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Originally Posted by olddragger
(Post 1951126)
17 hp from exhaust system? But that is with a race/high flow cat --right? Plausible!
Curious with what you have done with the center port--can you give us another picture showing the header ports? if not then I understand--have to guard development secrets. Important step toward that hp goal of yours and i am following closely. If that goal is obtained (and I am optimistically cautious:)) then i will not need to go FI. header looks good for prototype. Are there air holes for the air pump present? olddragger /Lasse |
Originally Posted by peterisurhero
(Post 1951276)
oooooooo okay:). sounds good man. as long as it really works. im first in line!!!
/Lasse |
looking good man--looking good.
olddragger |
Originally Posted by Wilson
(Post 1951023)
(Yes RG, some of us pay attention)
The exhaust ports themselves are much smaller in area than the exhaust runners are which is why I think 2.5" is fine if done properly. If you go purely off of runner area, a 3" is about right. Unfortunately Mazda can't seem to get port area and runner area matched up very well. Even if a 2.5" makes slightly less top end power, I'll bet it makes more average power everywhere else. Someone go test that statement and report back. |
hey lasse, i'll be your guinea pig with the header:) hAHAHA
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Originally Posted by rotarygod
(Post 1951472)
LOL!!!
The exhaust ports themselves are much smaller in area than the exhaust runners are which is why I think 2.5" is fine if done properly. If you go purely off of runner area, a 3" is about right. Unfortunately Mazda can't seem to get port area and runner area matched up very well. Even if a 2.5" makes slightly less top end power, I'll bet it makes more average power everywhere else. Someone go test that statement and report back. Lets ask Lasse since he seems to have all the needed equiptment? Have you tested out a 3" exhaust as well as the 2.5" that you are currently using? What about a 2.75"? |
I can say that i have not tested any 2.75" or 3" on my N/A RX-8. But it can be easily done i just have to ask Ferrita and they will make a bigger bore exhaust. Maybe i'm gonna test the 2.5" and a 3" prototype on Lennarts RX-8 race car on my RotoTest dyno? Lennarts RX-8 has a Procharger kit from DNA on his stock block Renesis engine that is pumping out 326 hp at rear wheels on a DynoDynamics hub dyno. Should be interesting to see the results!
/Lasse |
Is this being sold as a full exhaust system? Price estimate yet?
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After 1.5 months any updates Lasse?
Cheers jird20 |
This looks promising for all us normally aspirated guys. Is that a big dent I see in the front runner? :rolleyes: I'm more curious about dropping weight. Any target weight reduction numbers verses stock weight?
http://www.molnsatra.se/bil/header.jpeg |
Well one thing i can say for sure is that i am still waiting for Peter G to get his hands dirty on manufacturing the headers! I talk to him last Monday and then he said he should "only" do some Ford Cosworth turbo headers. This means that hopefully he can start with my headers late next week. I am not gonna comment or write anything more about the header before he makes the first one!Then i will post some pictures. About the weight i think it will be around 2 lbs lighter than stock.
/Lasse |
Oh, this sort of header thing could be beneficial to Remote turbo setups like mine :)
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:rolleyes:
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Originally Posted by Charles R. Hill
(Post 2014256)
Headers may not be of any benefit to N/A apps but definitely to F/I or nitrous apps. I already have a p.m. out to Lasse about a 3"-collector version.
:D: |
I wonder what this type of header does for the exhaust note? I really do not want a raspy sound. I want a deeper sound.
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^ Yes I know, but that post confused me because it says (no header) when he did the dba test. ??
Originally Posted by Lasse wankel
(Post 1885390)
Yes there is a little deeper throatier tone not much but it's there! I think when i measure the sound with a db meter 20 inch 45degree backwards the exhaust it was like 82-83dbA. That was with only the complete exhaustsystem (no header)
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I'm the only one interested it seems, so send me one for Christmas please :)
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Any problems with tuning?
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dyno late august????
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for the 1 billionth time, a multi-tube header is worthless on a zero-overlap timing Renesis
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english please
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I'm more interested in weight savings and sound changes
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update?
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Originally Posted by rotarygod
(Post 1951472)
LOL!!!
The exhaust ports themselves are much smaller in area than the exhaust runners are which is why I think 2.5" is fine if done properly. If you go purely off of runner area, a 3" is about right. Unfortunately Mazda can't seem to get port area and runner area matched up very well. Even if a 2.5" makes slightly less top end power, I'll bet it makes more average power everywhere else. Someone go test that statement and report back. Slight thread hijack here but hey! Just flicking through the exhaust threads for some tips on making up our exhaust system to mate to our own headers, and picked up on this, nice to see someone confirmed my calculations, I was getting a bit worried I'd gone too small seeing all the big bore systems on here! :) |
is this header still in the works
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