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Turbo v6 exhaust size???????????

Blakvsexec

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My turbo has a 3" v-band outlet, should i continue it at 3" all the way through

or

Should i reduce it back down after the dump pipe

I know on diesels the exhaust should be free flowing on a turbo engine but is it the same for a petrol engine???


Cheers
 

2DIE

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I think twin 2.5" or a single 3" should be fine from reading about 100 of these posts :p
 

Blakvsexec

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A twin 2.5 is bot possible as i am only running a single turbo and only have a single outlet
 

delcowizzid

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soop

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Turbo exhausts have totally different princible's.

Run a single 3" as a minimum.
Or depending on boost and HP, 3.5" tapering to a 3".
 

delcowizzid

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still just the same principle i went from 2.5 to 3" and lost low down torque cruiseing but gained heaps 0-100 at full throttle you still get a trade-off just like N/A and with some extra timing you can make up for the torque loss down in the cruise area
 

soop

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Totally depends on the turbo really.
Better idea is to go 3" tapering to 2.5 if you're only running a mild setup.
Also, the Dump pipe design is critical. I've seen some **** dump pipes being used on Commodores.
 

delcowizzid

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7psi you strangle the **** out of them with 2.5" exhaust ive been looking at 3.5" or 4" for a while now to open it up some but 3" is good for 11's so far see what difference it makes straight out the dump in a month :D
 

soop

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Becarefull that it doesn't surge like a mother with no exhaust on it ;).

How have you delt with the waste gate, is it internal or external?
 

delcowizzid

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it has good enough fuel in it that it could surge to 18psi and survive pretty well on its own :D wastegate cheap as chips chinese special 38mm never spiked in its life
 
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