B8 Ko4 owners follow up thread

[Coldcarnival]

You have my attention , good work

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[Spawne32]

I think the mambatek CHRA from the S3 is the correct one for this housing, trying to get some finer measurements. Mamba is listing the one I purchased to replace this ebay center housing as "7+7 2618 performance billet wheel, Inducer OD: 46.39mm, Exducer OD: 56.08mm (Extended tip OD: 59.66 mm) Nose: 10.97mm" I think I am measuring right inbetween the actual exducer and the extended tip on that wheel which is giving me funky measurements. Gonna try to pin this down better.

[Spawne32]

Exducer looks to be somewhere around 57.6mm and tip to tip on the blades seems to be about 60.9mm.

[Spawne32]

Inducer is measuring almost identical to mamba specs.. mamba listing Inducer OD : 46.39 mm, and since this is the part that actually goes into the bore of the compressor housing, seems it should work.

[Spawne32]

balancing sheet included with it

[Spawne32]

So mambatek thus far has ignored my emails and messages I have sent over facebook, even though they read them, regarding the order status and the lack of confirmation despite them billing my credit card the day of. Not sure how thats going to go thus far, I may wind up having to file a charge back for both the CHRA and the wastegate. I decided in the meantime to order a OE replacement K04 CHRA from TRL (Turbo Rebuild Limited) over in the UK. They sell melett aftermarket VSR balanced OE replacement CHRA's. £164.50 (euros) shipped to the US, roughly 221 bucks I think. https://www.turborebuild.co.uk/websh...049700191.html

This OE replacement CHRA should be exactly what I pulled from the ebay turbo mm for mm unless there is a discrepancy in the ebay turbos wheel design. If I use this CHRA, total price of the build for a legit K04 internal turbo comes to roughly 875 or so minus the upgraded adjustable wastegate and using the one it came with. Also totally up in the air should I get both CHRA's to choose from, which set of wheels I want to use, the 7+7/9 blade mamba, which is supposed to have huge flow potential, or the OE K04 sized wheels which are 6+6 and 12 blade on the turbine.

[Spawne32]

Few more updates, got a hold of mambatek tonight. Apparently their CHRA's are built to order and their production line is backed up at least a month right now, so they gave me the option to cancel that order, which I am going to do. Going to go with the OE replacement CHRA for the K04-0064 which is the S3 (8P) turbo which I believe is what you all are considering "true" K04's. Should have that CHRA in about 10 days, soon as it comes in ill get it all built with some new grade 10.9 hardware I ordered from mcmaster carr, along with an improved vibration resistant locknut for the vband it came with because I didn't trust the one it had.

Zinc Yellow-Chromate Plated Steel Hex Head Screw, High-Strength, M6 x 1 mm Thread, 16 mm Long, packs of 50 90854A132
Stainless Steel Flex-Top Locknut for Heavy Vibration, M6 x 1 mm Thread, packs of 1 94560A060
Bumax 88 Stainless Steel Oversized Washer for M6 Screw Size, 6.4 mm ID, 18 mm OD, packs of 5 94316A510

[A4 Centaur]

Excellent work! Looking forward to your progress.

[DetRebel]

Any gently used K04s available for around $800? Figured I’d try my luck


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[Spawne32]

Any gently used K04s available for around $800? Figured I’d try my luck


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You could find a used K04 from a S3, problem is the compressor housing still wont work for our application without some sort of modification.

[Spawne32]

Mambatek adjustable wastegate is here! Very high quality, unsure how I am going to set this as of yet.

[Spawne32]

Come's pre installed with the 12psi spring, looks like it comes with the 7psi, 15psi, 18psi, 22psi and 26psi springs. They recommend 3-4mm of preload on the rod tension when installing.

