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PostPosted: Sun Oct 18, 2020 11:20 am 
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Turbo EFI
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Joined: Fri Dec 30, 2005 2:49 pm
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Location: Houston, TX
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I'm design a new header for the Race Dart that will go directly from the head to a T3 flange. My preference is to keep it as compact as possible and not worry about keeping the individual runners equal length. I assume the whole idea of phasing your exhaust pulses becomes pretty unnecessary because the back pressure is dominated by the effect of the turbo, but I don't really know. We're using a pretty damn big turbo (WH1C), and spool-up time is a concern. Would there be a significant benefit to matching the runner lengths?

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PostPosted: Sun Oct 18, 2020 11:28 am 
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Turbo Slant 6
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Joined: Sat Sep 13, 2014 8:25 am
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Location: Springtucky OR
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It's my opinion that header lengths don't really matter. As you said, the drive pressure negates any scavenging effect from the header pipes. As I recall, if your turbo has a twin scroll turbine housing it's beneficial to feed 1,2 & 3 into one side and 4, 5 & 6 into the other.

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PostPosted: Sun Oct 18, 2020 1:28 pm 
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Joined: Mon Oct 21, 2002 11:08 am
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Location: Blacksburg, VA
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Yep, I would not worry. Clustering cyls like Procycle says could help if you have a two-hole hot side input flange on the turbo.

Lou

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PostPosted: Mon Oct 19, 2020 11:31 am 
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TBI Slant 6

Joined: Thu Apr 18, 2019 7:57 am
Posts: 157
Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
The exhaust in a turbo car is at much higher pressure than in a normal header, and so the velocity is a lot lower. I haven't seen many dyno results firsthand, but I've heard turbo engine builders claim that the primary concern they have with header design is short tube length over equal length or even tuning the tubes to an optimum length.

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