So I just picked up a s5 turbo for my blow through project. I was wondering what down pipes people are using, and the s5 needs water and oil feed. I know what to do about oil feed and drain, but what about water? Is it necessary that they be used? I was thinking about picking up the RB downpipe and just doing a custom exhaust after that. Who is running blow through and what's do you feel might be applicable advise for me. I've got everything else figured out. Just hoping someone might cue up something I left out.

(click on the thumbnail to see the image, edited because the image is FORKIN' huge.... but worth seeing if you're on broadband)

 

if you want specifics I'll be running a 13b 4 port frankenstien. It'll be a gslse with 12a end plates making it a 4 port 13b. I'm going to either to a big street port or a small half bridge. I'm not sure if the turbo will be able to handle a half bridge though. I know guys are running t04b half bridges successfully, but dunno about a stock s5 turbo. It'll be blowing through my 45dcoe with 40mm chokes.

 

Water cooling isn't necessary, but wouldnt hurt. Im not sure where to plumb it in if you want to incorporate it. (S4 turbos are water and oil as well.) Id go with a custom 3" DP if you can find a shop to mandrel bend you one. Id also look into a custom exhaust manifold as well. Im sure FB II and others can answer your questions more effectively...

 

do you know of any shop that sells a 3"dp. Custome mandrel bending a friggin expensive ou here...

 

yea, i do not use the water cooling. just oil feed/return. i make sure to cruise slowly for a bout a mile or so before i get to my destination and then let it idle for a minute to make sure the oil has cooled off a good bit before shutting it off.

as for a downpipe, i made my own 3" mandrel bent exhaust. the downpipeis actually welded to the piece of the turbo that covers the wastegate area. this way i didnt have to worry about denting anything in for the studs and nuts to fit works out beautifully. comes off just as easy and seals up fine.

depending on where the turbo will actually sit will be the deciding factor on whether an rb downpipe will work or not.

 

The RB 3" stainless downpipe is super light,mandrel bent and so cheap its crazy to not use it if your running a stock turbo.....

$125.00 from Mazdatrix....

 

3" dp is made by corksport, and that's the one I'm buying.

 

[QUOTE=steve84GS TII]The RB 3" stainless downpipe is super light,mandrel bent and so cheap its crazy to not use it if your running a stock turbo.....

$125.00 from Mazdatrix....


I don't see a 3" DP on mazdatrix's website, and the only DP I see from RB is 2.5"

 

the rb 3" is part of the "hi performance" exhaust setup.

 

Its sold seperately or with the kit,same as the presilencer,which I also have.I keep it as a "race" muffler to replace my PowerPulse should I want to go loud.
The Mazdatrix page is old and still lists it as mild steel too.The newer stainless version I have is very nice.Its almost unreal how light it is....

 

I'm going to use a seperate 3" dump off the turbine and 2.25" dump off the wastegate.

You can tap the water pump housing for the water feed and weld a fitting into the heater return hardline for the return.

 

How are you going to do this? just put in a devider and then weld a dump tube on kinda like this?

 

actually yes. only, if you use a 3" dp there isn't too much room. i'm just going to seal it off all together and run an external wg

 

I used a RB 3in downpipe. It fit pretty good but I had the exhaust shop just bend it 1/2in or so to get more ground clearance. With my RB springs every little bit helps with speed bumps. It is the flange that hangs the lowest on mine.

 

That's tight I was looking at the turbo thinking about this, but I didn't say anything cause I figured some one was going to talk ish aboot the idea. I gues that'll work then. LOL.

 

FB II have you seen any of the RB DP on a stock turbo with renes header? so you think that would work? i dont see why it wouildnt. i think it would actually make it better.

 

no, it will not work because it dumps almost straight down. first off it would hit the frame, then after that it would be in the firewall. my downpipe alone is maaasssive. the rb one doesn't have the proper angle or length.

 

cool, i guess i get to use my new welder....

 

What is a "renes header" I searched to no avil.

 

Maybe RX3mist? I heard a couple of refferences to him in other posts, and I think his name is Rene could be wrong thow. I just bought a header that he made for another forum member who jsut happened to have a RHD model 7 there in the states, so it will work for my car (Yeah baby)

kenn

 

Is this the dp you guys you were talking about?

86-91 Turbo Downpipe - fits to original main converter
Turbo Downpipe This pipe replaces the monolithic converter and bolts direct to the original main converter. The first 6" are cast 2 1/4", then it goes to 3".
EXHAUST DOWNPIPE 87-92 TB W/OEM CAT 3103-RZ003 $299.00


Never mind I found the corksport one! only $169 that's friggin awesome!!!

 

that's another reason i'm glad i had to make my own... i was able to have it 3" directly from the turbo all the way back.

and yes, Rene is the rx3mist guy. amazing welder and great turbo header fabricator.... amongst other things.

 

*cough*

 

does anyone have some up close of a compleated blow through installed. I've seen a lot o progress pics, but I'm looking for some finished pics. Thanx

 

those aren't too up close... but they're a decent overview. i may get some close up pics today.