OEM RS6 Turbo vs. K04 RS6 Hybrid

[Luke01S4]

Are there big differences between these 2 Turbos?

[EUROTEK//S4]

Are there big differences between these 2 Turbos?

+ 2

[Das General]

+ 2

+3 This topic has never ever been covered before in the history of forums..

[ubermidget]

haha yes there is...try searching

[EUROTEK//S4]

stock RS6 tubos only fit the RS6...RS6 KO4 fit the stock B5 S4 ? on VAST website they list them as RS6 KO4 tubos...

[Only1Z]

K04/RS6 hybrids or K04/997 hybrids will not make near the power of full RS6 turbos. RS6 turbos net roughly 80 whp more than plain jane K04's on 93 octane. Hybrid K04's are more like 20-30 whp over plain jane K04's with questionable reliability. There is a considerable difference.

[Sleeeper X]

RS4 / k04 are ko4 turbos

k04 rs6 hybrids are k04s with an rs6 cold side

rs6's are the turbos that come on an rs6

k04/rs6's are pointless. the rs6 cold side is slightly bigger then the k04

The restrictive part on the k04 is the hot side NOT the cold side.

If you want bigger turbos get RS6's or GT2560's or bigger.

[Luke01S4]

Ok. What about K04+full RS6 ChRA's+997 compressor wheel will this = OEM RS6?

[CTS Turbo]

FYI, RS6 turbos are also K04s, just like K04-001 for VW 1.8T, K04-015 for Audi 1.8T longitudinal, K04-20/23 for the TT225HP, and K04-025 & 026 for RS4.

I don't have the part #'s in front of me, but RS6 turbos are also from the K04 family, just like a 50trim and 60trim can be from the T4E family.

[rouellettea4]

rs6's are the turbos that come on an rs6

RS6 turbos are KO4 based too.

[ladedruck]

rs6 are k04-028 and 029 I believe.

[AMC]

Are there big differences between these 2 Turbos?

full rs6's have to be modified to fit the s4, hybrids dont but since the hybrids are being modified it makes no real difference.hybrids have rs4 k04 hot sides while the rs6 k04 has a bigger hot side therefore better, etc. you gain more hp with the full rs6's but i would strongly suggest to build the motor if u go full rs6's

[EUROTEK//S4]

RS4 / k04 are ko4 turbos

k04 rs6 hybrids are k04s with an rs6 cold side

rs6's are the turbos that come on an rs6

k04/rs6's are pointless. the rs6 cold side is slightly bigger then the k04

The restrictive part on the k04 is the hot side NOT the cold side.

If you want bigger turbos get RS6's or GT2560's or bigger.

which RS6's does ASP and VAST/JHM sell ?

[AMC]

which RS6's does ASP and VAST/JHM sell ?

WOW you are pathetic and cant read for SHIT damn dude. read the description on the site!


JHM
here to help you out.
http://www.jhmotorsports.com/shop/ca...products_id=18

now,
"These are OEM RS6-K04s from the V8 RS6." (first sentence!)
'2-new modified OEM RS6 turbos modified to bolt on to a 2.7t" (second sentence!)

ASP
http://www.autospeed.us/store.php?cr...on=show_detail

"When your factory K04's just are not enough and it's time to take it to the next level, the ASP RS6 Kit will take you there. Using factory KKK RS6 turbochargers from the 4.2L RS6 modified for mounting purposes only, we increase the output of your S4 once again. This Kit is turbos only for those of you that have other means of tuning "


that help?

[Luke01S4]

but i would strongly suggest to build the motor if u go full rs6's

I know that, but how it works with RS4 Motor, aren't RS4 rods strong enough to handle more power?

[rouellettea4]

I know that, but how it works with RS4 Motor, aren't RS4 rods strong enough to handle more power?

!!!!!

WTF, READ! they come from a RS6, not an RS4, not even relatively close to the motor you are bolting them, and running more boost than what they originally were, hence harder on the smaller motor. Therefore build the motor. Jesus chirst, I'm going to sleep, sometimes AZ makes me want to punch myself.

[Luke01S4]

!!!!!

WTF, READ! they come from a RS6, not an RS4, not even relatively close to the motor you are bolting them, and running more boost than what they originally were, hence harder on the smaller motor. Therefore build the motor. Jesus chirst, I'm going to sleep, sometimes AZ makes me want to punch myself.

WTF, what is your problem dickhead, you don't know how to read

[Luke01S4]

AMC thinks that I have S4 Motor and he said to build it ok, but I have RS4 motor

[Luke01S4]

The thing is that my k04's are used and they have about 30K on them. So I'm thinking of rebuilding my K04's with RS6 CHRAS and 997 compressor wheel or I can sell my K04's and buy OEM RS6 turbos. I'm not feeling like changing it later and pulling the engine again.

