Where does the K04 come from?

[NSX]

A couple of questions here, first of all, what car does the K04 come from, and why do I only have a K03?

I have heard that they are the same size turbine, but the blades are more aggressive on the K04, is that true?

Also, from what I have found, the stage 1+ ecu and bigger fuel injectors delivers roughly the same amount of power as a K04 setup, just 10 or 15 hp & ft-lbs less.

[Howard Hughes]

K04's are made by Borg Warner same company that makes our stock K03's, you can source them just as you would any other aftermarket turbo. The turbo is exactly the same externally but the blade pitch is infact more aggressive.

Horsepower is about what you stated above but there is more torque.

[Syrus5o]

Ko4s can be found in the TT, b5 rs4 and the c5 rs6 (which everone was the v8biturbo) There are a few different variations in each of those ko4s some make more power than others.

[docurley]

Ko4s can be found in the TT, b5 rs4 and the c5 rs6 (which everone was the v8biturbo) There are a few different variations in each of those ko4s some make more power than others.

But on the the aftermarket K04-15 will fit the A4.

[hlgladiator]

I think it comes from a stork.

As far as power, you get more HP, not more Torque. It doesn't really boost more (unless you want it to), it just holds boost longer... a K03S might die off at 4.5-5k (sorta made those numbers up), but a K04 will hold it. I've never gone past maybe 6.5k with my K04, but it holds it at least that long. Thus, all the extra power is at the top end - meaning more HP.

At least, from what I know about these things and my own first hand experience, I think that's right =P

[Syrus5o]

I considered a K04-15 for my gti years ago, I thought it was supposed to give about 10-15 more hp and 25-30 more lb/ft than my ko3s. Possibly even more tq than that with good tuning. I ended up going with a 2871r. oh well

[Greg@DTH]

A lot of misinformation here...

Our A4 (longitudinal) uses a K04-015, it is not found on any OEM Audi or VW applications, the turbos are made by Borg-Warner, which is a company that bought up both KKK turbo and Schweitzer turbo.

The K04-001 is the OEM turbo used on the Audi TT225 and S3 (transverse motors).

Be very careful sourcing your K04-015 right now as there are many Chinese knock-offs floating around right now.

[maxspeed]

k04-015 was used on the eurospec TDI golfs.

[Greg@DTH]

Guess again, the PD150 golf is transverse and they used a Garrett variable vane turbo p/n 038 145 535 E

[docurley]

A lot of misinformation here...



The K04-001 is the OEM turbo used on the Audi TT225 and S3 (transverse motors).

They also use the K04-023

[Capt. Obvious]

Well you see, when a daddy turbo loves a mommy turbo very much, sometimes they make a baby turbo...

[Greg@DTH]

the funniest thing is that is what I was thinking when I saw thew thread intro

[davidlizard]

Germany!

[docurley]

Germany!

Funny that because it's cheaper to buy them from the US then by them here in the UK

[NSX]

Thanks for the info guys. You sure haven't made the K04 sound like the obvious choice for me.

I was thinking of doing a Unitronic stage 2 setup with 386cc injectors and a dual side mount intercooler setup, and just letting my humble K03 blow all that it can blow.

[FORCE_FED_DUB]

[QUOTE=Greg@DTH;3587254]

The K04-001 is the OEM turbo used on the Audi TT225 and S3 (transverse motors).

QUOTE]


No, K04-02X for 225hp motors (TT, S3, Cupra R)

i would guess the K02-001 was used on the 210hp Leon, but i'm having trouble backing this up, in fact i'm finding forum posts that says ALL of the 210/225 models used the -020/021/022/023 turbos (020 and 023 being "unsilenced")
∴ i am probably wrong in my assumption

[GreyGhost]

I think it comes from a stork.

As far as power, you get more HP, not more Torque.

At least, from what I know about these things and my own first hand experience, I think that's right =P

nope, not true

low end torque of my K04-15 set up was 85 ft/lb more than 1+,
(tho this is comparing K04-15/miltek HFC and exhaust to 1+ and DSMIC only)

tho at the upper RPM's it was more like 25 ft/lb

see below