RS6 K04 - Upgrade Compressor Wheel Options?

[650RS]

Hi Gents,

Just wondering if the turbo gurus on this forum would mind sharing their knowledge with regards to what compressor wheels the OEM RS6 k04 housings can be modified to fit?

As far as I know the largest possible is the 59.5mm billet wheel known as the 8868?

The reason I am asking is I live in the other side of the world and I would like to look into getting a local turbo shop here to rebuild my standard turbos along with other modification, with regards to the other modification I am thinking:

- Clearances turbine housing around turbine wheel.
- Clearanced wastegate and increasing the wastegate flapp
- Upgrading the actuator to 0.8bar base pressure.
- Back cut the turbine wheel

Basically I am looking at building the most performance orientated turbo I can posible while retaining the OEM housings as i have looked into upgrading to GT's or some thing bigger and this requires nothing short of converting the car to manual along with other modifications. And yes this is for a genuine C5 RS6.

I look forward to anyones input and I appreciate you help in advance.

[Doug@FrankenTurbo]

So your local shop has the equipment to machine the compressor housings to accept bigger wheels?

[Raacerx]

You can fit a pretty large wheel in there, not sure of the exact specs though. This one has such a large wheel, and the inlet was milled so much, that the part of the inlet where the rubber seal sits to seal up the inlet pipe, had to be welded since it was milled out past this point. Its like paper thin.

[wdbdy2000s4]

You can call comp and verify the part numbers on the 59.5mm billet wheels...that's what they use last time I called Justin.

You could also throw in some k16 porsche wheels but the 59.5 billets are better.

[650RS]

You can call comp and verify the part numbers on the 59.5mm billet wheels...that's what they use last time I called Justin.

You could also throw in some k16 porsche wheels but the 59.5 billets are better.

I would appreciate some contact details for "Comp" ?

I would like if possible to buy the wheels so my local shop can do the rest of the work.

[wdbdy2000s4]

Here's the number for comp turbo: 909.841.0326.

[binhakeem]

Hi!
i saw you want to RS6 K04 - Upgrade Compressor Wheel Options?
did u done it
i want it too and i cant find anyone how can help for me.
best regards

ahmed

[MakkeS4]

Use k04- 2283 wheel. Turbo shop should know what is it. There is many threads talking hybrid rs6 turbos! With 2283 wheel you can use oem intake pipes and it is biggest wheel you can easily do it to rs6 compressor cover.

[DxC]

The new hotness is the 7 blade 2283 billet wheel. I have a few wheels I can send you for your project to test out

[itguy]

The new hotness is the 7 blade 2283 billet wheel. I have a few wheels I can send you for your project to test out

Increasing the blade count is helping spool but hurting the top end correct? Is low end response what you are going for with 7 blades? How does the extra weight factor in?

[Korben007]

Curious about this as well. Want a simple upgrade for my RS6

[ddillenger]

Mine:

2283 7 blade billet wheels in RS4 compressor housings with RS6 TFSI turbines and custom hot sides.

Running 14psi actuators.

ONE of these is capable of 350+hp on a pump gas 1.8t. My buddy Dan is doing them, and would be happy to do more if you ask nicely

[Korben007]

Would the rs6 compressor housing be any bigger? And wouldn't hot side design depend on size of engine they are being hooked to

[somedude]

so you are essentially looking for something like the silly rabbit turbos?

[Korben007]

so you are essentially looking for something like the silly rabbit turbos?

Im not sure. All those turbos are designed for a smaller 2.7L. I think the RS6 4.2L. Could handle some GT30s without a problem in the quick spool department, but physically won't fit without a manual swap.

[ddillenger]

Im not sure. All those turbos are designed for a smaller 2.7L. I think the RS6 4.2L. Could handle some GT30s without a problem in the quick spool department, but physically won't fit without a manual swap.

The SRM's use the RS6 hotside. I don't see how you'd get any larger without going GT, in which case like you said, manual swap.

[itguy]

The SRM's use the RS6 hotside. I don't see how you'd get any larger without going GT, in which case like you said, manual swap.

Any clipped turbine rs6 hotside, large compressor hybrid will be a decent improvement over the standard rs6 k04 on the 4.2.

[Korben007]

So would you say the SRMs are good for about 700hp?

And how would you go about getting then with the proper RS6 cold side outlets since these are configured for the 2.7t engine bay

[ddillenger]

You would talk to itguy (sean). He's the man behind SRM.

With that being said, I'd probably pick up a stock set and have those done at a local shop.

That, and I'd go 2283 over K24.

[itguy]

You would talk to itguy (sean). He's the man behind SRM.

With that being said, I'd probably pick up a stock set and have those done at a local shop.

That, and I'd go 2283 over K24.

The problem isnt the cold side, that is unchanged. The compressor housing is different. In order to use the normal RS6 compressor housings, you would need to find one with an extra thick inlet lip from the original casting in order to have enough meat left over once machined out for the larger wheel. This isnt an issue on the rs4 comp housings because someone paid extra money to have a thicker lip casting mold made. Due to the lack of demand with the rs6 variant, no one has made a mold with more inlet meat on the outside. You will be stuck with either paper thin inlets that will break off or going a route similar to loba where they completely remove the inlet and attach their own with screws.

If you can take yours, cut off the inlet and weld on a larger tube, your machine shop may be able to machine this smooth

my 2c

[Korben007]

so daz why would you go with a 2283 over a k24?

