View Full Version : What is the standard Up pipe like?

Jolly Green Monster
28th January 2004, 09:57
As the board seems quiet and I am bored.. I thought I'd ask http://bbs.22b.com/ubb/smile.gif

Do I go to the effort of changing my up pipe?

I have ported standard headers fitted

I have an Up pipe which I believe was made by someone not too far away sat in the garage.. so no extra cost other than a 3/8 14mm socket and extention to get the blasted thing off http://bbs.22b.com/ubb/smile.gif

Will it effect the ecu map much?
Could the car be mapped to take advantage of it? or is the difference so minimal that it wouldn't notice?
It will be wrapped..

Rest of the car at the moment is:
Phase 1 open deck UK 2litre
Link ECU mapped by Pat currently only 1bar until the miss fire is sorted then 1.2bar max or 1.15bar.
FMIC, K&N Filter, 550injectors, H&S 2.5inch downpipe, centre and backbox.

Anyone like to guess power?

Cheers for any thoughts


[This message has been edited by Jolly Green Monster (edited 28 January 2004).]

28th January 2004, 11:57
Porting the up-pipe along with ported O/E headers will show noticable gains if done properly but is a lot more than just an hour with a Black and Decker and file.
For your spec I think you will get noticable gains from the up-pipe porting.
Gas velocity is very important and too big an up-pipe with a small(ish) turbo will result in a loss in performance. When you get the O/E off you will actually see the internal diameter is much smaller than the O.D.
From experience of fitting the larger diameter Gruppe 'S' I think it is a retrograde step until somewhere beyond 350 bhp ish. There are of course plenty after market smaller diameter up-pipes.

Jolly Green Monster
28th January 2004, 12:02
Thanks Harvey,

The ported headers did show gains when I fitted them, at the time I only had a scoobyecu and the H&S exhaust..

I wouldn't have said the uppipe I have to fit is particularly a big diameter and it was on Steven's wagon showing good power so it must match the ported headers well too, as they came off his car too.


28th January 2004, 13:37
The only thing to watch is the standard up pipe has a habit of splitting around the expansion joint where there is 'concetina' style stainless steel section. If this is blowing you end up over spinning the turbo to get boost (you'll notice that you have a split pipe when can't hold the car on boost)

If you fit a solid up pipe the lack of an expansion joint can sometime cause the up-pipe to manifold gasket to fail on a regular basis http://bbs.22b.com/ubb/rolleyes.gif

Jolly Green Monster
28th January 2004, 13:40

Thanks.. very informative and I believe it is an uppipe you made that I have to fit http://bbs.22b.com/ubb/smile.gif

I don't believe it is blowing at the moment but the original uppipe has done some miles so it probably will at some point on that flexi joint no doubt..



28th January 2004, 14:02
Oh gawd....

Erm, check that the flanges are flat and the holes all line up before you fit it, some of the flanges weren't great http://bbs.22b.com/ubb/frown.gif

Jolly Green Monster
28th January 2004, 14:05

It all looks to have nice flanges..

So how would you compare it to the standard one flowwise?

Is it worth me fitting now you know that..

lol http://bbs.22b.com/ubb/smile.gif

Simon http://bbs.22b.com/ubb/biggrin.gif

28th January 2004, 14:51
Always on hand with some Piccys.. http://bbs.22b.com/ubb/biggrin.gif


Hope that helps Simon,
You may have to squint a bit on the end view of the two pipes as the cabon deposits on the OE one makes it difficult to see the actual ID size..


28th January 2004, 14:53
oops not the reduced web versions, no wonder they took a while to upload. http://bbs.22b.com/ubb/rolleyes.gif

Jolly Green Monster
28th January 2004, 14:54
Thanks Andy, that looks spot on like the one I have sat waiting to go on..

I best get around to fitting it then.. http://bbs.22b.com/ubb/smile.gif


29th January 2004, 13:34
Simon, it's a slightly larger bore than standard from memory, so at the low end it might slug spool up, but flow more air as the revs climb.

Check the top flange against the exhaust housing if you can...

Jolly Green Monster
29th January 2004, 13:41
Thanks Tim..

Slower spool... might leave it as it is then as I like the way the car drives at the moment.. hummmm...

Won't rush and fit it then, might wait until it is warmer and try it and see, less of a pain to take it back off if I don't like it in the warm.. lol.

Not that I have much chance to drive it since the remap but turbo is spooled around 3000rpm at the moment.


17th February 2004, 13:05
I've never thought that the std up pipe was as bad as some made it out to be. The main problem was where the inner tube sleeve had a lip but this could be ground down or bent outwards to lessen the step.

Same goes for the header slip joint too.

F (veteran of 2 full porting jobs with pics).