[mn_vette]

I'm just wondering what the experts recommend. If you are using a T4 non-divided Turbine on your turbo what would be the proper pipe size that should feed into the turbo to maintain the best velocity and flow.

Are we talking a 2", 2.5", 3"?

I'm guessing for the size of the inlet there would be an ideal size pipe to mate to it.

Thanks

[Robert]

Originally Posted by mn_vette

I'm just wondering what the experts recommend. If you are using a T4 non-divided Turbine on your turbo what would be the proper pipe size that should feed into the turbo to maintain the best velocity and flow.

Are we talking a 2", 2.5", 3"?

I'm guessing for the size of the inlet there would be an ideal size pipe to mate to it.

Thanks

Well you have to be careful with your selection. Too big and you will increase the volume of exhaust gas but decrease the velocity of the gas. Too small and you get the reverse scenario. I've never actually been in a situation where I could fit any pipe I wanted into a vehicle for the hot side. Typically because of space or other considerations I recommended or used whatever would fit. Also most vehicles have a myriad of pre-built manfiolds out there to use. I'll loot into this for you though. i'm curious of the answer myself. I wonder if the turbo bible has a something on this. (Maximum Boost by Corkey Bell) In most situations I would recommend trying a couple different sizes and getting the results. This would be the scientific approach. That is you build one of various sizes and find the one that performs the best.

[mn_vette]

Through the black art of paintbrush editing I managed to come up with these drawings. The circles are fairly accurate, but not exact by any means.

2 inch pipe





2.5 inch pipe





3 inch pipe





2.5 inch ovalized







I seems to me that the 2.5" oval pipe would give you the least amount of turbulance in the transition. But this would still have a bunch as it goes from the pipe into the larger opening of the turbo and then back down as it is squeezed through the turbo.

What does turbonetics do with their kits??

[ash]

3 inch works the best
4 nicks in the tube , and it 'bends / moulds into t4 flange real good.



ash