ausmini :: View topic - turbo as a supercharger?!

It won't work. You need to get it doing silly speeds like drmini suggested and turbo bearings are not designed for the type of load you'd be putting on them with a drive belt.

I've seen pictures of one on a mini - was being driven by a toothed belt from around the flywheel, so a HUGE ratio - I think the setup was effective, so if you think it'll work, just give it a go - what have you got to lose

Turbos spin up to around 100,000 rpm usually, good luck driving it that fast with a belt... :lol:

Centrifugal superchargers spin much slower, they are designed for belt drive and their scrolls are way bigger, they are not just converted turbos. :wink:

A supercharger loses power from having to be directly driven from a pulley type system off the engine. It takes power to make power, but the supercharger makes so much more power than it takes that you never notice it.

A turbo also robs power from the engine in the form of back-pressure. If someone tells you that a turbo doesn't use any energy from the engine, slap them

because they're full of crap as it goes against the laws of physics! But like a supercharger, when the turbo hits boost it makes more power than the it takes. But until it does, you feel the power loss through 'lag', simple right?

If you had to choose which uses less power, that would be a turbo system which is why they make more horsepower per psi when compared to a supercharger.

Author:	EAB [ Mon Jun 09, 2008 1:28 pm ]
Post subject:	turbo as a supercharger?!
ok so me and my brother are doing an experiment on one of my 998 engines, we are going to supercharge it using a turbocharger, basic idea is that you get rid of the exhaust driving part, attach a drive shaft to it and run it off a pully. way lighter than a normal supercharger and a whole lot cheaper, has anyone ever heard of this been done? or think it will actually work? apparently its a common thing for mini drag cars?

Author:	Blokeinamoke [ Mon Jun 09, 2008 1:38 pm ]
Post subject:
why would be lighter than any other scroll type supercharger? Lobe type supercharger are heavier but product more low end mumbo ebfore heat makes them ineffecient. Scroll type are poor down low but are lighter and more effectient. Sprintex and Raptor superchargers operate just as you suggest This spreadsheet will give hp and blower revs for different type - it includes whipple, scroll and lobe blowers http://www.sprintex.com.au/files/Blower_Calculator.xls

Author:	awdmoke [ Mon Jun 09, 2008 1:49 pm ]
Post subject:
Yes it will work. BUT it will not work as well as just using the turbo-supercharger (the proper term for a "turbo") as you loose the power drawn from the pulley.

Author:	EAB [ Mon Jun 09, 2008 2:17 pm ]
Post subject:
i was thinking of this as opposed to the normal turbo setup to avoid lag or am i better off just going with a small turbo or supercharger?

Author:	Mick [ Mon Jun 09, 2008 2:27 pm ]
Post subject:
Plenty of suppliers have done a gear or belt driven turbocharger. Many kits have been available because of the compact design that can be achieved with one of these. Upside is compact design and cost, down side is the positive coefficient of the design (supercharger with a more noticeable lag, but not as bad as a turbo on it's own) and the gears are also working very hard and may cause some problems later on. Take a look at this link, you may be able to get a turbo kit made up... http://www.capa.com.au/kits_ford.htm

ausmini https://www.ausmini.com/forums/

turbo as a supercharger?! https://www.ausmini.com/forums/viewtopic.php?f=2&t=42795	Page 1 of 2

Author:	Boostedmini [ Mon Jun 09, 2008 3:03 pm ]
Post subject:
If you get the drive ratio right it might be pretty good with less heat created too, remember that a turob can spin up to 20000rpm and beyond, so pulley ratio will need playing with. good idea and worth a shot

Author:	drmini in aust [ Mon Jun 09, 2008 3:35 pm ]
Post subject:
Turbos spin up to around 100,000 rpm usually, good luck driving it that fast with a belt... Centrifugal superchargers spin much slower, they are designed for belt drive and their scrolls are way bigger, they are not just converted turbos.

Author:	qa50 [ Mon Jun 09, 2008 3:44 pm ]
Post subject:
It won't work. You need to get it doing silly speeds like drmini suggested and turbo bearings are not designed for the type of load you'd be putting on them with a drive belt.

Author:	Boostedmini [ Mon Jun 09, 2008 3:51 pm ]
Post subject:
sorry was meant to write 20000RPM corrected now thanks Doc

Author:	simon k [ Mon Jun 09, 2008 4:50 pm ]
Post subject:
I've seen pictures of one on a mini - was being driven by a toothed belt from around the flywheel, so a HUGE ratio - I think the setup was effective, so if you think it'll work, just give it a go - what have you got to lose

Author:	KLAS [ Mon Jun 09, 2008 5:02 pm ]
Post subject:
qa50 wrote: It won't work. You need to get it doing silly speeds like drmini suggested and turbo bearings are not designed for the type of load you'd be putting on them with a drive belt. it does work, allready tried you have to use ballbearings and a homemade gearcase as the "turbo bearing" is inside the bearing (middle) section of the turbocharger and this will not be used, only the compressor side gets used. but you have to use first quality material. i broke 2 driveshafts (homemade, too), couldn't find affortable gears and the cheaper ones didn't last and made big noise. and regarding all the time doing it it will be cheaper buying one made for the job

Author:	cush [ Mon Jun 09, 2008 5:37 pm ]
Post subject:
simon k wrote: I've seen pictures of one on a mini - was being driven by a toothed belt from around the flywheel, so a HUGE ratio - I think the setup was effective, so if you think it'll work, just give it a go - what have you got to lose it was in a miniworld/minimag a bundle of years ago.. seemed to work ok...

Author:	dbr11k [ Mon Jun 09, 2008 7:15 pm ]
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could have sworn i put this pic up?? oh well here go's.. apparently there is a lot of machining work involved, with getting the shafts and what not dead strait... but i think it made something like 130hp

Author:	spraycanmansam [ Mon Jun 09, 2008 11:33 pm ]
Post subject:
drmini in aust wrote: Turbos spin up to around 100,000 rpm usually, good luck driving it that fast with a belt... Centrifugal superchargers spin much slower, they are designed for belt drive and their scrolls are way bigger, they are not just converted turbos. I was hoping someone would bring this up The whole design of the impeller is completely different because of the lower rpm. And I'm tired of hearing all about the 'drain of power' from a belt driven supercharger... anyone who says that turbos don't suck power from the engine are kidding themselves. Here's a quote of mine from another forum --- Quote: A supercharger loses power from having to be directly driven from a pulley type system off the engine. It takes power to make power, but the supercharger makes so much more power than it takes that you never notice it. A turbo also robs power from the engine in the form of back-pressure. If someone tells you that a turbo doesn't use any energy from the engine, slap them because they're full of crap as it goes against the laws of physics! But like a supercharger, when the turbo hits boost it makes more power than the it takes. But until it does, you feel the power loss through 'lag', simple right? If you had to choose which uses less power, that would be a turbo system which is why they make more horsepower per psi when compared to a supercharger. There's probably a few technical errors in that logic, but you get the idea

Author:	Kennomini [ Tue Jun 10, 2008 5:35 pm ]
Post subject:
dbr11k ya bastard you beat me to it If you want EAB I can post up the article for you.

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