Boeuf

iTrader: (2)

Maybe a dumb question, but for those of us with catted BHR midpipes, would it still work with the header and modification?

Mr_Pieper

I think there would be a space conflict as the collector is where the cat would be.

BigCajun

iTrader: (1)

Good to know.
So just for a hypothetical discussion, if someone were to run this header on a mostly stock engine, what would be the result of running it without the cat OR sensor?

Mr_Pieper

You didn't get the email full of information and fancy dyno scribbles? It's good stuff for your situation.

BigCajun

iTrader: (1)

Ok, thanks, I didn't see the bung & thought it was deleted all together.

DVerdeyen

iTrader: (1)

The wait is finally over and they're out! Good luck to anyone getting them, hopefully they're as good as anticipated! I've put some aside waiting for them, but $1625 is out of budget since I'm a student. Guess I'll just read about em and dream..

:frown:

Posted From RX8Club.com Android App

logalinipoo

Charles, did you test them on multiple rx8's to see the gain

BigCajun

iTrader: (1)

I am pleasantly surprised at the price.
It's not as expensive as I thought it would be.
I'm also happy the gains mentioned are with the stock exhaust.
My main concern now is the sound, both tone and volume.
Is anyone planning on getting one right away?

BigCajun

iTrader: (1)

His description says "a few RX8s with similar gains".

Any first impressions?

nycgps

iTrader: (1)

I just bought couple grand of stuff so I might hold this until December or Next Jan before I can get it.

**** I'm so excited now.

BigCajun

iTrader: (1)

Yeah, me too.
I'm going to wait a few months at least for reports of sound quality, and see if anyone has any negative experiences.

logalinipoo

Sounds good man, if it would fit with my turbo id consider it. Fingers crossed ill pickup a used one for a good price and put a 3" flange for my turbo down pipe.

noredline

Congrats to BHR! I must ask, are there any issues with heat? I would imagine that puts out more heat than the poopy stock manifold. Also (maybe I missed it) but what is the weight comparison to the stock manifold/cat assembly?

nycgps

iTrader: (1)

Yes Sir, I will get one asap

oh, have you got my email?

N0P1st0ns

Great job Charles! I do have one question thou. I read the product description and i couldn't find a definite answer to if this will bolt onto an existing midpipe? Such as racing beat, turbo xs, BHR or the OEM? Maybe its just not in perspective but the midpipe offered with the header looks smaller than a regular midpipe. Thanks. i apologize for my ignorance haha.

9krpmrx8

iTrader: (46)

Jesus, what is so hard to understand about the midpipe? No it won't bolt up to your existing midpipe.

BigCajun

iTrader: (1)

In case he's busy & can't reply, it won't.
There is an option to buy it without the short midpipe for $100 less, but it would have to be a modified midpipe to fit.

N0P1st0ns

No need to be a smart ***... Can no one have questions? Just because some people arent as knowledgeable as you, doesnt mean you need to sling around your little attitude.

wackemandstackem

I have read through almost this entire thread. I am impressed with the dyno numbers posted for the long tube header compared to stock. I am just curious if someone can explain the science behind why the longer tubes produce greater hp verses short tubes. Or is there something more than just longer tubes?

RIWWP

iTrader: (2)

The question keeps getting repeated in various parts of the forum. He is simply struggling to see why people don't connect the fact that this header is significantly longer than the stock header with what that does to the existing midpipe. If the header is longer, it means the output is moved farther rearward, which means that there is a shorter distance between the header output flange and the catback input flange. Even half an inch would cause fitment problems, and this header appears to be significantly longer, perhaps 12-18 inches longer. So a 3ft midpipe can't fit in a 2ft space (or whatever the resulting measurements are). As a result, two of the header options for purchase also include the shorty midpipe to finish the distance to the catback flange, replacing the existing midpipe/cat/whatever.

The exact science isn't 100% known. If it was public knowledge, than there would have been a header this successful before now.

Charles has indicated that there have been many iterations, and that each change he made to it produced a change in the output, including a few times he has noted that "one change made produced as much more gain as other popular headers have in total." Presumably this one change is not the length of the header, though it may be.

I doubt that Charles will publish the exact R+D he spent his time and money on, so you may never get a straight answer as it is unlikely that anyone else will take the time, trouble, and cost to figure it out and then publish free of charge.

wackemandstackem

I don't expect to learn trade secrets about this particular header design. I am more curious as to how Exhaust scavenging is different between different lengths of headers. I do notice that the collector is longer than most with a nice taper, which almost always moves more exhaust. I wonder how the absence of the air pump feed rail effects flow. I suspect exhaust turbulence happens on aftermarket headers as some gases travel from port to port.

nycgps

iTrader: (1)

Google has your answer

not trying to be a Smart *** like 9K (*cough*lol*cough*) , but seriously, u can find answer(S) by a simple google search, u are not gonna get 100% what you need to know, but it will give u a general idea why is this happening.

N0P1st0ns

Thank you, i understand it now. it just wasn't all put together in my head. Thank you for your mature response.

RIWWP

iTrader: (2)

Traditional rotary wisdom is that there "is no scavenging on rotaries". However, that being said, it is possible that Charles found something with the overall length, and the equal length of all 3 runners, that does actually leverage resonance and pressure differentials to assist in exhaust evacuation.

Note that I'm not saying that scavenging exists, merely that I am open to conventional wisdom being wrong

skc

Is the exhaust pipe diameter in the long tube bigger than the short tube versions?