One thing that needs to be answered with these small turbos is whether inlet manifold upgrades will yield anything.
Obv at 350+hp they're moving a fair amount of air, so the answer is probably.
Put tufftys mani on there while he paints something, please. No one has ever experimented with that on one of these yet
These manifolds are all about trying to get the gasses out fast and free flowing as thats the main restriction on these engines
BB has done a good job with his hybrids and now Bill has added to it but there will be a limit to what these can flow and adding a inlet it may only have a small gain
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Lupo still uses the stock inlet manilfold????
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Well this all looks very good,
So it looks like my new map will have to wait until i have this manifold and any other supporting mods,
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I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?
Actually, I raised the question before I understood the turbo's configuration. At first I'd thought it was a k16-series compressor teamed to a K04 turbine rotor. But now I understand it's the other way around.
Interesting design exercise, I have to say. What airflows are you running? Can you replace the EGT probe with a pressure sensor? It'd be instructive to see how the back-pressures are for a given airflow. As you know, we've seen pressures as high as 70psi in the "ChinaFold" when running exhaust from 280g/s airflow.
Granted, the back-pressures were partly owing to the unconventional 2.0L "FrankenStroker" design (which sucked), but it was enough impetus for us to re-think the turbine rotor for slightly increased flow.
Didn't you experience exhaust gas reversion at one point Doug? Due to the back pressures?
And had to upgrade valve springs accordingly.
what manifold was that on?
as an aside the exducer on the k16 turbine measures larger than the gtx2867 I have here.. lol
I will see what I can do re back pressure testing.. MrsB for now has it back so I am leaving it alone.. so she can actually drive her car again after many many months..
looks like 28 frame turbos are a pointless exercise
Well you probably know me well enough by now to reckon that I pooh-pooh a design that shifts power so far rightwards in the graph. But I'm glad to know you went with the smaller-exducer rotor variant. If I were to explore a K16-spec rotor, that's the one I'd choose as well. So now I'm surprised spool is so slow on the rotor you chose. Did you over-bore the turbine housing?
I have brought in the boost progressively, not pegged n75 100% to get it to spool asap.. I did'nt try that.. I might do on next opportunity to look see, but early onset would need to be lower boost to ride the surge line.. It spools on the road like a normal K04 hybrid, full chat spool at 3-3.5krpm..
boost onset on the 372bhp max run is below.. You will see from 3.5k I am holding it back to ride the edge of surge
Last edited by badger5; 7th January 2014 at 12:34.
Small exhaust turbines with increased back pressure tend to surge like a $%*@$ at high boost.
Hence the need to reign then in with the EBC (N75 in this case) at lower RPM.
Thats why the Eliminator series of turbos never really took off, the turbine was just too small to flow like a real GT28.
In theory turbo's run most efficient just under the surge line threshold so its a compromise.
I do love the spirit of trying new combinations. The TFSI hybrids shuld be interesting!
GT28RS, 350bhp level turbo......
This is performing no less, and is k04 based so if the car was a k04 to start with, much of it is reusable.. oil,water lines, downpipe, 80mm TIP......
The exhaust turbine on this is'nt smaller discharge diameter than a GTX2867 I have here.. I measured.
I wonder how the turbine size on my TFSI unit compared to the various GT28 options? I think Dan said he was using the K16 turbine in the TFSI hybrids too so I'd assume it's larger.
All very interesting stuff and it's great that the game is still being moved on.
At least now the K04 1.8T hybrid can realise the potential of its compressor wheel like its bigger 2.0T TFSI bigger brother. This is a big step up and great to see the whp going past 320bhp too. I know i'll be shot for even thinking it but is 400 bhp that ridiculous a possibility.
get 372bhp and he wants more - lol
I have'nt fitted all the planned hardware tho...
Its what 41mm standard so thats 1320mm squared.
LOBA offer to port their Ko4 manifold to 44mm making it 1520mm squared.
a 4 bolt GT28 gasket is 52,9 x 40.3mm which is over 2000mm squared.
I thought this was the bottleneck, since we can already bolt big compressor housings up.
Regardless of that, I'd definately rock one of the new hybrids. Saves a ton of custom fabrication work!
You have ASSUMED this is std size.. It is not
47mm Bore.. 1734^mm
This is just inlet to throat not A/R of course
Last edited by badger5; 8th January 2014 at 17:08.
Im very interested in this route. For someone who cant diy, to be able to keep things simple for the machanic keeps costs down. You can do the tune in stages rather than pay out loads in one go.and a 310bhp s3 must fly!! When i had my first s3 in 06 people said hybrids would be pointless.the k04 is to small and gets hot.heres what can be done when people push boundries. Awesome work!!
Bill, sorry if I missed it but is the turbo mounting with this manifold far off stock?
i.e. Will an existing ko4 down pipe mate up and a standard 80 mm Ko4 TIP or will it require custom bits.
Nice results Bill! Fantastic work with the R&D as always.
quick question, what would you say is an average Transmission loss for FWD car?
A brief fitment guide is available for this Manifold
downloadable pdf from here> http://www.badger-5.com/bin/k04-mani...nt%20Guide.pdf
350bhp & 316ftlb BBT new k16 7+7 blade hybrid turbo, Welly cooler, jetex filter, relentless ported v3 manifold 3" downpipe & de-cat, liquid gauge, r32 rear arb, AGU ported and polished Head, 550cc injectors, kw v2 Coilovers, s3dave tie bars & heat sheild, milltek cat back, I.E forged rods, brembos, inline fuel pump, v3 badger 5 tip, devils own WMI kit, AGU pistons, rear grooved discs & brembo pads, ds2500 pads & EBC ultimax disc, stack boost gauge
Only one way to find out.....
my personal thoughts are that without the added bore it's unlikely to make MORE power than a relentless, which are known to flow well.
the difference here is, this is well made, and will last the test of time. That's been the quest that until now has been impossible.