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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #1 · (Edited)
Hey from Sweden,
I have an ongoing project where I building a hybrid Caferacer that has an electric turbo / supercharger mounted and thought that this forum can be a good to be apart of!:)

MAIN PROJECT TASKS:
  • Will Electric supercharge motorcycle & dyno test results.
  • Create a AFR-tuning solution for optimization.
  • Rebuild bike in caferacer style.
More info: Graph-Tune 1.0 | Electric turbo / supercharger | Project

Gauge Camera accessory Measuring instrument Audio equipment Cameras & optics

Tire Wheel Fuel tank Automotive fuel system Automotive lighting

//Strömmarn
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #3 ·
Welcome, I do like the idea of a electric supercharger but this strikes me as a gimmick 270watts just isn't enough. can you use aux batteries and or capacitors that can charge from the bikes electrics then via a relay isolate and switch to provide she term high voltage for real boost on 3/4-wot before it burns out the electric motor.
Hey, are you sure there is too little power in the supercharger to give a boost? I'm not sure but it will be up to proof when the motorcycle becomes dynotested .. regarding the electricity, there will be two separate electrical systems but which work together through different solutions briefly described .. :)
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #5 ·
I'm happy to be proven wrong. A friend of mine put a Toyota supercharger made for a 2lt four on his 4lt diesel land cruiser and he asked me to work out the drive ratio which worked out he should overdrive it 50%, when I went over to help install it he had become impatient and put it on with the pulleys he had and despite only creating 2psi boost he was happy and said it was much improved.
So test it and lets see.
I'm not saying you'm wrong but I hope you'm wrong! We'll see what the dyno test says when it's time! :)
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #16 ·
Cool little piece of kit if it does work. I'll be interested to see how the Mukuni CV carbs handle it. Just trying to run pods on mine caused them to cack, I can't imagine how they would be able to draw open at all when boosted.
We will see I will test and see how it works and I have a few different alternative possible solutions I have thought of but want to test and see first ..
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #17 ·
I love little electric motors, lets see the motor and specs on the one that powers this.

Performance
Operating voltage: 12V-16V test value
Drive current: 26A measured value
Shutdown voltage: 0.8V throttle practical value
Full-speed voltage: 0.9V-2.2V use value
Linear drive: 0.9V-2.5V measured value
Speed range: 6800RPM-32000RPM
Wind speed range: 5m / s-86m / s measured value
Wind pressure range: 0.05kg / cm-0.2kg / cm with turbine test value
Adjustment mode: Throttle voltage signal is activated
Fan power: up to 240 watts
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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #18 ·
If it runs, I bet the carbs draw in air so fast at high speed the engine will be spinning his little fan motor pretty darn good.
Maybe he can see some positive gains at the battery if it's a DC motor/generator
Its an AC generator and here is the specs for the electric supercharger!:)


Performance
Operating voltage: 12V-16V test value
Drive current: 26A measured value
Shutdown voltage: 0.8V throttle practical value
Full-speed voltage: 0.9V-2.2V use value
Linear drive: 0.9V-2.5V measured value
Speed range: 6800RPM-32000RPM
Wind speed range: 5m / s-86m / s measured value
Wind pressure range: 0.05kg / cm-0.2kg / cm with turbine test value
Adjustment mode: Throttle voltage signal is activated
Fan power: up to 240 watts
Font Screenshot Number Pattern Parallel
Rectangle Slope Font Parallel Pattern
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #25 ·
That sure don't look or sound like no 30,000 RPM
Have you ever used a router? They are lucky to run at 24,000 RPM and they scream at that speed. Check what your actual no load RPM's are now from 12 volts,
then figure on a whole bunch of inefficiency called slippage in your blowers ability to actually produce some air pressure.
OK, we'll see.. :)
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #26 ·
Back in the bad old days, my solution to turbo lag was a couple of ping pong ball valves similar to old skin diving snorkels.
These allowed air in when the turbo wasn't up to speed and used turbo pressure to close it providing boost.
This makes the engine n/a off the mark (no lag) and produced more exhaust to get on boost quicker. Later I used reed valves.
In this case n/a till the electric turbo is turned on via a full throttle micro switch, then is just depends if it produces any boost.
OK, thanks for the suggestion with reed valves .. need to read more about them. Do you know if they are available as adjustable? I was going to use an electric selenoid valve but will take a closer look at reed valves first ..
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #27 ·
The modern day solution to turbo lag is to put in two small turbochargers like my pickup truck has. Extra valves don't produce pressure, valves can only hold pressure back.

A tiny fan introduced into the intake path is not going to provide boost, if the blower can't move his hand when he holds his hand against the output, it's certainly not going to force air and fuel into the engine with significant pressure. Might better aim it to the rear of the motorcycle and hope the air currents push you forward like a jet.
We'll see.. :)
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #29 ·
So did you hold your hand over the output and see if it actually produces pressure yet or can you hold the air pump back? That's a pretty simple pressure test.

... you should read up on how much power superchargers take to run them. Those technologies were developed during wars. None of them ever put little electric fans into the intake path to boost performance successfully. I'm sure it was explored.
Can unfortunately not perform your "test" due to the electric supercharger is mounted on the motorcycle .. but I just say we will see what the dyno test says further ahead .. :)
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #32 ·
What did the dyno say before you modified it?
It will be dynotested with the same conditions .. tested without the supercharger mounted and then with supercharger mounted not running and at full throttle .. with the same adjusted AFR-values for each test.. not tested yet but soon!:)
 

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Suzuki GS 450, 1981
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18 Posts
Discussion Starter · #36 ·
how much air can it flow and at what pressures? at 9,000 rpm it needs to flow 2,000 litres per minute to just feed the engine.

how do you link engine rpm to charger rpm?
Performance
Operating voltage: 12V-16V test value
Drive current: 26A measured value
Shutdown voltage: 0.8V throttle practical value
Full-speed voltage: 0.9V-2.2V use value
Linear drive: 0.9V-2.5V measured value
Speed range: 6800RPM-32000RPM
Wind speed range: 5m / s-86m / s measured value
Wind pressure range: 0.05kg / cm-0.2kg / cm with turbine test value
Adjustment mode: Throttle voltage signal is activated
Fan power: up to 240 watts
Rectangle Slope Font Parallel Pattern

Font Screenshot Number Pattern Parallel
 
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