11-18-2012, 09:35 PM | #701 |
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Based on the firing order and the way the stock runners are paired. 1 3 2 4. 1 is paired right with two with a complete 180 for runner one. All that's going to do is push all the air into runner two and not flow out.
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11-19-2012, 05:30 AM | #702 |
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But that pairing gives even pulse widths. If 1 and 3 were paired the collector would see pulse, pulse, blank, blank. This way it's pulse, blank, pulse, blank, which gives even opportunity for scavenging. Doesn't it?
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11-19-2012, 07:22 AM | #703 | |
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Quote:
Update: I had the morning off today so I went into the shop where my stock header is and did a little scavenge test. Looks like I was right stock header is garbage. Doesn't scavenge from any cylinder. I'll take my header off sometime this week and do the same test. But for now I used a full race divided housing to compare. [ame="http://m.youtube.com/watch?v=q-2IHf9Eo1Q"]Stock FR-S BRZ and GT86 header. - YouTube[/ame]
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Last edited by Do Boy; 11-19-2012 at 10:31 AM. Reason: update |
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11-19-2012, 09:48 AM | #704 |
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Yes.
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11-19-2012, 10:02 AM | #705 |
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id like a 4-1 catted just to keep off the MIL and make up the tq
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11-19-2012, 10:24 AM | #706 |
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@Do Boy: that's not a very significant test, you're making a longer pressure wave in static conditions, there's no flow or waves coming from the other cylinders.
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11-19-2012, 10:39 AM | #707 | |
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I'm not claiming to be an expert. I am just re hashing everything I have learned over the years going from shop to shop. But all the fabrications shops here in Houston seem to all have the same method to testing their collectors. I could be wrong in all this. But all I am aware of and care is that the header I purchased made power. That's all that really matters to me.
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Last edited by Do Boy; 11-19-2012 at 12:39 PM. |
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11-19-2012, 10:53 AM | #708 |
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Anybody with just a little knowledge in fluidodynamics would understand that it's meaningless...
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11-19-2012, 10:54 AM | #709 |
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See post #3 in this thread, it contains the dyno sheets. Finding power is not the problem. They have just been busy on other projects.
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11-19-2012, 10:55 AM | #710 |
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So be it than. Guess I'm wrong. Good day everyone and happy holidays.
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11-19-2012, 12:16 PM | #711 | |
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Quote:
Wouldn't that have more to do with the collectors then the pairing, though? I'm not a header expert, but from my understanding you want the pulse widths to be even. |
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11-19-2012, 12:35 PM | #712 | |
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In the end, he was trying to make the point that the stock header doesn't scavenge very well, and I think he made it. A dynamic test may reveal something different, of course, but this is the best most of us could do with what we have on hand. I disagree with his conclusion as to why but that's why we have conversions. |
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11-19-2012, 10:49 PM | #713 |
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11-19-2012, 11:38 PM | #714 |
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21 months no dyno, 22 months no vendor dyno, 22months4rattles&leakssmh, amazing warped qualiy, y u no tag |
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