950 Supermoto Turbo Build Thread

[Tommy_J]

Originally Posted by snowhawk jockey

I hope you can resolve your slippage perception. The tech from Peterson's was pretty interesting, right? I was surprised to hear stock springs and HD plates were lasting a full year of racing.

Don't know if you guys noticed, but they don't run a radiator!!
The motor certainly sounded like it wasn't spinning up during the climb. At that low of RPM, do you think 125-150HP to the tire, and what kind of torque? I don't know how the 50/50 nitro blend works with the injection system, but the bike was effortlessly digging its way anywhere Bret wanted to go. Even when he looked crossed up and getting sideways, he motored right out, flinging a truck load of dirt as he went. Traction blow out/forward momentum is probably their biggest problem.

With Nitro those numbers wouldn't be too surprising. That stuff makes excellent cylinder pressures. Its a testament to KTM that they can run stock pistons. That's reassuring for the turbo project!

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[Tommy_J]

I mentioned this bike went on a diet, in addition to the Li battery. Eliminating the left muffler exposed the rear fender, which is fairly ugly since it was made to be hidden by the exhaust. I decided to fix this with a fenderectomy. This is fine for SoCal but would be less appealing in wetter climates.



Here the fender is removed and the aluminum foil insulation is partially pulled off.



The weight was cut in half by cutting the fender in half



Conveniently, there are holes in the subframe gussets which can be used to support the rear part of the fender. These holes were countersunk to fit some Ti fasteners I had. Rubber grommets of appropriate length were cut from rubber hose. It bolted right back in and the lithium battery was installed.

[snowhawk jockey]

Nice fender trim. I would do the same to clear the ugly sides but use all the space in my trunk, for junk. You could fold a close out plate with some tabs and rivet it on. A little silicone around the edge and you'd be back to rain/puddle/dirt resistant. If you offroad that baby much, it might be a good idea, just to keep the space from filling with dirt and rocks.

[snowhawk jockey]

Bump TTT

I fiddled with the FCR's the other day, swapped to my carbon can and wondered if you had gotten any new action developing your turbo.
I can get the tank off, change needle clip and put it back together in less than a 1/2hr (barring additional hunt time for any dropped parts).
How is the new plenum for on and off time?

[y2blade]

Originally Posted by Tommy_J

I kept thinking I would get around to making a slick video. Here's a clip from today's ride. Its not slick and the sound sucks but its something.

This is actually a pretty steep climb and the torque is very satisfying for this kind of riding. The boost gauge reads in inches of mercury where 10 inHg is actually less than 5 psi.

just catching-up with this thread

fantastic project

following with interest

[pennswoodsed]

Originally Posted by Tommy_J

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.

Here's the efficiency map

My kind of crazy, is map from actual turbo or the kkk original ?
Thanks,Ed

[katumo_jtb]

Wow, that thing is so cool and even more amazing, it runs!

Two questions about the intake plenum, if you don't mind. Let me preface by saying I have never worked with turbos, so I'm looking at this as a relative outsider:

1. I would have thought building the carbs inside the plenum would get rid of several problems. You wouldn't need a separate boost line for the vents, nor worry about the carb internals holding up to the extra pressure differential. Also sealing the plenum to the head rather than carb boots might be easier, and carb jets/needle would be more accessible. Why did you decide to keep them separate? Was it just to simplify the shape or is there something I'm missing about how blow-through works?

2. Where did you get the aluminum mesh plate for the air filter housing? It's exactly what I need for an intake project, but I haven't been able to find it.

Again, kudos on this project. The design is brilliant and the execution is inspiring. Many have said this already but if I were you I wouldn't tire of hearing it

John

[Michael Back]

Hello !

Thanks for the great info. I recently joined the Orange club and have purchased a KTM SM950. I´m very curious what windscreen is fitted on FangFactor´s bike ??

Thanks for your assistance in advance.

All the best.

Michael Back, Denmark

Originally Posted by snowhawk jockey

The ADV or SE headers bolt right up to an SM or SMR(same exhaust). The standard ADV 2-into-1 conversion process can then be done for a single muffler. The fringe benefit to ADV pipes are the added ground clearance!!
This is FangFactor's bike, he is in Australia:



A stock SM header is an easy single side conversion, it is already a single pipe at the end...
I took my 2-onto-1 to a well known exhaust mfg and they said that there isn't enough of an SM market to even recover their tooling costs. The name brands do business in the thousands of pieces and not dozens.


ETA: pics

[brianwheelies]

Originally Posted by Michael Back

Hello !

Thanks for the great info. I recently joined the Orange club and have purchased a KTM SM950. I´m very curious what windscreen is fitted on FangFactor´s bike ??

Thanks for your assistance in advance.

All the best.

Michael Back, Denmark

Looks like something by Screens For Bikes from OZ.

[rattis]

Whatever happened to the turbo bike?

[GI_JO_NATHAN]

Almost forgot about this.

[Tommy_J]

I really should do some follow ups. Sorry for letting the thread go quiet for so long.

The bike is running great. It hasn't blown up or given me any grief. I've done a bunch more minor refinements to it which I'll try to write up.

[soupknotzee]

Originally Posted by Tommy_J

I really should do some follow ups. Sorry for letting the thread go quiet for so long.

The bike is running great. It hasn't blown up or given me any grief. I've done a bunch more minor refinements to it which I'll try to write up.

[GI_JO_NATHAN]

Originally Posted by Tommy_J

I really should do some follow ups. Sorry for letting the thread go quiet for so long.

The bike is running great. It hasn't blown up or given me any grief. I've done a bunch more minor refinements to it which I'll try to write up.

Nice!
Really happy to hear that.

[snowhawk jockey]

Originally Posted by Tommy_J

I really should do some follow ups. Sorry for letting the thread go quiet for so long.

The bike is running great. It hasn't blown up or given me any grief. I've done a bunch more minor refinements to it which I'll try to write up.

I would love to see how you have refined your concept!

Tell us more tell us more!!!