Final Drive Supercharger??
Discussion
I've had some crazy ideas in my time but, this one came to me recently - given the challenge it is fitting a supercharger to a can-am / spider model.
Why not power it off the final drive? Boost increases steadily with road speed...
Think about it...
1). With engine attached superchargers, how many of us could actually use 1 bar boost in first, second or possibly even third gear and keep the tyres from slipping? Final drive superchargers would place the boost in a more useable range.
2). Charge cooling / detonation are always a problem with forced induction. However, having it kick in at higher speeds makes it simpler to cool the charge with good airflow (cooling increases with speed, as boost increases)
3). Drag increases as the square of the speed. With centrifugal superchargers, boost also tends to increase as the square of the speed. Kinda cancelling out the effects of drag... kinda.
4) It may be much simpler to mount the charger under the clip with a final drive approach than engine drive.
So am I nuts or could there be something there?
>> Edited by layada on Friday 12th May 18:02
Why not power it off the final drive? Boost increases steadily with road speed...
Think about it...
1). With engine attached superchargers, how many of us could actually use 1 bar boost in first, second or possibly even third gear and keep the tyres from slipping? Final drive superchargers would place the boost in a more useable range.
2). Charge cooling / detonation are always a problem with forced induction. However, having it kick in at higher speeds makes it simpler to cool the charge with good airflow (cooling increases with speed, as boost increases)
3). Drag increases as the square of the speed. With centrifugal superchargers, boost also tends to increase as the square of the speed. Kinda cancelling out the effects of drag... kinda.
4) It may be much simpler to mount the charger under the clip with a final drive approach than engine drive.
So am I nuts or could there be something there?
>> Edited by layada on Friday 12th May 18:02
ermmm no man i dont think that would work!
good for an alternator but i dont think it would work for a supercharger!
thansk Chris.
PS if you want FI but without the complexity of a normal set up, take a look at a STS rear mount turbo setup! i recon it could work on a ultima!!!!
www.ststurbo.com/c5_corvette
>> Edited by chuntington101 on Saturday 13th May 09:28
good for an alternator but i dont think it would work for a supercharger!
thansk Chris.
PS if you want FI but without the complexity of a normal set up, take a look at a STS rear mount turbo setup! i recon it could work on a ultima!!!!
www.ststurbo.com/c5_corvette
>> Edited by chuntington101 on Saturday 13th May 09:28
I don't know exactly what flow characteristics those centrefugal blowers have, but I expect that boost and flow rate wil both increase with revs. The main problem I see with running the blower off the final drive is that the volume flow requirements of the engine vary with revs not road speed. A secondary problem is that boost would *only* vary with road speed so the blower wouldn't see any difference between cruising down the motorway in top gear versus a flat out acceleration run. I think that running it off the engine is a better solution, but some sort of variable gearing or maybe even CVT would be an interesting option.
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