ko4/rs6 hybrids

[Layza]

What’s up guy’s, so I’ve been looking for a b5 s4 stage 3 for a few month’s and came across and very nice one. But the car has ko4/rs6 hybrids, so I’ve been searching and reading about this turbo and found a lot of info. I would like to know one thing, I read alot that the reliability on these turbo’s are no good "with out a good reason". I’m sure there is a few people running this turbo setup and I would like to hear about how many miles you have, how long have you had them installed and of course your thought’s on them.

Coming from a STi most aftermarket turbo’s being hybrid’s or true GT’s have very good reliability and is not uncommon to hear about setup’s going 30k plus when installed properly…

If I was to by a stage 3 I would not want the turbo’s to blow on me, if reliability is that big of a issues I willl build my own stage 3 setup… Oh and please don’t make this into a ko4 vs ko4/rs6, I don’t care about the power just reliability as the car already has the turbo’s installed…… Thanks

[A4 Meets 27t]

Check out how much boost its running daily, does it have a MBC, ya know those things count for running high boost, if its a conservative tune, it wouldn't be too alarming.

[Layza]

Here is his mod list, does not say anything about a MBC.

· EPL STAGE 3 (NO CELS)(within last 7k miles)
o K04/RS6 Hybrids (ported/polished and clearanced to 8/10ths)
o Complete EPL STAGE 3 (60lb injectors, RS4 accordion, 85mm MAF housing)
o Heat Tape-Wrapped RS4 Inlets Pipes
o “ER” Intercoolers
o RS4 Tranny and Motor Mount
· Vast Stage 2-Kevlar Hybrid w/ RS4 Pressure Plate 3k miles ago
· NEW OEM D/M Flywheel (3k miles ago)
· ASP 3” Down pipes with High-Flow Cats (200 cel) (15k miles ago)
· Milltec Super Dual Exhaust (15k miles ago)
· H-Sport Sway Bars (front and rear) (15k miles ago)
· ASP Drive train Stabilizer (15k miles ago)
· VAST Snub mount (15k miles ago)
· VAST Short Shifter (15k miles ago)
· Koni C/O’s (20k miles ago)
· AWE Boost gauge (15k miles ago)
· 710 DV (15k miles ago)
· Kevlar T/B Boot (7k mile ago)


Ether way, i would like to hear about ko4/rs6 user's and not so much about this car, as the mod's are very nice.

[Audi S4 Turbo]

Sounds like a solid car.. Not sure about your questions though. Too hard to tell..

[Layza]

Sounds like a solid car.. Not sure about your questions though. Too hard to tell..

Really, my bad.. I would like to hear from the guy's that have ko4/rs6 turbo's, like how long have they had them, how many mile's and there thought's on there setup...

[A4 Meets 27t]

Call EPL maybe they have some reliability experience with those turbos.

[ScottyT]

sounds like the casa that was for sale around here (or aw) last week, find the owners name and search it on the boards, see what he's gone through with it...

[Layza]

sounds like the casa that was for sale around here (or aw) last week, find the owners name and search it on the boards, see what he's gone through with it...

Your right, it was on AZ and AW.....

But i'm not trying to find info about this car, if it sell's it sell's.

This car just got me to want to learn more about the reliability of the ko4/rs6 turbo's.....

[Audi S4 Turbo]

Really, my bad.. I would like to hear from the guy's that have ko4/rs6 turbo's, like how long have they had them, how many mile's and there thought's on there setup...

Yea? I just wanted to comment on the car. I think that is a very good set up.

[NYCVR6]

Really, my bad.. I would like to hear from the guy's that have ko4/rs6 turbo's, like how long have they had them, how many mile's and there thought's on there setup...

I had them on my car for 5000+ miles and no problems.. They are on my friends allroad now. My car trapped 125 mph with them, at 3700+ lbs.. EPL tune, open dp's, and race gas...

[Layza]

Yea? Well I can comment on a car if I want regardless of what you're asking for. If I think it has a nice set up, I will say so.

Not sure about your questions though. Too hard to tell..

????? You said you didnt not understand my question. You can comment all you want

[Audi S4 Turbo]

????? You said you didnt not understand my question. You can comment all you want

Haha No, I understand your question. I just don't know the answer to your question. Meaning about the reliability. I think it should be the same as if it were straight up PJ ko4s.

[Layza]

I had them on my car for 5000+ miles and no problems.. They are on my friends allroad now. My car trapped 125 mph with them, at 3700+ lbs.. EPL tune, open dp's, and race gas...

Nice trap speed, what did you pull in the 1/4?? Did you like the turbo's when you had them, i see you have gt's now that must be fun....

