Turbo header primary pipe size

[racoguy]

Whats peoples thoughts on primary pipe diameter for a 2000cc turbo?
Too large will loose flow, too small would choke?
Max length of pipe work?
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[clonebug]

Do whatever you need to make it work.
If it's a street car anything is better than no turbo at all.

I use an El-Cheapo Sedan header with a piece of 2 inch tubing from the header flange to the turbo inlet.
Could it be better??? Maybe....but it's not that bad the way it is.

I don't think the header is going to make that big a difference unless you are trying to get every tiny bit of hp to win the race.
Use what you have and run it.
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[oprn]

Right on the money!

I would guess 1 1/2" is as large as you need to go. Just fit them up with the shortest route to the turbo, don't worry about making them equal lengths as turbos really don't care. Keeping the velocity and temperature high is more important.

[FullFender]

I've read here on some ancient posts that smaller pipe spools the turbo quicker, is there any truth to this?

[madmike]

No smaller tube will not make it spool faster,,,Ball Bearing Turbo will
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76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
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[Lo Cash John]

Yes, smaller tubes will spool the turbo faster.

If you've got the money for it, get a ball bearing turbo as they spool up really fast.
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[Stripped66]

1 1/2" primaries, as short as possible.

How fast your turbo spools will critically depend on choosing the correct size turbo. Know what your goals are, be realistic about those expectations, and size the turbo accordingly.
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[kangaboy]

I have an 1 5/8" header on my 1776 with a Garret GT17...spools fine.
I think picking the correct size turbo is far more important than the correct size pipe. As long as you aren't sticking a 1/2" or a 4" collector on it, I think you will be fine, and the difference between say a 1 1/2" and 1 5/8" piping will be unnoticeable.
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[Bugsy61]

Inch and a half, or inch and 3/8 will both work fine. If I lived in New Zealand, I'd order a K03 ($100 on ebay) and a K04(also $100), have them both shipped in the same box to save on shipping. Try them both, keep your favorite, and sell the other one for a profit. K03 makes 200 HP on Audi 2 liter engines. What are you duty taxes on imported parts?