500 BHP with a K26/7????

[Trankelstein]

I have the k26/27 #8 ex.housing on a wagner evo RS ex.manifold, and i have put in three gaskets to shim it out so to get around 3 mm clearance for the coldside housing.

The big problem is that the RS airbox doesn´t fit without cutting ()

[K Simmonds]

[QUOTE=adam g;911273]

When you fit the #8 got side it should push the cold side further from the manifold to give more clearance. You also have the option to fit an extra manifold gasket. I've done that before with no issues.

If you look closely mate that is with the #8 hot-side, I'd like to stick with that cold-side as it avoids purchasing more components and I think there's enough meat on it to up the inducer size considerably.

Good tip on the gaskets, hadn't thought of that, also now I'm thinking about it I guess you could also get a 3-5 mm spacer made and sandwich in-between the two. Though it would place more stress on the manifold and move the turbo closer to the air-box which is already quite tight. I have K26/7 on my RS2 which uses the same back plate as the hybrid above but a slightly smaller cold-side housing and it's virtually touching the air-box.

[John B]

Can I be bold and suggest you speak to Andy Taylor or John Marshall at AET Turbos with your requirements. They can give you compressor maps and a whole bunch of advice. Very friendly and highly recommended.

[K Simmonds]

Can I be bold and suggest you speak to Andy Taylor or John Marshall at AET Turbos with your requirements. They can give you compressor maps and a whole bunch of advice. Very friendly and highly recommended.

That's not bold at all John, sound advice. I've spoken to Andy before regarding the turbo AET rebuilt for me when I first got my S2 back on the road, their very helpful and friendly as you say.

I may well get them to machine out the cold side for me and balance the unit but I'm going to build this ****** myself.

[K Simmonds]

I have the k26/27 #8 ex.housing on a wagner evo RS ex.manifold, and i have put in three gaskets to shim it out so to get around 3 mm clearance for the coldside housing.

The big problem is that the airbox doesn´t fit without cutting ()

You must be running a larger cold-side housing than the one I've got, there seems to 101 different K26/7 combo's out there.

Do you know what the serial number is on your cold-side housing?

I will not be cutting my air-box, the cold-side I have will fit by the skin of it's teeth....just!

[K Simmonds]

Have found the dimensions for the impellers Quattronaut mentioned.

3071- 54.7mm/77mm. This will fit that housing IMO.
3371- 59.5 mm/83.8mm. Might just go, not that hopeful.
3375- 62.8mm/83.8mm. No chance.

I've found various after-market billet wheels varying in size between 53-60 mm inducers and 76-81 mm exducers some of which would definitely fit.

Same back plate on my RS2, as you can see it's tight to the air-box, but I reckon it'll go. Plus with my S2 I don't mind bending the mounting eye or leaving the bolt out and removing the rubbers from the inner wing so I'm sure I could find a bit more room.



Quickly chucked some other componats together for fun.

[Costash]

How did you manage to fit the maf hose on that cold side ,I made some mods to fit stock hose on my 26/27....

[K Simmonds]

How did you manage to fit the maf hose on that cold side ,I made some mods to fit stock hose on my 26/27....

I used an exhaust flaring tool and a hot air gun and carefully opened it up until it fitted.

[diesel des]

That 3375 is physically larger than a gt35 r compressors a t61 Garrett. Kkk may flow differently but on paper that's a 600 plus bhp compressor. What size are the turbines? An efr with v band could easily be made fit a k26 flange. Would be a simple flange adapter... Modern day kkk....

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[Quattronaut]

Ok, great you found the dimensions. The K26/27 naming is indeed crap- as if you say "I´m drivin a 5cylinder". It can be from 1,9 to 2,5L, NA or charged, 4 or 2 valves...

KKK names it´s turbos after turbine inducer. K26 "family" is 64,4mm. K24 is 59mm. BUT: every turbine is available in different "contours", or shapes (mostly there are 4). Exducer diameter is signifantly important for flowing capacity.
S2 turbine for example is "countour 3", which inducer/exducer ratio is 74%, giving 59mm/~43mm diameter. Good for spoolup, bad for high power numbers. RS2 turbine also is K24, but "contour 2", the biggest one, with 89,5%, making 59mm/53mm diameter. The commmonly used K26 wheels are "countour 1", with 87%, making 64,4mm/56mm. You see- K24 RS2 turbine exducer is nearly as big as the K26 one, but the wheel itself is much smaller and lighter (226g to 291g), giving it faster spoolup with nearly equal flowing capacity.

