Diverter valve tech.

[500hpOnPumpEvo]

Just a thought on this
"Basically, a bypass valve exists to relieve a residual amount of boost pressure in a pressurized application when the throttle on the application is abruptly closed preventing the air from “backing up” into the compressor wheel of the turbo, slowing it down, thus creating “lag” when the throttle is reapplied. "

I agree with this, but also to...correct me if i'm wrong, doesn't the sudden surge back of the air also put added stress on the bearings in the turbo as the in rush of the surge hits the impeller blades, thus reducing turbo life?

[cij911]

Mike -- I seem to get "bucking" when ~3800 rpm ~ 10 - 13 psi part throttle conditions (e.g. going up a hill and just wanting to maintain speed). This is happening with the Blue spring installed - should I use a softer spring or a firmer spring ?

My setup is a stock 9 turbo with peak boost ~29 tapering to ~22 at redline.

[cfdfireman1]

Put the stock spring back on with the stock valve around it.

[cij911]

Originally Posted by cfdfireman1

Put the stock spring back on with the stock valve around it.

Sorry I am a bit confused with your response. Do you mean to replace the Forge with the stock DV or are you stating to place a softer (yellow spring) or something else? TIA

[cfdfireman1]

Dump the forge go with the stock IX valve. Forge valves are great for drag racing but for street or road course they suck.