j's racing header

[tinkerbell]

looks like a 4-1 JDM ITR copy

in what possible way?

it is a 4-2-1 design?!??!!

[ryuhou]

the bc header from justin
do u guys no if its the new design
where u can keep aircon and PS
or the old one
sori im n00b i cant tell

[kavehman]

all of that design allows you to keep A/C and PS.

Not sure but keep in mind if you have an ITR you may have to modify the tranny brace to make it fit.

[ryuhou]

tranny brace?
yonas said id need to replace the flywheel cover with a b16 one

[kavehman]

I am under the impression that the tranny brace needs to be swapped with a regular B series one.

May want to double check and get back to us.






Normal B series versus Type R brace.

[ryuhou]

yep its both flywheel cover and brace

[szymonsta]

can't believe someone said they'd never heard of j's racing exh.mani, as j's racing is one of the MAJOR honda tuners in japan.
when i was looking into exh.mani upgrades for my dc2r i did a fair bit of research into differet options..
* find out the deatails of the exhaust including pipe diameter, runner design and length, weight, etc. then also look at weld and finish quality.
*jdm 4-1 is a good upgrade for the audm dc2r, the aussie cast design looks pretty ugly and tight, finish on the inside is not as nice. the jdm ones are still mild steel but at least a nicer design and finish. they are 4-1 which promotes top-end power a little and according to other people's dyno's using these givers a reasonable power gain and good bang-for buck as theyre cheaper than most brand-name ones.
*i found many aftermarket japanese b-series headers use 40mm or 42mm primary dia., which i think is a little too small. from memory, only mugen, maximworks, toda and jun headers use 45mm primaries.
*the maximworks headers i got in the end use 45 -> 50.8 -> 60.5 which is slightly larger dia. than many of the other aftermarket brands eg fujitsubo, hks, apexi, j'sracing etc
*in terms of finish quality, i'm a bit of a jap-o-phile so i go for japanese brand-name stuff. i beleive (but not 100% sure) that j's racing and buddy club now manufacture their headers overseas, not sure if korea or china or what but im pretty sure no longer in japan. this is one way they can be price-competitive. the toda headers have a 'race-inspired-look' fake spring joint between the secandary and tertiary pipes which is a bit naff for such an apparently design-focused company. but this is another design point to look for - whether the headers are 2-piece or 1-piece, obviously a 1-piece has the advantage of no joint-bolts and extra gaskets which may impair efficiency..
*some designs eg. the discontinued Phase headers incorporate a flexi-joint which ive been told does not do much for performance, but means the engine vibrations are not transferred thru the entire exhuast as much..
*in terms of the design of the primaries, as tinks said it appears some brands have a sharp almost 90deg turn very soon after exiting the engine block which appears to be not the most ideal design from a gas-flow point of view (though i am no expert on gas flow properties, i am basing my educated guess on basic physics). in this sense the toda design appears quite good, for example.
*the lenght of the primary, secondary and tertiary pipes has an effect on performance. the general rule is longer primaries and secondaries or 4-1 designs promote top-end, shorter primaries and secondaries promote low-mid range. eg. if you look at mugen's design, they offer the mugen 4-1 for more top-end power, and a 4-2-1 with shorter primaries and secondaries which is a gymkhana-spec, for improved low-mid torque as needed in gymkhana type use..
*the j's racing 4-2-1's were quite cheap and i was very interested in them, but in the end i decided to go for the m-bit's as they had a more mid-top-end focused design and slightly larger dia.pipework.

i would be very interested to see how the j'sracing stuff performs so if u end up getting these please keep us informed on how it goes.
hope this long post is of some use

ps i fitted my headers without changing and transmission mounts or clutch stuff or whatever u guys r talking about.

[JDM Concept]

also just to add on.

i asked murakami-san, the president of J's racing when i was there. about where j's racing product is manufactured.

They say it is manufactured in japan. it is true they said that some parts (small amount of resources) were sourced from overseas but the item was never made overseas and imported to japan.

in japan, especially the japanese customers are very fussy people. in terms of using performance product, they are very particular about quality wise. and it is not cheap to be manufactured overseas as well to have certain standard that they want.

in terms of product distribution, 50% go to domestic market and 50% to overseas market. (mainly to america as their biggest market, i guess for any other brand that america will the biggest)

and from the 50% of these market almost all of them are smaller tuning shop. there are very few resellers in japan like autoback etc etc.

hope this bit of information is helpful.

price wise it is affordable because js tried to make it affordable for overseas market.

it got nothings to do with poor quality workmanship that is associated with lower pricing.

in fact they are going to visit australia (the president that is) but im not sure when yet.

he will inform me further about it.

[ryuhou]

ye i dont doubt the quality of j's products
its just that i notice they focus on the s2000 honda fitt and more recently the fd2r
as opposed to the older b series engine
i might be wrong but it just doesnt seem speicalised

if i had an s2000 id get a j's header

[JDM Concept]

ye i dont doubt the quality of j's products
its just that i notice they focus on the s2000 honda fitt and more recently the fd2r
as opposed to the older b series engine
i might be wrong but it just doesnt seem speicalised

if i had an s2000 id get a j's header

the trend in japan dictate what it is.

in japan, i hardly see any dc2 anymore.

mostly is the newer jap car. dc2 was once popular but most people in japan has moved on. most has family and they modify SUV or van, passenger carrier instead. they can only has 1 car so the sports car has to go.

i would say js racing actually make quite a bit of b-series parts than most of other japanese brand.

i think they specialised one car at one particular time. dc2 was a long time ago.

this is what they focus in order of specialisation.

fd2, dc5, s2k/jazz, dc2/ek

so you can see how far behind we are actually from them. hence there wasnt any publicity at all for dc2 cars.

if u look at really old issues of hyper rev magazine. you can see plenty js racing dc2.

[tinkerbell]

can't believe someone said they'd never heard of j's racing exh.mani,

sometimes certain people feign ignorance to illicit certain responses, particulary if question askers appear to have very little information themselves...

thanks for the respone Szymonsta - excellent info!

[m0nty]

*in terms of finish quality, i'm a bit of a jap-o-phile so i go for japanese brand-name stuff. i beleive (but not 100% sure) that j's racing and buddy club now manufacture their headers overseas, not sure if korea or china or what but im pretty sure no longer in japan.

I know BC headers are made in Taiwan. A very small percentage of their products are still made in Japan from memory. I don't think BC is actually still a Japanese owned firm.

[Zilli]

in what possible way?

it is a 4-2-1 design?!??!!

the J's racing one Dave...

[tinkerbell]

do you mean the J's racing 4-2-1 is like a JDM 4-1 copy?

[Zilli]

:-) obviously not, i was under the impression the J's racing one was a 4-1... remember seeing it on the JDM Concept site... i could be wrong...

and looking again, yes i was wrong... my bad