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Tommy_J 02-02-2011 07:25 PM

950 Supermoto Turbo Build Thread
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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.

Tommy_J 02-02-2011 08:09 PM

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

andyhol 02-02-2011 08:37 PM

standard 950 supermoto not enough?
increase off-road ability and add a turbo?

too awesome and really fucking crazy:deal, good luck

Tommy_J 02-02-2011 09:33 PM

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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

duxrneet 02-02-2011 11:16 PM

Subscribed :ear

OaklandStrom 02-02-2011 11:23 PM

Holy crap. :eek1
Subscribed! :clap

Tommy_J 02-03-2011 05:28 PM

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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.

Tommy_J 02-03-2011 05:39 PM

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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.

SimpleSimon 02-03-2011 07:33 PM

Subscribed! :evil

1200B 02-03-2011 07:45 PM


awork13 02-03-2011 07:48 PM

Are you making a pressure box for the carbs?

anonny 02-03-2011 08:27 PM

Good thinking! I'm in. :lurk

Tommy_J 02-03-2011 10:11 PM


Originally Posted by awork13 (Post 15105797)
Are you making a pressure box for the carbs?

That's the plan

snowhawk jockey 02-04-2011 01:37 PM

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 :freaky

cnw126 02-04-2011 03:58 PM

Seriously interested in this! I wish you the best of luck.

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