headder for b18c w/ 2.5" collector

[Cartoon]

i cant seem to find any with a 2.5" collector??? what kinda gains n where would i feel them with a 2.5" on a b18c.

thanks ppl

Oh also any one running a 2.5" with a mugen twin loop muffler? jst wondering how it works.

thanks again

[BiGANG]

a lot of headers have 2.5" collector that suit b18c. 98 JDM type R is one good example. DC sports is another.
They are everywhere matey. 2.5 exh mite be a but much on a standard car as it will kill the low-mid range a little bit but do a bit of work and the 2.5 would be a pretty good match up to the b18c engine, :)

[locote]

most jap bolt on exhaust for the typeR are only 60mm or 2.34"
i reacon 2.5 into a highflow cat and 2.25 mandrell would be a good size for any N/A 1.8lt vtec, nonvtec honda.
most ppl say go 3" for turbo but ive seen 2lt turbo cars make 300+hp with a 2.5"
i think 2.5 is to big for no turbo i got 1 in my and i think i could make more torque with a 2.25 mandrell

[ginganggooly]

i gained about 4kw from 4.5k rpm to cut out when i changed from a 2.25" cat back to a 2.5" cat back. so i'd say that a 2.5" is the right choice.
as for the header, i'm now running a jdm 4-1 which apparently has a 2.5" collector -although i'm yet to actually measure it. i'd be inclined to suggest an smsp header if you are willing to spend around 1400 or so.

[vinhy]

t1r (type one racing) has headers with 2.5" collector.

http://www.aj-racing.com/catalog/product.php?productid=1093&cat=0&page=6

[typsy]

I would recommend a good 4-2-1 header with 2.5" collector size. When I changed my header to a 4-1 design i felt a slight lost of power in the lower-mid range but a tiny gain at the top. When i changed to the Mugen 4-2-1 header the gains in the mid-range was very noticable.

[MRJDM]

If your after a great custom set made PM dyno dave he has some great header that are dyno proven
regards

[Cartoon]

thank heaps ppl, i must have been looking in the wrong spot or was jst way to tired lol.
typsy how good do u think the mugen headder is??? i was thinking about getting one but there dam expensive.

and i intend to do some internal work so from what i have read around the site 2.5 is prob what im after, its a hard decsion on selecting these things lol

any other tips???

thanks again

[nipnip]

im pretty sure my jdm 4-1 headers has a 2.5" ID collector, and the mugen should have it too

[faijai]

im pretty sure my jdm 4-1 headers has a 2.5" ID collector, and the mugen should have it too

yep the jdm itr headers have a 4-1 collector. u got these as well wilson?

[nipnip]

yep the jdm itr headers have a 4-1 collector. u got these as well wilson?

yep, had them for a while now, they're pretty loud for stocky headers, cars got a really high pitched f1 noise!

[e240]

yep, had them for a while now, they're pretty loud for stocky headers, cars got a really high pitched f1 noise!

When you guy's talk about JDM 4-1, did you all mean this?
http://cgi.ebay.com/ebaymotors/Integra-Type-R-JDM-4-1-Stainless-SUS-304-Header-B18C5_W0QQcmdZViewItemQQcategoryZ33631QQitemZ80154 89545QQrdZ1QQsspagenameZWDVW

If so, how has this performance been? Anyone have reviews or Dyno Tunes to backup any claim? I'm looking at this unit as opposed to somthing dreadfully expensive.

[quangsta]

http://www.ozhonda.com/forum/showthread.php?t=30517&highlight=headers+test

compares most of the big name headers along with the jdm...

[ginganggooly]

When you guy's talk about JDM 4-1, did you all mean this?
http://cgi.ebay.com/ebaymotors/Integra-Type-R-JDM-4-1-Stainless-SUS-304-Header-B18C5_W0QQcmdZViewItemQQcategoryZ33631QQitemZ80154 89545QQrdZ1QQsspagenameZWDVW

If so, how has this performance been? Anyone have reviews or Dyno Tunes to backup any claim? I'm looking at this unit as opposed to somthing dreadfully expensive.

