Your turbo can spool up to 100K RPM when at high boost. When you let off the gas the turbo feels like it hits a brick wall. There is no where for the air to go but back into the turbo. This slows it down and also applies a twisting affect. The surging air tries to back spin thecompressor while the exhaust is spinning the turbine in the correct direction. This causes a twisting affect on the turbo shaft which causes it to fail after some time.
Also, when you get back on the gas, the turbo has to come back up to speed being that the surge slowed it down.
Now a BOV goes inline between the turbo and the throttle. WHen the throttle closes, the BOV opens venting the air to the atmosphere. So as you can see the turbo is happy because the pressure is relieved.
The stoc setup on the car comes with a surge valve. Instead of ventin tit, it recirculated it back into the intake. The stock surge vvalve is not able to accomidate for the extra volume of boost. So if you install a manual boost controller or an electonic one, you will need a BOV so the turbo stays happy.
When I cranked up the boost on my srt-4, i noticed how quick the boost would come back online after a shift due to the larger BOV i installed. There was no longer that small pause fo rthe turbo to get back up to speed.
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E.D. 3\" Turbo Back, , HKS SSBOV, GReddy-e01 Boost controller, Greddy E-manage fuel management, Blitz Turbo Timer, JE pistons, Ported Head, E.D. Large Frontmount Intercooler, E.D. Tubular manifold with t3/t4 (prototype), IPP coilovers, Limited Slip.
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