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 What RS6 Hybrid Spec? View next topic
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Kent
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Joined: 22 Sep 2012
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PostPosted: Thu Dec 29, 2016 12:06 pm  Reply with quoteBack to top

Looking for anybodies experience of RS6 hybrids on RS4 motor and what sort of output should be expected. What sort of spec do your turbos have? Also whats the spec of the motor?

Im currently thinking:
Keep the RS6 shaft possibly with clip or larger opening
2283 / s3 tfsi compressor wheel
Larger inlet
Uprated actuator?
Might do some porting on it while its in pieces?

Going by Adams he saw approx 680hp and 580lbft. Abeit he had a decent spec motor with lower cr, cams and intake but on standard rods.

Jimbo i think youve once run some similar?

Any input would be appreciated.

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Mocke
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Car: RS4b5
Power: 820
Torque: 1000

Joined: 31 Aug 2013
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Location: Sweden

PostPosted: Thu Dec 29, 2016 7:41 pm Reply with quoteBack to top

Dont

That Wheel is used in TTE700 and are prone to surge if large inlets used. Boost needs to be kept lower resulting in lower output.
I have seen it in a couple of setups that was pushed harder.

Imho oem RS6 turbo or if you want hybrid TTE780 is the best choice.

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Kent
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PostPosted: Thu Dec 29, 2016 9:47 pm Reply with quoteBack to top

I think i want to keep boost lower anyway. Im keeping stock CR and keeping stock rods for now. At what point have you witnessed surge? Ive read it been an issue somewhere cant remember where.

Shall i build something more inline with 780 then and keep take it easy with the boost?

I dont want oem RS6 its not enough.

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Mocke
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PostPosted: Thu Dec 29, 2016 9:55 pm Reply with quoteBack to top

At initial spool.
3500-4500rpm.
I hade to onset and lower initial boost pretty much.
Resulting in a way laggier setup
Max power was no issue thou.
But you do not wanna loose spool and power under the curve if going this route.
Kind of looses the point.

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Kent
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PostPosted: Fri Dec 30, 2016 12:05 am Reply with quoteBack to top

Mocke wrote:
Dont

That Wheel is used in TTE700 and are prone to surge if large inlets used. Boost needs to be kept lower resulting in lower output.
I have seen it in a couple of setups that was pushed harder.

Imho oem RS6 turbo or if you want hybrid TTE780 is the best choice.


just as a side question... what is normal size inlets are used? would this increase the air speed and or pressure on inlet side of the wheel to help it keep spinning?

and then as another side question... what is it about the 780 that is so good when the engine can still only consume the same amount of air but the turbo will no doubt be flowing more.

Does this then point to increasing the size of the turbine bigger still so its a better balance?

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Kent
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PostPosted: Fri Dec 30, 2016 2:01 am Reply with quoteBack to top

or maybe as a compromise go for 2280 wheel?

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Mocke
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PostPosted: Fri Dec 30, 2016 6:37 pm Reply with quoteBack to top

Oem inlets are 2
Going this route you need at least 2.25 or 2.5inch.
Problem with turbos is a mismatch, too big compressor for the turbine.
It swallaws more than it can evacuate. Cosing turbine to choke itself.

780s has porsches k16 turbine which is good match.

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Kent
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PostPosted: Fri Dec 30, 2016 6:48 pm Reply with quoteBack to top

yeah i was planning on 63mm / 2.5 inlets.

i understand the theory of how surge comes about with stalling wheel speed. im trying understand what might be a better spec than what i posted.

would 2280 wheel be a better alternative being smaller in your opinion?

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Mocke
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PostPosted: Fri Dec 30, 2016 6:57 pm Reply with quoteBack to top

Kent wrote:
yeah i was planning on 63mm / 2.5 inlets.

i understand the theory of how surge comes about with stalling wheel speed. im trying understand what might be a better spec than what i posted.

would 2280 wheel be a better alternative being smaller in your opinion?



Yes.

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Kent
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PostPosted: Fri Dec 30, 2016 7:37 pm Reply with quoteBack to top

Thanks for the input!

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Kent
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PostPosted: Fri Dec 30, 2016 7:37 pm Reply with quoteBack to top

Who is running anything similar? Anybody?

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Shamx1166
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PostPosted: Sat Dec 31, 2016 2:14 am Reply with quoteBack to top

https://youtu.be/0jOYjLLhVD0

Seen this and a rs4 seems barely quick compared to a rs6 k26 spec turbo which may be US spec rs6 hybrid.

Well worth the money comparing to rs4 ko4 upgrade again each to Thier own.

Look forward to see the outcome of your build

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Mocke
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PostPosted: Sat Dec 31, 2016 10:16 am Reply with quoteBack to top

That is srm k24 turbo. China.
I delt with couple of those.
Not worth it or comparable to what OP is aimin for.

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muscledelivery
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PostPosted: Sat Dec 31, 2016 3:29 pm Reply with quoteBack to top

I just bought some oem rs6 turbos with the compressor housing cut and welded. I was under the impression these are more than enough for stock rods? Infact I'm kind of worried about it, and I don't have e85 just UK 99 and 50/50wmi . Surely a tte780 is way overkill for stock block? It makes sense for growing room sake i suppose.

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Kent
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PostPosted: Sat Dec 31, 2016 3:36 pm Reply with quoteBack to top

They are ace on an S4 and yes boost needs to be controlled when mapping. This is stock RS4 block for now they can take a bit more of a kicking. 780 spec of turbo would be pushing it too far on stock RS4 apparently. But again i suppose boost could be conservative while i find the funds to buy parts for forging.

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