Andy allways interested in something i've never seen before, lets see it i say.

james

James,

Thanks for the reply..

I see from the pic that it is open neck.. just a quite short open bit, etc..

Interested to see how you get on.

JGM :)

Hey James,

Whats the story, big improvement, any improvement at all ?

Cheers,
Ray :D

Not fitted yet, just bought a new grinding tool so I can smooth the lip off and the welds down before fitting.

Got a plug for the o2 sensor hole yesterday, still couldn't find a plug as a direct fit, ended up getting a part for downsizing threads, cut the smaller thread end off and brased the hole up, done the trick.

Saturday will be the day it goes on...unless i'm feeling frisky tommorrow:D

James

LOL...fair enough....cheers matey :D

Ray

Shes going on tommorrow! Got a tailpipe bung ready for the early week day mornings, what a considerate neighbour I am.

Decided to convert my HKS downpipe into a large open neck with the splitter mod soon, not much chance of selling it as is lol.

Smoothed the welds and the pipe lip where it joins the open neck.

Before, lip of pipe can be seen.

http://upload.turbosport.co.uk/getpi...8432442806.JPG

After

http://upload.turbosport.co.uk/getpi...4411595638.JPG


[tight arse mode] One of my brased fitting for the bung[/tight arse mose]

http://upload.turbosport.co.uk/getpi...4626216930.JPG

James

Fitted it earlier, took a lot of extra shaping to get it to fit right so be warned if your going to try.

Just got back from a test run :eek it feels 100 times better than the HKS d/p, I can't believe it really, spools up blumin quick and hits hard with the power and keeps it up to the redline.
The HKS feels wooly in comparrison the difference is amazing.

I know I should have done a comparrison with the standard open neck d/p but I was going to be happy if it was better than what I had and it is a lot better.

Deffinately worth the effort, I don't know how much better the normal open neck d/p is compared to the HKS but I'd be suprised if it was this much better.

Thanks Michael!

James(well chuffed):D

Hi James,glad you're happy after all that hard work.Its bloody inconsiderate of you not to have compared it to an open neck pipe so I'd know whether it was worth doing !(LOL)
I'm having it done on Tuesday so we'll find out.You mention having some difficulty with the fitting,what was that?

I presume he means the splitter needed shaping and finishing to go nicely into the turbo etc..

Well done!

JGM :)

If Andy.F is still watching this thread, can you post your pics for us please (or mail them to me and I'll post them for you).

Cheers,
Andrew...

Andy.F leaps into action :D (just a bit late:rolleyes:)

http://upload.turbosport.co.uk/getpi...1756102092.jpg

The main turbine discharge area is ported to remove steps and allow gradual expansion of the exhaust gasses directly into the main 3" downpipe.
This set up is to mate to a twin dump downpipe where the wastegate gasses go down a separate pipe which rejoins the main pipe at a shallow angle near the bottom of the downpipe.

Does it work ? Oh Yes :)

Andy

Andy,whats that contraption to the right of the turbine exit orifice.Also when you say yes it works do you mean the splitter or the twin dump or both?
Cheers,Deep.

Deep, like jgm said it needed a bit more shaping to fit, just used a little grinder attacthed to my drill and kept shaping it down til it fitted. Wonder if you'll see any improvement, let me know. Just been out for another drive, it's so much better but it's prob mostly down to the bad design of the hks d/p I had before.

Andy, that looks ideal mate, I'm going to set to work on my HKS d/p soon with a bigger open neck (purely coz i can't sell it) quite like the idea of putting a splitter in the shape of yours.

Anyone have any thoughts on what I could try on another downpipe?, I'm willing to try anything on this one. Whats gonna be ideal?, then I might be able to sell it!

James

Deep, the 'contraption' to the right is the wastegate, the arm on the top you can see is where the wastegate actuator arm fits onto.

Thanks James for the good information :)

Hayward and Scott have my downpipe at the moment,for modifying it to 3 inch.
I've sent them an e-mail tonight asking if they will also add the splitter to it.

Thanks for the e-mail response Andy.

Scoty

james, what about making a 100% seal between the turbine out put and a closed DP, then opening up the wastgate to vent to the atmosphere, if you get what i mean...

this would leave a completly uninterupted turbo flow and would be ideal. it would be possible with the use of a custom gasket and some clever welding.

also, imagine the sound it would make... might need a small silencer tho, bolted to the side of the DP.

Thanks guys.Scoty,do you mean H&S are converting your 2.5 to 3".How can this be done.I'm there on Tuesday and would be keen to have this done aswell if its possible.Deep.

