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Old 02-02-2011, 07:25 PM   #1
Tommy_J OP
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950 Supermoto Turbo Build Thread

Hey All. I decided to go nuts and turbo my 950 Supermoto. Some folks, even as far away as France, have asked for info on the build so here we go. This is the virgin prior to defiling.
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Old 02-02-2011, 08:09 PM   #2
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Step one : Decide on objectives

I have in mind a low boost installation. Say under 6 psi. A couple of things are really important to me. One is that boost start early and enhance the already excellent midrange. Peak power does not need to be huge but if the turbo machinery can be sized for 150 hp with good midrange so much the better.

The bike should be quiet. This is important to me as I like to travel with the front tire Ĺ inch off the ground whenever possible and being quiet make it possible more. Turbos make nice mufflers but additional muffling will be needed for the level of stealth Iím after.

To make things interesting Iím shooting for a net weight reduction and significantly improved off road ability
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Old 02-02-2011, 08:37 PM   #3
andyhol
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standard 950 supermoto not enough?
increase off-road ability and add a turbo?

too awesome and really fucking crazy, good luck
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Old 02-02-2011, 09:33 PM   #4
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Step Two : Select Turbo

Looks like a clone of a Borg Warner K03 will do fine. This trim should be good for 180 HP at a pressure ratio of 1.63, or 9.26 psi boost. Not that I’ll ever run it that hard. Peak boost is achieved at 4200 RPM.

There’s a lot of talk about how great ball bearing turbos are but I have no desire to spend $700. Final decision was for a Chinese journal bearing turbocharger. K03 turbos are used on untold thousands of VW Golfs and Beetles and there are a lot of these Chinese clones running around as replacements. I goggled around to see if anyone had bad experiences with them and came up empty. Sure, the quality is more spotty than the real thing but this sucker only cost $190. If it goes bad I’ll replace it for less than a change of tires.

Here's the efficiency map
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Tommy_J screwed with this post 02-03-2011 at 05:18 PM
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Old 02-02-2011, 11:16 PM   #5
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Old 02-02-2011, 11:23 PM   #6
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Holy crap.
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Old 02-03-2011, 05:28 PM   #7
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Step Three : Mounting Arrangement

The usual approach is to put the turbo in front of the motor, down low. A novel thing I want to try is to package the turbo where the right muffler was. This gives cleaner routing for the exhaust. Its all flowing backward. The air cleaner position makes more sense up high. Oil can probably drain from the turbo by gravity without need for an expensive and fragile scavenge pump.
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Old 02-03-2011, 05:39 PM   #8
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I wish I could post more than one pic at a time.

Hereís another view with a temporary bracket and bailing wire holding the turbo. Iím trying to get it positioned in tight and keep the turbo within 18 degrees of level. Thatís so oil wonít leak past the compressor seal and make embarrassing smoke.
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Tommy_J screwed with this post 03-06-2011 at 12:57 PM
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Old 02-03-2011, 07:33 PM   #9
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Old 02-03-2011, 07:45 PM   #10
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Old 02-03-2011, 07:48 PM   #11
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Are you making a pressure box for the carbs?
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Old 02-03-2011, 08:27 PM   #12
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Good thinking! I'm in.
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Old 02-03-2011, 10:11 PM   #13
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Quote:
Originally Posted by awork13 View Post
Are you making a pressure box for the carbs?
That's the plan
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Old 02-04-2011, 01:37 PM   #14
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Saw your comment on the 990SM Turbo thread and had to join here.
I wondered when the convenience of the SM exhaust header outlet would be exploited with a whistle. The routing for pressure to plenum could all be contained within the bodywork, under the seat, with room left on the other side to pipe the exhaust outlet through a short can. Stealthy indeed.
Plus, with a rear mount, there's no messing with the oilbag or its plumbing.
Nice use of a Chirbo, too. My kind of budget.

along for the ride
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Old 02-04-2011, 03:58 PM   #15
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Seriously interested in this! I wish you the best of luck.
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