. About a milimeter. This could be due to the bolts that Buschur sent me, but I doubt it. Luckily I had my die grinder on hand and was able to open up the holes enough to get the bolts through. You need to reuse the bolts that held your previous BOV on. Below is a comparison picture of the bolt holes in the 1G BOV and the holes on the adapter flange for the RBV 1G install kit.
http://www.projectgsx.com/pics/mods/turbo/bov_hole_comparison.jpg
I let TurboXS know about this problem as well, and they have resolved the issue with their manufacturer. So, no one else should run into this problem.
Now that the holes are wider, assemble the RBV. The RBV gets bolted to the 90 degree bend using the supplied hex bolts. The 90 degree bend then gets bolted to the flange, again using the supplied hex bolts. Then bolt the assembled RBV to the upper i/c pipe, making sure you place the gasket in between. You will need to play around with different angles to get the RBV to fit properly, since it is so large. The links below are to TurboXS's web site, showing the RBV installed on a 2G.
http://www.turboxs.com/images/Eclipse_Enginebay1.jpg
http://www.turboxs.com/images/Eclipse_Eginebay2.jpg
http://www.turboxs.com/images/Eclipse_Enginebay3.jpg
Since I am venting to atmosphere, mine looks a little different:
http://www.projectgsx.com/pics/mods/turbo/bov_installed.jpg
I have since adjusted my RBV so that it is in the proper position to be plumbed back into the intake, even when I am venting it to atmosphere. This way switching it from one to the other is easier.
The orange hose with the silver cap you see in that picture, is what I used to block off the return pipe in the intake. I was worried that engine movemeny might bang that cap against the RBV, so I used a zip tie to hold the intake pipe closer to the radiator fan.
Let the tuning begin!
When I first installed the RBV, I put it on as is, with none of the adjustment washers. It ran fine, idle was great, and no flutter between shifts like Destiny has with her GReddy BOV. Needless to say, I was happy. Right out of the box and working great. It did seem that boost was building slower, so I figured that the RBV was opening a little earlier than it needed to. I threw a pair of washers in there and started it up.. horrid idle, and almost died every time I pushed on the gas pedal. Whoops! I had unplugged the cable to the MAS so that I could get better access to the top of the RBV and forgot to plug it back in.
With that fixed, I juiced up the car and she was purring like a kitten. Boost built faster as well. However, with the unit plumbed into the intake, the car runs better with no washers at all. Word from TurboXS, is that they ship this unit with a softer spring now which allows for a wider range of adjustment.
UPDATE - I edited this post to correct all of the URL's since I have reorganized my website. All of the picture links should be working now.
[Edited by ProjectGSX on 07-19-2001 at 07:10 PM]