So many Comptech header clones... why don't they try this design?
01-27-2005, 06:33 PM
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According to jlucas (TL forum member) who also races the Team Honda Research '04 TL says prototype racing made them for the track car and they are currently installed.
01-27-2005, 06:39 PM
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too bad it's taken them years to get it done. 
01-27-2005, 06:40 PM
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Originally Posted by mattg
too bad it's taken them years to get it done.
Fair enough... i'm happy with my Comptech's as well, but always interested in what's new.
01-27-2005, 06:45 PM
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i agree about having new stuff... but they started talking about these when we were talking about the mystery mod. 
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01-27-2005, 07:22 PM
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comptech is teh OG
01-27-2005, 08:22 PM
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Originally Posted by mattg
i agree about having new stuff... but they started talking about these when we were talking about the mystery mod.
The good ole mystery mod.
I woulda loved to see that in production.
01-27-2005, 10:13 PM
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Mystery Mod = MM1 = RES
Basically an enlarged chamber on the upper intake manifold to enhance the resonance efffect when the IMRC opens the bypass actuator valve.
Only problem is, it was produced a few times, then the fabricator disappeared from the forums w/o leaving the plans for the modification available to anyone. Scalbert attempted to design a similar system but it provided no gains.
Basically an enlarged chamber on the upper intake manifold to enhance the resonance efffect when the IMRC opens the bypass actuator valve.
Only problem is, it was produced a few times, then the fabricator disappeared from the forums w/o leaving the plans for the modification available to anyone. Scalbert attempted to design a similar system but it provided no gains.
01-28-2005, 03:30 AM
#15
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A number of possiblities to consider...
Originally Posted by mrsteve
Equal length =
1. Cost.
a. IMO, Comptech has already amortized the design, development, tooling, production/fabrication costs, and they can use one basic jig to produce headers that fit a number of J32 engines in a number of Honda/Acura platforms. (I’m not saying that the equal-length design couldn’t accomplish this, only that Comptech has already got something that gives good gains and seems to have few problems.)
b. Clearly more material and a tighter fit with the equal-length headers could lead to higher production cost if every thing else is kept “level.”
2. Trade-offs...
I don't know that there is a rule cut in stone, but in general, equal length is preferred for racing and will produce more top end power relative to “most” unequal designs. (Pulse tuning is not without its tradeoffs.)
I had both 4-2-1 and 4-1 headers on my 4 banger, and the 4-2-1 lost a few HP at 8K RPM, but had more torque around 3-4K. The sound was, IMO, nicer with the equal-length headers and sounded like an Offy at 8K RPM.
3. Intangibles/2nd order issues.
It might be possible to delay the "light off" of the catalytic converter with one design vs. the other. This could be mitigated by adding a thermal wrap or coating.
Resonances -- it is possible to have "unusual" resonance nodes that will excite objects near/around the headers depending on their design.
01-28-2005, 05:39 AM
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Originally Posted by mrsteve
Mystery Mod = MM1 = RES
Basically an enlarged chamber on the upper intake manifold to enhance the resonance efffect when the IMRC opens the bypass actuator valve.
Only problem is, it was produced a few times, then the fabricator disappeared from the forums w/o leaving the plans for the modification available to anyone. Scalbert attempted to design a similar system but it provided no gains.
Basically an enlarged chamber on the upper intake manifold to enhance the resonance efffect when the IMRC opens the bypass actuator valve.
Only problem is, it was produced a few times, then the fabricator disappeared from the forums w/o leaving the plans for the modification available to anyone. Scalbert attempted to design a similar system but it provided no gains.
http://www.geocities.com/gamesmgr/chod/acura/#Mods14
01-28-2005, 05:49 AM
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Originally Posted by EricL
I don't know that there is a rule cut in stone, but in general, equal length is preferred for racing and will produce more top end power relative to “most” unequal designs. (Pulse tuning is not without its tradeoffs.)
There's alot of welds on the equal length headers, they'd probably crack given the track record of headers out there
01-28-2005, 07:10 AM
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EricL is absolutely right... cost.
Just looking at those bends in the tubing I think it would be very expensive to manufacture and sell. If people balk at a set of CTs for $1100, what price do you think these would sell for (assuming they're decent quality) and how many do you think would sell especially if it only amounts to minimal gains over a set of CT style headers?
It's a business and if they don't think they'll rocoup their money and make a profit, they won't make it into production.
Just looking at those bends in the tubing I think it would be very expensive to manufacture and sell. If people balk at a set of CTs for $1100, what price do you think these would sell for (assuming they're decent quality) and how many do you think would sell especially if it only amounts to minimal gains over a set of CT style headers?
It's a business and if they don't think they'll rocoup their money and make a profit, they won't make it into production.
01-29-2005, 06:37 AM
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Originally Posted by Zapata
love the blast after 5k but more mid-range punch would be great!
Those headers would most likely reduce the midrange and ad HP at the top. For racing you want the max high rpm HP you can get. Generally a header that brings the pipes together closer to the head will have more torque. One with individual pipes on each cylinder for a longer distance will produce more HP.
01-29-2005, 10:42 AM
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Originally Posted by ChadT
Those headers would most likely reduce the midrange and ad HP at the top. For racing you want the max high rpm HP you can get. Generally a header that brings the pipes together closer to the head will have more torque. One with individual pipes on each cylinder for a longer distance will produce more HP.
Not so, AV6 dyno:
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