Manifolds and turbos

[AudiVWguy]

Hi,
I'm doing some research on what manifolds are compatible with what turbos.
For example, I have a K-14 turbo and manifold. I don't know what you call the shape where the turbo attaches to the manifold.
So, is the K-14 manifold all that good? What's better?
What turbo's share the same mount point?
It may help to include what engine/car the part came off of.
Pictures may help too.
Thanks for contributing to the knowledge base.
-JB

[mystery3]

I don't know what you call the shape where the turbo attaches to the manifold.

I'm guessing if it's not a rectangle then it's a trapezoid. I could be wrong I don't know much about kkk turbos aside from the k26 on my old 5kcsq.

[jack's lack]

yup K14 is a trapezoid


outlet looks like this bolts are basically in a square pattern

FAIK there are several different shapes for where the different turbos attach to the manifold, but I think all the 8V VW's have the same exhaust ports on the head. So just make sure you score the manifold w/the turbo. The annoying thing is that the oil plumbing is often different too.

HTH

[GEE-BEE]

t2,t3,k14,k24 all use the same  downpipe

Ko3 is different, on intake and exhaust

GB

[AudiVWguy]

That's good to know about the down pipes.
The picture in Jack's Lack post is what I'm talking about.
What all bolts up to that?

From an efficiency stand point, how is that manifold?

Also, reading the archives, It seems that there are two sizes of K-14 (the Eco size and the 1.9 AAZ size)

Does anybody know some kind of hierarchy of the turbo's we commonly use around here?

[VW_Commuter]

Does anybody know some kind of hierarchy of the turbo's we commonly use around here?

That's an answer that I'd be very interested in also and maybe should be made in to a FAQ post.

[AudiVWguy]

Can anybody contribute knowledge as to hierarchy of sizes of some of the turbos we use. How would you arrange these?
T2   T3    K14   K24   (K26?)  I'm sure there are a lot more. It would be great to add technical info to go with each model.

[rallydiesel]

Keep in mind there are a lot of different a/r and trims for particular turbo "frames". Especially once you stray from vw spec stuff. For example, there are tons of T3 turbos out there.

[MJF]

If we are talking of stock VW turbos, K14 is pretty much same size as T2. Just like K24 and T3.
Others can be very different sizes, for example my Mercedes K14 is much larger than old Mercedes K26.

[AudiVWguy]

I think we should keep the comparison to turbo's that would bolt to VW diesels (Oil Cooled). That way you don't have to retrofit water lines to the turbo. That being said, I'm sure there a lot of choices of that fit the oil cooled category.( You guys in Europe probably have the most choices.)

MJF, that's interesting, so the Mercedes version of the K-14 is larger than the VW AAZ K-14. I'll get the inlet and exhaust diameter openings, if maybe you could the same.
My K-14 doesn't list a/r and trim on this one (maybe somebody knows). More importantly, if someone understands the whole a/r trim thing, that would help with our comparison. I don't know if there is an easy way to explain this, but if someone would try.

[AudiVWguy]

I took some pics of the IHI VF14 and the K-14

the VF14


 
And the K-14



It would be interesting to see if the slightly larger exhaust side on the VF14 would equate into lower EGT's than the K-14.
Anybody else have pictures and sizes? Please contribute.

[MJF]

Installed the turbo just a moment ago, measured too. Compressor inducer ~44mm and turbine exuder ~46mm. It is from MB 300 24v diesel.

[AudiVWguy]

Thanks MJF, I realized when I measured mine I only measured the hole diameter. I reshot the turbos and labeled them. These are similar in size, but how can you tell which will be a better design? Different number of fins, different designs. I found a compressor map for the K-14, but nothing for the VF14.

[RadoTD]

That's interesting.. not trying to derail this, but I wonder if the K14 having more fins makes it spool better than the VF14 with a diesel's low CFM? My K14 is much more responsive than Ed's T3 and they have a similar compressor map

[R.O.R-2.0]

That's interesting.. not trying to derail this, but I wonder if the K14 having more fins makes it spool better than the VF14 with a diesel's low CFM? My K14 is much more responsive than Ed's T3 and they have a similar compressor map

how could a K14 and T3 be similar? one is WAY way bigger than the other. a K14 is equivalent to a T2, K24 being equal to a T3. K26 being equivalent to a T3/T4?

i hate to argue with you about turbos, but i just dont see it possible to have them be even close to similar.