[Rogue_Ant]

Ok, I'm in the process of rebuilding my Tsi....
I Have a turbo that is about the same as a T-62.
I do have supporting mods...but my question is what diameter of pipping should I use for my Header?

I'm expecting power to be from 5000rpm+


Any info/calculations would be helpful.

Rogue

 

[turbolover2]

Usually, smaller is better. It will increase the velocity of the exhaust gases, helping spool.

From Maximum Boost:

"Almost all applications of a turbo are to an existing engine. Therefore, choice of tubing size will usually be dictated by port size and the size of the turbine inlet on the turbocharger. Where a clear-cut choice does not exist, it is best to select the smaller of the sizes available, thus increasing exhaust gas velocity."

 

[Rogue_Ant]

I understand smaller will increase velocity, but I don't want to 'choke' my engine in the higher RPMs.

Remember I'm expecting power from 5000 to 8500(or so).

Rogue

 

[Blackboost]

Moved to Parts Talk...

 

[dsm1995gst]

Piping.

 

[marshall]

i'm guessing you mean primary tubes, not piping.

1.5" OD is pretty much ideal. 1.625" OD is borderline, 1.75" OD is too big, especially if the car is going to see the street. of course this is assuming you aren't using crazy thick material, stick to around 1.5" ID tubing and you'll be set.

marshall

 

[Rogue_Ant]

Moved to Parts Talk...

Considering I was asking for info and math behind turbo header design, not the size of a specific header or manifold.
I'm wondering why this was moved to Parts....

Rogue

 

[Rogue_Ant]

Piping.

Thanks for the info....

Rogue

 

[Rogue_Ant]

i'm guessing you mean primary tubes, not piping.

1.5" OD is pretty much ideal. 1.625" OD is borderline, 1.75" OD is too big, especially if the car is going to see the street. of course this is assuming you aren't using crazy thick material, stick to around 1.5" ID tubing and you'll be set.

marshall

Thanks for responding to my question.
No what math did you use to get those #s?
Or what reasoning?

Rogue

 

[marshall]

based on experience and people i've talked to - especially geoff at full-race, he was extremely helpful while i was putting together my manifold.

marshall

 

[Rogue_Ant]

Do you have a contact # for Geoff?

Thanks

Rogue

 

[marshall]

not off hand, check out www.full-race.com, the number should be on there somewhere

marshall

 

[khendriksma1]

As far as headers go, is it advisable to use one for a car running a T-28 or is that a lot of overkill? Should I stick with the stock manifold? I was considering buying a stainless header with equal-length runners.