not mind but the sprintex sc setup
Turbo Mini Forums

Edited by minimole23 on 1st Oct, 2012.

It's all a bit of a compromise. To get any engine to rev you need a decent cam. But for decent boost threshold you need a milder cam.

Look at the Dons engine or John Ks 16 motor, both 9k screamers. And my mates imp, easily 9k, but he runs a relatively wild cam.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Two positive displacement machines running at a fixed ratio would normally create a fixed boost pressure. If it's not constant then there is a variance in VE or some leakage due to valve overlap. My guess is that the K1200 cams allow a lot of leakage and it's not until the inlet and exhaust pulses start to work together that the leakage is reduced.

To get a 1293 turbo to rev, you just need a big turbine and a cam to match. A GT25 or GT28 size turbine would do it.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

The thing that sold it for me was the linear boost vs rpm. Stick your foot down and you get boost. This what i wanted for my road car, efficient or not.

I've driven a few turbo cars, on boost they are really quick. But catch them of boost and they are flat as a fart. Then you get the turbo kicking in at mid revs and woosh, you're off torque steer and all. This doesn't make for an easy to drive (wife might have a go) road car.

My main point is that everybody's needs are different. Im happy with the gay supercharger, John likes the big turbo kick, Paul is trying to make the most efficient use of the engine and get as close to 100% efficiency as possible..Fair play, each to there own.

So what you are saying is that you want an engine that is good at low revs, but not very quick?

We have been through this many times. Drive a modern turbo car and you barley notice the turbo, drive a modified turbo car or one from the 80s and early 90s and you do get a more all or nothing engine. I love the idea of a supercharger, but modern turbos and fueling mean a turbo can be much closer to the best of two worlds than a supercharger can.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

I think Andy's reasoning is sound. He's built a car for a girl.

Using a smaller turbo you could get a similar result to an SC, but you'll never get away from the surge.

You should have a go in the sprint some time, it's dead easy to drive.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Mine should be good for a fair chunk over 100 bananas and it should pull all the way round to at least 6k+. Also the efi will help me get the best out of it. Fine for a road car.

Has anybody except graham driven a car with an sc12 pooper charger? I've seen a few running in aus, mainly they where stuck to old fairly standard engines and still made 100 bananas. My engine is speced to get the most out of it.

When its on the road, I don't mind a few people having a quick ride or maybe even a drive in mine. Then people will have direct experience to compare to a turbo engine and we can have a proper debate

I drive a modern turboed car everyday, i still catch it off boost from time to time...

One of the things I liked about graham's car was that it drove like a modern car. No lag, it just pulled when you stuck your foot down.

I'll take you up on that will. Happy for you to try mine if you like. That's assuming you can stand being in something that is made of metal and looks like a mini

Is it just me that actually enjoyed the laggyness of a turbo?

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

in relation to the stick foot down get boost; my T2 was instant. That with a 9.1:1 comp ratio was a dream to drive. I never saw the torque curve of it but its probably the nicest power/torque car i've driven around town and when you wanted to put your foot down there was plenty of power there to light up the wheels.

that being said i've never been in a supercharged mini nor do i really ever have the desire to :/ mainly driven from issues a friend of mine has had with his eaton supercharged lupo and air temps.

Im not on about the eatons, they are pretty hopeless.

So you want a Mini that drives like a diesel :(

If there's no power when you put your foot down, then you are in the wrong gear.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Will says it well.

Im sure in years gone by people said turbo engines don't fit - along came bulkhead boxes and mirage etc. Then there are all the reliability issues we are all aware of that have been developed and over come over the years.

I plan to play with gay superchargers in future, maybe see if I can get something that works well. It will never make the power of a turboed engine, but that's not necessarily the aim. Im just going to have a bit of fun doing something different. If people don't agree or want to do other things, its no skin of my nose and I won't be getting emotional about it.

wouldnt a high comp engine say 11:1 Cr running a tiny turbo at a max of 7psi give about the same performance as a supercharger? (i imagine itll have a shit load more torque than bhp) just a theory?? has anyone done this?

Edited by Johnny on 2nd Oct, 2012.

Andy,

In about 3 mounths you can have a drive in my SC12 with the carb on the right side. you'll just have to fly down here first.:)

1978 Clubman (soon to be S)
2011 Countryman Cooper

I'll just run that by the wife... lol

I have driven both.

t2 turbo & a sc12 car

the t2 was awesome pull your face off when it hits boost and it pulled very nice till then was about 9.4.1 comp, but the low down grunt of the sc12 was great.

smooth & modern felt like a big 2l engine.

im happy with my choice, im after about 100atw anything more im happy.

if i wanted 150 & up i would go a turbo.

supercharged cars are nice to drive.

the eatons are shit imo, that sprintex blower is good.
just wait and see what power mine does i guess.

On 2nd Oct, 2012 apbellamy said:
Mine should be good for a fair chunk over 100 bananas and it should pull all the way round to at least 6k+. Also the efi will help me get the best out of it. Fine for a road car.

Has anybody except graham driven a car with an sc12 pooper charger? I've seen a few running in aus, mainly they where stuck to old fairly standard engines and still made 100 bananas. My engine is speced to get the most out of it.

When its on the road, I don't mind a few people having a quick ride or maybe even a drive in mine. Then people will have direct experience to compare to a turbo engine and we can have a proper debate

I drive a modern turboed car everyday, i still catch it off boost from time to time...

One of the things I liked about graham's car was that it drove like a modern car. No lag, it just pulled when you stuck your foot down.

Edited by NickG on 2nd Oct, 2012.

i was reading the yellow bible yest and in it it said

I have a modern 1149cc efi turbo motor in the clio, the turbo is tiney it make 100bhp @ the flywheel but sometimes in second you will be off boost and its rubbish my old pug was far better in lower revs than the clio, i have been looking into the sc twin kam supercharger setup, boggo 1310 with 115bhp then turned to 194 with the charger on it cant be to bad can it? They have had motors to over 240bhp with the supercharger and an intercooler. To me the dyno chart looked like a big torque na motor which would be brilliant for a track and road car and possibly a drag car too, more control of the wheel spin and could use abit of gas in the mid rage for the extra kick?

Please correct me if im wrong but isnt this what most of us want big power and good driveability?

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

Turbo lag? I see boost from 1900rpm?

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Just compare those torque curves with a good turbo motor like Roberts.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I would love to come to the next TM event. So we can run them side by side. I loke the way my car drives and looks with the bonnet up.
I didnt want an intercooler spoiling the 69 look of the engine. SO I went for a solution that was a bit more 60's..

The car drive great on the motorway there is no shortage of power in 4th to pull out an overtake, in fact I swap less cogs than in my daily BM.

TM generally is about the higher end of the scale most people are pushing out mind bending power...

What can I say mine is small came in one box, I bolted it on with extreemly little knowledge and I love it. I would do it again.

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