Alt.Hybrid Turbo Idea

[twoqu]

Guys,
Even more confused now. The AET K24-K26 appears to be all K26. However it has a smaller turbine exit (50mm) and a larger (in terms of height of comp blades) comp wheel than a K26 from a MB Urq. The shaft is the larger K26 one. So why AET have put K24 on their tag is a mystery. Suppose I'll have to ask them!
I am 100% sure of the MTM info. From the pic it definately looks like the 5071 housing as fitted to MB Urqs.
I do know of a supposed K24 upgrade. Steve H had his hands on it a while back. Did mean to get hold of it to measure the comp wheel.
Paul, the numbers on the comp housing, or indeed the turbine for that matter are meaningless if its a hybrid. To save money they usually machine existing housings. Somewhere there must be a definitive list of the comp wheel sizes/trim. Unlike Garrett, KKK seem reluctent to publish such info. Come on, who can get us that!
Interestingly the K24 turbine housing I have has a part no beginning with 5326. I think that adds weight to the theory of commonality.
Basically you are looking at a bigger comp wheel for the K24 right? Retaining the advantages of the smaller hot side. I fear that by the time all the mods are applied to a rebuild, the cost isn't going to be far off the RS2 option.

[S2central.net]

Yes I want the same old K24 hotside (turbine) and a larger coldside (compressor).

Fair point on housing numbers - they are useless if previously machined, but on the Nothelle turbo it might point to an alternate source of a turbo - maybe a K26 housing of Porsche heritage. And yes its a right PITA that KKK don't publicise the info. I'll be willing to bet that Garrett sell more products because they openly provide technical details that allow people like us to make informed decisions.

Even if we have to machine the original compressor housing to take a shiny new RS2 compressor wheel - along with a common bearing and shaft that can match up with the hot side - it must work out cheaper than the full blown RS2 route because the stock manifold is retained along with camshafts injectors and big end bearings for the 3B boys.

Paul

[Mihnea]

Paul, why don't you fit a 2.75"-3" exhaust from the turbo back, no cat along with an RS2 EM and an RS2 IC and stock K24 turbo? I've done a 100 S4 with this setup except for the IC and the damn car screamed with my standard boost values, I would say similar to a stock RS2 at the top end (290 to 300 HP) and much stronger than a stock RS2 in terms of low RPM torque. All these hybrid turbos turbos are ****e, BTDT, the only turbo that's worth the hassle is the RS2 (and its small brother with the small K26 hot side as used by MTM and Nothelle, if you're willing to sacrifice top end HP), and believe me, once you've driven it, you don't want anything else.

I've also recently tuned a full RS2 conversion on a 7A coupe quattro in the US on race gas (RON 107) and it frickin kicked ***, 320 HP at the wheels and 385ft/lbs of torque at the wheels too. Insane, that car pulls like mad, it's really sick.


Cheers,

Mihnea

[Jamo]

Might as well go the RS2 turbo route from the start because the exhaust cost so much! lol

Mihnea, do you know what the spec / model number the Turbos in the MTM / Nothelle are?

I was behind Eric's Nothelle and it left me for dead from on a stock K24 from rolling start.

[S2central.net]

@MIhnea - I know we talked about that ages ago - truth is I haven't had the money of the time to dyno each of these bolt on parts.

I need to get a new baseline run on the current chips on mine, possibly get them even leaner and closer to knock limit than the generic setup, then see what a decent exhaust can add, then the RS2 intercooler, then a cold-air filter (if any gain is visible on the rollers), and finally the 'evacusump' - all done with chipped stock K24. I wouldn't imagine the RS2 manifold will make any significant gain on the K24 - as I know it can allow 330bhp if an RS2 turbo is bolted on.

I'll probably go with a Sports CAT cos I like to be legal and green when I can - and I can't be arsed pulling a CAT off and on every year for the MOT - plus I don't know anyone who could bend the rules for me anyway.

Maybe the combination of RS2 intercooler and sports exhaust will give me the extra 20bhp I need to break the magical 300 barrier without sacrificing all that lovely torque from 2500rpm

I agree the ordinary K26 is a useless turbo for this after seeing the maps. The RS2 is definitely the right choice for 330-380bhp territory depending on what else is fitted.


Paul

[Josh-stateside]

I plan on sourcing a Rs2 chra. I was quoted $750 for one with a 6-8 week wait. In the begining I am thinking of putting on the k24 housings (machined to work if necessary) and having some fun with the either the chipped 280hp setup or the stock rs2 ecu. Later down the road if I get gready:


I can source a #6 or #8 hot side housing from a porsche 944 turbo. I am not sure about the cold side housing though, maybe a old audi k26 housing, or the 944 housing, maybe even bite the bullet and source a RS2 cold side housing, maybe go larger to 7200 "competition" size. Seemingly this is my plan and seemingly I will have a lot of options as long as the turbo companies are up to par with sourcing a rs2 chra.

Cheers
Josh

[williams]

Hi,
Has anybody experimented any further with the idea of a hybrid k24. I am looking for 320 - 340hp for my 3b and like the sound of the hybrid. My car has a home fry, RS2 IC, 3" turbo back with no cats and a Dahlback induction. It pulls really well now all the boost leaks are fixed(fingers crossed) but I am looking to leave these P1s and like standing instead of them nipping at my heals all the time. A hybrid would be a cheaper option otherwise could a RS2 turbo be fitted without any other upgrades?

Cheers

Alun.

[WabTheKing]

link

is this the same as an rs2 basicly or better or worse? i like the pokey bottom end of the k24

[Audi Parts Guru]

For everyones info, there are 24 different K24 compressors wheels currently in production with KKK, two of which are made of Titanium.

And for the K26 range, well there are currently 20 different compressor wheels in production in that range.

The K27 range has 60 yes 60 different compressor wheels in it's range

Oh the joys of Turbo charger science

[williams]

I have contacted the Turbo Centre Uk Ltd about the possibilities of a K24 hybrid capable of 330-340 hp. The company was recommended by a friend of mine has anyone had dealings with this company before? They will get back to me tommorow with the spec and price of the upgrade. I am looking for a cheap alternative for the RS2 turbo and would like to utilise my current k24.

Will keep you posted

Alun.

[Jonas_R]

Dont know if this helps, but Hohenester use a hybrid turbo and a RS manifold for there 310 hk kit. Got this kit on and everything else is stock besides turbo and manifold which are hybrids.

Should get it meassures sometime in end march / start april to see if the HP is true or false. Just bought the car with the kit.

/Jonas R.

[Bibby]

I use the MTM hybrid. Let me know if you want any numbers off it, I'll try and have a look.

It's far from $hite.

[williams]

Karlos,

what power does the MTM hybrid turbo give?

Alun.

[Bibby]

Alun... No idea at the moment as I haven't had it on a rolling road yet. It's been estimated between 315bhp & 330bhp, can't say on the torque figures. I have it on good authority that "it would show an RS2 a clean set of heels".

I'm in South Wales if you want to meet up some weekend, have a look for yourself.

[ericd]

From memory the Nothelle & MTM 'small hybrid' are the same beast (I'm sure Mihnea or others can clarify this point ), rough figures were 315 bhp @ 5800 rpm / 333 ib ft @ 2500 rpm.

Paul, I'll try and get the p/no's from mine , but last time I had it out it looked as if it'd been scrubbed of any numbers, I also know that it had a 270 degree crank , cause I changed to a 360.

HTH