[AllroadCorbin]

Hi all- somewhat related but also a bit off topic. I’ve been trying out various oils in my Allroad and S4. gotten very nerdy with data and UOA reports from blackstone haha. I’ve run 8100 xcess 5-40 in my Allroad it’s entire life and it’s been. Cams looked amazing at 110k when I took a look. Also no consumption ever. Tried Redline 5-40 and honestly it is just too damn thick at operating temp. Car felt bogged down and i lost a few mpg. Tossed some 300v 5w-40 in, and holy hell. Gained back the mpg and the car feels rev happy as hell. My oil temps also decreased over 10f at 90mph. I kept thinking it was all in my head but I kept noticing how eager it felt. The double Esther race oil shizzz seems to be no joke. It’s also 0% shear to 392f which is higher than our motors will every produce. You can order it on FCP and have lifetime replacement. It’s $35 per 2L can (very expensive) but FCP replaces it free when you send the old stuff back lol. Thought I’d share. I’m a true believer in many things being snake oil but it feels like Motul 300v is not one of them. I’ll post a UOA after like 4-5k Miles. Seems like a good fit for a toasty K04 motor that gets “driven”


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[bhvrdr]

Hi all- somewhat related but also a bit off topic. I’ve been trying out various oils in my Allroad and S4. gotten very nerdy with data and UOA reports from blackstone haha. I’ve run 8100 xcess 5-40 in my Allroad it’s entire life and it’s been. Cams looked amazing at 110k when I took a look. Also no consumption ever. Tried Redline 5-40 and honestly it is just too damn thick at operating temp. Car felt bogged down and i lost a few mpg. Tossed some 300v 5w-40 in, and holy hell. Gained back the mpg and the car feels rev happy as hell. My oil temps also decreased over 10f at 90mph. I kept thinking it was all in my head but I kept noticing how eager it felt. The double Esther race oil shizzz seems to be no joke. It’s also 0% shear to 392f which is higher than our motors will every produce. You can order it on FCP and have lifetime replacement. It’s $35 per 2L can (very expensive) but FCP replaces it free when you send the old stuff back lol. Thought I’d share. I’m a true believer in many things being snake oil but it feels like Motul 300v is not one of them. I’ll post a UOA after like 4-5k Miles. Seems like a good fit for a toasty K04 motor that gets “driven”


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Keep in mind that stuff is going to have very little ad pack so its meant to be run at race intervals. Youre going to probably want to get it changed at least every 3k miles. Youd usually want a strret oil with detergents if running it on the strret.

Mike

[AllroadCorbin]

Keep in mind that stuff is going to have very little ad pack so its meant to be run at race intervals. Youre going to probably want to get it changed at least every 3k miles. Youd usually want a strret oil with detergents if running it on the strret.

Mike

The additive pack is actually very dense (as far as anti wear additives like moly and zddp). It does have some detergents but not as many as something like Amsoil DEO or another oil meant to go 15k. As long as you aren’t running it in a diesel motor or have a fuel dilution problem, it should not be an issue. The additive pack in 300v is very good for wear but could shorten the life of anybody with cats still (no issue here). there’s a lot of UOAs for people running it well beyond 5k and the reports are stellar. tbn retention is excellent. I think some crazy dude ran it for 14k miles on some forum and it came out better than his M1 0w-40 did. I’ll be doing 3-5k swaps like I always have.... especially now that FCP swaps it free

Anyways back to K04s! Just sharing! Carry on


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[bhvrdr]

The additive pack is actually very dense (as far as anti wear additives like moly and zddp). It does have some detergents but not as many as something like Amsoil DEO or another oil meant to go 15k. As long as you aren’t running it in a diesel motor or have a fuel dilution problem, it should not be an issue. The additive pack in 300v is very good for wear but could shorten the life of anybody with cats still (no issue here). there’s a lot of UOAs for people running it well beyond 5k and the reports are stellar. tbn retention is excellent. I think some crazy dude ran it for 14k miles on some forum and it came out better than his M1 0w-40 did. I’ll be doing 3-5k swaps like I always have.... especially now that FCP swaps it free

Anyways back to K04s! Just sharing! Carry on


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Ok good to hear. I know their rbf600 can run long fluid intervals just like regular brake fluid according to motul themselves but i thought i remembered them cautioning us in the b6 days against using 300v for street cars. I guess its not the case. Good deal.

Mike

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[AllroadCorbin]

Ok good to hear. I know their rbf600 can run long fluid intervals just like regular brake fluid according to motul themselves but i thought i remembered them cautioning us in the b6 days against using 300v for street cars. I guess its not the case. Good deal.