I've got one bolted to a 2.5" system, i ended up with 110kw after tuning with everything else stock. I'd be inclined to suggest getting an expensive one.

i can't PM you or email you about those brakes you have for sale, reckon i could get you to shoot me an email? schlim@gmail.com

[nipnip]

When you guy's talk about JDM 4-1, did you all mean this?
http://cgi.ebay.com/ebaymotors/Integra-Type-R-JDM-4-1-Stainless-SUS-304-Header-B18C5_W0QQcmdZViewItemQQcategoryZ33631QQitemZ80154 89545QQrdZ1QQsspagenameZWDVW

If so, how has this performance been? Anyone have reviews or Dyno Tunes to backup any claim? I'm looking at this unit as opposed to somthing dreadfully expensive.

they're replica ones, the OEM one is not as blingy. alternatively, xforce make a cheap replica too, though one of the pipes is actually slightly longer

[e240]

they're replica ones, the OEM one is not as blingy. alternatively, xforce make a cheap replica too, though one of the pipes is actually slightly longer

So you're basically talking about Stock JDM ITR units, not the above.
Ok.

[e240]

i can't PM you or email you about those brakes you have for sale, reckon i could get you to shoot me an email? schlim@gmail.com

I thought I removed that signature. Sorry, but have decided to use the brakes for my own car instead.

[nipnip]

So you're basically talking about Stock JDM ITR units, not the above.
Ok.

the 4-1 headers on my car are oem jdm stockers

xforce make a replica, looks the same but chromed up, and the one on the ebay link looks very similar

[e240]

[QUOTE=ginganggooly]I've got one bolted to a 2.5" system, i ended up with 110kw after tuning with everything else stock. I'd be inclined to suggest getting an expensive one.[QUOTE]

Are you using a B16? or B18? If your engine made 110kw from just the system, isn't that already very good? especially when all else is stock.

Why would you then suggest the expensive one (i.e. Toda)

However, are you using the real deal JDM header or just a JDM replica?

[locote]

i found that the edelbrock/mugen replica one i got (4-2-1 single peice) worked very well through out my whole rev range.

[DynoDave]

[QUOTE=ginganggooly]I've got one bolted to a 2.5" system, i ended up with 110kw after tuning with everything else stock. I'd be inclined to suggest getting an expensive one.[QUOTE]

Are you using a B16? or B18? If your engine made 110kw from just the system, isn't that already very good? especially when all else is stock.

Why would you then suggest the expensive one (i.e. Toda)

However, are you using the real deal JDM header or just a JDM replica?
I will answer this for ginganggooly his car is a STD VTiR Integra with 225,000klms on the clock when we tuned to the 110kw nothing on the engine other than JDM ITR headers and a custom 2.5" exhaust where used.And as for suggesting Toda headers is the JDM ITR header is not the best out there and for all out power and the Toda will offer a gain in mid range power over the ITR header.So for the extra money would be a better unit and as for the Mugen header I have found on the dyno they lack mid range power but do make good top end,the best off the shelf B Series header I have ever used is the SMSP by a long way and was worth the $1600 that it cost.There will be a new thread started sortly with a custom made header vs the JDM ITR unit the custom headers where finished yesterday and just need to be fitted so stay tuned.
Regards Dyno Dave

[BiGANG]

what power did ginganggooly's teg make before the exh and extractors? Was the power gain substantial over the standard power or is the jdm header a waste of money? We accept that you get what you pay for and the standard jdm header is obviously cheaper than the smsp and toda items but some people dont have the money to spend on a top shelf sort of system.

[DynoDave]

what power did ginganggooly's teg make before the exh and extractors? Was the power gain substantial over the standard power or is the jdm header a waste of money? We accept that you get what you pay for and the standard jdm header is obviously cheaper than the smsp and toda items but some people dont have the money to spend on a top shelf sort of system.
You will have to get an answer from him on that as I only started working on the car with the ITR Headers and current 2.5" exhaust.The JDM ITR headers are a very good buy and offer a good bang for buck and I have fitted and used them to great success both on the road and racetrack.
Regards Dyno Dave

[nipnip]

110 kw is alot on the dyno for stock vtir, which dyno was this on? was it in shootout mode?

