Hi guys,
I spoke to a guy from japparts who told me an sc12 would be a little big on a mini,
but he suggests an amr300?
has anyone used one of these before?
thanks,
Rick

SC12's seem to go fine on mini's , an AMR300 comes from a 660cc multivalve Subaru engine , they can be used on 998' but are a bit small for decent power out of anything bigger .

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the amr300 like sports850 is only good for a little power and it should only be used on a 998 or smaller.
if your looking for a little more power the amr500 is very suitable for engines up to say 1.5L and should be a bit easier to find than the 300

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

so the 300 will give me good power on my 998?
will it be better and easier than an sc12?

Don't know about good power but it will give you a bit more . Yo0u'll have to make all your brackets and pipes from scratch though whereas there's a really good kit to put the SC12 onto a mini engine availible for less than $1000 (from memory , supply your own SC12 and carb) from 92 , Ben Afford .

Here's a link to where someone here has put the AMR300 onto a moke , a neat looking job really . http://www.ausmini.com/forums/viewtopic ... ght=amr300

Put AMR300 into the search engine and you'll see a few setups , also do the same for SC12 and have a look at them .

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fitting superchargers is pretty much half a dozen of six of the other, it is a whole lot easier to fit a charger than a turbo due to not having to make miles of intercooling pipes or changing of the manifold.
the sc12 whilst being the most popular (ever..) i feel would be just to big for the 998, id look for the amr500 if your doing this sort of mod to a sub litre engine.
whilst the 300 is small and fun, the most it will ever achieve is between 60-70Kw.

my 2c

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

I have a amr 300 on the red 998 moke. I gives me 6 psi boost. It has added a fair bit of pickup and the thing keeps going when it use to run out of puff.

I put it on a dyno before hand and I had a throbbing 30.2 HP at the wheels. I have just about got it set up for another dyno run soon. I will post the numbers when I have got them.

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It's not a mini, but still a bloody lot of fun! (and keeps me poor)

The AMR300 pumps 300cc's of air per revolution and comes off a 660cc engine and an AMR500 pumps 500cc's so in my eyes the AMR500 would suit the 998 better (but like Moke'n'Andy an AMR300 will still help ). I think the SC12 pumps 1200cc's of air per rev but I'm not sure what exact sized engine they come off.
With that you can get an idea on what supercharger(SC) will suit what engine size. I have a setup for an AMR300 about 80% finished and I've decided to ditch the AMR300 and go for a bigger SC like the sc12 or bigger. That way, depending on the size of the drive pulley I'll be able to put it on any mine engine
If your handy in a workshop you should be able to make your own set up to suit any SC and mini, just do some research first and think about what you want from your engine. IMO you should be able to run around 6psi on a healthy standard engine, if you want more boost than that you should look at building a engine to suit = big $$$$.
If you have a small bore engine ask your guy for a AMR500 otherwise get the sc12, also what sized engine do you have?

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Respect mine and I'll respect yours.

My SC12 running the kit's standard pulleys it makes 7psi on flat chat. My engine is a 1330cc.

IMO bigger will be better, as if you run a larger pulley on the charger say, less heat should be generated, therefore more power, or less chance of detonation at least.

IMO running bigger (more cc's per revolution) but slower spinning is better than smaller but faster spinning. Also it depends on design. The SC12 is a "roote's type" blower and they are notoriously inefficient.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

I considered the AMR300 route but I did all the calculations and you really can't run much boost without spinning the pool lil thing waay faster then it's sposed to even on an 1098cc

I reckon an AMR 500 would be perfect if you want low to medium boost and it's still compact.

As slinkey alluded to, a smaller charger spinning faster to create the same boost as a larger one spinning slower is going to create more heat, etc, which means less power, increased risk of detonation, blah blah

Depending on boost levels, I'd recommend an SC12 if you're even considering getting up around 10psi, but an AMR500 should be fine for less.

The SC12 came of the 1.6L 4A-GZE Toyota engine, while it's bigger brother, the SC14, came off the 2.0L 1G-GZE Toyota six cylinder. IIRC the 12 and 14 relate to the cc they pump out ( 1200cc and 1400cc per revolution )

I'll try to dig up my boost vs supercharger rpm calcluations which should help


EDIT: Found it! This is based on running 7 psi ---



(7psi + 14.7psi) /14.7 = boost ratio ( 14.7psi is normal atmospheric pressure )

x by 1/2 engine displacement (i.e 2 cyl fire every rev) this is the volume required per rev

volume required/blower displacement = pulley ratio

7000rpm x pulley ratio = blower speed ( 7000 rpm is your redline )



--- So for a 998cc running 7 psi with an AMR500 which pumps 500cc per rev: --

(7psi + 14.7) /14.7 = 1.476
1.476 x 449 = 736.524
736.524 / 500 = 1.473
7000rpm x 1.473 = 10311 supercharger rpm

So! at 7000rpm your supercharger will be spinning at 10311rpm! That's getting a little tooo fast for me! So if you want to run any more boost than that, go the SC12

thanks guys,
my engine is a 998 with full head work done and block has been rebuilt,
new pistons rings, crank,
pretty much anew motor now with a worked head.
sc12s seem to be so rare these days and I can get an amr500 for $330.
but the kits for the sc12 are easier to buy.
oh choices

unless someone has an sc12 they wanna part with?

Logon to a toyota forum. Eg Toymods, or a corolla or Mr2 forum. Have a look on their, I paid $250 for mine is relaly good nick with a bunch of other Toyota bits (which I didn't want but turned up in the post anyways).

Spaceboy got his for $150 I believe - I think.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

tried there,
getting pretty rare now though.