Mike

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People will advise against using any non API Sn oil for street use for a variety of reasons... usually catalytic converters / emissions protection. If my UOA comes out iffy or something odd then I’ll be sure to post it. Motul 300v is also Esther so the high polarity makes it stick to shit haha. Kinda neat the engineering that goes into something “simple” like oil. If people are dead set on long intervals then Amsoil 0w-40 signature or Motul 8100 xcess is your best move from the countless hours of pointless research I’ve been doing lol.


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[Spawne32]

got the new K04 core in from the UK today, and let me tell you, its like a night and day difference between the ebay core and this melett core. Thing spins almost as freely as a ball bearing turbo. Comes complete VSR balanced as well. Gonna try to fit it in the ebay turbo housings and see how it does. If it matches up right I think this will work out well.

[bhvrdr]

People will advise against using any non API Sn oil for street use for a variety of reasons... usually catalytic converters / emissions protection. If my UOA comes out iffy or something odd then I’ll be sure to post it. Motul 300v is also Esther so the high polarity makes it stick to shit haha. Kinda neat the engineering that goes into something “simple” like oil. If people are dead set on long intervals then Amsoil 0w-40 signature or Motul 8100 xcess is your best move from the countless hours of pointless research I’ve been doing lol.


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Yeah ive ended up song m1 now. Used redline in the past but it runs a bit thick. Probably should have dropped down to 0w30. Now i just get the $22 jugs of m1 and swap it every 4 to 5k on the non lap day cars. Heard nothing but good things about 300v from lap day guys. The Porsche guys are all using m1 0w50. Its actually a ll spec oil that Porsche recommends for track days

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[Spawne32]

Guess what fella's...perfect fit. Exactly the same dimensions as the ebay wheels on the OE K04 CHRA from the S3. Fits perfectly into both housings. This is essentially an unclipped K04-R that JHM offers for a couple hundred dollars less.

[AllroadCorbin]

Yeah ive ended up song m1 now. Used redline in the past but it runs a bit thick. Probably should have dropped down to 0w30. Now i just get the $22 jugs of m1 and swap it every 4 to 5k on the non lap day cars. Heard nothing but good things about 300v from lap day guys. The Porsche guys are all using m1 0w50. Its actually a ll spec oil that Porsche recommends for track days

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Yea that’s totally fine. I’d probably be fine running M1 0-40 in the Allroad if I did 3k intervals but I drive really hard sometimes and the stated 10k interval for that oil wouldn’t work out for me. It would probably retain its TBN just fine but heating it in the 250-260 Range (at the sensor) a couple times is enough to shear it to a 30w from some of the UOAs apparently. It’s supposedly why BMW LL-01 or whatever the newest one is doesn’t have M1 0-40 on its list. Those 335s and 340s run hot as hell in normal driving.... but for how incredibly cheap M1 0-40 is, there’s no reason to not keep it really fresh anyways.

The more you dig into VW 502 and Porsche A40, and bmw LL-01 certifications the more you find out it’s less of a performance spec and way more of a business arrangement. Not surprising I guess.


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[AllroadCorbin]

Guess what fella's...perfect fit. Exactly the same dimensions as the ebay wheels on the OE K04 CHRA from the S3. Fits perfectly into both housings. This is essentially an unclipped K04-R that JHM offers for a couple hundred dollars less.

Dang that’s cool


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[awdconnor]

Hey guys. Does anyone here have a DV+?

I had a feeling my Stock DV was going out (REV D) and I had a DV+ just sitting around from my k03 days.

I installed it and ran a log. Boost held just fine.

The thing I'm trying to figure out is the "Blow Off" sounds from the intake. Its more so like a high pitched "JDM" sound when I get off the throttle.

Does anyone have a video of what their car sounds like with a ko4 and the dv+?

[muffinman92]

Hey guys. Does anyone here have a DV+?

I had a feeling my Stock DV was going out (REV D) and I had a DV+ just sitting around from my k03 days.

I installed it and ran a log. Boost held just fine.

The thing I'm trying to figure out is the "Blow Off" sounds from the intake. Its more so like a high pitched "JDM" sound when I get off the throttle.

Does anyone have a video of what their car sounds like with a ko4 and the dv+?

