OBX RX8 Header
#376
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I'm showing 15 lbs for the RE header too, I think there is some weight in the main flange that can be removed, but IMO to get all the weight out you'd really need to remove the machined secondary air bar stock plate and use small diameter light gauge tubing for it instead. I think lighter gauge exhaust pipe tubing and the V-flange will be worth maybe 2 - 2.5 lbs in a similar configuration
I'm now even contemplating this, it would be significantly lighter still, I'm thinking at least half the weight of the aftermarket headers, basically duplicating the OE manifold for minimum weight:
https://www.rx8club.com/showpost.php...&postcount=108
I am in discussion with a fabricator who specializes in header work as you suggest, it's just too premature to discuss publicly at this point, not sure if it will prove feasible so I'd rather not get anyone's hopes up
Any chance you can loan me your OE manifold for a bit?
I'm now even contemplating this, it would be significantly lighter still, I'm thinking at least half the weight of the aftermarket headers, basically duplicating the OE manifold for minimum weight:
https://www.rx8club.com/showpost.php...&postcount=108
I am in discussion with a fabricator who specializes in header work as you suggest, it's just too premature to discuss publicly at this point, not sure if it will prove feasible so I'd rather not get anyone's hopes up
Any chance you can loan me your OE manifold for a bit?
Last edited by TeamRX8; 01-21-2006 at 09:53 PM.
#381
Hmm, well this is a dissapointment.. I was really looking forward to this product. I figured for about 280 bucks, a header that would have givin 3-4 hp would have bin kinda nice..
But that's obviously not always the case.
Toca Btw iv never seen the Rmagic or Feed headers?!? how is the design different? and how much whp are they claiming?
But that's obviously not always the case.
Toca Btw iv never seen the Rmagic or Feed headers?!? how is the design different? and how much whp are they claiming?
#382
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obx is a ricer product i knew from the start if wounldnt make power u can see the r magic at mazdaparts.com and just look op the feed 1 u find it after seen both that another look at re and u see how dif the design is
#383
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feed said 16 whp for the exhaust tune so i figure about 12 whp for that exhaust and cat pipe and 4 whp for the header that my guess this is with out there ecu tune. they said this was the power just by bolting al 3 up. r magic claiming r magic claiming 5- 6 ps
#384
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U Da Man
Originally Posted by Marietta 8
Ok, it's done. I'll have to post the sheet on Monday but the bottom line is that there was no gain and actually a small loss.
Thank you for testing this product for us all.... U DA MAN.
#386
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May be an old question--but has there been any OWNER before/after dyno's showing any gain with any header or highflow cat/midpipe ? I may have missed them but I haven't seen any. Even with the RP high flow cat. It seems some are getting some results with Turboxs midpipe(without cat) and cat back system(that system is too loud for me)--but that is all I have seen. Comments?
#391
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Originally Posted by olddragger
May be an old question--but has there been any OWNER before/after dyno's showing any gain with any header or highflow cat/midpipe ? I may have missed them but I haven't seen any. Even with the RP high flow cat. It seems some are getting some results with Turboxs midpipe(without cat) and cat back system(that system is too loud for me)--but that is all I have seen. Comments?
It is possible that the header itself does nothing if the exhaust then runs into a restriction like the cat, but add a catless midpipe to the header and you might get gains (area under the curve) over and above what you see with the midpipe alone.
i will add the disclaimer that butt dynos lie, hence this is opinion and speculation.
#392
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I agree carbonrx8--catless midpipe may show some gains--however for the majority going catless is not an option(either laws or the loudness). So for those in that group buy an aftermarket exhaust option for the sound you like Dont expect any great gains----yet. Thta dang shared middle port
olddragger
olddragger
#393
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Originally Posted by toca
obx is a ricer product i knew from the start if wounldnt make power u can see the r magic at mazdaparts.com and just look op the feed 1 u find it after seen both that another look at re and u see how dif the design is
The only really different header is the KnightSport, which keeps the flow of the center port split into two smaller tubes, with four tubes joining at the collector instead of three. It's been tested by knowledgable people and didn't turn out any better numbers than what you've already seen and heard here, again just bolted on without tuning. Tuning is going to be the only way to see a benefit, and the OE manifold can perform better with tuning too.
So it all really comes back to whether or not the Renesis can really benefit from a tube header at all. It would have been easy HP for Mazda if that was the case. Most cars have them now just for efficiency purposes. A well designed manifold similar to OE with some flow work may perform just as well or better on the Renesis, without the complication or cost. The only way to know for sure is to get on the dyno with a bunch of different designs and go at it. Applying generalized theory to a picture on the website or magazine won't cut it.
I can tell you without a doubt that's not how all those other header designs were developed. It's clear that they just took the tube for the furthest port and ran it as directly as possible to the collector, and then tried to make the other tubes a similar length by piping them around. Maybe at best they tried different diameter tubes, but that's about it.
Last edited by TeamRX8; 01-26-2006 at 07:41 PM.
#395
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Originally Posted by toca
rx8 did u hear me say that i belive they made that power no i just say thats what there claiming k
that's not how I saw it, IMO you claimed they were superior because of the design difference appearances. The RE header is a very high quality piece, better than OBX, but just bolted on it doesn't perform any noticable amount better, the only thing you get for the additional $1000 is non-CARB emission legality
#396
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Hmmm, all very interesting.
I'm going to be running, once my midpipe gets here, the OBX header, RX8Store.net catless/resonated 3" midpipe, and RX8Store.net 3" catback. It'll be fun to see what it's like to do all of this at once, straight from stock exhaust to all of that.
I'm going to be running, once my midpipe gets here, the OBX header, RX8Store.net catless/resonated 3" midpipe, and RX8Store.net 3" catback. It'll be fun to see what it's like to do all of this at once, straight from stock exhaust to all of that.
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Probably not unless I find a deal I can't pass up. IMO piggy backs are dumb, I'd prefer full standalone, and just leave the stock ecu to control the manifold BS.