[Doug@FrankenTurbo]

so daz why would you go with a 2283 over a k24?

I'll take a shot at this one: the 7+7 blade count on a 2283 trim compressor wheel would result in a better slip factor than you'd see with a 6+6 24-series BorgWarner wheel. So it'd be more efficient. And lighter. But even with the "gripping" advantage of that 7+7 design, the 2283 is a very aggressive trim. It surges in the 2.0L displacement, so it's a bit risky fitting that wheel to half of 2.7L.

[Korben007]

I'm more concerned with the 4.2 fitment.

[airtite]

Mine:

2283 7 blade billet wheels in RS4 compressor housings with RS6 TFSI turbines and custom hot sides.

Running 14psi actuators.

ONE of these is capable of 350+hp on a pump gas 1.8t. My buddy Dan is doing them, and would be happy to do more if you ask nicely

Hey long time.... tried to send you an email but you didnt respond. I am looking at doing the 2283 conversion on my rs6 and my turbo guy was asking if I could get a part number of the compressor wheel any chance you can get that for me? 2nd do you have any damos//decent xdf/kp for the rs6 you would be willing to share with me?

[armageddon-]

2283 compressor wheel does not fit rs6 housing, theres not enough material, you will need a sleeve.

[erykv1]

Hey long time.... tried to send you an email but you didnt respond. I am looking at doing the 2283 conversion on my rs6 and my turbo guy was asking if I could get a part number of the compressor wheel any chance you can get that for me? 2nd do you have any damos//decent xdf/kp for the rs6 you would be willing to share with me?

you do realize daz has passed away right...

[airtite]

omg no I didnt.... I am so sorry I havent been around for a few years.

[airtite]

Hi I thought Daz had done this in an rs6 k04, what is the biggest compressor wheel you can fit in the stock turbos with just machining the housing?

[bruddha]

Revisiting. Looking into K04 upgrade options. Has anyone had experience or done more research on fitting either the 2283 or 2275 CHRA into K04 housing?

[Silverex]

Where are these 2283 wheels. I did a search awhile ago and could find any coming up

[bruddha]

Where are these 2283 wheels. I did a search awhile ago and could find any coming up

Only ones I've seen are on PB5 website. But cant remember if they are the 2275 or 2283 wheels.

[darren p.]

Subscribing for current info on RS6-KO4 wheel upgrade options.

2283 fit in the RS4 KO4 housing from what was said above but not the RS6 KO4. K16 compressor wheel is an option I think but this is all pretty new to me, so I'm here to learn. I understand OE BW RS6 turbos are not a popular option right now so hoping this thread can fill the knowledge void on this topic in the current era...at least for me anyway.

[bruddha]

Subscribing for current info on RS6-KO4 wheel upgrade options.

2283 fit in the RS4 KO4 housing from what was said above but not the RS6 KO4. K16 compressor wheel is an option I think but this is all pretty new to me, so I'm here to learn. I understand OE BW RS6 turbos are not a popular option right now so hoping this thread can fill the knowledge void on this topic in the current era...at least for me anyway.

I'm trying to figure out which CHRA will fit in RS4 K04 housing without needing to shave the insides...but also want to know who, if anyone, has attempted this already and what their experience has been.
Based on all the info I've gathered, the 2275 CHRA sizes are: Compressor - Inducer/Exducer: 42/56, Turbine - Inducer/Exducer: 50/44. The 2283 CHRA size: Compressor - Inducer/Exducer: 46.5/59.5, Turbine - 50/44.5. Seems like the 2275 would fit easier in the standard RS4 K04 housing than the 2283??

[Silverex]

The 2283 is only a compressor wheel not a whole CHRA no? That’s what I assumed.

[bruddha]

The 2283 is only a compressor wheel not a whole CHRA no? That’s what I assumed.

You may be correct, but TTE uses a "2283 CHRA" in the TTE320 for the 1.8T. I assume its the same spec

[Silverex]

U got a link? Cause I’m seeing them advertise it solely as a compressor wheel and this thread was made about CWs not CHRAs since most use different parts for their applications.

[bruddha]

Nope, you are correct. It only shows the compressor wheel, not full CHRA.

[Silverex]

Subscribing for current info on RS6-KO4 wheel upgrade options.

2283 fit in the RS4 KO4 housing from what was said above but not the RS6 KO4. K16 compressor wheel is an option I think but this is all pretty new to me, so I'm here to learn. I understand OE BW RS6 turbos are not a popular option right now so hoping this thread can fill the knowledge void on this topic in the current era...at least for me anyway.

Compressor housing insides are the same for rs4 and rs6 so they both can fit same size wheels.

K16 compressor is an option but a bad one since it’s such old tech.....now a k16 turbine wheel would be a great upgrade on an rs6

[bruddha]

Compressor housing insides are the same for rs4 and rs6 so they both can fit same size wheels.

K16 compressor is an option but a bad one since it’s such old tech.....now a k16 turbine wheel would be a great upgrade on an rs6

What about the hot sides? Would a 2275 or 2283 fit K04 hotside or does it require RS6? I'm sure some machining is needed in the K04 housings?

[Silverex]

Not sure if you’re getting confused or if you need to do some homework on turbo charger basics but those are compressor wheels which do not go in the turbine/exhaust housings.