[Layza]

Haha No, I understand your question. I just don't know the answer to your question. Meaning about the reliability. I think it should be the same as if it were straight up PJ ko4s.

LOL, i was confused for a min... Got it now..


I've read a few place's that the ko4/rs6 have a tendency to cause heat soak very quick.

Also is the hot side a ko4 and with the rs6 intake side? Would that cause’s it to pull more air than it can handle?? Witch would cause the turbo to over heat and cause the turbo’s to go bad faster….

Or am I way off???

[sti4now]

You have a PM!

[NYCVR6]

Nice trap speed, what did you pull in the 1/4?? Did you like the turbo's when you had them, i see you have gt's now that must be fun....

11.6
I liked them, i would say they are good for 20-30 more whp over a fully tweaked K04 car. I am in the process of building my car not with GT's.

[cjk]

Had mine on the car for 25k miles of homebrew (X chip and MBC)...never took the car to the track but had some pretty good FATs times on pump 92

So yeah- I guess you could say I liked them when I had them on the car. Now...motors being built and GT's will follow.

[AK1RA07]

I got some modified straight RS6's for sale in the classifieds if anyone wants them! :D If they don't sell soon I'll probably just keep them.

[lnferno]

Had mine on the car for 25k miles of homebrew (X chip and MBC)...never took the car to the track but had some pretty good FATs times on pump 92

What were your FATS times?

[cjk]

had one 2.9 in 50 degree weather...consistent 3 flat times though.

Best option outside of a OEM K04.

[elijahallen]

I've had them on my car for 30+K miles now spiking 26psi and lots of track time. It seems that the bad K04/RS6's blew in the first 5K miles, if they made it past that they hold up well because the balancing was done right. Thats a nice car your looking at btw ;-)

[Dr.Duct]

I think the biggest reason that you see that info is because of an older company called bauhn engineering. They built alot of shitty hybrids. The biggest thing is to find out who did the turbo's. Post back when you find out. If he got the turbo's from EPL then you have no worries imho. They are very quality and you never here bad tongue about them on the forums.

Secondly.. Like others have said, If your really worried about it, Just run lower amount of boost, but You should be ok running 19-21psi. GL..

Feel free to PM if you have any additional question's.

[Layza]

I've had them on my car for 30+K miles now spiking 26psi and lots of track time. It seems that the bad K04/RS6's blew in the first 5K miles, if they made it past that they hold up well because the balancing was done right. Thats a nice car your looking at btw ;-)

Nice thanks, he had that setup for 7k, so it seem like he past that 5k mark. I have many question to ask him buy i'm going to wait a week or so. As i'm in no rush, i just sold my STi and driving my POS for the rest of winter... Plus my buddy is going gt25's, so i mite just do a build my self, with rs6's or gt. I'm not sure yet. Just learning for now.....

I think the biggest reason that you see that info is because of an older company called bauhn engineering. They built alot of shitty hybrids. The biggest thing is to find out who did the turbo's. Post back when you find out. If he got the turbo's from EPL then you have no worries imho. They are very quality and you never here bad tongue about them on the forums.

Secondly.. Like others have said, If your really worried about it, Just run lower amount of boost, but You should be ok running 19-21psi. GL..

Feel free to PM if you have any additional question's.

Yea, I have a few question's for him like, who installed, who made the turbo's, who tuned the car and so on... I'll rememmber "bauhn engineering" But it's seem like b5 s4 are really coming down in price, so i need to decied on ether buying a cheaper stock s4 or spend 4-5k more on a car that has every thing done, that way i have money left over to build the motor. I have a few more month to decied.....

Low boost is no fun, LOL...

Thanks agian guy's, that's what I wanted to hear

[Layza]

had one 2.9 in 50 degree weather...consistent 3 flat times though.

Best option outside of a OEM K04.

WOW those are good number's on pump, my buddy get a 3.2 stg 3+ on race gas..

[elijahallen]

I think the biggest reason that you see that info is because of an older company called bauhn engineering. They built alot of shitty hybrids. The biggest thing is to find out who did the turbo's. Post back when you find out. If he got the turbo's from EPL then you have no worries imho. They are very quality and you never here bad tongue about them on the forums.

Secondly.. Like others have said, If your really worried about it, Just run lower amount of boost, but You should be ok running 19-21psi. GL..

Feel free to PM if you have any additional question's.

Mine are from buehn and are holding up great Forums are like media, only half of what you read/hear is true

Elijah

[johnkent1212]

Mine are from buehn and are holding up great Forums are like media, only half of what you read/hear is true

Elijah

Mine are as well, and no complaints. Even with some issues with my initial tune I was seeing spikes around 30 psi's, and still the turbos feel great and spool fantastically after my final tune.

