$2500 Turbo Kit update 11/2/08

[gboezio]

[pinoypizzaboy]

Originally Posted by gboezio

im a noob at this.. but wich part do you attach the blow off valve? thru the intake piping or exhaust part?

[4MPG]

Originally Posted by pinoypizzaboy

im a noob at this.. but wich part do you attach the blow off valve? thru the intake piping or exhaust part?

The BOV is placed after the turbo, in the compressed air (turbo to engine) section. The purpose of the BOV is to both help regulate maximum pressure in the intake (so it can be set to xxx max PSI) and to "blow off' whenever you lift off the throttle.

If you didn't have a blow off, or didn't have one properly sized for your application, on top of not being able to regulate the boost pressure you would get an effect called compressor surge. Basically when you snap closed the t/b blade (let off the gas) you have alot of pressure that is built up in the intake piping, and it has nowhere to go but back thru the turbo itself. This is generally pretty hard on the turbo, and can lead to bearing failure etc etc.

[Tamago]

Originally Posted by 4MPG

The BOV is placed after the turbo, in the compressed air (turbo to engine) section. The purpose of the BOV is to both help regulate maximum pressure in the intake (so it can be set to xxx max PSI) and to "blow off' whenever you lift off the throttle.

If you didn't have a blow off, or didn't have one properly sized for your application, on top of not being able to regulate the boost pressure you would get an effect called compressor surge. Basically when you snap closed the t/b blade (let off the gas) you have alot of pressure that is built up in the intake piping, and it has nowhere to go but back thru the turbo itself. This is generally pretty hard on the turbo, and can lead to bearing failure etc etc.

blow off valves do not regulate maximum air pressure

this is handled by a wastegate

and generally low boost applications don't require a BOV..