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11-18-2008, 01:55 AM | #1 |
Drives: 2008 Yaris hatch Join Date: Oct 2008
Location: Las vegas, NV
Posts: 183
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Long Tube Header Dyno results & Photo
Here is the graph of the dyno testing on the long tube header. The three runs represent the stock exhaust system, removal of the stock exhaust (running open exhuast manifold) and then the long-tube header and 2.5-inch exhaust section. We ran a 2.25 section with no change in power. System will be mild steel, header will require custom mid pipe wich will be made to go with header and pricing for both will be near $550 (waiting for official production quotes). If we get 10 people wanting this (gains are impressive), I will make a production run. The system will need a secondary oxygen simualtor (ask cali) to eliminate CEL but it causes no problems with power or driveability. Also check out posts on NST dyno results and new NA power record.
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11-18-2008, 02:00 AM | #2 |
SIPNDEW
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man i would hop on it but im going to be out of money after your manifold. :(
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11-18-2008, 02:00 AM | #3 |
Drives: 08 toyota yaris LB Join Date: Oct 2008
Location: las vegas/ henderson
Posts: 182
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OMG im goin crazehhhhhh. so many new stuff so little time. since im in vegas can i see your work please?
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11-18-2008, 02:14 AM | #4 |
Drives: 2008 Yaris hatch Join Date: Oct 2008
Location: Las vegas, NV
Posts: 183
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I tried to upload photo of long-tube header but I think it was too large-I e-mailed to fellow enthusiasts and hopefully he will post it here tomorrow.
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11-18-2008, 11:50 AM | #5 |
rice rocket
Drives: 05 Echo Join Date: Feb 2007
Location: Toronto
Posts: 163
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i guess he posted it in the other thread but not this one
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11-18-2008, 12:00 PM | #6 |
I know it's early, but could you find out what this thing will cost done in 304 SS?
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11-18-2008, 12:17 PM | #7 |
Who said Yaris was slow?
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11-18-2008, 12:27 PM | #8 |
Who said Yaris was slow?
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Hey Richard,
Would you care to educate us a little bit on the theory behind this long tube header design. You have explained a lot about the theories involved in the Intake manifold tuning and such... We all know the main idea of an aftermarket header is to improve the flow of the exhaust gases into the exhaust pipe. People often debate also between the pro's and con's of 4-1 vs 4-2-1 designs. So what is behind this long tube design of yours? |
11-18-2008, 12:39 PM | #9 | |
Drives: 2008 Yaris hatch Join Date: Oct 2008
Location: Las vegas, NV
Posts: 183
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Headers operate on the same principle as intake manifolds. The primary length is tuned to optimize scavenging (using a negative pressure wave reflected back to the open exhaust valve) that helps draw more intake charge into the combustion chamber. The header does not simply allow the exhaust to flow better than the stock ex manifold (this is the case with a larger diamter, shorty style header), but the gains are miniaml compared to teh long tube since the stock header is not terrbibly restrictive to flow. Gains from changes soley in exhaust flow are minimal as indicated by the gains offered by dropping the whole exhaust system (cats and mid pipe-middle line in graph). The real gains come from the scavenging effect produced by the combination of design characteristics of the header. We tried a number of different primary lengths and diamters as well as several collector designs to fine tune the gains. 4:1 and Tri-Y headers can be tuned to produce the same power curves-one is not inherantly better than another at different engine speeds, though each design can offer somehting not available by combinations of the other (usually minor gains in power at distinct engine speeds-but this will be dependant on the engine combination-primarily cam timing, displacement and intake design). The right design for any single combination takes a lot of work. BTW-we tesed the header designs with both the stock and new intake.
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11-18-2008, 12:59 PM | #10 |
Who said Yaris was slow?
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Thanks
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11-18-2008, 02:43 PM | #11 |
more of my money coming your way. i want this.
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11-18-2008, 03:19 PM | #12 |
Super Moderator
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I'm interested, although it's not immediately clear to me whether this header is a 4-1 or a 4-2-1 (or even if it really matters now). If someone would enlighten me I would certainly appreciate it.
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11-18-2008, 03:21 PM | #13 |
4-1.
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11-18-2008, 04:02 PM | #14 | |
rice rocket
Drives: 05 Echo Join Date: Feb 2007
Location: Toronto
Posts: 163
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Quote:
A 4-2-1 involves having a pair of ports merge, and then those merged pipes come together to the one pipe. sorry i dont remember the correct terms at the moment, but hopefully you get the right idea. so i guess it needs a complete custom exhaust route if we want to keep a cat and other stuff to pass emissions?
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11-18-2008, 04:09 PM | #15 | |
Drives: 2008 Yaris hatch Join Date: Oct 2008
Location: Las vegas, NV
Posts: 183
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The header isa 4:1 design. Since we remove the cats for header installation, the only way to install cats would be to reposition them downstream in the exhaust. The header will require and come with a dedicated mid pipe to connect header to axle back.
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11-18-2008, 04:12 PM | #16 |
Drives: . Join Date: Apr 2007
Location: .
Posts: 1,828
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HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?HOW MUCH?
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11-18-2008, 04:14 PM | #17 | |
Who said Yaris was slow?
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Quote:
In order to take your car to inspection you will probably have to keep your OE manifold and mid pipe with the OE cats and modify it to add a flange in a way that you can remove the long tube header and mid pipe and install the OE back for inspection purposes. |
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11-18-2008, 04:15 PM | #18 | |
rice rocket
Drives: 05 Echo Join Date: Feb 2007
Location: Toronto
Posts: 163
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Quote:
sounds like a pain to take on/off when i visit the track then :P
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