2013 TURBO KTM 450 SXF TIMBERSLED BUILD

[cr500afx]

New Project build of a 2013 KTM 450 SXF.
Turbo + Fuel Injection + Electric Start
Baseline dyno of stock motor was 47 HP and 30 Ft-Lbs Torque.
Thats + 5 HP more than the 2009 Honda CRF 450 we started with last year.
A few pics of the build. Plenum, Clutch Lockout, Modified Clutch Cover.

 

[off road rider]

That looks great!! talk to us about the clutch lockout.
I'm not familiar with that at all, whats the benefit?

 

[tomk]

oh my...

 

[Rush44]

I can already hear my wife saying "no".

 

[cr500afx]

That looks great!! talk to us about the clutch lockout.
I'm not familiar with that at all, whats the benefit?

We're expecting to double the horsepower (as we did last year on the Honda's) so we'll need more clutch pressure to prevent slipping.

 

[J&L Snowhawk]

Turbo house

Is this for u again Scott? I'm guessing Kelly is doing the build

 

[Cat Bandit]

That's awesome! So what kind of elevation are you at? Cause i believe i read that the sxf450 was up about ten HP? Just bench racing stuff i guess, but I'm seriously thinking next year about getting one of these mostly for the e-start. It'll be awesome!

 

[cr500afx]

Is this for u again Scott? I'm guessing Kelly is doing the build

Yep, Kelly at KMS Performance is doing the build. Scott

 

[cr500afx]

That's awesome! So what kind of elevation are you at? Cause i believe i read that the sxf450 was up about ten HP? Just bench racing stuff i guess, but I'm seriously thinking next year about getting one of these mostly for the e-start. It'll be awesome!

We ride at 10 - 12,000 ASL.
The Dyno numbers are true rear wheel HP (adj to sea level).
They are always significantly less than manufacturers published numbers.
I don't know the KTM 450 SXF published HP.
On last year's build. the 2009 Honda 450 published HP was 57 and it dyno'd at 42 HP.
I'm looking forward to the E-start on the KTM.

 

[M5-]

I'm pretty sure the 57HP is at the crank.

M5

 

[wwillf01]

I was trying to search and did not find any info on how much your maintenance increases with the turbo. Are you maintaining them as if you weer racing motocross for engine rebuilds and valves? Or is it even more aggressive?

 

[cr500afx]

I was trying to search and did not find any info on how much your maintenance increases with the turbo. Are you maintaining them as if you weer racing motocross for engine rebuilds and valves? Or is it even more aggressive?

I dont do anything special on the 2 turbo hondas. No maintenance issues last season on either bike.

 

[cr500afx]

I'm pretty sure the 57HP is at the crank.

M5

You are correct!

 

[teal_210]

I dont do anything special on the 2 turbo hondas. No maintenance issues last season on either bike.

Are the Honda's for sale? I would love to hear a write up of the things that you learned and problems / solutions that you came across running these last season. I seem to remember a heat exchanger on the track, did they run hot, or was this planned from the beginning...

I'm guessing they must have ran pretty well if you're building another turbo unit - and using the same builder.

 

[SSWIM]

Are the Honda's for sale? I would love to hear a write up of the things that you learned and problems / solutions that you came across running these last season. I seem to remember a heat exchanger on the track, did they run hot, or was this planned from the beginning...

I'm guessing they must have ran pretty well if you're building another turbo unit - and using the same builder.

Scott doesnt sell anything.
Yea, the Hondas ran very well. Especially the "big" one.

Sam

 

[cr500afx]

A few more pics.
The turbo is just "roughed" in.

 

[SSWIM]

Hey, you going to use this

to haul your DONKEY.

Sam

 

[cr500afx]

Are the Honda's for sale? I would love to hear a write up of the things that you learned and problems / solutions that you came across running these last season. I seem to remember a heat exchanger on the track, did they run hot, or was this planned from the beginning...

I'm guessing they must have ran pretty well if you're building another turbo unit - and using the same builder.

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I am running one radiator and a M-heat exchanger on the turbo Hondas. Overheat problem was on only on long hard pack roads.
Only other issue was hard starting at first start of the day at cold temp, high altitude. The injector is much larger than stock and during start the PC5 hasn't taken over yet so OEM computer is sending fuel based on cold and stock (small) injector, which is way too much starting fuel for high altitude with huge injector so engine would easily flood. Ended up with fuel injector on/off switch and temp sensor on/off switch. This helped, but still had issues sometimes for that first start out of the trailer. We're working on a fix to recal the temp sensor for better startability.

Reliability-wise they were great.
Kelly at KMS Performance has the single cylinder turbo stuff figured out.
He does nice custom work that stays together.

 

[M5-]

So being a long time turbo sled guy and a KTM guy I'm following this project with interest. I have a question and that's why mount the turbo up front as opposed to under the rear fender,not saying its good or bad I'm just curious, is it single cylinder exhaust pressure, I've never turboed a one lunger?

M5

 

[J&L Snowhawk]

just a guess

I would say it is for quicker spool up. i dont know anything about turbos but that is my guess.