The K27 compressor wheels are the 3" ones, 76mm. And even there are several ones.
K.Simmonds, your 76mm/48mm wheel is the old 3064"G" wheel from the BMW 745Diesel, designed in the 70s and debutated in 1981. It can flow 0.27m³/s air, exactly the same amount of air as the 2672"G" wheel from the RS2 turbo can flow. It does not give you an advantage to the RS2 turbo, but is heavier and more laggy.

SamSam´s 3070 "G" is the same style wheel, but bigger, it can flow 0,315m³/s. Able to do 430-440hp, as he told.
Modern 3071 "O" style wheel: 0,355m³/s, able to do 470-480 hp.

I would not try the 3371 and 3375 wheels, I think your housing is too small, and your turbine, too.
I´d try the 3071 "O" one. I know a guy who´s driving that combi with 2,5bar@3300 rpm and around 450hp.

[Costash]

What do you use to hold the hose on the pressure side to keep the hose in place it was a challenge to keep it nice in tight but sooner or later is starting to pop out....

[Quattronaut]

That 3375 is physically larger than a gt35 r compressors a t61 Garrett. Kkk may flow differently but on paper that's a 600 plus bhp compressor. What size are the turbines? An efr with v band could easily be made fit a k26 flange. Would be a simple flange adapter... Modern day kkk....

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Properly speaking- yes, it is bigger, and yes, it can flow more. But only the compressor. Fitted to a K26 hotside, the turbine wheel and the "8" (or even the "10") housing will choke a little, so that the GT35 will outperform them in peak power, but giving the K26/3375X advantage in spoolup I expect. The 3375"X" wheel is in fact someting to fit to a K27.2 turbine with an "11" housing for biggest peak numbers.
Or at least to a K26 contour 2 (12,5mm tip) with a "10" housing

Why buy an EFR and make it fit our flanges, if you can buy an airwerks that directly fits? Very similar, nearly equal compressors.

[diesel des]

But no fancy half metallic half ceramic turbine wheel.

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[K Simmonds]

Ok, great you found the dimensions. The K26/27 naming is indeed crap- as if you say "I´m drivin a 5cylinder". It can be from 1,9 to 2,5L, NA or charged, 4 or 2 valves...

KKK names it´s turbos after turbine inducer. K26 "family" is 64,4mm. K24 is 59mm. BUT: every turbine is available in different "contours", or shapes (mostly there are 4). Exducer diameter is signifantly important for flowing capacity.
S2 turbine for example is "countour 3", which inducer/exducer ratio is 74%, giving 59mm/~43mm diameter. Good for spoolup, bad for high power numbers. RS2 turbine also is K24, but "contour 2", the biggest one, with 89,5%, making 59mm/53mm diameter. The commmonly used K26 wheels are "countour 1", with 87%, making 64,4mm/56mm. You see- K24 RS2 turbine exducer is nearly as big as the K26 one, but the wheel itself is much smaller and lighter (226g to 291g), giving it faster spoolup with nearly equal flowing capacity.

The K27 compressor wheels are the 3" ones, 76mm. And even there are several ones.
K.Simmonds, your 76mm/48mm wheel is the old 3064"G" wheel from the BMW 745, designed in the 70s and debutated in 1981. It can flow 0.27m³/s air, exactly the same amount of air as the 2672"G" wheel from the RS2 turbo can flow. It does not give you an advantage to the RS2 turbo, but is heavier and more laggy.

SamSam´s 3071 "G" is the same style wheel, but bigger, it can flow 0,315m³/s. Able to do 430-440hp, as he told.
Modern 3071 "O" style wheel: 0,355m³/s, able to do 470-480 hp.

I would not try the 337 and 3375 wheels, I think your housing is too small, and your turbine, too.
I´d try the 3071 "O" one. I know a guy who´s driving that combi with 2,5bar@3300 rpm and around 450hp.

Great info! Thanks for taking the time to write it up.

Right then it sounds like the "3071 O" is what I need to go for, 2.5 Bar @ 3300 RPM sounds awesome! Is that using 98 Ron fuel on a stock 2.2 or has he up capacity or used different cams?

So far I've spent very little on the two turbos I purchased to make that hybrid with an #8 hot-side, I can probably recoup most of it on the remains of the Porsche K26 and the various oil and water pipes that came with it. Effectively making it free before machine work, balancing, the 3071 wheel and a rebuild kit which will add up but won't be as much as yet another turbo.

[K Simmonds]

What do you use to hold the hose on the pressure side to keep the hose in place it was a challenge to keep it nice in tight but sooner or later is starting to pop out....

I used a mechanical flaring tool that expands as you wind a tapered bolt into a section of wedges, sorry kinda hard to describe properly.

It was easy, took about five minutes. I used that hose as an experiment as it's a bit tatty so it didn't matter if I ball's it up but as it happened it worked just fine, main thing is to get the rubber just hot enough to stretch but not melt.