[ginganggooly]

My car made 91kw untuned, with the old header. i ended up with 110kw after header and tuning. 19kw is a bit too large of an increase for the tuning alone (it is a stock motor remember), so i guess the header does work.

i've actually just gone and bought a dynodave header, so i think i'll let my purchasing decision speak for itsself (yes, i think it's a very good buy) :D

[DynoDave]

110 kw is alot on the dyno for stock vtir, which dyno was this on? was it in shootout mode?
How do you figure that its alot of power for a STD VTiR Integra engine fitted with JDM headers + 2.5" exhaust and TUNED CORRECTLY with S200 Hondata.Forget racing dyno's this car ran 14.3@96mph that tells you its making good power for a STD engine.
Regards Dyno Dave

[Cartoon]

what else is done to the car?????
along with my exhaust system i want stage 1 cams a computer, mugen head gasket ect ect mostly bolt ons nothing exessive, i wanna push her into the 13 sec mark.

[ginganggooly]

i had the jdm header, custom livo cat back, diy icebox and a hondata...

[VTi-R Civic]

i gained about 4kw from 4.5k rpm to cut out when i changed from a 2.25" cat back to a 2.5" cat back. so i'd say that a 2.5" is the right choice.
as for the header, i'm now running a jdm 4-1 which apparently has a 2.5" collector -although i'm yet to actually measure it. i'd be inclined to suggest an smsp header if you are willing to spend around 1400 or so.

I have an new/unused JDM 4-1 header at home and have measured it (at the collector). The outer pipe diameter is 2.5", the inner diameter is closer to 2.25". (Which is why I haven't decided if I am fitting it to my car yet...).

I have pics I can upload at home if anyone wants. :)

[Limbo]

Making 14s is quite possible with NA with just bolt-ons but under 14s with a stock motor is almost impossible unless its had some decent work done to it.

[Cartoon]

Making 14s is quite possible with NA with just bolt-ons but under 14s with a stock motor is almost impossible unless its had some decent work done to it.

thats what makes it so much fun, trying to achive somthing different with less work than others :)

[DynoDave]

I have an new/unused JDM 4-1 header at home and have measured it (at the collector). The outer pipe diameter is 2.5", the inner diameter is closer to 2.25". (Which is why I haven't decided if I am fitting it to my car yet...).

I have pics I can upload at home if anyone wants. :)
All exhaust pipe measurements are OD not ID so do not quote the ID as the size.Most wall thickness is 16G or 1.6mm that is all for todays lesson.
Regards Dyno Dave

[VTi-R Civic]

All exhaust pipe measurements are OD not ID so do not quote the ID as the size.Most wall thickness is 16G or 1.6mm that is all for todays lesson.
Regards Dyno Dave

Well, I learned something new today... :thumbsup:

[Limbo]

thats what makes it so much fun, trying to achive somthing different with less work than others :)

Mate whichever company could do that with bolt-ons would make a truckload of $$$, also i believe most people have tried and it comes down to putting more work and $ in to make the car faster, otherwise we would all b having fast cars.

[ALLMTR996]

Mate whichever company could do that with bolt-ons would make a truckload of $$$, also i believe most people have tried and it comes down to putting more work and $ in to make the car faster, otherwise we would all b having fast cars.
If I was you I would not bet money on someone on these forums working very hard on running 13's with a STD engine.The car has run 14.3 so far and I know he has made more power since then and he is only using bolton parts and tuning so let the games begin.
ALLMTR996

[STOCK]

If I was you I would not bet money on someone on these forums working very hard on running 13's with a STD engine.The car has run 14.3 so far and I know he has made more power since then and he is only using bolton parts and tuning so let the games begin.
ALLMTR996

With a standard engine you mean untouched head/cams/block and pistons etc? I beleive 13s will not happen N/A with a STD engine in a integra vtir. Prove me wrong though :D

[ginganggooly]

With a standard engine you mean untouched head/cams/block and pistons etc? I beleive 13s will not happen N/A with a STD engine in a integra vtir. Prove me wrong though :D
all in good time

[DynoDave]

all in good time
Slim they have made me :mad: time for some more dyno time I think with another set of development headers.
Regards Dyno Dave