David in LA

Any recommendations for billet diverter valves? Pros/cons, price, vendors, etc?

TIA

ScottMellor

I put in the forge diverter valves and used the yellow spring because I run a little more boost than stock.
Mainly I got 'em because they look bitchin'.
Even though you can't see them...
I have issues.

ronnie993tt

Lots of threads on this. Mine came with 'em but apparently it's a high ROI upgrade....

wagongotya

06A 145 710N (Bosch 0 280 142 114)

hal m

EVO

AC/911's

I have these, supposed to be real product not reproduction. https://vastperformance.com/index.ph...1-8t-2-7t.html

David in LA

Basal Skull

I have forge dv's as well but put the green springs back in after having problems with blown intercooler hoses. I think the aluminum valve is a lot heavier than the rubber diaphragm and takes more negative pressure/vacuum to open the valves = some boost surge and popping off the hoses/stress on your turbos. Haven't had any more hose problems. I asked people on the board a while back if people only have hose difficulties with aftermarket Dv's but no one answered/posted on my ask thread...

David in LA

Are you running stock boost?

TIA

Spartan

The metal aftermarket DV's have been proven time and time again on other platforms to perform poorly. They stick and require alot more maintenance than 99% of owners can throw at them. They are expensive, shiny little turds.

Get the 710N's. Its the beefier version of the stock DV's and come with a stronger spring. This DV is run on cars making alot more boost than you ever will with zero issues for years. Those that tell you there is risk of them falling apart and destroying a turbo are just trying to sell you something else. Its BS

dbf73

does the stronger spring make them unsuitable for stock boost cars?

Quadcammer

Do you have any proof of this? I ran a 710N on a car making twice the horsepower of the average 993TT, and it lasted all of about 3 months. Then I actually got a real bypass valve from procharger, but no one is springing for that on cars like these making only 1 bar or less

The 710N is fine, but its hardly what I'd call a high quality item.

No. Unlike wastegate springs which are opened by boost, these valves are open under vacuum. When you open the throttle and vacuum decreases, the spring slams this valve shut to allow boost to build. The problem with a stronger spring is generating enough vacuum to quickly open the valve when getting off the gas (to prevent compressor surge), but that is not typically an issue because of how much vacuum is generated by letting off the throttle (especially at high revs).

Run whatever you like. A stock car is probably fine with the stock parts or the 710Ns, but I am quite pleased with the EVO valves I have in my car.

Spartan

Twice the hp of a tuned or stock car? Well maybe a 800whp or 1000 whp car is out ot the league of a 710N but not on with a 993tt running stock or modified power. You should pull your evo's and and test them they are probably sticking

710n's have been used for years on cars making making 200 whp + more than 993tt's running 20-30psi. Every single VAG turbo car comes to mind (2.7t, 1.8t, 2.0t, etc). No reason for people to waste their money when an updated stock bosch part works better than the alternative

ca993twin

I have some form of billet diverter valves on Rufus... old age (mine) prevents clear recall. What sort of symptoms might one observe if the valves were sticking before going to the bother of taking them off and testing them? My boost gauge shows a very normal boost pressure when expected. Thanks.

ScottMellor

Steve, I think a faulty diverter valve can cause a farting noise.
Obviously you would never notice it .....