A6 2.0 and a4 2.0 turbos are diffrent

[Snoogie]

Looks like the impeller and housing are bigger and taller on the a6 turbo also the tall and short fins on impellers have different spacing. What are the chances the a6 turbo will make more power? Car is running Apr stg2 100oct map on meth. Left is a4 right is a6
IMG_0627.JPG


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[Snoogie]

IMG_0630.jpgIMG_0629.jpgIMG_0633.JPGIMG_0632.JPG


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[adamazing]

Well... that's an interesting find.

[McCloud199]

I say send it.


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[rally3]

Put it on and let us know what you think ?

[Nano909]

[muffinman92]

A6 turbos are about to be bought up with this find.

[bhvrdr]

It may be just the year differences in turbo production making small changes? What year are each from or what pn on them.

Mike

[A4x]

Are they both IHI? Like said above, please post details about the marking on them.

Also in the pictures it looks like one turbo is brand new and the other is used. Maybe this will cause some differences?

[ILVTRANCE]

please excuse my ignorance. What does this mean? Does that mean more power, or reliability?

[adamazing]

please excuse my ignorance. What does this mean? Does that mean more power, or reliability?

We don't know what, if any, differences in performance there are. We won't know until we can identify the specific turbo part number and compare flow charts.

[Nano909]

I thought they would use an S3 engine with a K04 for an A6. It would be really disappointing if they used a B8/.5 A4 engine and turbo.

[adamazing]

I thought they would use an S3 engine with a K04 for an A6. It would be really disappointing if they used a B8/.5 A4 engine and turbo.

The A6 comes in a Turbo 4 EA888, and Supercharged 6 (S4) variants. The S6 gets a de-tuned Twin Turbo V8 version of the RS7 engine.

That's all assuming we're talking about the equivalent model years, OP never said what year A6 that turbo was out of.

[Nano909]

The A6 comes in a Turbo 4 EA888, and Supercharged 6 (S4) variants. The S6 gets a de-tuned Twin Turbo V8 version of the RS7 engine.

That's all assuming we're talking about the equivalent model years, OP never said what year A6 that turbo was out of.

Yeah I know. I've only ever seen a C7 2.0 A6 once, and before that I didn't know that model/engine combo existed. Damn Audi for using a weaksauce engine on a car like that (and our B8's too).

I was looking up turbos for the 2.0 A6 and they're all interchangeable with our B8's. So pretty much they're not worth replacing, and not worth opening them up to interchange parts. We're better off with a K04.

[Snoogie]

Ok its on but its still adapting as i can hear wasegate cycling under full load boost. Its better but only because my old turbo had a small crack in the wast gate seat. The cold side housing is different and not interchangeable aswell. The a4 housing has a grove at where the impeller blades start the a6 housing does not and is larger. Also the sound is way different. This turbo doesn’t have that annoying ass flutter sound early on boost. It now sounds as a small turbo car should. I logged a bit today but im sure ill know more when i log in the morning.


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[Snoogie]

This is the a4 housing with flutter groove.IMG_0641.jpg


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[Spawne32]

found the part number, 06H145702R from a 2012, trying to dig up some more details

[Spawne32]

ECS listing the current revision as 06H145703S

[Snoogie]

If it helps i can get the vin for the a6. I bought the whole car.


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[Spawne32]

Couple sites are coming back saying this part number is a K04....interesting...

- - - Updated - - -

how many blades on the compressor side?

[Snoogie]

6 sorry, 12 6 big 6 little


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[Spawne32]

K04's i know are supposed to have a 12 blade compressor wheel vs the K03 which I believe has only 6 total blades, you may have stumbled across something amazing, if only i could verify those sizes

[Spawne32]

gotta measure these sizes

[bhvrdr]

K04's i know are supposed to have a 12 blade compressor wheel vs the K03 which I believe has only 6 total blades, you may have stumbled across something amazing, if only i could verify those sizes

Am i missing st or is there less than a mm difference in compressor dia he measured?

Mike

[Spawne32]

Am i missing st or is there less than a mm difference in compressor dia he measured?

Mike

Your right im seeing .7 or so of a mm, which I dont know is enough to warrant it being a different turbo or not or just wear and tear of the blades, or margin of error with the calipers. The compressor side has me curious but the part number search pulls back both borg warner and IHI turbos, possible its a switch in the manufacturer thats just causing this.

[Snoogie]

The housing had the same difference in bore size. The calipers are mititoyos. Also the wheel was almost 2mm taller but idk how that effects things. The exhaust side looked the same, i know on the ko4 looked obviously different.


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[bakedziti]

I have an APR K04 sitting in my kitchen, waiting for rebuild....can I help in any way?

[Snoogie]

Pics and measurements please.


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[Perry01]

Are they both IHI? Like said above, please post details about the marking on them.

/\ THIS /\

[Snoogie]

Yes both ihi, both physically identical untill unassembled.
Ill try for getting a pic of the pn

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[Perry01]

Yes both ihi, both physically identical untill unassembled.
Ill try for getting a pic of the pn

The small aluminum tab with numbers on it should shed some light.

[19birel]

I wonder if it's a K03S, back in the 1.8T days Audi used the K03 turbo on most models but put a K03S on the TT225 and original S3. Physically it looked about the same as a K03 but the inducer was K04 sized with the exducer being the same as a standard K03. If I recall correctly a 1.8T that would make ~200hp tuned on a K03 would push about 235hp with a K03S and 250 on a K04 so it was inbetween the K03&4 as one would expect.


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[Spawne32]

Possible, but the HP rating on the A6 with those model engines, at least for 2012 is still 211hp like ours.

[DetRebel]

Pics and measurements please.


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That’s what she said!

Sorry.

Subbed


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[Snoogie]

IMG_0655.jpg
I know its bad but...


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[19birel]

Possible, but the HP rating on the A6 with those model engines, at least for 2012 is still 211hp like ours.

The engines are usually underrated, they could've just listed it as the same 211 to eliminate confusion. They could also just have it running the same amount of boost but with the bigger inducer to make it more responsive? Just spitballing I could be off

[Snoogie]

Ok i have fairly close logs
1st is on a cooler day 2weeks back.
Max kg/h is 589
2nd log is warmer ambient temps
Max kg/h 627. This a6 turbo might be something.
IMG_0662.jpg
IMG_0661.jpg


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[Allthea]

please excuse my ignorance. What does this mean? Does that mean more power, or reliability?

Usually larger compressor wheel means slower spool but holds more up top.

Doesn't have any impact on reliability, really.

[Nano909]

How does it feel on the butt dyno?

[Snoogie]

Feels like power stays longer.


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