First 3" SS custom downpipe ready !!

[Greg_S]

Got mine thru from marco the other day.

Need to make a few mods to it though. Gonna put another mount on it so i can fit an EGT into it and also need to go over the lamda hole with a tap because the threads have tightened up slightly which shouldnt take long.

Marco when fitting another mounting for the EGT on doe it have to be SS that i fit to it? and what kind of welding rod do i need?

ta

Greg

[Pisobiker]

Greg, are you sure about the thread? After welding the fitting I have put my spare lambda probe on to make sure it was all right and thought it was fine.
If you put another fitting it isn't necessarely needed a SS one, I made them out of SS because I didn't like the idea to ruin my work with a .... "rusty" iron bolt .
For the EGT probe, anyway you will probably need a much more common thread so finding a off the shelf SS nut shouldn't be a big problem.
Doesn't matter too much what SS alloy welding rod you use. Pipes are out of #304 SS so you might ask rods for it.


Hope you're satisfyed with it. I did my best and think the result should be pretty good (I mean the pipe needs to provide good flow with smooth section increase from turbine flange and best possible merging of WG pipe on main flow, which is what I put most attention at).


Marco


P.S. did you get my "instruction sheet" I sent to you by email?

[Pisobiker]

Ant,

I have built three 76.1 mm (3") downpipes and one 70mm downpipe so far and still have to make two. If you want one I can probably have it done around the beginning of next month.
For a RS2 EM and turbocharger setup I'll recommend the 76.1 mm pipe (and full 3" system). This will allow to get full pontential out of the RS2 setup with the aid of Paul N. and Mihnea's chipping .


Marco

Originally posted by S2 Ant
How much bigger is than the the standard Downpipe??

Have sorted out my money situation and am now on the hunt for more power...

Am looking to get an RS2 EM and turbo prob same as Greg's as was v impressed when i've been out in that.

I assume your DP would be worth fitting on to this setup???

Plus means single pipe and no split and at that price!!!!

[S2 Ant]

Does the top of the DP depend on what turbo its going on to or are they the same size?

As im undecided as to whether i want an RS2 Turbo or a bigger one.

Am def interested tho!!! Thanks

[Pisobiker]

Ant, of course position of flanges and dimension of turbine one depend of which turbocharger you are using and which EM as well.
The one having RS2 specs should be fine with both RS2 and 3B/ABY/AAN EMs, while working fine with the OEM KKK K24, K24 7200 (RS2). For the bigger K26 #8 or #10 turbine housing (like the K26/27/29) outlet flange might be bigger with larger bolt patterns as well, but I don't know this for sure, Doug might help with this.

Of course aiming to much over 400 Hp (therefore going with a bigger than RS2 turbochargr), might be worth going with a upgraded EM like QS one or custom tubular ones, which will need a different DP which will be very difficult to make not having phisically both EM and turbo.
Once exceeding the 450 hp mark in my opinion it should be seriously considered going even higher than 3" in Ø.

Anyway, about the question on your previous post (which I forgot to answer), OEM S2 downpipe is 62mm internal, RS2 one is 66mm internal, and both split into two 50mm internal.
What I was really surprised (negatively) of the OEM downpipes (both S2 and RS2) anyway, was the very poor merging of the WG duct to the main pipe and the bottom splitting, with very rough cuts and lips which should give a lot of flow restrictions.


Marco

[S2 Ant]

Thanks Marco.... As soon as i know what turbo i'm gonna go for then i'll let you know, it will be going on an RS2 EM tho, not going for massive power (not yet anyways) 400 will prob be the max, cos after that it all gets silly on bits and prices LOL

[audiman]

Ant, if you are buying a new manifold then think well into the future! I made that mistake, i bought a brand new RS2 one from the stealer. I wish i had searched for a SQ manifold as this is soon gonna be my limiting factor in the setup. Also turbo choice is very important, depends if you cane it upto the redline all the time, or do you like just low down torque? Too big a turbo and you will be forever changing down a gear!

[S2 Ant]

AFAIK i thought the SQ manifold was LOADS more £££ than RS2....

Its my Wallet thats my limiting factor

[Doug_RS2]

My turbo mates upto the standard EM and standard DP.

If you are planning to change rods and going over 440bhp, 600Nm I would bother with going for a better than RS2 EM.

Ask Marco nicely how much his tubular manifold and DP to go with it will cost.

Cost is stopping me at 440bhp and maybe 600Nm

[audiman]

But for just a few hundred pounds more, it looks bling and flows so much better, may even help to reduce a bit of lag? And if the rods are done then why keep to a limit of 440bhp. 400 is possible with stock rods AFAIK

[Doug_RS2]

You need a custom downpipe for a tubular manifold. You will also need to lose your airbox and reposition your filter - like Marks.

It does look the danglies though - you have to decide now whether 400 will be enough - if it isn't go the route Mark has gone.

Tom - what Turbo are you going to use for more than 440bhp?

[audiman]

Not sure, the one i have got will struggle with that output!! Should boost to 2 bar with ease tho. Your turbo will take it over 440 bhp, wouldnt it?

[Doug_RS2]

I think my hotside is 450bhp ish but the coldside is 500bhp+ - the belgian dude knows more about the limits than me.

You really struggle flowing more than 440bhp out of the EM - that's my limiting factor.

I was peaking at just over 2bar on mine.

I don't know how Mihnea thought I was maybe as high as 500bhp though