[audiwop]

Mine are as well, and no complaints. Even with some issues with my initial tune I was seeing spikes around 30 psi's, and still the turbos feel great and spool fantastically after my final tune.

So you were spiking real high as well. I just installed a set of ko4/rs6 hybrids from VAST and im hitting 28psi. I'm going to do some logs and have them start tuning from their. Did you stay out of the gas untill the boost was brought down?

[cjk]

Thanks man- took A LONG time homebrewing on Xchip w/ 60lb injectors to get it to where it was...they were great turbos. I think I killed them though with my DUH FMIC cause when I pulled them at 25k miles, there was TONs of shaft play. Good luck with the decision!

WOW those are good number's on pump, my buddy get a 3.2 stg 3+ on race gas..

[Layza]

So you were spiking real high as well. I just installed a set of ko4/rs6 hybrids from VAST and im hitting 28psi. I'm going to do some logs and have them start tuning from their. Did you stay out of the gas untill the boost was brought down?

I would beat that he did, boost spike is not good. It can lead to engine/turbo damage, running to lean in the higher RPM's. Well that's how STi work, not sure if the s4's ECU correct's it.... I was shocked to learn that most use OTS maps for stg 3 setup's and that a pro tune is not needed.....

Thanks man- took A LONG time homebrewing on Xchip w/ 60lb injectors to get it to where it was...they were great turbos. I think I killed them though with my DUH FMIC cause when I pulled them at 25k miles, there was TONs of shaft play. Good luck with the decision!

So are you still running with that setup?? Any reason why you went FMIC instead of SMIC's??

Witch brings me to my next question? How do you kill turbo's with a FMIC?? The only reason I see, anyone going FMIC instead of SMIC’s is to avoid heat soak and to raise cooling efficiency.

[cjk]

There was too much pressure drop with the DUH FMIC- I couldn't tell because when you're hombrew on XChip, you run MBC only and TCD...so, you can't see how much duty cycle you have to run. The MBC is just making hte turbo's work regardless...so, I was probably pushing 27psi or more...but was seeing 25 tappering to 23 on my boost logs.

so- FMIC worked when I was homebrew...I think it was just the DUH that was the problem that caused the turbos to go "bye-bye"

Not running this set up anymore- motor is being built and then going GT's


So are you still running with that setup?? Any reason why you went FMIC instead of SMIC's??

Witch brings me to my next question? How do you kill turbo's with a FMIC?? The only reason I see, anyone going FMIC instead of SMIC’s is to avoid heat soak and to raise cooling efficiency.[/QUOTE]

[johnkent1212]

So you were spiking real high as well. I just installed a set of ko4/rs6 hybrids from VAST and im hitting 28psi. I'm going to do some logs and have them start tuning from their. Did you stay out of the gas untill the boost was brought down?

Call them immeiately. I had the same problem. I ended up getting my final tune from ASP due to locality.

[Dr.Duct]

Mine are from buehn and are holding up great Forums are like media, only half of what you read/hear is true

Elijah

you like 1 out of 50 of 500, lol jk. I agree, but they have a bigger fail rate of all the hybrid kkk series companies. I was just explaining to him why their was so much hype around hybrids failure.

[Dr.Duct]

Nice thanks, he had that setup for 7k, so it seem like he past that 5k mark. I have many question to ask him buy i'm going to wait a week or so. As i'm in no rush, i just sold my STi and driving my POS for the rest of winter... Plus my buddy is going gt25's, so i mite just do a build my self, with rs6's or gt. I'm not sure yet. Just learning for now.....



Yea, I have a few question's for him like, who installed, who made the turbo's, who tuned the car and so on... I'll rememmber "bauhn engineering" But it's seem like b5 s4 are really coming down in price, so i need to decied on ether buying a cheaper stock s4 or spend 4-5k more on a car that has every thing done, that way i have money left over to build the motor. I have a few more month to decied.....

Low boost is no fun, LOL...

Thanks agian guy's, that's what I wanted to hear

looks like it was EPL who tuned it, being how thats what it says in his vehicle description, and install really isnt to hard so if he says he installed it then you can just tell from his personality if you should run or not. lol. They are dropping in price but if this is an EPL car and was taken care of by EPL, I would jump all over it. your going to spend that 4-5k easily in the mods he has.

If this guy bought all of the mods for his car, Id say your ok. He has alot of the more expensive stuff on his car and looks like he went with quality over cost.. Id jump all over it, sound like a nice car. IF you know his user name on either here, or audiworld, then post it.. that could tell you alot as well.