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Old 09-03-2014, 08:25 PM   #61
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So, would the JR header be around the same gain as well?
Ever since I found out that JR has a CARB EO for their new Rotrex kit, Ive been thinking about that header.
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Old 09-03-2014, 08:57 PM   #62
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So, would the JR header be around the same gain as well?
No, it isn't.

Since you're new here, I'll be nice.

Bottom line seems to be to buy the RB header...
(That's me, paraphrasing about a year worth of header threads/etc/along with SEARCH RESULTS since owning a Miata.)

While the JR is CARB legal, pretty sure I wouldn't want to dirty my hands to install one.

And, ya know... try searching
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Old 09-04-2014, 05:11 AM   #63
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No one post by one person. My personal experience is that we have tried all sort of stuff on the exhaust side and found that a OTS Racing Beat header, race pipe (test pipe), midpipe and single tip exhaust flow about as much as a $2500 hand built bundle of snakes work of art header/exhaust. For fun, we tried a straight pipe. Yep, made less power than the OTS RB exhaust. While a one off Stahl or Boig big tube header for a 9000rpm 14:1 EP motor that idles at 2000rpm will likely be more effective that the OTS RB system on that example, everything else we have tried has come up with no real gains. This from a bone stock 102whp NA8 to a 400whp supercharged car and most points in between.
Sounds like RB nailed the collector and tube lengths. I gotta toss out the e-bay tri Y header my car came with and see what gains can be had running a RB. Don't need a Tri Y header on a race car.

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Old 09-05-2014, 12:44 AM   #64
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Emilio,

Did you do any testing without the venturi fitted in the Maruha? It seems to work well on a stock engine, but I wonder if it chokes things up on a more modified engine with compression, cams, ITB's, etc. I was going to pull mine out and maybe re-dyno. Curious as to what your thoughts are.
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Old 09-05-2014, 12:50 AM   #65
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Quote:
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Emilio,

Did you do any testing without the venturi fitted in the Maruha? It seems to work well on a stock engine, but I wonder if it chokes things up on a more modified engine with compression, cams, ITB's, etc. I was going to pull mine out and maybe re-dyno. Curious as to what your thoughts are.
How small does the choke get again? IIRC pipemax was saying 2" choke was good for a header on stock cams aiming for a 4k to 8k powerband.
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Old 09-05-2014, 12:25 PM   #66
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How small does the choke get again? IIRC pipemax was saying 2" choke was good for a header on stock cams aiming for a 4k to 8k powerband.
It reduces to 50mm, so a hair under 2". I have TWM 48mm ITBs, 264' 10mm lift cams, 02 block, 7800 rpm rev limit, and a .060" shaved BP4W head yielding ~11.5:1 compression. The engine feels like it wants to make more top end. I was going to pull the venturi and see how it feels, but if Emilio tested this then I don't want to waste my time with it.

Blue Line: Stock 02 Block, Stock BP4W Head, MSM Intake Cam, TWM ITB's, Maxim Work's header, 2.378" ID Exhaust

Green Line: Stock 02 block, .060" Shaved BP4W Head, SUB's, Maruha 264' 10mm lift cams, Supertech Valvetrain, Toda Cam Gears, TWM ITB's, Maruha Header, 2.378" ID Exhaust, Aluminum Water Pump and Alternator Pulleys

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Header comparison RB, Maruha, Maxim-quinnitb264cams_zps9e8b0145.jpg  
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Old 09-05-2014, 12:27 PM   #67
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Your car looks like it has more power in it if you just increase the redline. But I would need more specs on the cams if you wanted me to pipe max it.
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Old 09-05-2014, 12:47 PM   #68
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The Maruha has optional venturi inserts 45, 50 and 55mm. The BP header ships with 50mm standard.
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Old 09-05-2014, 01:51 PM   #69
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Originally Posted by Leafy View Post
Your car looks like it has more power in it if you just increase the redline. But I would need more specs on the cams if you wanted me to pipe max it.
Well I am not revving any higher because the bottom end is still stock. I don't think the rods will be very happy.

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Originally Posted by emilio700 View Post
The Maruha has optional venturi inserts 45, 50 and 55mm. The BP header ships with 50mm standard.
Do you think removing the venturi all together would be detrimental or should I consider going with the larger 55mm?
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Old 09-05-2014, 02:49 PM   #70
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I do not know yet. We are just beginning to experiment with venturis our selves.
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Old 09-14-2014, 04:37 AM   #71
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I do not know yet. We are just beginning to experiment with venturis our selves.
what is the goal of the venturi? shouldn't do much given results of this test. should it?
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Old 09-14-2014, 10:57 PM   #72
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The venturi is supposed to increase scavenging and reduce the losses of the flex pipe.
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Old 09-15-2014, 11:20 AM   #73
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The venturi is supposed to increase scavenging and reduce the losses of the flex pipe.
supposedly. but don't the results of this test say otherwise?
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Old 09-15-2014, 01:18 PM   #74
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supposedly. but don't the results of this test say otherwise?
Its really not an optimized piece. What they're trying to do isnt really possible with their execution of it.
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Old 09-15-2014, 02:12 PM   #75
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Quote:
Originally Posted by wmute View Post
what is the goal of the venturi? shouldn't do much given results of this test. should it?
That would be one (erroneous) conclusion. Two different header designs so not A/B test. The safe conclusion would be that RB's 4:1 config, pipe diameters and primary length are perhaps a better combo that the Maruha/Maxim/Fujitsubo et.al. All of the EP headers I've seen are 4:1.

Separately, we already know properly designed and implemented venturis have proven to work in other engines for decades. Good venturis are not cheap to make. My conclusion is that the RB might benefit by adding a venturi. So that's what we're trying next.
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Old 09-15-2014, 07:47 PM   #76
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^^^ If you guys can come up with a venturi system that adds a proven 5 whp and 5 ft-lbs of torque to the Racing Beat header that would be freaking awesome.
You all can then turn around and sell that RB header for $600 instead of $439. I would be willing to pay the extra $$$, go for it.
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Old 09-15-2014, 07:51 PM   #77
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I'm not sure what 949's plan is exactly for this setup. But my way of doing it would involve cutting the primaries off where they enter the stock collector then welding in a new collector with a proper merge and megaphone. Material alone would increase the cost of the header by about $350.
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Old 09-16-2014, 09:27 AM   #78
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Quote:
Originally Posted by emilio700 View Post
That would be one (erroneous) conclusion. Two different header designs so not A/B test. The safe conclusion would be that RB's 4:1 config, pipe diameters and primary length are perhaps a better combo that the Maruha/Maxim/Fujitsubo et.al. All of the EP headers I've seen are 4:1.

Separately, we already know properly designed and implemented venturis have proven to work in other engines for decades. Good venturis are not cheap to make. My conclusion is that the RB might benefit by adding a venturi. So that's what we're trying next.
point taken I thought that MW and Maruha were sufficiently similar. Even then, none of them is 4-1
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Old 09-25-2014, 06:25 AM   #79
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Speaking of ceramic coatings... where is everyone sending their headers to these days?
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Old 09-25-2014, 10:41 AM   #80
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