Wastegates And Boost Controller

[R32NZ]

Sorry i dont know much abotu wastegates could someone explain to me how a wastegate works, ie: if you have a 12psi spring in your wastegate does that mean even if your boostcccontroller is set to 20psi, you only get 12 pounds of boost or how exactly does a wastegate work, does it slow a car down???

[StealthX]

The waste gate is a flap that opens to bypass some of the exhaust gas from the turbo. it has a signal line (an air line) from the intake piping, that fills with pressure when you come onto boost. when you reach the boost pressure your wastegate spring/boost controller is set at, there will be enough pressure to open up the wastegate, effectively stopping your turbo from boosting too much.

If you have a 12psi spring in your wastegate and just run a air line to the wastegate, your car will run 12psi. (all things being equal).

if you have a boost controller in there, it 'bleeds' off some of the air in the signal line, so the wastegate will take more pressure to open. i.e. 20psi instead of 12.

but its not advised to run 20 psi (some will say even 12) on a stock turbo, especially with no tune.

i see you have an R32, 20psi on a stock rb20 is a little risky too...

[R32NZ]

Well thanks for that information, btw i have a r32 without an engine atm XD, still buying an engine.

So say i get a stock rb26dett, i have an external wastegate fitted with a 12psi spring, and my boost controller is at 15psi. The wastegate would instead run 15psi?

so do wastegates make the car slower or what? and what about the BOV?

[StealthX]

okay then with an RB26, if its stock, it wont have an external wastegate.

both the turbos will have their own internal wastegates.

ditch the external wastegate man, you wont need it, unless your putting a big single turbo with different manifold(s) on.

just use the standard internal wastegates.

btw, wastegates and boost control dont make a car slower at all - wastegates are a need on every turbo car, not an extra thing that you put on.

dunno where you got that from, but a boost controller and wastegate is a means to control boost. the more boost, the more power, the quicker the car.

but you cant run more boost with out having it tuned of youl blow your motor.

as for the BOV, dont touch it. leave the stock one in. a BOV is a valve that opens up when you take your foot off the accelerator pedal, and vents the excess air that the turbo is still flowing out. has no performance benefit at all, except maybe a bit less lag between gears. a BOV helps keep the turbo healthy.