Different k04's?

[slopoke]

i see some people say to go 2001+ for replacing your k03, are there better years for a k04 or are they all the same?

[maxspeed]

k04 only came on the 225tt and wont bolt on to the a4

[MikeWasHere05]

k04 only came on the 225tt and wont bolt on to the a4

I believe it was the K04-001 that came on the 225tt. The K04-15 will bolt onto the longitudinal 1.8T.

[RobbyB413]

I believe it was the K04-001 that came on the 225tt.

TT225 would be a k04-20, -22, or -23, not a k04-001. Doesn't change the fact that it won't bolt up to our cars though.

k04-001:


K04-2x is on the left here:


k04-15:

[slopoke]

So Do I Need K04-15 Or Ko4-001?

[big_greasy_taco]

K04-015 is what you need

[317ssayzarc]

TT225 would be a k04-20, -22, or -23, not a k04-001. Doesn't change the fact that it won't bolt up to our cars though.

very nice robby, beat me to it! nice to see you on here as well as the 'tex

[savetheclutch]

I think he is confussing the KO3S from the 2001 model with a KO4-15.. The KO3S is decent but not as much as a KO4

[maxspeed]

the k03S is obviously much more k03-like in charachter, the k04 is a superior turbo compared to the k03S, but still lacking.

[317ssayzarc]

the k03, k03s and k04 (not tt225) all use the same compressor and turbine housings... how big of a difference does a few mm bigger compressor wheel make with the same turbine wheel? not too much lol

[maxspeed]

when all i had was chip/exhaust i was side by side with a 180TT (k03s) from 45 mph to 130, the difference is the k03s has a lower spike and holds a higher psi longer and the k03 has a bigger spike and dies of quicker, i feel that running software tuned for the k03s on the smaller k03 would be a big no-no as the turbine wheel is totally different

[317ssayzarc]

i feel that running software tuned for the k03s on the smaller k03 would be a big no-no as the turbine wheel is totally different

not sure if the longitudinal turbos are the same then, this is not the case in transverse turbos...

[kingtr]

thow big of a difference does a few mm bigger compressor wheel make with the same turbine wheel? not too much lol

Not exactly true. Can get another 35-40 hp and torque from aggressive K04 over K03. I realize its not GT series power, but it is still a significant difference, my last car was APR chipped/turbo-back exhaust K03 and my current GIAC FXK04 setup is far more torquey (which I realize some dislike) and doesnt die off up top quite as quick as the K03 (yeah it still falls on its face up top).

So I really think it depends on how/where the car is driven. Where I live with lots of stop and go, windy roads etc the powerband of the K04 is perfect for me. Of course I still long for a GT variant, maybe elim.

[audiness]

does anyone know what car the K04-15 is oem for?

[docurley]

does anyone know what car the K04-15 is oem for?

It never was; the K04-15 is a custom built turbo for the A4 engine which Borg make from time to time because of demand.