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Compression braking with turbos?

VQST80

By VQST80,
in General Automotive Discussion

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VQST80 Apprentice

VQST80

Posted
Posted

Just curious as to the effects of compression braking with turbos?

Does the exhaust pressure spike when you come off the clutch?

A bit like a two stroke i guess?

Would the waste gate just dump excess pressue?

And can you use engine braking as much as an engine with hi compression or do you lose some of that?

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JCMarshall_Law Proficient

JCMarshall_Law

Posted
Posted

*** All evidence of my chumpness removed***

Compression braking is no problem at all, the exhaust pressure will only just be a bit higher than idling exhaust pressure (if you are off the throttle). The engine will be turning faster than idle - more fuel will be burnt so the pressure will be higher.

The wastegate will be closed when compression braking.

I cant see how the exhaust pressure would get anywhere close to the pressure when at full throttle and high RPM, it is burnt fuel that creates 99.999% ?? percent of the exhaust pressure - not the pumping action of the engine.

When you take away the fuel an engine is just a pump with a compression stroke.

JCMarshall_Law Proficient

JCMarshall_Law

Posted
Posted
insert SpaceBalls reference here...
u totally missed the joke...

Well don't I feel like a dickhead,

I prolly watched that movie 20 times when it came out as well :D

I have to edit my first post to remove all evidence of my chumpness,

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