supercharge or turbocharge 1275 auto spi
Turbo Mini Forums

Hi all, im new here so be gentle :)

I have a 1995 1275 auto spi Mayfair. I like the injection and I like the auto. I would like some more poke and I have looked at supercharger kits at £1850 and i'm in talks with Stuart from vmaxscart. My current issue is that with it being automatic, it has a kick down linkage and when fitting a supercharger the throttle body is relocated towards the front of the engine bay.

My second thought was to turbo it. I don't want to cut the bulk head and the mirage manifolds don't look to be available any more?
I would imagine that if I can supercharge the standard spi system to between 90-100hp without running lean then I would be able to do the same with a turbo setup?
does anyone know how much boost it will take.

I'm not after a rocket sled, it goes well as it is but 90hp from 50hp would be nice.

here are some photos of the linkage.

mine: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=570945

what other mods are you planning head intercooler ect will all determine boost

Done now needs redoing lol

A turbo or Supercharger will overwhelm the transmission. The clutch bands start to slip at about 75hp Naturally Aspirated.

I'd just apply some sensible N/A tuning. Modified head, LCB & exhaust, maybe raise the compression slightly (if it's a low comp engine) maybe hunt for a cooper spi ecu??

If something is worth doing, it's worth doing half of.

A few mirage manifolds have been for sale recently (I bought one in the past few months) you've just got to keep an eye out for them

They don't die, they just get faster!

There have been some autos running 140hp ive been told. I may have read mra minis saying that on a forum somewhere. At the minute I have k and n replacement filter, rc40 cat back with decat pipe. I know the cat doesn't make much difference, it was done for sound only. I understand I will have to decompress the engine if I go forced induction.
I believe it is the low compression engine 9. something to 1.
The engine has only done 50k with full service history and the autobox has been refurbed in 2008 and only done 1500 miles since.
the reason I thought small turbo or supercharged was so I didn't loose any torque.

mine: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=570945

SC typhoon upgrade alot better IMO

http://www.theminiforum.co.uk/forums/topic...ed-a-1275-auto/

Im not trying to be irritable, I just dont really want to change to a manual if the auto can take the extra power. The reason for keeping the spi setup is purely emmisions as I dont have a friendly mot person.

mine: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=570945

I think the comments by MRA (does he still exist as a viable business?) back up what Colin and Steve (sprocket and benross) have said.
In standard form the auto box is limited. MRA makes it clear several key parts have to be uprated (and isn't prepared to say what they are or where to source them).

Personally I don't think auto boxes are quite the black magic most people assume, I've never had a Mini one apart but have had a conventional layout one apart and it was just sets of epicyclic gears with band brakes and clutches operated by oil pressure.

So I suspect the issue is finding what you need to upgrade and where to get hold of them....

Schrödinger's cat - so which one am I ???

I can tell you where to take your car for mot and it will pass they are mini nuts too and good bunch of lads very honest

Done now needs redoing lol

Not worth doing, I have had auto's with low mileage from Japan they crap them selves far to easily, or you get up and had reverse yesterday and now don't no reason no explanation anyone that knows them will fix them no probs but at £1000-£1500 a time. A tuner going down the helping you get it to work just because its in theory it should isnt helping you (medium/long term), unless you really need auto the sensible route, would be as suggested, find a cooper ECU fob and immobiliser box, a decent modified head, something like a maniflow manifold and de cat pipe, (keep cat for MOT but a mini friendly garage wouldn't bother testing but still keep it) you will have more power, still reliable, and if the auto pops through over exuberance or just cause it was tuesday, then the parts you have invested in will be fine for the good used but getting rare to find donor manual SPI lump.

Ok. I have been on to mra minis. Basically to make the auto box take power I would need deeper pockets. So thanks for all your help. I think im going to go with what skolawn and others have said and go modified head route and cooper ecu as I can when the time comes use all parts on spi manual.


Wng691s clubby i would be greatful for the name of that garage.

Can anyone recommend a place to buy a head?

mine: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=570945

This is a cool auto box

And Martin (MRA) was gonna start building a 1275 turbo auto. but how far this got couldn't tell you.

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As soon as you want a powerful mini you need deep pockets!

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

looks like a sequencial in an auto casing.