Deep,

The H&S downpipe comes in 3 inch in standard form with a reducer to take it down to 2.5 where it joins on to the centre section.
H&S have said for £30 they can modify my 2.5 inch ;) downpipe to 3 inch all the way through.
I'm assuming they will just cut off the 2.5 inch reducer and fit a 3 inch sleeve.

Does that make sense?

It also means you need a 3 inch centre and back box.

jon, I like the sound of that.

Anyone have thoughts about this?, where were you thinking about the wategate venting, halfway down the d/p?.

Anyone got the wastegate housing they wanna sell me?, as in Andy's picture above.

James

I had considered leaving the small pipe on the twin dump open instead of it coming back in half way down the main pipe. Most of the remote wastegate set ups just exhaust direct un-silenced :D :D Waaaaaaaaaaa

Hi Scoty.I'll have some of that! Did'nt realise that could be done.I'm going to change to 3" back etc soon anyway.

Just thought you guys might like an easier option..........

http://www.airpowersystems.com.au/wrx/housing.htm

This has been available for a few years - for all the reasons mentioned in this thread. £99.00 inc. VAT

The APS does look a nice bit of kit but I think James has a TD05 turbo so would need adaption.. and this has cost him next to nothing so a nice cheap mod..


Deep Sigh might have been interested though?

JGM :)

The APS housing has only recently had the splitter part added, only in the last few months.Prior to this they actually believed there was no real benefit to be had. seems times have changed
Mark

(with MS's modded dump and smiling :)

i fitted myshelf the aps hfto with the spliter a week ago on my fully decated 3in "trust power evoII" exhaust.(my00)
the trust downpipe is exactly the same as the hks one.
well there is a difference but not as much as some people in this forum have led me to believe...
the std td04 spools up a bit quicker,but i still get 1.1kg/m2 at 2500-2600rpm with or without the spliter.
the engine thought is a LOT more smoother now specially in part throtle.
overall the car feels faster especially higher up in the rev region,but i have not dynoed it or anything to be 100% sure.
it is worth the 99p but its not worth the 12hours of work it took me to put it in place...very very very hard work.

Just read through the topic and had a thought.

I'm well outa my depth on this but I've noticed recently on an evo 4 (sorry) and an RS200 road car that they both had seperate waist gate exhaust pipes leading from the turbo all the way to the back of the car.

On the rs200 it almost looked like a mini pea shooter sized bore next to a 3.5 - 4" big bore exhaust.

(looked better than the description.)

You could always route it back in further down the system before the tail pipe etc etc.

Could you guys not incorporate this design to the open neck / twin dump down pipes?

Just an idea but you've prbly looked into this design already.

STE.W.

as JGM rightly said the mod cost me nothing actually.

blachie, the reason it made a difference on mine was because i went from a crappy hks closed neck, and as the d/p was there i thought i'd put the splitter in before i fitted it. my td05 spools up very quick now.

STE.W, if you see a previous post this is pretty much what andy f was talking about, i'm going to try and get my hands on a td05 wastegate housing and re-work my HKS d/p to split with the seperate wastegate dump pipe (just for a laugh!)

James,

You have too much time on your hand mate!

:)

But looking forward to the HKS/Open neck/wastegate pipe thread :)

JGM :)

This is the way I have done my splitter

http://www.tygsa.com.pe/images/exh1.JPG
http://www.tygsa.com.pe/images/exh2.JPG
http://www.tygsa.com.pe/images/exh3.JPG



[Edited by tato_dc - 2/18/2003 9:44:01 PM]

[Edited by tato_dc - 2/18/2003 11:27:11 PM]

[Edited by tato_dc - 2/18/2003 11:28:28 PM]

tato_dc
the problem you have there is the WG flow is going to suffer, your design is much like the MRT one and that is not so good, I have tested long splitters inside and they rob top end power.

There is a 02 STI over here that has an exhaust i did and made 20 kw as a bolt on, then they have ECUTEK mapping done with 18 psi , it then make 40 kw more, total gain was 60kw(190kw), also cold air duct.

Then come along a another guy that got 30 kw from bolting on a CES/BPM system on another 02 sti, what the twin dump pipes do is force gas pressure through the turbine and this is why he got "bolt" on power as it forces up boost pressure to, it makes it all look good and this can be very misleading, he has now had ECUTEK and same cold air duct fitted and run 18 psi too, yet now the power gains are only 15kw( 180kw), some 10 kw less overall than the open mouth car, yet the twin pipe car also made 8 kw more in std form and started better off.

The tuner that used the ECUTEK informs me that the twin pipe car is not only top end that misses out either, the twin pipe car has nothing on the open mouth one low to mid.

The open moth car uses a short collector too, 6-8" long due to the steering collum.

Soon as the second graphs are posted i will post the link.

Michael