The Official "RX8 in DSP" Thread - Page 25 - RX8Club.com



RX-8 Racing Want to discuss autocrossing, road-racing and drag racing the RX-8? Bring it here. This is NOT a kills/street racing forum.

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Old 08-10-2017, 01:20 PM   #601
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Well maybe it's not clear to you. The collector is slip-on/removable in the SpeedSource pic. It looks to me like someone took the original short collector off and welded the longer choke collector on at that same position. Just an observation, not a criticism.
Maybe my pic wasn't clear - ours is slip fit too. That big piece is all a merge collector. It was a good enough deal that if we pick up a couple horsepower I'll be thrilled

I'm not taking your feedback as criticism, keep it coming. I'm curious to learn about what I impulse bought Ultimately the dyno will be the proof of how good it is or isnt.
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Old 08-10-2017, 01:21 PM   #602
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Here's a pic from the fabricator website from back in 2015 (now NLA) and a reply from my inquiry then. They didn't have any jigs etc. so the only way to get another one was to take an RX-8 to their location in Indianapolis. I believe they're now called Cozzolino Motorsports, but not 100% sure




From Pete C: The header pictured was a custom piece we were building for a customer that was racing the grand am series. Labor was around 500. They were built out of 321 so the material cost was pretty high.
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Old 08-10-2017, 01:22 PM   #603
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Get rid of that collector and do what I said earlier, except 2.5" outlet then

Again from my original assessment in 2006, length has nothing to do with it, but it doesn't hurt anything either

and this translation is from RS Pantera in Japan from when they built some special RX-8 headers with 2" primary pipes in 2012 basically reaffirming what I keep trying to impress on RX-8 owners about a zero-overlap timing engine exhaust:


Quote:
There is no point in making all three equal lengths from the concept of zero overlap, and our company is taking the layout of Renesis only with our own idea.
Pipes with large F R exhaust diameters and large flow rates are assumed to be perfectly equal length, actively utilize "exhaust" of exhaust by different cylinder exhaust, the center pipe is unequally long and drawn out at the shortest distance, the same effect To obtain from the same cylinder.
We also tested the partition of the center housing, but because there is no "overlap", the effect can not be expected and it is judged to be "exhaust resistance only", it is also disadvantageous in weight, so it is not adopted.



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Last edited by TeamRX8; 08-10-2017 at 01:31 PM.
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Old 08-10-2017, 01:24 PM   #604
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The smallest point it pinches to is 2.5". What would we change? I guess we could chop off the trombone portion that expands to 3", but not sure it matters? We are going to reduce it back to 2.5" right after the header basically, is the plan.
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Old 08-10-2017, 02:02 PM   #605
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Ok, I thought the very end was 2.5", you can just ignore me then but yeah, just remove the 3" part and tie it in with another slip joint there to your existing 2.5" pipe
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Old 08-11-2017, 03:53 PM   #606
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My car is an ex Koni Challenge car and it has the same collector I think.


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Old 08-11-2017, 09:34 PM   #607
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Hmm, never saw that one before and now there are two, just the short one :
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