A4 b7 k03 hybrid

[Joeldavidlutwyc]

Hi everyone looking at going down the k03 hybrid route looking at making around 300bhp+ I have the 2.0L TFSI with the engine code BGB 200bhp standard was just wondering what I'd need
-front mount intercooler
-custom exhaust
-pannel filter in standard Airbox
And information would be greatly appreciated :)

[canadianA4B7]

A hybrid k03 is literally a K04, so what’s needed for k04 you’ll need for hybrid k03. Now u likely can get away with some cheaper equipment rather then dishing out the “Audi tax”. But injectors, newest DV, intercooler, HPFP and a good hfc or test pipe are generally a MUST for this sort of stuff. I’m sure if I’ve missed something someone else will chime in.

[Charles.waite]

High flow cat, Downpipe (full exhaust isn't necessary), HPFP upgrade, Intercooler (not really necessary on a DD but not a bad idea if you don't like the idea of heatsoak sapping power when you get on it).

Thats about it. YOu might need more maintenance stuff like a new LPFP or LPFP controller if yours are weak and approaching end of life, but an upgrade in that area isn't really necessary.

[Jet08]

And let us not forget a tune specific for the new turbo, with the hybrid it is going to be hit or miss but a good off the shelf K04 will probably work.

[Joeldavidlutwyc]

Hi lads thanks for replying does anyone know what k04 goes on and is it literally bolt on? ? So on the parts list I have so far:

-front mount intercooler
-Audi r8 red coilpack
-HPFP internals
-audi s3 injectors
-3"downpipe
-Audi s3 DV
-Induction kit
-De-cat/hi flow cat

Anything else I've missed off?

Also if I'm having to use all of this for the k04 hybrid is it would me putting a k04 hybrid on would there be much difference in power?

[oVeRdOsE]

nice to have :

- 1.8t oil pump
- balancer shaft delete
- 1.8t oil filter housing.
- a complete hpfp for k04, not a internal upgrade

the dv can simply be the rev D oem , or a GFB DV+ on your stock dv coil.

[canadianA4B7]

Hi lads thanks for replying does anyone know what k04 goes on and is it literally bolt on? ? So on the parts list I have so far:

-front mount intercooler
-Audi r8 red coilpack
-HPFP internals
-audi s3 injectors
-3"downpipe
-Audi s3 DV
-Induction kit
-De-cat/hi flow cat

Anything else I've missed off?

Also if I'm having to use all of this for the k04 hybrid is it would me putting a k04 hybrid on would there be much difference in power?

K04 is usually on the S3 cars. What’s done to fit them to our platform is only taking the compressor housing off of a k03 and boring it out “hybrid k03”. The issues with k03 is the small hotside wheel. Sure you can bolt the Mazda k04 compressor onto the k03 turbine but you don’t get fuck all out of it due to the miniature k03 turbine. So who hybrid are you looking at and what are specs of the 2 wheels used?

[Joeldavidlutwyc]

Looking at going the k04 route now mate Midlands turbo have said I may aswell go with the k04 hybrid just starting to gather the parts needed

[Joeldavidlutwyc]

Does anyone know if the s3 HPFP is a bolt on replacement and is it better than the standard pump?

[EvolutionArmory]

Does anyone know if the s3 HPFP is a bolt on replacement and is it better than the standard pump?

No. Those cars use different cams to get more fuel out of the HPFP. You don't need to buy a whole new pump. Just buy an internal upgrade kit for your existing pump.

[Joeldavidlutwyc]

Is it the k04-064 that is used on the s3 does anyone know & thanks evolutionarmory

[EvolutionArmory]

Is it the k04-064 that is used on the s3 does anyone know & thanks evolutionarmory

Yes. K04-064 but the compressor housing is modified so it works with our intake system since our engines are mounted different. If you buy a K04 for a S3, it won't work.

Look at CTS Turbo's K04 for our A4's. It's modified already.

[Joeldavidlutwyc]

Are these based in the UK or abroad?

