My hands are average size but this looks like a pain in the butt for DIY'er. Will I notice a difference with upgrade values vs. the OEMs? Beside the values should I also replace the hoses and if so, is there a kit that is sold with high quality valves and the hoses that are made in the same angles as the OEM valves and hoses?

From my '01 996tt: 0 280 142 102

I went with Bailey's DVs from AWE because they require no maintenance.

It is a pain for sure, but it is very do-able. If your valves are in bad shape, you will notice a difference, but if they are fine you won't. It is more a preventative measure on stock HP motors, but if you plan on doing a flash in the future it would be a good idea. Same with boost hoses...if you plan on doing a flash or adding bigger turbos, it is a great idea. I have boost hoses on my car and I never worry about blowing a hole in the side of a hose, or a hose coming off because I know they are secure and are made for the extra power.

As far as hoses/DV's, I bought hoses from Vivid and DV's from EVOMS. If you are just replacing the DV's, I would skip the hoses for now, but I would buy an F-hose, which attaches to the DV's. Both Vivid and EVOMS sell F-hoses seperately, and I think they are around $100. I can't speak for the EVOMS hoses, but the Vivid hoses work well and everything lines up and fits well.

Interesting...
I know no one on this board is going to believe it, but there is an alternative Bosch valve that is actually pretty good. Part # 0 280 142 110 is a Bosch sport valve. The diaphragm is made of a different polymer and resists tearing. It also has pretty stiff spings and great response and close times.
Back in my days with the S4 (which run about the same boost as flashed 996TTs run), guys switched from the stock valves to the valves ending in 110 (or 114) and had no problems. Guys have been running these in Audis since 02 and I've never heard of one of these valves leaking. I know plenty of guys who run these valves at 1.3 bar on their Audis. Some of the more technically inclined guys did some pretty extensive testing and found that there was a real difference (see below).

The best part is they look 100% stock (no warranty concerns), they never have to be opened to lube the piston (as with every other after-market valve) and they're cheap. If I recall correctly they're around $40 bucks each.

Check these links out for more info:
http://www.s4biturbo.com/art-dvtests.php
http://www.s4biturbo.com/art-dvtests2.php
http://www.hoppenmotorsport.com/BoschBypass.htm

Flame away because nothing that comes from bosch can be as good as aftermarket :rolleyes:, but I just thought I'd throw my .02 in incase anyone was interested.

I love my hyperboost items. They sorted my boost issue out immediately also.

Just looking at them you can tell they are amazing quality.

Yes they are a ***** to fit.

Lee

That's pretty interesting - sounds like a good alternative at a great price...

I don't believe Bailey DVs have to be lubed.

I plan on doing an ECU tune on my 02 X50 in the spring...

Maybe I will try these (0 280 142 110) Bosch sport valve. Heck, at $40 bucks each, thats a nice alternative. The cheapest price diverter valves I found are the GMG at $125 each.

Id like to hear of an actual Porsche turbo running these Bosch sport valves and get some feedback.

Correct me if I'm wrong, but isn't a Bailey valve the same design as every other billet aftermarket valve? It's a metal piston in a metal cylinder with a spring behind it. If not properly lubricated, the piston can seize in the cylinder. Why would a Bailey valve not need servicing when all other billet valves need servicing?

The stock valve uses a rubber diaphragm, so there is no metal to metal contact to be lubricated, hence no servicing.

I don't know about you, but once I put replacement valves in, I NEVER want to take them out again. That's why I think the Bosch part is the best option.

Good idea, worth trying, especially as they would look stock. I'm looking at replacing my diverters when I upgrade the turbos and add an ECU flash, and the Bosch part seems like a good alternative.

Seal Grey,

Thank you for an informative article!
As a side note, when my buddies CTR2 was being "freshened" at Ruf, Germany, I suggested they replace his Bosch Diverter Valves (of course they use the upgraded ones); with forged aluminum ones like mine, they laughed!

MK

I dropped Joe Hoppen Motorsport in Sarasota FL to see what the cost is for these Bosch 110 valves. Mike Hoppen promptly responded to my email saying that they are $65 each plus $7 shipping and 6% state cause I live in the sunshine state. Still a good price for an upgrade OEM Bosch valve. Would there be any interest in doing a group purchase? I could certainly ask him if he would extend us a group purchase if I had an idea as to how many would be interested in this. Let me know. His contact information is:

Joe Hoppen Motorsport
6245 Clark Center Ave. Unit M
Sarasota, FL 34238
(941) 924-6380
www.hoppenmotorsport.com

I've used these valves on ~2-3 996tt's and ~150 s4's :) . As Seal said....they work perfect, look stock and cost next to nothing.

wow, that's great news it's only taken them 10 years to design a better dv.