Recent content by Plan9

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

    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...
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    New TTS Left side supercharger conversion for Gen 1, 2 and 3.

    Just make sure you have wires to suit Pingel's power requirements... I'm using a boring air shifter (budget), but a friend of mine did some stunts with excellent Pingel shifter... He almost burned his methanol-burning NA 1kGixxer just because wiring was not made for 40 amp fuse . Pingel likes...
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    Rotrex Busa Dragbike , TTS C38 low boost setup ...

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

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

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

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

    Busa wire loom weight is 3.9 kg, about 8.5lbs. Without most sensors and stuff. Fuse and relay holders included... Made plugs to original secondary injector holes from 1/8" brass plugs . Secondary injectors are moving to plenum. This summer I had a capacity of 1150cc / piston , duty cycle was...
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    Comment by 'Plan9' in item 'Supercharged 2008 Busa Dragbike'

    Thanks, Yes, I bought the bigger option for a SC , to have a room to grow as racer , to learn to setup clutch , height control and the full experience... What's holding me back, mainly doing this out of my own back pocket , engine mods cost a serious amount of money. Next year , beside...
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    Rotrex Busa Dragbike , TTS C38 low boost setup ...

    It was a bit sad to 'kill' engine above 8500rpm @1st gear (ign adv 30+ btdc to 16 ), but we had a plan to modify the seat position for next summer. So we decided it was easier to just manage the last race with slow 1st gear , and not to hassle with height sensor and it's setup (too much) yet...
  10. Supercharged 2008 Busa Dragbike

    Supercharged 2008 Busa Dragbike

    Bought this bike as stock street bike 2019. Raced it two years with stock engine, with clutch, fairings, ECU and swingarm mods, @ 9.5 second index class. Upgraded to supercharger , stiffer valve springs, thick base gasket to decrease comp ratio a bit . Adjustable cam sprockets, better conrods ...
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    Supercharged 2008 Busa Dragbike

    This thread is for the general discussion of the item Supercharged 2008 Busa Dragbike. Please add to the discussion here.
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    Rotrex Busa Dragbike , TTS C38 low boost setup ...

    I had 310 hp / 10500rpm @ rear wheel over 150 lb ft between 7000-11000rpm Clutch setup was better at the end of season, but gearbox 'gremlins' came back... At last race I was killing power with ign. advance at 1st gear , from 8krpm upwards. Bike was just wheeling and climbing @70mph. I'll...
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    Rotrex Busa Dragbike , TTS C38 low boost setup ...

    A new video from Finland... Done some clutch setup mistakes this summer, pneumatic gear change timing was off , a radiator nearly exploded, due to head gasket leak ... Fairly decent race this last one. Made my PB on 60ft and 1/4 ET, way too fast for 8.5 index bike . All and all this is a Very...
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    Rotrex Busa Dragbike , TTS C38 low boost setup ...

    Thanks, I have close to 16psi of boost at 11500rpm. First try was about 10psi , but with c38 charger and comp.ratio lowered, bike was not running properly. My problems were mainly with drag clutch, engine was not making enough power to make the clutch slip at start... But with 15-16 psi ...
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    Rotrex Busa Dragbike , TTS C38 low boost setup ...

    Thanks, Richard ! We changed belt pulleys a bit since beginning of June. Low compression was an attempt to go racing without expensive engine parts ... At low belt ratios (85/100mm and 85/90mm) , supercharger was actually helping busa breath, boosting it was not (ok, 0,6bar (9psi) was the MAP...
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