Equal length turbo header

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sidemarkers
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Re: Equal length turbo header

Post by sidemarkers » Tue Dec 26, 2017 2:58 pm

I've seen equal length merged headers on naturally aspirated street dubs. To think that it might be just as beneficial on a turbo making 20 lbs of boost is odd?

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Wally
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Re: Equal length turbo header

Post by Wally » Wed Dec 27, 2017 3:58 pm

sidemarkers wrote: ↑
Tue Dec 26, 2017 2:58 pm
I've seen equal length merged headers on naturally aspirated street dubs. To think that it might be just as beneficial on a turbo making 20 lbs of boost is odd?
Nope: tests (on several watercooled japanese models) by a rather well-known turbo header builder revealed that equal length made more hp all over the rev range as opposed to a log style unequal length header.
There is also sound theory behind it, based on most of the N/A exhaust events like you mention iirc.

I strongly believe in equal length, even more then exhaust length on a turbo for quicker spool.
Still, its difficult wrt space constraints as we all know, but if you have a choice...i'd go for EL.
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petew
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Re: Equal length turbo header

Post by petew » Wed Dec 27, 2017 7:33 pm

Wally wrote: ↑
Wed Dec 27, 2017 3:58 pm

Nope: tests (on several watercooled japanese models) by a rather well-known turbo header builder revealed that equal length made more hp all over the rev range as opposed to a log style unequal length header.
There is also sound theory behind it, based on most of the N/A exhaust events like you mention iirc.

I strongly believe in equal length, even more then exhaust length on a turbo for quicker spool.
Still, its difficult wrt space constraints as we all know, but if you have a choice...i'd go for EL.
See I believe that, but i'd ask these questions...
1. How much more power across the range?
2. How much extra cost?
3. How much extra space?

Which is why log/unequal length systems are more popular.

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