[AMC]

AMC thinks that I have S4 Motor and he said to build it ok, but I have RS4 motor

ok you have an rs4 motor. im not exactly sure how strong the internals are but i believe they are stronger than the ordinary s4 motors so im guessing youll be fine with full rs6's. hope someone can chime in on if your motor is strong enough

[okkim]

RS4 motor is fine to about 650 hp.

[loomx]

RS4 motors are much stronger than S4, they will run with RS6 turbos no problem.

[pit viper]

rs6 are k04-028 and 029 I believe.

Yep.

[Luke01S4]

Who does good job rebuilding turbos? I need to put RS6 Chras and 997 wheels on my k04s?

[BastardS4]

ok you have an rs4 motor. im not exactly sure how strong the internals are but i believe they are stronger than the ordinary s4 motors so im guessing youll be fine with full rs6's. hope someone can chime in on if your motor is strong enough

The internals are the same. At least that's what i have always been led to believe.

[Chknkatsu]

are There Big Differences Between These 2 Turbos?

Can I Has Your Car?

[WMi_S4]

Who does good job rebuilding turbos? I need to put RS6 Chras and 997 wheels on my k04s?

VAST, Kinitec, search maybe????

[Boris]

RS4 motors are much stronger than S4, they will run with RS6 turbos no problem.

Are you guys sure, I thought the part number for the con rods were the same as our engine.

[okkim]

No the con rods are not the same. Look at this thread:
http://www.audizine.com/forum/showthread.php?t=175780

The internals are the same. At least that's what i have always been led to believe.

If you don't know, don't say what you believe.

[Audi S4 Turbo]

What are Rs4 PJ K04s compared to in Garrett terms? Like Gtxxxx?

[Boris]

No the con rods are not the same. Look at this thread:
http://www.audizine.com/forum/showthread.php?t=175780

That threads only mentions the con rod bearing, not the actual con rod. Is the actual con rod stronger? I wonder how much stronger than ours? thanks for the link btw, good info.

[Luke01S4]

Now I'm confused. So are the RS4 com rods stronger enough to handle RS6 turbos?

[falcon1]

Yes, the RS4 engine has different rods, pistons, crank, block and heads then an S4. The rods will support RS6 turbo's, the reason the bearings are different is that they use different/stronger rod bolts. Thus they use thinner rod bearings to keep the rod the same width on the big end.
All that being said, are you sure the engine has not been torn appart to keep the good parts from the inside? If you have a complete RS4 engine it will run fine with RS6's and new tuning to support them.

[Luke01S4]

OK, thanks Falcon1 for the info

[Luke01S4]

are you sure the engine has not been torn appart to keep the good parts from the inside?

What do you mean? go to my thread " Ho Ho Santa Was Here" I have some pic of it there

[Swank4]

Guys - it all depends on how much boost you want to run. You can slap any turbo you want on a stock block but you'll just be limited to how much power you can put down before things start to break.

I currently run OEM RS6-K04 turbos on my B5 S4 - STOCK BLOCK, 91 pisstane - with a custom tune that uses a boost profile in the 22-23 psi range. I flow about the same air as some of the more aggressive OEM RS4-K04 (or even hybrid) turbo cars (which also run on stock blocks just fine). The main thing is that our power levels are still within what's considered to be safe (~500 whp).

Autospeed and VAST have been selling the OEM RS6-K04 turbos for a while now. Some people put them on a stock S4 motor while others build up their motors (usually rods). Those who build up their motors can run higher boost (~28 psi) and see very nice numbers.

The main reasons why these became popular for the 2.7T are:
1) only slightly more expensive than RS4-K04 turbos; no shortages
2) definitely cheaper than hybrid K04 turbos (ex: K04/K16, K04/K24, K04/RS6, K04/997) because there's no rebuilding that needs to be done.
3) less reliability issues to worry about than with hybrid rebuilds (Buehn Engineering left a lot of people dissastisfied....although Blouch has taken over as a highly reputable rebuilder).

I don't consider myself to be an expert but hopefully that answers some of your questions. Basically, to me it makes sense either to stick with OEM RS4-K04 turbos (if you want a simple daily driver and/or want to save some $$) or pay a little more for RS6-K04 turbos. No sense in hybrids anymore (IMHO). You lose a little in turbo lag with the RS6 (~500 rpm) but they pull to redline whereas the RS4 tapers off a bit up top.

[spa]

^ i am on the same page, well said.

[dannyn424]

the rs6 turbos are 50% more than k04's... that is not a little bit more........

[pit viper]

the rs6 turbos are 50% more than k04's... that is not a little bit more........

Which I still find a bit funny, as the dealer list price on RS6's is approx. $90 more per turbo.
Granted, there needs to be a little work done to make the RS6's direct-fit, but not enough to justify $1000+ more for the set of turbos, IMO.

[BastardS4]

sigh.