Pete @ Stratmosphere

<center><img src="http://www.stratmosphere.com/forge_piston_top_threequarter_320b.jpg"></center><p>We have been spending quite a bit of time talking with Forge in England and testing on cars here in North America. We have worked with some participants here as well as with our own 225 TTR.

The Forge Dump/Diverter valve that we are offering is a good alternative to the OEM valve or other aftermarket valves.

You will notice that the valve is completely serviceable and may be taken apart for lubrication or replacement of internal parts.

We have a very small supply at the moment but will have an allocation of 75 valves for customerss on 10/24/00. Our introductory price is $124.99. -Pete<ul><li><a href="http://www.stratmosphere.com/forge_valves.htm">Stratmosphere Forge Diverter/Dump Valves for the TT</a></li></ul>

ctmooregottapee

Any experts have any comments on using this valve instead of the Bailey??

john s

on the piston material - glass transition temperature & creep data
valve seat construction

MichaelTT

<center><img src="http://pictureposter.audiworld.com/AudiWorldPics/2000/ForgeBailey.jpg"></center><p>First my 225 is a MTM version ECU...so my comments are only accurated based on that engine management system...

Forge arrived Express Mail yesterday and I immediately did an install in the 'reversed' orientation' (eg base of DV to pressure side hose) and tested...could hear a 'chuffing sound' at throttle lift off (very similiar to the Bailey in sound but slightly less Db) and worked very well...no problems. I then re-reversed the Forge DV so that the set up mimics the orientation of the OEM DV install (eg base of DV now to the low pressure side hose and thus the side port to the high pressure side hose) and took her out. First the sound at throttle lift off was about the same but unlike the Bailey in this orientation there was no 'Darth Vader' sounds. Also the overall engine characteristics seemed to smooth out a bit...felt more refined. Now back to my first statement about this being a MTM car...I feel that the Forge DV is better suited for the MTM setup and the build quality of the Forge is excellent. I also will say that I have found nothing wrong with the Bailey (thank heaven of what ever the Bailey was around...had it since July when my car became undrivable due to the total failure of the OEM 'E' DV) and 225TTR still is running with the Bailey with a APR ECU setup...she reports no problems.
As I get more miles on the Forge DV I will share my impressions but as of this moment I like what I see and feel (driving that is).

Rennen

Plus, I'm in the MTM camp for my mods.....double hmmmm

Chaka

Or was it the same either way. Also was the temperature the same when you reversed it?
Thanks

dTTc

What the hell. I'm just starting to get the honk (but soon, at ~400 mi). I'm still adjusting to the turbo, so it's a bit hard to tell what's abnormal surging and what's regular turbo mechanisms, but I'd rather get it before it gets worse. Fwiw, it does seem to happen more often when it's warmer, in the middle of the day. Morning and evening I haven't heard it (yet).

I also may chip at some point, so I figure it's worth it.

o2bnme

Intro price is cheaper... way to go Stratmosphere/Forge!

Ferris TMK

You can't tease us S4 owners like this :P

VAP

First & foremost this valve by its very shape/profile appears to still be a "diaphram" valve... no different in that respect to the stock Bosch valve. We ran Forge years ago on high boost/low compression race cars and they failed with aplomb and regularity. Repeated conversations with Forge said the diaphram should be replaced after every race. Valve continued to fail. In that time we switched piston type valves (ala Bailey) and we never replaced another one.

I know in the years since great strides in polymer/co polymer diaphram material has been attained and honestly I have no direct experience with contemporary Forge valves.

But common sense dictates pliable material with elastomers and co polymers reinforced or unreinforced, under repeated and frequent stress/duty cycles will fail... in ANY/ALL mediums. Not a matter of "if"... simply "when."

Close tolerance piston/sleeve type valves will ALWAYS be more expensive. Look at airless paint sprayers, diaphram type compressors and their associated diaphram replacement intervals versus piston/cylinder units. Same thing except your airless sprayer wont leave you on the side of the road 340 miles from the nearest Audi dealer.

Simply put, if you buy this valve, never... I repeat NEVER let your backup stock valve out of your car... you're gonna need it... may be 10 minutes or 10 years but count on it. If you put the Bailey (or comparable) in... cut open your stock one... see what makes it tick... then '86' it forever without fear.