Yeah mine got a lot louder of a blow off sound after the DV+. My car has a whirling wind sound at like all times from the DV+, K04, Intercooler, and Piping

[Spawne32]

Hey guys. Does anyone here have a DV+?

I had a feeling my Stock DV was going out (REV D) and I had a DV+ just sitting around from my k03 days.

I installed it and ran a log. Boost held just fine.

The thing I'm trying to figure out is the "Blow Off" sounds from the intake. Its more so like a high pitched "JDM" sound when I get off the throttle.

Does anyone have a video of what their car sounds like with a ko4 and the dv+?

I had alot of issues with mine. When it would get hot from the engine heat, the piston would bind in the bore. Wound up just going with a vent to atmosphere spacer which worked alot better.

[muffinman92]

I had alot of issues with mine. When it would get hot from the engine heat, the piston would bind in the bore. Wound up just going with a vent to atmosphere spacer which worked alot better.

What were the symptoms?

[Spawne32]

What were the symptoms?

shudder when you let off the gas, wouldnt release boost quickly

[A4 Centaur]

^ Same here. Threw my away a few years ago as it seemed to fail after a year or so.

[Nano909]

Yeah mine got a lot louder of a blow off sound after the DV+. My car has a whirling wind sound at like all times from the DV+, K04, Intercooler, and Piping

I thought the turbo spool sound while driving went away with a k04?

[Spawne32]

I thought the turbo spool sound while driving went away with a k04?

The birds nest sound will go away, that sound comes from the way the compressor is designed. As far as the turbo sounds, the K04 still gives them, as will any turbo producing high boost.

[Nano909]

The birds nest sound will go away, that sound comes from the way the compressor is designed. As far as the turbo sounds, the K04 still gives them, as will any turbo producing high boost.

Under WOT I understand, I meant the turbo sound that lingers around any time you barely step on the gas.

[Spawne32]

Under WOT I understand, I meant the turbo sound that lingers around any time you barely step on the gas.

Compressor design, mainly the wheel. I believe the K03 has a 12 blade full fin design where as the K04 is a 6+6 staggered setup.

[Nano909]

Compressor design, mainly the wheel. I believe the K03 has a 12 blade full fin design where as the K04 is a 6+6 staggered setup.

I'm just waiting for this so I can start messing around.

[Spawne32]

if that ever comes to fruition and doesnt cost an arm and a leg lol

[rolandoa1324]

I'm just waiting for this so I can start messing around.

Who’s making that?


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[gtg196w]

Does anyone have issues with starting? Randomly, the starter will be super weak and on rare occasions, I need to try starting like 3-4 times before the car will start. I have a CTS k04 kit with APR tune, APR intake... I know I need to scan, but haven't yet. Just wondering if anyone has experienced the same thing. Seems to only happen in cold weather.

[Spawne32]

Does anyone have issues with starting? Randomly, the starter will be super weak and on rare occasions, I need to try starting like 3-4 times before the car will start. I have a CTS k04 kit with APR tune, APR intake... I know I need to scan, but haven't yet. Just wondering if anyone has experienced the same thing. Seems to only happen in cold weather.

Turbo wouldnt effect starting, either a weak starter motor or a weak battery would.

[JLAllroad]

Does anyone have issues with starting? Randomly, the starter will be super weak and on rare occasions, I need to try starting like 3-4 times before the car will start. I have a CTS k04 kit with APR tune, APR intake... I know I need to scan, but haven't yet. Just wondering if anyone has experienced the same thing. Seems to only happen in cold weather.

Check plugs...many of us are using colder plugs that can get fouled in winter. Additionally, E85 can cause hard cold starts, that is why a 5th injector was added.


Jeff

[AllroadCorbin]

Check plugs...many of us are using colder plugs that can get fouled in winter. Additionally, E85 can cause hard cold starts, that is why a 5th injector was added.


Jeff

The 5th injector was added to support the additional fuel volume required by ethanol’s stoichiometry.

FWIW I cold started my B8.5 two winters ago at -14 degrees with a full tank of E and it was fine


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[old guy]

The only time the 5th injector is used is during a cold start when running ethanol. Other than that it doesn't do anything else.