My Experience with Bypass Valves
 

Last night I changed out my Forge Motorsport 007P for a Perrin Signature Series Blow Off Valve both are recirculating valves. The Forge valve made a the stupidest sound i've ever heard. It's sounds like a hammer hitting an anvil. It drove me nuts it seemed to work just as it should but I couldn't stand the noise it made. I was fortunate enough to findan old Perrin BOV forsale on a local board. Man!! this thing sounds way better just a slight woooosh noise. I just wanted to give a brief review of these.. The Forge valve works well but sounds like ass.. Perrin works well and sounds like sex with Alison Armitage.

I'd hit it
http://www.simplygorgeouswomen.com/A...Armitage-2.JPG

i'm a sucker for a red head..

Why not just get a bosch valve if your recirculating? I hear those are pretty reliable and cheap to boot.

videos of both now please; I don't read books, I listen to the CD.

because the Perrin was deliverd to my door for just slightly more than the Bosch and I got it the same day.

The Forge is never going back on my car.. If it wasn't so expensive I’d hurl it in to the Ohio River..

Install the valve the other way around and it won't make that sound.

too late.. it was installed per the "destructions" and it failed..

....so your saying he installed the valve backwards?:rofl:

No, he is saying you need to install it backwards to get rid of the shitty Ping sound.

+1 I find the Bosch valve sound great...plus getting a hookup from a tech @ Audi even sweetened the deal...OP do you have any sound clips?

No, just take a hammer and hit an anvil there is your sound. It’s an extremely audible ping.

The 007 is a direct replacement for the valves used on the VAG 1.8T, so I don't know what instructions you are referring to. Which happens to be the Bosch 25mm valve. The OEM unit is installed on the 1.8Ts with boost entering the side port and exiting the bottom, this is how the 007 should be installed. The face of the piston on the 007 is concave, the sound you are hearing is air whistling across this depression.


The valve will work either way but it will make that sound if you install it with boost entering the bottom. There is a huge group amongst the VAG guys that install them "reversed" for the sound...

Regardless, we offer a lifetime satisfaction guarantee so if you aren't happy, which you obviously aren't, you can return it for a refund. Even though, from what I can tell, you had the thing installed "wrong".

I vote for a reinstall with video comparison.

The instructions that were in the box clearly show in pictures which way to install if you have any knowledge of VWs which I do and so does the VW tech that was with me. It's not a sound that could be made by air. It’s a sound that could only be made by metal hitting metal. He has installed tons of Forge Valves (we even used the soap trick) and he has never heard this sound coming from one before installed either direction.

It’s nice of you to assume I’m screwing up and not your product.

Fuck it. it's not worth my time. I had to reroute my Bypass hose because the Perrin is set up differently.

If these guys don't know how to install a forge Bypass then who the hell would??

Attachment 213299

Hmmm.... This is a timely thread for me. I need to try mine both ways and see what I like better. Right now I have the boost entering the bottom and it makes a sound that could be described as a ring. It is kind of annoying and I would like to get rid of it. If changing the valve configuration makes a significant difference in the sound I will try to do a before-after video clip. Don't hold your breath though as I may not get to it for a week or so.

I just got home and opened up the valve. It appears to be missing one of the O-Rings. Correct me if i'm worng but it should have two in the main body and one sealing the top?

This service PDF shows an 006 so it might be different.

http://www.forgemotorsport.com/valve_service.pdf

So I tried the valve both ways and it definitely makes a difference. When the fitting on the side is connected to boost the ringing sound goes away almost completely. It is now a higher pitched hissing sound when the valve opens. I also experimented with a stiffer spring today and that also changed the sound; it eliminated the part-throttle ringing (or hiss depending on how it is connected).

At any rate I'll be running it with the boost on the side connection from now on. That whistle was getting to be annoying so I am glad there was an easy fix. Thanks Pat.

I did a back-to-back comparison and video taped it but the sound quality is not good at all and thus does not capture the difference in sound. It is not worth posting the vid clips, sorry.

Glad something good came out of this thread. My sound was nothing like subtle. I could hear a metal to metal ping sound well over my engine sound with the top down at a 75 MPH shift. It would make people walking on the side of the road stop and look waiting for parts to start falling out of my engine bay.. It was nasty.. On a good note I have a local guy that is taking my forge valve off my hands. He has an A4 1.8t and thinks he can get an O ring for it. I'm selling it for about 50% of what I paid which was 50% of the original owners cost. I made sure he knew about the issues I was having and the missing o ring. I guess for $40 bucks it was worth the chance to him. I'm just glad it's going away.

Yeah no o-ring in that bottom piston area would allow the piston to strike the body hard. So it is not just a seal, it is also a bump-stop. I can see how it would make a really bad noise with that o-ring missing.

I'll bet if he gets an o-ring for it and runs it with the boost connected to the side he will be happy with it. Since you had metal-to-metal contact I would tell him to check the seal surface on the piston and on the body surface to make sure they are not damaged or have burrs. That would tear up a new o-ring pretty quickly.

Thanks for the input I just PM'd him your exact words. it is scared a bit.. I think a little sand paper and some time will take off the burrs. It’s scared opposite the side port just below the first o ring so it makes sense.. I only ran it for about 20 miles like that so hopefully it will work out for him.. He is picking it up tomorrow before work it turns out he works like a block and a half away, Louisville is a small town.

We'll my apologies for assuming you had it installed incorrectly but I will say that, as can be evidenced by ZX-Tex's post, the ringing sound from backwards installation is a real thing and an internet diagnosis of a sound is nearly impossible. The words you used to describe the sound are the same I read from people running the valves backwards.

Have the person that bought the valve send an email to sales@forgemotorsport.com asking for a rebuild kit for the 007. We send them out for free, includes a new piston, all the o-rings in the valve and a packet of grease. Or if the body of the valve is too damaged we can send him a new valve. If that's the case tell him to send a few pictures. Or he can send the valve back to us to inspect and we will either rebuild or replace depending on what we see.

As for that picture you posted... neither Grossman Tuning nor Image Auto Detail are Forge Dealers. They must be buying through someone in our dealer network. The instructions must have been drawn up by either the company that you bought the valve from or the dealer they got it from as we don't include installation instruction with the 007, just a guide on how to tune the valve with the springs and shims.

Thanks.. i'll send him this info...

BTW there are install instruction posted on your website with pictures..

http://www.forgemotorsport.com/valve.pdf


Those are the same ones that came in the box with the valve

Interesting. I've never seen that before. That thing predates my employment with the company... we don't even make the valves pictured any longer and I know that in the past 2 and a half years we've never supplied those instructions with any of our valves... although I've always been bothered by NOT including them.

I'll update the photos and tell the guys that assemble our orders in the UK to start including them. Hopefully save me a few tech calls each week on how to install the damn things.

OK go to the BOV link in my sig for updated pictures of how it is installed now. After switching the inlet and outlet and installing the heavier spring I drove it some more today and I am much happier with the sound. The valve does not open up as often, but it still opens up far and fast enough at hard throttle cuts to prevent compressor surge. And the part throttle whistling is gone.