1.8T engine conversion costs

[F17BAD]

Some people on here need to go away and do some research (try club GTI)

Too much flow = no go but anything less than 2.5 is BAD idea. The standard mk 3 systems are leas than this and so are most aftermarket systems except jetex hence why moat people run them

The comment about 4-2-1 Downpipe made me LOL - obviously you are not familiar with the AMK/BAM and probably the rest of the 1.8t platform

[F17BAD]

http://www.clubgti.com/forum/showthread.php?t=238179&highlight=Exhaust+size

[Agreeable Slick]

Yes some people do.

Well it's an informed answer, for those that wish to make up their own minds and possibly do a little more reading in to the first principals behind exhaust gas flow, but I was just a tier 1 OEM engine developer, what do I know.

BTW that link just proves what I just wrote. Start big (manifolding) and go smaller (exhaust) - venturi effect.

[F17BAD]

Yes some people do.

Well it's an informed answer, for those that wish to make up their own minds and possibly do a little more reading in to the first principals behind exhaust gas flow, but I was just a tier 1 OEM engine developer, what do I know.

BTW that link just proves what I just wrote. Start big (manifolding) and go smaller (exhaust) - venturi effect.

No what I linked to is what I said in my original reply and is what I'm running. You went on about 4-2-1 and all that. Which is irrelevant to this application. Not doubting your knowledge but some of the stuff said is pointless info

[Diamond Hell]

Well it's an informed answer, for those that wish to make up their own minds and possibly do a little more reading in to the first principals behind exhaust gas flow, but I was just a tier 1 OEM engine developer, what do I know.

The thing you don't understand is what happens in the real world.  You're just talking fancy speak aren't you?

As eny fule kno big exhausts = good, small exhausts = bad.

Where are you getting your info from? Have you tested small systems on cars using test data or dyno analysis ? What about EGTs?

Our survey said 'ding'. 

Just cos it's buffed up, don't make it fast, boys.

[F17BAD]

So we agreed what I originally said

2.5 to 3" Downpipe mated to a minimum 2.5" exhaust

Any less is too small for this application and a moron thing to do

[tshirt2k]

[F17BAD]

 

[Diamond Hell]

If not bright enough to form an intelligent response then = your Mum 



£10 says Danny and I could convert my Corrado to 1.8T for under a grand, easy.

But then, we're not mincers.

[Agreeable Slick]

Just to confirm, most VW 1.8T's are 4-1 with an incorp turbo (or at least the mountings for one) as far as I know. I could be wrong, as I haven't worked on many.

The 4-2-1 comment was more as an example in terms of trying to extract the best from the cars gas potential.

Ultimately if you want to get the best from the exhaust you really need to go to great depths in terms of honing the internal corners/joins/welds removing all possible parts that could cause turbulence. Stainless steels are the best option as they are naturally smoother purely because of material manufacture. Ideally if you can orbitally weld it using sleeve fittings it will help, but there will be inherent turbulence zones due to the shyte manifolding set up.

Go the whole hog and get the turbo relocated with a bit more manifold tuning. Equal lengths and gentle radii are key.