What flows better?

**Jamo** · 24 February 2012, 18:30

Great stuff Hap I will follow suit how far down the exhaust does the wastegate rejoin
I want to run 1.75 or 2 inch for the wastegate

**urs4guy** · 24 February 2012, 18:56

Originally posted by Jamo

Great stuff Hap I will follow suit how far down the exhaust does the wastegate rejoin
I want to run 1.75 or 2 inch for the wastegate

It joins up right before the down pipe makes the second turn to parallel the ground.

Hap, wit dakine waste news not from Evahboost, Maguire

**Costash** · 24 February 2012, 20:22

There is any problem if I am running 3.5'' on to 3'' on downpipe?

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**Billman** · 24 February 2012, 21:11

Regarding flow no because the further you go from the turbo the colder the gas is thus meaning they require less space (have less volume).

**cooperquattro** · 24 February 2012, 21:19

Originally posted by Jamo

Say 650 bhp

a bit aptimistic ehh!!lol only joking
this is for future tuning????
i wish i had built for more power in the first place instead of 2 or 3 attempts

**Jamo** · 24 February 2012, 21:44

Yeah im looking a 390 bhp

**Henkjan** · 26 February 2012, 12:48

Originally posted by EspenW

Oooh, good stuff, I haven't calculated pipe flow and friction factors since the mid 90's. Gotta dust of me olde Fluid Dynamics books.

same here

Originally posted by urs4guy

.... What is the loss, if any, from dumping a 3" outlet into a 3.5" pipe?

that would be a lot more than connecting a 3" first and then a nice expansion to 3½"

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