Rotrex Busa Dragbike , TTS C38 low boost setup ...

Plan9 said:
Currently using AEM 400lph, probably too powerful... I was using a Chinese copy of 044, with NA setup , stated 300lph (?!). No troubles with that , upgraded when engine was charged. Just to be 'sure' ....

Dropped the engine this evening, just to find the gearbox gremlin :confused:
Kinda hoping it's torque issue with driveshaft... 150 lb ft or more from 7000 to 11000rpm... Nothing is wrong or worn , little bit shiny contacts as expected . Engine was used as road bike 30k kilometres (19k miles ) before me.
I ordered a Robinson driveshaft and a support bearing for it. Hopefully it solves the GB issues for good.

Fuel lines are sorted, (not done) but a decent strategy is made :D. Pressure regulator is hanging the air...

Hoping for a better next year , and season ...

Janne

View attachment 1674251

View attachment 1674252
Click to expand...
Hi. I have the DME mechanical pump. I also have the Robinson HD Out put shaft and outer support bearing. I have over drive 5th and 6th gears a 20 tooth front and a 34 tooth rear also the transmission is all back cut with bilet gears
 
michael parris heuberger said:
Hi. I have the DME mechanical pump. I also have the Robinson HD Out put shaft and outer support bearing. I have over drive 5th and 6th gears a 20 tooth front and a 34 tooth rear also the transmission is all back cut with bilet gears
Click to expand...
By my calculator that is over 300mph @ 12krpm (without overdrive 5/6 gears)... My 18/47 is like dirt bike gearing compared to yours ?!

Ok, my Robinson set arrived today , I have to make some tools to press new bearings to both shafts.
My subframes are not making themselves, have to do something with those. Got a seat frame done , but rear subframe for a new fairing is far from finished. My radiator is behind seat and electric water pump is (probably) under the seat , a couple of things to measure and plan...

I know the rear fairing looks a bit long , I wanted it a bit longer than the last one, a bit of room to swingarm growth. :D

IMG_0862.jpg
 
Plan9 said:
By my calculator that is over 300mph @ 12krpm (without overdrive 5/6 gears)... My 18/47 is like dirt bike gearing compared to yours ?!

Ok, my Robinson set arrived today , I have to make some tools to press new bearings to both shafts.
My subframes are not making themselves, have to do something with those. Got a seat frame done , but rear subframe for a new fairing is far from finished. My radiator is behind seat and electric water pump is (probably) under the seat , a couple of things to measure and plan...

I know the rear fairing looks a bit long , I wanted it a bit longer than the last one, a bit of room to swingarm growth. :D

View attachment 1675155
Click to expand...
Hi. It look very good. I do have the Robinson OD 5th and 6th gears. I want to be geared to about 315 to 320 MPH to see how the bad the wheel spin is. It is als built for 13500 RPM but I do not wan to hold it at that for very long.
 
michael parris heuberger said:
Hi. It look very good. I do have the Robinson OD 5th and 6th gears. I want to be geared to about 315 to 320 MPH to see how the bad the wheel spin is. It is als built for 13500 RPM but I do not wan to hold it at that for very long.
Click to expand...
I got scared of 12500rpm when coolant got spilled at 1/4 mile mark .. :D
Rear tyre went +50mph in an instant , FuelTech did not react that fast... setup problem , probably :crazy:

Please keep us updated with your 300+ mph timezone , I'm sure most of this thread followers are interested ...
I'm aiming 8.5 to 7.5 sec 1/4 mile , with a 270 - 320 kph (about 165 to 200mph) trap speed :bowdown:

We have had a deep freeze here from new year , not much happened anywhere , nothing around Busa ...
De-freezing house- and company waterpipes , drains and stuff. Keeping oil burners alive ...
This years HIGH temp is -22.1c . (-7.6 F)
LOW is -35.3c (-31 F) , and the weather have been under -30c (-22f) since new years day 5pm.

Kinda hard to imagine sweat inside leather suit .....

Best wishes ... New Year , New Season. Whatever you like, whatever you wait.

Janne L
 
Plan9 said:
I got scared of 12500rpm when coolant got spilled at 1/4 mile mark .. :D
Rear tyre went +50mph in an instant , FuelTech did not react that fast... setup problem , probably :crazy:

Please keep us updated with your 300+ mph timezone , I'm sure most of this thread followers are interested ...
I'm aiming 8.5 to 7.5 sec 1/4 mile , with a 270 - 320 kph (about 165 to 200mph) trap speed :bowdown:

We have had a deep freeze here from new year , not much happened anywhere , nothing around Busa ...
De-freezing house- and company waterpipes , drains and stuff. Keeping oil burners alive ...
This years HIGH temp is -22.1c . (-7.6 F)
LOW is -35.3c (-31 F) , and the weather have been under -30c (-22f) since new years day 5pm.