[EvolutionArmory]

Canada. There's bound to be European distribution though

[EvolutionArmory]

https://www.ctsturbo.com/dealer-locator/

[Charles.waite]

I've got a line on a cheap, used K04-064, but its original, not modified for Longitudinal engines. Curious since this topic is on my mind, but would it be smarter/easier to have a spare k03 housing (I have one right now) modified to accept a K04 wheel, or would it be better to just have the inlet pipe modified to mate up with the standard b7 inlet pipe. I would imagine a real K04 housing is likely more efficient, flow wise, than a bored out k03 housing, and thus possible have less restriction in top end. The only other mod I'd have to do is to install a DV relocation kit sine the k04 housing doesn't have a DV hole milled out.

Thoughts? Opinions?

[vvenom800tt]

I've got a line on a cheap, used K04-064, but its original, not modified for Longitudinal engines. Curious since this topic is on my mind, but would it be smarter/easier to have a spare k03 housing (I have one right now) modified to accept a K04 wheel, or would it be better to just have the inlet pipe modified to mate up with the standard b7 inlet pipe. I would imagine a real K04 housing is likely more efficient, flow wise, than a bored out k03 housing, and thus possible have less restriction in top end. The only other mod I'd have to do is to install a DV relocation kit sine the k04 housing doesn't have a DV hole milled out.

Thoughts? Opinions?

I've had g-pop shop quote me $750 to make my ko3 a hybrid Ko4.

They did great fixing my wastegate flap.

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[EvolutionArmory]

Cheap K04 equals dollars spent

Modding a K03 compressor housing to fit equals dollars spent or modding the K04 housing to work in a longitudinal motor does too. Plus, is the work going to be done right or backed up by the shop if there’s a problem?

DV relocation equals dollars spent

Do all of those totals equal less than a brand new CTS K04?

Will the CTS Turbo K04 just drop in with no headaches or unexpected issues? Probably. Will the hybrid you had made? Unknown.

That’s how you figure out if it’s worth it Charles. Sometimes it’s easier to just buy something from a reputable company with all the work done right and warrantied and sometimes it is if it’s easy enough or cheap enough. I think you’ll find that it isn’t easy enough and it will probably cost close to a new K04-064 depending on how you do it.

I’ve been toying with learning how to do a K04 upgrade on my K03 but I can run a mill and have access to CNC machines. Even still it will cost me some cash and might not be worth it.

[Joeldavidlutwyc]

I'm debating which route to go as the k04 turbo is £1700 from cts without import charges or I can get my k03 turned into a hybrid turbo for £500 from a local reputable company obviously I'd still have to change the other components any advice on what other people would do?

[canadianA4B7]

I’ve been toying with learning how to do a K04 upgrade on my K03 but I can run a mill and have access to CNC machines. Even still it will cost me some cash and might not be worth it.

Your easier to purchase new k04 hot side and core. Then pick whatever size k04 wheel you want and mill the compressor housing. I think there’s enough material for 3-5 different k04 compressor wheels that you can fit. There’s actually a Mazda that will work really easily using a few different parts. And to make it even better no turbo muffler, sadly you need to make a TIP pipe to adapt PCV and EVAP. You could if someone wants to purchase a different style compressor wheel (4/6/8 blade) that will give more up top but the restriction is the section on hotside where all 4 cylinders join. If you can open this up your K04 wud be a way way better turbo.

Been looking this over for about 2 years now have everything required without needing to mill anything.

[Charles.waite]

Theres a compatible mazda coldside that will allow a standard K04-064 compressor to work in a b7?

I'm not really interested in mixing and matching wheels and internals and whatnot, if I want anything exceeding a standard K04, I'm likely just going to go GTX or something. But a bolt on, longitudinal compatible compressor housing would be sweet.

[EvolutionArmory]

Your easier to purchase new k04 hot side and core. Then pick whatever size k04 wheel you want and mill the compressor housing. I think there’s enough material for 3-5 different k04 compressor wheels that you can fit. There’s actually a Mazda that will work really easily using a few different parts. And to make it even better no turbo muffler, sadly you need to make a TIP pipe to adapt PCV and EVAP. You could if someone wants to purchase a different style compressor wheel (4/6/8 blade) that will give more up top but the restriction is the section on hotside where all 4 cylinders join. If you can open this up your K04 wud be a way way better turbo.

Been looking this over for about 2 years now have everything required without needing to mill anything.

This is why I'm paying close attention to that LOBA LO400L build. It could be better than a K04 but in the same package.

[Charles.waite]

Buying a $2200 turbo kit is about 7x more expensive than what I’m possibly getting my k04 for. So yea, I’ve got room in the budget to spare.

