Supercharger choice
Turbo Mini Forums

First post here after lurking for a while and being chivvied into joining by Turbo Dave, so be gentle...

I've been wanting to supercharge an 1100 engine for quite some time, and was going to blindly go down the VMAX/Jonspeed blowthrough route until an in-depth discussion with TD and DV over a few drinks persuaded me that it was better to go blow-through.
To this end I have acquired an Eaton M45 'charger from a BINI (though it is a bit of a dog and am chasing the seller for a refund...) but I now see that the M62s come with a built in bypass and a 'better' shaped inlet.
Link: eBay ad No 130144115672

Does anyone have any experience of the m62 ?

Edited by Alex on 17th Aug, 2007.

Metric is for people who can't do fractions.

Well, as you have an 1100, the M45 is by far the best shoice if you want an Eaton.

Assuming a 6000rpm rev limit (sensible for an 1100) a 1.5 pulley ratio would do 11psi boost, a 1.6 would be 12.7 psi, and a 1.7 14psi of boost with a max blower speed of 10200rpm.

If you want a different model of M45, look for the M45 from the Mercedes SLK's. These also have an electric clutch IIRC. These might be gen-2 uniots however, so not quite as efficient as the Bini units - but still a million times better than no SC at all LOL!

Remember - despite what folks will try and tell you (except for some who really know) Eaton's are NOT good at high boost. Over 10psi and you start chasing your tail. over 16psi and you may aswell not bother.
If you want a well-made, long-lasting, quiet unit - they are about as good as they get. :)

Stick a Rotrex on it....

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

I'm using as SC12 from a supercharged Corolla, it works well with my 1330, and there's an 1100 Mini here in Adelaide (Australia) that has the same setup.

I can't help you with your project too much, but I'd like to say good luck! And ahve some fun with low down boosted torque...oh yeah!

Supercharged 1964 Morris 850 - Now 1330cc with 7psi.

6000rpm was the redline I had in mind - the crank has been balanced, but it is still an awfully long stroke to fling around and I haven't done a centre main strap (yet).
The pistons are +.060 and have a 12 or 13cc dish, combining this with a lightly skimmed 12G295 head will give me around a 7.9ish cr so I wondered whether that would compensate for the extra displacement of the larger Eaton 'charger.
On the other hand, I'm not dead set on an Eaton, they're just easy to get hold of and a Rootes type seemed better suited than a twin screw - having said that though, does it make nay difference if I go blow through with a TBi ?

Metric is for people who can't do fractions.

Another vote for rotrex here. So small, but so much boost! Had one on my old golf, was excellent.

they sound mental too...

What charger did that black mini have on it at MITP, sounded awsome...looked like he was getting a handful of torque steer too. :)

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1/4mile in 13.2sec @ 111 terminal on 15psi

Ohh yeah I saw that one, he was all over the place on one of his early runs.

Think thats a Vmax setup, i've seen them with a webber anyway....

I looked into an m62 charger a little while ago. The main problem was physical sizing to fit behind a standard grille and with my 16v head. Looking at a rotrex now though but they are expensive.

The Black one is mine, runs a m45 with nos.
Torque steer was exagerated by a problem with the rack, this got worse as the day went on, my times were poor as 1st and 2nd had to be taken with great care.
Still managed over 100mph over the line with nos in 3rd and 4th

mini23, was your number D1 or D80 by any chance?

no c54 or c56 i think, i'd have to check the slips

With a Clubbie Estate, I don't have to worry so much about the slightly larger size of the M62, though I suspect the M45 comes with the bypass valve too - it's just not fitted to the Bini.

Metric is for people who can't do fractions.

mini23 are you sure its your rack? Its just im having major problems with torque steer 1st and 2nd, I was thinking it could be more to do with caster angle?

What makes you think its the rack?

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1/4mile in 13.2sec @ 111 terminal on 15psi

With the car stood still there's a large amount of play before the wheels start to turn.
Before I go to Combe i'm going to have the geometry set up properly, i'm sure the caster angles are wrong also

Hmm thats got me thinking about mine then? Mine has a little play before the wheels turn, I ssumed that was normal, I'll have to compare it with a known good one.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Wide wheels / wheels that protrude from the arch will increase torque steer, part of my reason for being so fond of 13x6s!!!!

My basic rule of thumb is that if the wheels can't be covered by Grp2 arches they are probably not suitable for a road going Mini.

If you need wide wheels (for whatever reason) then you'll have to live with it to some degree but careful attention to castor angles, camber (as the Mini has quite a bit of roll induced camber change on the front and also has bump steer) and balanced corner weights it can be reduced.

Any slack in anything will highlight the issue too.

I know some people like small steering wheels but don't underestimate the effect they have on being able to hold on to the car! I never fit anything smaller than standard and sometimes (on really heavy steering of track biased cars) go as large as 14".

Every day is a school day ...........

How fast and how expensive ...... the same question...