Anyone running the new design CTS K04?

[Bigbea]

I’ve been doing a lot of searching for my next upgrade. I’m look to see if anyone has run this redesigned CTS K04. The BW ones are hard to find. I’m probably going to by them during cts holiday sale next week.

Has anyone had success with it? How many miles? Any issues?

It’s either go this route or buy a used BT for a similar price from the classifieds

[EvolutionArmory]

Which of the 2 new CTS K04’s are you asking about?

There’s the CTS 1070 kit and the even newer hybrid X version.

I run the 1070 turbo and it works great. I hit 290 wheel HP with it a couple months ago.

[Bigbea]

I’m talking about the non BW turbo that’s originally 1499.00

[Bigbea]

I though you ran the BW version if I remember correctly. I been searching the hell out of K04s and your all over most of them

[Bigbea]

You think the hybrid version is worth $1999? I’d be going with a Unitronic K04 tune.

For that price though I could get that BT on the classifieds and get a GIAC tune @ awe

[EvolutionArmory]

I don’t have a BW. I have the 1070 kit.

I have no idea if their hybrid is any good. Most hybrids aren’t any better than a BW. I’d need to know exactly what they did to the X turbo and their details are vague.

Get a GIAC tune. You won’t be disappointed. I’ve compared most of the tunes to mine and nobody is flowing the air I’m flowing and boosting as solid as the GIAC tune unless they went custom dyno tune. GIAC is hands down the best off the shelf tune.


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[vce1232000]

hybrid turbo's made from manufactures that dont offer a specific tune for them is worthless imo . hardware & software work hand & hand to optimize both

[Bigbea]

That’s all I needed to hear. I gunna buy it next week. Thanks for the responses. Appreciate it fellas

[EvolutionArmory]

Just keep in mind that you might have clearance issues with the CTS manifold. It was literally 1/16th taller than stock.
Make sure you test wastegate cracking pressure BEFORE you install it. It’s easier to set it higher out of the car than in.

Make sure your N75 hoses aren’t bent and replace the N75 they supply with a new Pierburg or genuine Audi valve

All of these things are easier to do before you install it or try to.


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[AudiB720TS]

I’m a bit off topic here, but just want to chime in that authentic BW is very scarce now. Hybrid K04 vendors are charging a premium for non core exchange builds because of it (TTE). Venom Turbos made an advertisement they had two (2) BW to sell.

Mahle and other top tier brands are making K04’s also though.

If I were to do it today (still might) I’d buy a used S3 K04, modify the exhaust flange for longitudinal and then send it in for hybrid modification. Around 430-450 HP seems the new benchmark.

There’s always a custom tune.

[EvolutionArmory]

A K04 hybrid will probably never make over 400 CHP. The manifold and exhaust housing simply can’t flow it. It’s only a 40 lb/min turbo.

And I don’t trust European dyno tuner’s numbers. They’re an estimated number based off of wheel HP. Not nearly accurate.

And if you throw a bigger compressor and turbine wheel in it you’re still limited to the exhaust housing’s very small AR and manifold runners. At that point you are 100% better off running a larger turbo. Getting a 40 lb/min turbo to flow like a 50 lb/min turbo is just going to make hot air.


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[Kevin C]

Just keep in mind that you might have clearance issues with the CTS manifold. It was literally 1/16th taller than stock.
Make sure you test wastegate cracking pressure BEFORE you install it. It’s easier to set it higher out of the car than in.

Make sure your N75 hoses aren’t bent and replace the N75 they supply with a new Pierburg or genuine Audi valve

All of these things are easier to do before you install it or try to.


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It seemed to fit my 1.8T just fine.





20201220_222343.jpg

[EvolutionArmory]

Maybe they fixed the issue. I know of at least 1 other person who had the same issue as me on a 2.0T.


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[Kevin C]

Maybe they fixed the issue. I know of at least 1 other person who had the same issue as me on a 2.0T.


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I was being funny... Or at least trying to be funny since its bolted up to a 1.8T head. No clue if mine is fixed or not, it does fit the adaptor flange since there is not a lot to hit. Also, super happy how easy it was to fit a B7 K04 to a B6.

[EvolutionArmory]

Should be pretty cool on a 1.8T.

What are you gonna use for a DV? Do you just block off the turbo DV port? How does that all get plumbed in?

[Kevin C]

Should be pretty cool on a 1.8T.

What are you gonna use for a DV? Do you just block off the turbo DV port? How does that all get plumbed in?

I replaced the stock solenoid operated one with a BorgWarner vacuum actuated kit from an EFR turbo. This should be a lot neater than the buried mess that the 1.8T came with. Still working out the rest of the plumbing, so far nothing seems too bad. I just started mocking it up this week.



20201220_222501.jpg

[Kevin C]

If anyone is ever interested in sourcing one.

https://www.full-race.com/store/borg...n-valve-kit-2/

[EvolutionArmory]

It’s probably more trouble than it’s worth on a B7 since the OEM DV is suppose to be there.