[vce1232000]

Imo buy a CTS KO4-0064. Get supporting mods . Purchase a OTS KO4 tune. Enjoy the

[AudiKilla]

Buying a $2200 turbo kit is about 7x more expensive than what I’m possibly getting my k04 for. So yea, I’ve got room in the budget to spare.

Where did you find one that cheap?

[vce1232000]

Where did you find one that cheap?

Possible Golf R

[EvolutionArmory]

Buying a $2200 turbo kit is about 7x more expensive than what I’m possibly getting my k04 for. So yea, I’ve got room in the budget to spare.

Now go price out labor and materials from a good fabrication shop to make the compressor housing work and let me know what it comes to. Fab/machine work ain’t cheap. And you’d be crazy to not have it freshened up before you install it so factor in rebuild money as well. Then factor in the DV relocation kit and let me know if that 7 times number doesn’t shrink 😉

Things that sound too good to be true in your head usually are Charles. At least that’s how it goes for me anyway. Hopefully it will be different for you if you go through with it. Going K04 on the cheap would be awesome.

[Charles.waite]

Where did you find one that cheap?

I have friends. ;-)

[Charles.waite]

Now go price out labor and materials from a good fabrication shop to make the compressor housing work and let me know what it comes to. Fab/machine work ain’t cheap. And you’d be crazy to not have it freshened up before you install it so factor in rebuild money as well. Then factor in the DV relocation kit and let me know if that 7 times number doesn’t shrink

Things that sound too good to be true in your head usually are Charles. At least that’s how it goes for me anyway. Hopefully it will be different for you if you go through with it. Going K04 on the cheap would be awesome.

Oh that’s entirely possible, likely even that the costs to “make it work” might creep up towards a proper kit. I’m definitely going to call around though and see if anywhere near me has experience with this. Hell, CTS is just a few hours north of me...

[Jet08]

I pieced together a K04, I purchased a F23L from allforracing2 on ebay then replaced the average CHRA with a K04 spec one from turborebuild in the UK and the fit was spot on add the fueling and DP HFC add a K04 tune of your choice, for the turbo plus CHRA it would be around US$1,000 and the quality of the CHRA is equal to or better than BW.

[dalmation53]

I pieced together a K04, I purchased a F23L from allforracing2 on ebay then replaced the average CHRA with a K04 spec one from turborebuild in the UK and the fit was spot on add the fueling and DP HFC add a K04 tune of your choice, for the turbo plus CHRA it would be around US$1,000 and the quality of the CHRA is equal to or better than BW.

So you bought a shitty ebay turbo and replaced with better internals so its a cheaper method all around huh? Nice

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[canadianA4B7]

I pieced together a K04, I purchased a F23L from allforracing2 on ebay then replaced the average CHRA with a K04 spec one from turborebuild in the UK and the fit was spot on add the fueling and DP HFC add a K04 tune of your choice, for the turbo plus CHRA it would be around US$1,000 and the quality of the CHRA is equal to or better than BW.

Round of applause!!! Billet or cast aluminum compressor wheel? And did you swap the wastegate from a k03 or are you trusting the Franken?

[EvolutionArmory]

I pieced together a K04, I purchased a F23L from allforracing2 on ebay then replaced the average CHRA with a K04 spec one from turborebuild in the UK and the fit was spot on add the fueling and DP HFC add a K04 tune of your choice, for the turbo plus CHRA it would be around US$1,000 and the quality of the CHRA is equal to or better than BW.

What metrics are you using to make the blanket statement that the specs are equal or better than Borg Warner and how did you measure those metrics? 😉 Lots of companies claim to have better specs than a K04-064 but never actually prove it. JHM is an example of this. They claim their K04r flows more air than a K04-064 but when you ask them for a compressor map or ask them to show a dyno, their product development logs or any other info all you hear is crickets 🤣

I’m just curious as to what you measured to be able to say that your eBay turbo has better specs than BW. And my other question is, do those specs actually make your car faster?

[Jet08]

The UK company uses a billet wheel and micro balances, they produce a graph of vibration variance up to 150,000 rpm, I have used a subjective assessment on quality verses BW of the CHRA\ compressor wheel not the complete turbocharger. I uses the wastegate adjuster that came with the ebay turbo because the K03 has the waste gate connection at the top and the ebay had it at the bottom of the flap arm.