Wastegates and blowoff valves

[knightinwhite86]

I have a question that I was hooping someone could answer. Are wastegates and blowoff valves the same thing? And if not, what are the differences?

 

[Jay]

no,

this is a bit of a basic explaination

wastegates regulate boost, it bypasses excess exhaust gases once the set boost level has beent reached, the boost can be adjusted by tapping into the line that goes to the wastegate acuator from the use of a bleeder valve or stepping motor

blow off Valves release boost when you come off the throttle for better resonse, less lag and greater turbo life (allows the turbine to continue spining)

 

[Duke]

Originally posted by VIPERGTSR01
blow off Valves release boost when you come off the throttle for better resonse, less lag and greater turbo life (allows the turbine to continue spining)

As our friend said above. They also relieve stress on the intake system so that you don't deadhead the 10-20psi intake stream when the throttle plate closes while the turbine is still pressurizing it.

 

[Jay]

also you can get internal and external wastegates, most production cars come with internal wastegates, they are built into the turbo

here is a pic of a internal wastegate

 

[Jay]

and here is a small pic of a external wastegate

 

[TS1AWD]

External Wastegates are fun Especially my HKS one that vents to the atmosphere. very very mean sounding.

 

[knightinwhite86]

Ok, I knew what a blow off valve was, but I didnt know what a waste was, thanks. Now do you run one or another, or both?

 

[Jay]

most turbo cars have both, but some cars like the GA70 supra (second gen) (with the 1G GTE engine) doesnt have a blow off valve. but they must have a wastegate to regulate boost

 

[360rider]

Originally posted by VIPERGTSR01
also you can get internal and external wastegates, most production cars come with internal wastegates, they are built into the turbo

here is a pic of a internal wastegate

Is that the Rotary symbol on the center of the turbine?

 

[Jay]

its not suppose to be a rotor, it just they type of locking nut they use

 

[BeN_SpeC2]

thx vipergts...i didnt know that either....i thot they were the same

 

[Jay]

no problem