Aftermarket Exhausts?

[WhiteGDB]

Originally Posted by toxicdrift

is there any jap manufacturer thats making a made in japan exhaust then?

There will be plenty. I'm gonna see what Fujitsubo comes out with.

Edit: Looks like they already made one. Nice little video there as well.

http://www.fujitsubo.co.jp/prods/det...04741/00001474

[Gardus@Supersprint]

Mmm I think Amuse?

Usually Japanese and American manifacturer (Agency Power, Magnaflow, Invidia, HKS and lots of smaller ones) make the design and testing (if they do any testing) in the home country and then outsource the production to company like Liang Fei or SSI, which are based in Taiwan and have facilities in China.

The quality of the steel is not know, we've seen components from many of these brands with magnetic caracteristics. Also they look very good from new but then...
These are front decat pipes with 2000 miles (yes, two thousand) on an M3 E92. I won't say the company but it's one of the above.



In the second pictures you clearly see the fade from the nice polished tig welded look from new to the badly rusted look after small use.
Just look on google images for "company name" rusted and you'll see.

[Dimman]

Originally Posted by Gardus

Mmm I think Amuse?

Usually Japanese and American manifacturer (Agency Power, Magnaflow, Invidia, HKS and lots of smaller ones) make the design and testing (if they do any testing) in the home country and then outsource the production to company like Liang Fei or SSI, which are based in Taiwan and have facilities in China.

The quality of the steel is not know, we've seen components from many of these brands with magnetic caracteristics. Also they look very good from new but then...
These are front decat pipes with 2000 miles (yes, two thousand) on an M3 E92. I won't say the company but it's one of the above.



In the second pictures you clearly see the fade from the nice polished tig welded look from new to the badly rusted look after small use.
Just look on google images for "company name" rusted and you'll see.

I would bet money that the top is an Agency Power exhaust. To even give them credit for designing their own systems is way too much. They probably just hit up Alibaba and order what's cheapest, same as any garbage ebay company. They had an advertising issue caught by some people on NASIOC a while ago, claiming to use 321 stainless on some WRX headers. Apparently there is ONE company that regularly makes real ($$$) 321 Subaru headers and they offered to pay for shipping and lab-test for free any '321' Agency Power headers that members bought. Right after that, description was changed. Go figure...

There is a second issue that I don't think you see, Gardus. On the second pic it may have to do with the Chinese 'polishing' by flash chrome plating rather than the metal being super-terrible. I have some VQ35 headers at home that I will take pics of or make a video of to explain a bit better. Has to do with non-magnetic tubes, but magnetic flanges, as well as fast, inconsistent and cold wire-feed welds that are gone over again with a TIG torch to clean them up. (Pictures will explain better...)

All that being said, I'm not a fan of what looks like robotic flux-core or MIG welds on some of the Supersprint pieces (tube to muffler or cat joints). I would expect their quality to be good, but for the money, I would like the appearance to match...

[Gardus@Supersprint]

We use MIG welding on some components, especialli the pipe/muffler connection, as it's more durable, but if you use a reinforcing bracket it's not a big deal.
On high-end products we use only TIG welding on everything, I want to do this on the 86 exhaust system, but I'm worried that it'll be too expensive.
Labor is not cheap in Italy!

[Gardus@Supersprint]

Originally Posted by gtauto

Some more really cool products from the weekends HKS Premium day at Fuji Speedway. Was lucky enough to attend for the 3rd year running.

I think is good to post it here. HJS headers...
Interesting...why two different designs if you're going to couple the same cylinders? maybe it's hard to tell from the pictures but they are two different diameters? The one on the bottom seems slighly bigger.

I'd guess you'd need a manifold for NA cars and a different one for FI cars.

I'd go for a bigger stepped 4-into-1 manifold for track car, both NA and FI, to maximise the top end power above 4000 rpm.

They don't seem to be much different from the stock manifold, exept for the absence of the 1st cat.

What's written in the sign?

[Dimman]

Merge angle of the primaries is terrible...

[Gardus@Supersprint]

Originally Posted by Dimman

Merge angle of the primaries is terrible...

Agreed, but it has less effect that you may think.

[Dimman]

Originally Posted by Gardus

Agreed, but it has less effect that you may think.

My understanding is that acoustics/pulses don't care about angle, but it will still cause flow turbulence and hinder inertia-based (rather than acoustic) scavenging.

Every bit of gain we can get is going to count. Something like under 30 degrees included angle would be much better (and make my welder hate me, heh...).

[Dimman]

Video I did showing and trying to explain some poor qualiy VQ35 headers.



[ame="www.youtube.com/watch?v=iu0D9Y32SSY&feature=youtube_gdata_player"]YouTube - Broadcast Yourself.[/ame]

[Gardus@Supersprint]

It says it's private.
Anyway yes, tight corner in the headers can create a "back flow" and some backpressure on the exhaust port, so it's better to avoid them, but the lenght of the pipes is more important, as the pressure waves have more effect and car really affect the exit of the gas from the chambers.

[Dimman]

Originally Posted by Gardus

It says it's private.
Anyway yes, tight corner in the headers can create a "back flow" and some backpressure on the exhaust port, so it's better to avoid them, but the lenght of the pipes is more important, as the pressure waves have more effect and car really affect the exit of the gas from the chambers.

Crap. I'll go fix that.

Edit: fixed

[Mr.Jay]

Dim, that rant was very educational.

Thanks for the post

[Dimman]

Originally Posted by Mr.Jay

Dim, that rant was very educational.

Thanks for the post

It's a bit incomplete as I didn't talk about if the were clean and oil-free (just from your hands) before they got hot as that can discolour good stainless too.

[Gardus@Supersprint]

Thanks Dimman. I'd really like to see your comment of our headers.
In the past we did have some chrome plated headers for some tuner as they requested that finish, but I agree that it's good to be able to see the quality of the welds.
For a few recent components we did some "electro-polishing" before welding. No chrome but a nice polished look but you can still see the quality of the TIG welds:

http://www.supersprint.com/en/prod-p...093E280BA.aspx


I'd like to have that quality for the 86 system, at least for the headers.