Exact K03/K04 turbo specs

quickblack_06 · Jan 10, 2009

I've been searching and reading around on here for a couple days, and I've heard: "bigger, smaller, xxxhp, yada, yada".....and it's not helpful. I even downloaded and read the entire Design and Function .pdf that is stickied. It's nice, and the pinout's are handy, but really not very technical.

I want to know the exact specs on the stock K03 turbo and the exact specs on the K04 turbo. And I want to know if there is only one "K03". I've heard people say there are different "K04" turbos available...so I'd like to know how many different "K04" turbos there are...if any.

All I've found on the web for the K03 is an 81trim turbine/51.8trim compressor. And it was on a website that was not entirely English, lol. Is it too much to ask for the trim, A/R, and overall diameter of these stock turbo's? Thanks in advance! :thumbsup:

mose6161 · Jan 10, 2009

try calling apr. don't know if they'll tell you, but they probably know the specs on k04's

SoNgMaN · Jan 10, 2009

lot's of variant of both turbos.

can't say i've seen the exact spec of our "k03"

quickblack_06 · Jan 10, 2009

Ok, so there are several varients of both turbos. I have to assume that since they keep the same names (K03 and K04) the K03 housing is the same no matter what, and the internals are different among variations? Same goes for the K04?

It doesn't make any sense for there to be a K03 turbo that has both a different housing and different internals than a different K03....and they both be called K03. :iono:

SoNgMaN · Jan 10, 2009

right. afaik th k03 and k04 housing are the same size. there are different names for the turbos though, the 150hp 1.8Ts had a "k03" and the 180HP 1.8Ts had a "k03s"

John/Cue\Publik · Jan 10, 2009

I believe the k03 in the 180hp 1.8T was actually a K03 sport which proved to be more reliable as well as offering a little more power. Anyone with an early 1.8T wolfsburg Jetta can tell you about the wondrous ability that engine has for sludging the crap out of oil.

Arin@APR · Jan 10, 2009

Here are the different versions out there for the TFSI engine from Borg Warner:

K03 - Transversal setup
K03 - Longitudinal setup
K04-64 - GTI ED30/TT-S/S3

The only other tuber that was offered that different from those above was a motorsport k04 we were able to bring to the market. It was somewhere between the k03 and k04. It's now out of production.

The TSI engine now has a different k03 turbo setup from IHI.

ace009 · Jan 10, 2009

Arin@APR said:
The TSI engine now has a different k03 turbo setup from IHI.

Good info...:thumbsup:
I wonder how this compares (specs wise) to the IHI turbos used on Subarus.

quickblack_06 · Jan 11, 2009

Arin@APR said:
Here are the different versions out there for the TFSI engine from Borg Warner:

K03 - Transversal setup
K03 - Longitudinal setup
K04-64 - GTI ED30/TT-S/S3

The only other tuber that was offered that different from those above was a motorsport k04 we were able to bring to the market. It was somewhere between the k03 and k04. It's now out of production.

The TSI engine now has a different k03 turbo setup from IHI.

Nice to know. I suppose you guys at APR have had both K03 and K04 in hand many times. Do you have the specs on them? I'm horribly curious to know.

I realize now that they're both itty-bitty tiny turbos. I assumed when I bought my GTI that a standard and highly available turbo upgrade would consist of a manifold/turbo/exhaust capable of flowing 350-400hp. I guess I assumed wrong. I've got 9k miles of warranty left...and after that, I'm finding a turbo that'll make 350whp without breaking a sweat. I'll even fab a manifold if necessary...there's not really a ton of room between the firewall and the back of the stock turbo.

I bet this wouldn't fit...

leviathan18 · Jan 12, 2009

well there are plenty of turbo upgrades K04 gt28 gt2871 gt3071 gt35

i know we have the K03 sport which the housing afaik is the same as the K04 but exact figures dont know i could try to find them

Arin@APR · Jan 12, 2009

Unfortunately BW spec sheets are not something we can give out. Trust me, I was in your shoes once asking the same questions. I wanted any info I could get my hands on.

the K03 is small, but the K04 isn't. Back on the 1.8T the k04 was a very mild upgrade, but on the 2.0T it no longer is. It's a about the size of a GT28RS and is good for a bit over 300 hp on pump gas. You'll be able to safely put down 20psi of boost with it till about 5500 rpms. It starts to to about 15-17 at redline.

Our own Stage 3 kit, which uses a GT2871 will do around 350 wheel on pump gas and around 400 on race gas. This engine has fairly high compression so getting above 350 w/o any internal engine work or chemical adders is not something you'll see with pump gas alone.

lour32 · Jan 12, 2009

Arin@APR said:
Unfortunately BW spec sheets are not something we can give out. Trust me, I was in your shoes once asking the same questions. I wanted any info I could get my hands on.

the K03 is small, but the K04 isn't. Back on the 1.8T the k04 was a very mild upgrade, but on the 2.0T it no longer is. It's a about the size of a GT28RS and is good for a bit over 300 hp on pump gas. You'll be able to safely put down 20psi of boost with it till about 5500 rpms. It starts to to about 15-17 at redline.

Our own Stage 3 kit, which uses a GT2871 will do around 350 wheel on pump gas and around 400 on race gas. This engine has fairly high compression so getting above 350 w/o any internal engine work or chemical adders is not something you'll see with pump gas alone.

Hey Arin is there a big difference from APR stg2+ to K04? 20 psi to 5500 rpm then tapers down to 15-17 psi is pretty good! My APR stage2+ tapers down to like 8-10 psi.

Little_Red_Fast · Jan 12, 2009

Hey Arin, You wouldnt happen to have a side by side pic of the K03 vs. K04 to see the size difference or are you talking about the internal size? I am so confused about which turbo to go with, and then REVO will soon be coming out with tuning for ATP's turbos, and I heard the PAG Parts will have a kit too. There is just so much to choose from.

Another thing is that I have checked out GT2871 and GT3071 compressor maps and have mapped the operating range on both and it appears that the GT2871 either crosses or goes beyond the surge limit to the left of the graph on the graphs I have gotten from tubobygarrett.com. I have been reading Corky Bell's "Maximum Boost: Designing, testing, and installing turbo charger systems" for a few weeks now and have plotted my operating range as he explains it, but perhaps I am not taking some things into account. Please help me out man!

Chris@RT · Jan 12, 2009

I can't find any of my notes and packed up most of my turbo parts a few months ago so measuring them easily won't happen for a bit.

However the KO4 for the 2.0t is closest to a GT28R not the GT28RS.

Again I can't find my exhaust notes so I do not have the details however the inducer or exducer was exactly the same size whichever one was not the same size was only .5mm larger on the GT28R than on the KO4.

Completely blanking on the turbine wheel stuff.

But that being said size doesn't matter (had to say it). It does but there are other factors. You can have two wheels identical in inducer and exducer but if the blade pitch, count and height are different you'll have different characteristics. Same goes for the housing specs which are much harder to compare then just wheel sizes and change the characteristics of the turbo as well.

Chris@RT · Jan 12, 2009

This is some random t3/t4 forget which.. GT28R and then a stock turbo

Not the best pic but gives you an idea.

Exact K03/K04 turbo specs

quickblack_06

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