Kinda hard to imagine sweat inside leather suit .....

Best wishes ... New Year , New Season. Whatever you like, whatever you wait.

Janne L
Click to expand...
Hi. Willaford was the 1st into the 5 sec and DME and others too Moor was the 1st to put it out to the world
 
Hi , again...

Small update, planning to move front fairing about 3 inches forward. Just to make room for my helmet behind the windshield.
Since my seat is going to be 2 inches lower and about 8 inches closer to front of bike, I thought it was a good idea to move the windshield (and the fairing) forward...
'Necking' the frame is kinda pointless , the supercharger is in the way. I might alter front fork angle a bit with custom triple trees one day...

One question about gearbox. What is the function of 'friction ring' , at drive shaft , inside 2nd gear free gear ? Is it just to prevent oil leaking from inside the driveshaft, or is it holding the gear not to rotate freely ?!? It was a pain in the a## to install , had to use the old bearing to install a new friction ring to base of drive shaft.

Janne


tempImageuxW4qh.jpg
 
IMG_1221 1.jpg


IMG_1235.jpg


A bit slow spring, a month to first race, bike is still far from race-ready...
Spent easter at Helsinki Exhibition centre , American Car Show ... Our class sponsor wanted a selection of bikes , supercharger was needed :)

It looks like a bike , but a lot to do in a month.

Let's keep fingers crossed I can make it a race bike in 3 weeks or so.

Janne
 
I have not forgotten this forum or my friends here ..

Too much going on right now to write a season recap . I try to do it in few weeks.

New best et and speed. Race class upgrade because quick 60' times...

7.945 / 282kmh (175mph) , best 60' 1.268sec

Take a look at my YT account , there is a couple of new videos...
Plan 9 Racing

Best regards
Plan 9 Racing
Janne
_I6A4739_small.jpg


_I6A4215_small.jpg


_I6A4041_small.jpg
 
powerfulone said:
Looks strong and consistent. The fastest I ever did was back in 2007 with a 8.01/186. Stock chassis, 66 wheel base, 10 kg of lead on the front axel. Thats now illegal now. I would love to build an all out short neck etc super street bike just to see how fast I could go but time is against me. Keep up the good work, flying the supercharger flag :)
Click to expand...
Hi. DAS weny 6.49 with a Pro Charger busa in XDA. I just bought a bike with a Pro Charger from him. She will be riding on the back with me.

20240930_121305.jpg


20240930_121231.jpg


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Dnyce said:
I was referring to the white/red bike plan9 posted
Click to expand...
Thanks for questions , sorry for not answering sooner...

Bike is not a street bike , by any standards . We don't actually have any regulations for sound in races...
Have you guys heard a supercharged busa scream 11+krpm live ?
That muffler has a half inch sound absorbing volume around straight pipe , mainly for pit comfort :D

Exhaust is 1 3/4" from head ports, 2" from first collectors and 2,5" when in one pipe.

As supercharged bike , it is Very Loud without any muffler .
Burnout and 2-step is very loud, muffler or not...
I can't handle NA bikes with open side-winders , when in front of me in line-up.
I don't like to racers behind me at line-up to suffer ...

If you guys have ANY questions about my bike , just ask .... I'll answer .

In mean time go look at my on-board videos , with FuelTech telemetry gauges at :
www.youtube.com

Plan 9 Racing Supercharged Hayabusa Dragbike

Plan 9 Racing Supercharged Hayabusa Pro Competition Bike -class DragRace-team from Finland 7.500 sec index WEB cams, Wiseco pistons Valves and springs changed , comp.ratio lowered Rotrex C38-91 supercharger E85 fuel, full teflon fuel lines, 0,77 USgal (2.9L) tank MTC Gen II Multistage Lock-up...
www.youtube.com www.youtube.com

There is two kinds of people who boost a Busa: those who have melted a piston , and those who have to melt one.
I have to admit , I've upgraded myself a step :)


Janne
 
Cause of failure is a bit of a mystery, secondary fuel injector feeding cylinder #3 was not working properly.
Was it debris in fuel lines, electrical bad connection or something else , I don't know for sure...
Ecu tried to correct fuel mixture, since lambda was acting up from mid summer. I got new injectors for this summer, and they were just inspected, no apparent problem there.
Three exhaust ports were black , they were running rich, one had a hole in piston , and clean exhaust port...

Janne
 
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