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[megarex]

I’m a bit off topic here, but just want to chime in that authentic BW is very scarce now

doesn't APR's turbo kit use a Borg Warner K04-0064?

[vce1232000]

doesn't APR's turbo kit use a Borg Warner K04-0064?

they used to when they it.

[Bigbea]

looking for turbo...saw this from vast. Says it’s a genuine
BorgWarner k04 and $1250. Anyone had success with this one?

https://vastperformance.com/products...21459345014873

[canadianA4B7]

As genuine as you’ll need to fit transverse engine. Or you’ll spend another $150 having the turbo muffler cut off and a piece added to replace it going in the downward direction you’ll need.

[EvolutionArmory]

I love how they list a transverse turbo as being an upgrade for a longitudinal motor.

You’re better off getting the CTS BW spec K04 turbo we are talking about in this thread. That 1070 kit uses the correct size housings and the CHRA is made to BW specs. It’s as close as you’re gonna get to a BW turbo that actually justs drops in.


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[Jayz691]

I love how they list a transverse turbo as being an upgrade for a longitudinal motor.

You’re better off getting the CTS BW spec K04 turbo we are talking about in this thread. That 1070 kit uses the correct size housings and the CHRA is made to BW specs. It’s as close as you’re gonna get to a BW turbo that actually justs drops in.


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Prob price. The CTS is $2300..def the best option imo, but bit pricey.

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[EvolutionArmory]

Prob price. The CTS is $2300..def the best option imo, but bit pricey.

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The CTS 1070 has a BW spec CHRA. I didn’t say to buy their BW converted turbo for 2300. The 1070 kit has BW spec housings and CHRA for less.


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[Jayz691]

The CTS 1070 has a BW spec CHRA. I didn’t say to buy their BW converted turbo for 2300. The 1070 kit has BW spec housings and CHRA for less.


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Oh sorry, didn't know you were talking about a different one. Thats the one I see when I search..

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[EvolutionArmory]

The 1070 is based off of BW specs. I guess they figured since they couldn’t get any more they should just make a turbo just like it. Actually, it’s a little cooler because the actual BW turbo has a cast compressor wheel. The CTS “copy” has a forged wheel.

This turbo is pretty nice. It spools faster than my JHM turbo did, has higher peak MAF airflow than my JHM turbo did, and it does it with what some people would call an inferior design CHRA. No clipping, no multi blade wheel, just a basic K04 spec CHRA. But it performs better.

They hybrid K04 game is such horse shit 🤣

[MALMGRDC]

Is the 1070 the new CTS K04 X that I see on the website??

[canadianA4B7]

The 1070 is based off of BW specs. I guess they figured since they couldn’t get any more they should just make a turbo just like it. Actually, it’s a little cooler because the actual BW turbo has a cast compressor wheel. The CTS “copy” has a forged wheel.

This turbo is pretty nice. It spools faster than my JHM turbo did, has higher peak MAF airflow than my JHM turbo did, and it does it with what some people would call an inferior design CHRA. No clipping, no multi blade wheel, just a basic K04 spec CHRA. But it performs better.

They hybrid K04 game is such horse shit 🤣

The original k04 was only a 56.04 mm exducer on the compressor wheel. These all are now spec to 60mm so they aren’t per say a copy of the original. The 56 mm was mounted to a surface that allowed almost 62 mm which is why the 60 mm compressor wheel was developed. My original k04 from cts measured 56.01 mm on the exducer side of compressor wheel they all now are 60 mm and cast units remaining were reduced production in 2014 for all billet units as China produces billet for the same cost of cast. The hybrids are a complete crap shoot though likely can put down better power with alternative manifold. The other K04 turbo cars are using the exact same hotside wheel and S3 compressor they put down 403 g/s vs 290 g/s.

[EvolutionArmory]

Yes, the manifold and exhaust housing is a huge restriction and is the reason why hybrids only make more power on paper. In the real world the results are much different.

Having a kick ass wheel doesn’t help you if you’re just making more back pressure because the manifold and housing can’t flow it. Where the “hybrids” tend to shine is with spool and over boost control. Not in top end power. But having said that, this CTS turbo with its billet wheel spools stupid fast. With a 9psi crack pressure I’m hitting 20 PSI at 2600.

If we could use these K04 CHRA’s in a bigger AR housing there’d be a ton of 300+ WHP cars in here. The turbo itself is its own restriction which is why even hitting 300 wheel on 100 octane is a chore.

It’s even worse in the B7 VS other EA113 equipped cars due to fueling limits and MAP limits in the ECU. If we could run 3 bar map sensors and actually fuel these cars above 22.5 PSI more easily, we’d be having way more fun


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[canadianA4B7]

3 bar map is no problem just need to set scaling? I’ve never known this was an issue? Just installed has re scaled and no problem getting to 35 psi.


https://www.50ignite.com/blog/techni...e-is-sky-high/. This will help with the claimed fueling limitations. Bottle necks = friction. Audi goes from 8 mm od then shrinks further to 2.61 mm then most of you bore out 1 hole and expect 600 HP. Takes more then drilling out that 1 hole to get better fuel supply.

