dbman96

Hi all - new to the audi community but we may be getting an A4 1.8t for a test rig here at work (sadly we only have a 2wd dyno so we can't get a quattro).

I was curious about the K03 turbos - being unfamiliar with the KKK lineup but more familiar with Garrett turbos I know that the Garrett center housing is interchangeable between several lines - you can bolt a T4 compressor onto a T3 turbine with very little effort (hence the ever-popular T3/4 "hybrid" turbo); I was wondering if anything similar is possible with the KKK lineup; I know the stock K03 "tops out" at around 12-14 psi before it turns into a heat pump and I was curious if it's possible to swap a bigger compressor on without swapping the whole turbo.

Thanks in advance!

RedBlackYellow

the k04 has a bigger compressor and people have switched this out into the matching k03 and k04 turbo housing. i dont know how they did this but they have

1-BAR

will "bolt-on" to the stock manifold. If you are going to change out your turbo to a K04 or variation of you should get a ported manifold to go with it. Dynospotracing, SPP and Works of Art all have one.

Sourdough Josh

have yet to get confirmation on this. I read somewhere that they are, and Audi's info is sketchy at best. They use the hybrid in some of their VW line.

1-BAR

, they do however share the same exhaust side to prevent cracking which has not been a factor for more hp.

Toaster29

heh, here we go again NO spinning K04 parts in ANY K03.....period

dbman96

Mixed signals here, eh? If K04/03 hybrids exist then they either share a center section or they are very very similar. I've got a full machining facility at my disposal if I decide to try this, so I could probably make a custom backplate, even custom shaft, for that matter, if that's what it took to fit it. I realize the K04 is a straight replacement for less trouble but there is a good reason that I'm trying to find out about options with mounting different compressors on the same center section. If I can get a 04 compressor bolted onto an otherwise standard 03 turbo, I have a feeling some very very good things will happen.

Toaster29

well pass one my way if you decide to go for it and I'll be tester #2