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Thread: Headers Dyno Comparison Thread

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Posts: 81-90 of 158
2009-07-08 14:27:47
#81
Originally Posted by happynole
It also has a reverse megaphone.
I know the common names for some of these transitions are fuzzy, but traditionally a "reverse megaphone" is a transition from a larger pipe to a smaller pipe with respect to the direction of flow. A reverse megaphone is traditionally placed immediately after a (regular) megaphone. See this image for reference:

The last inch or so of that piece on the left is a reverse megaphone. The middle section is a megaphone, and the right section is the 4-1 collector.

If those are pictures of your header, it looks like you have a megaphone transition, but not a reverse megaphone. This is a good thing. You don't really want a reverse megaphone on a header unless you're dumping it, and you're running a full exhaust I believe?
2009-07-08 14:33:41
#82
Got mine (ASP) on the car yesterday, and I can feel the difference from 4700 UP. Out of VVL it feels a bit weak, but I beleive that's related to the activation point, I'll try to hit up the dyno today and see.
2009-07-08 14:48:17
#83
Macakin: Nice, post dyno sheet, when you are done.
2009-07-08 14:50:10
#84
Originally Posted by MR-4Door-SR20DET

^So you got this one Joe? My bad.


Yes, in fact that picture is of my header before it was shipped to me
2009-07-08 14:53:16
#85
Originally Posted by BenFenner
I know the common names for some of these transitions are fuzzy, but traditionally a "reverse megaphone" is a transition from a larger pipe to a smaller pipe with respect to the direction of flow. A reverse megaphone is traditionally placed immediately after a (regular) megaphone. See this image for reference:

The last inch or so of that piece on the left is a reverse megaphone. The middle section is a megaphone, and the right section is the 4-1 collector.

If those are pictures of your header, it looks like you have a megaphone transition, but not a reverse megaphone. This is a good thing. You don't really want a reverse megaphone on a header unless you're dumping it, and you're running a full exhaust I believe?


Yes, I have a full exhaust.

I need to remember the multiquote button. Sometimes computing > happynole
2009-07-08 16:01:20
#86
Originally Posted by BenFenner
I know the common names for some of these transitions are fuzzy, but traditionally a "reverse megaphone" is a transition from a larger pipe to a smaller pipe with respect to the direction of flow. A reverse megaphone is traditionally placed immediately after a (regular) megaphone. See this image for reference:

The last inch or so of that piece on the left is a reverse megaphone. The middle section is a megaphone, and the right section is the 4-1 collector.

If those are pictures of your header, it looks like you have a megaphone transition, but not a reverse megaphone. This is a good thing. You don't really want a reverse megaphone on a header unless you're dumping it, and you're running a full exhaust I believe?


It's called a reverse cone, and I don't see a megaphone or a reverse cone on Joe's setup. Looks like a nice transition piece to me.
2009-07-08 16:25:15
#87
Originally Posted by macakin
Got mine (ASP) on the car yesterday, and I can feel the difference from 4700 UP. Out of VVL it feels a bit weak, but I beleive that's related to the activation point, I'll try to hit up the dyno today and see.


hope u do good man ...post a video if u can
2009-07-08 16:39:12
#88
Originally Posted by myprojectb13
I don't see a megaphone or a reverse cone on Joe's setup. Looks like a nice transition piece to me.

Like I said, the common names for these parts/transitions are so fuzzy and imprecise...

Could you tell me what the difference is between a traditional "megaphone" and what you're calling a nice transition? As far as I can tell, there is none, unless you're talking about the angle of transition. I think a 7 degree angle is ideal (or something around there) so is that what makes a transition a "megaphone", having the perfect angle of transition?
Or?
2009-07-08 19:05:35
#89
Originally Posted by BenFenner
Like I said, the common names for these parts/transitions are so fuzzy and imprecise...

Could you tell me what the difference is between a traditional "megaphone" and what you're calling a nice transition? As far as I can tell, there is none, unless you're talking about the angle of transition. I think a 7 degree angle is ideal (or something around there) so is that what makes a transition a "megaphone", having the perfect angle of transition?
Or?


Megaphone:Megaphones

If you can't tell by the pictures, words won't help.
2009-07-08 19:16:49
#90
You're kidding right?
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