[EvolutionArmory]

Yes, the ECU can be scaled differently to make 22.5 PSI seem like it’s actually less but there aren’t many OTS tunes that offer it.

Before I set my MBC to cap boost to 22 psi I used to overboost from 2600 all the way to like 3500 and the boost curve was just a flat line because the map sensor couldn’t see the actual boost.
Attachment 213983

I drew in an idea of what actual boost was actually doing.

If I could run 22-23 PSI instead of 20 to where I make peak HP at 5800 RPM and still have fuel for it, my car would make a pretty good amount more power. Once I get my fuel pump in I’m going to try and do some dyno runs with just the MBC, no N75 (just plugged in) and see if I can get 22 PSI at 5800.

It would be nice if we could just throw in a 3 bar map sensor and have someone write a K04 tune for 22-23 PSI. Alas, our ECU makes it difficult.



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[KingKostas]

Yes, the ECU can be scaled differently to make 22.5 PSI seem like it’s actually less but there aren’t many OTS tunes that offer it.

Before I set my MBC to cap boost to 22 psi I used to overboost from 2600 all the way to like 3500 and the boost curve was just a flat line because the map sensor couldn’t see the actual boost.
Attachment 213983

I drew in an idea of what actual boost was actually doing.

If I could run 22-23 PSI instead of 20 to where I make peak HP at 5800 RPM and still have fuel for it, my car would make a pretty good amount more power. Once I get my fuel pump in I’m going to try and do some dyno runs with just the MBC, no N75 (just plugged in) and see if I can get 22 PSI at 5800.

It would be nice if we could just throw in a 3 bar map sensor and have someone write a K04 tune for 22-23 PSI. Alas, our ECU makes it difficult.



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u could throw in a 3 bar map sensor, i currently have one in

but like u said ots tunes cant be used with it

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[EvolutionArmory]

u could throw in a 3 bar map sensor, i currently have one in

but like u said ots tunes cant be used with it

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So like I said, I can’t use one. 😀

What I’m going to do is raise the MBC on the dyno and see where raising boost stops making power. As long as I don’t go too far over 22 psi I should still have a safe AFR. 2 more PSI should get me over 300 wheel. I just can’t go too far over requested boost or I might hit limp mode.

[KingKostas]

So like I said, I can’t use one.

What I’m going to do is raise the MBC on the dyno and see where raising boost stops making power. As long as I don’t go too far over 22 psi I should still have a safe AFR. 2 more PSI should get me over 300 wheel. I just can’t go too far over requested boost or I might hit limp mode.

no local custom tuners around u that could help out?


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[EvolutionArmory]

no local custom tuners around u that could help out?


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I don’t trust anyone to make a good tune.

What I’m planning on doing will most likely work so I’m not really worried about it.


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[oVeRdOsE]

Prob price. The CTS is $2300..def the best option imo, but bit pricey.

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also everything around : exhaust, injectors, intake, hfc, dv, hpfp, fmic, tune, etc. Then with all this money no way people should run the stock oil pump and balancer, add few 1000$ right there. Then , the clutch... Starting to be a bit pricey .

2 years ago I made a shopping list to myself, all diy, and I was around 10k$ cad in parts alone for 340bhp. And for around 7xxx$, a shop near my place can drop a tuned 3.0t 450bhp in my b7...

[vvenom800tt]

also everything around : exhaust, injectors, intake, hfc, dv, hpfp, fmic, tune, etc. Then with all this money no way people should run the stock oil pump and balancer, add few 1000$ right there. Then , the clutch... Starting to be a bit pricey .

2 years ago I made a shopping list to myself, all diy, and I was around 10k$ cad in parts alone for 340bhp. And for around 7xxx$, a shop near my place can drop a tuned 3.0t 450bhp in my b7...

I've contemplated a 3.0T swap, god that would sweet. Need deeper pockets and a garage first before i even consider it.

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[EvolutionArmory]

I've contemplated a 3.0T swap, god that would sweet. Need deeper pockets and a garage first before i even consider it.

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It’s probably not worth it. S cars are getting cheaper every year.


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[vdubjetta02]

I left the B7 world (7) years ago with an APR stage 2+ car..... but not sure how you current B7 guys are not just taking the $4-7k and putting it towards an actual sports car meant to handle the power.

Go buy a B8 S4 or and MKVI Golf R with an APR stage 1 tune, (Stage 2 for the golf R) and it will beat anything you try to do to your 2.0t B7........

My Downpiped Stage 2+ Golf R was beating my local friends with $15k motor build/turbo upgrades on their B7..... It's just not worth it. (Hence why I own a 450hp SQ5 and a 450hp Mercedes now) it doesn't take anything more than 2 mods to get there.