6 replies to this topic

[stevespi]

Hello All,

Ok im starting to prepare my standard 998cc for a supercharger and gradually building up new and old parts to carry out the conversion. Its a bit on a budget, but just something to do over the next few months.

Right the bit i need advise on at the moment is the fuel pump. Mine currently has the standard mechanical pump (nothing wrong with it at all) but the supercharger will demand more fuel than the pump can handle. So I have googled and search the forum a lot and have 2 options really.

1) Buy a solid state fuel pump, mount on the rear under the tank on the axle etc.
2) Buy a fuel tank from a SPI/MPI mini and fit.

Option 1 there are lots of threads etc, but cannot find many people or threads regarding changing the tank. Is this an easy and feasible option. How would I wire this up? Just run a cable from the ignition and ground in the boot? Is there any fitment problems with this?

So once decided on the option, is the Filter Kind Regulator the best one to go for? I'v seen some with or without gauges. Are the ones without easy to setup?

Thank You

Steve

[Big_Adam]

You're fitting a supercharger and a fuel pump tank combo befuddles you?

Well, MPi takes are bloody expensive. So what you can do is fit a pump then make a return and solder / weld it on or connect it to the low pressure side of the pump, then you don't have to faff about with welding or expensive mpi tanks.

As for pump location, the reason for low (most put it on the subframe) is to keep fuel in it, too high and it might run dry and destroy itself. Myself, I fitted mine in the boot as I wasn't sure how well it would do with the wet / grit / salt air of where I live, its never caused me any problems.

As for wiring, take a switched live from somewhere, add a relay and a fuse and maybe an isolator switch (car has a bump, it turns the pump off) and you're good to go.

[stevespi]

Fitting a supercharger is easy. I have a Ford T Bucket with a 1700 CrossFlow supercharged Block on it, which i built last summer. So the concept of the charger is easy.

Its mainly fitting the MPI tank into my mini I was unsure on. As didnt know if it fitted and anything else would cause a problem being from a later car. I understand why the pump sits below the tank especially as the Solid State pumps are push and not pull..

[Cooperman]

Just buy a pair of Facit standard pumps and pipe them in parallel inside the rear sub-frame. Run separate live feeds, one from the ignition and one from a switch, thus giving fail-safe fuel delivery. Fit a fuel pressure regulator just before the blower fuel connection and it's all done simply and reliably.
Superchargers are great and, IMHO, much better than turbo-chargers as they run cool. Remember, the Supermarine Spitfire had a supercharger and that worked fine (ask the Germans if in doubt!).

[stevespi]

Iv always prefered superchargers. Had a Corrado G60 and a Supercharged MK1 Golf, then made the mistake of owning a Series 1 MK3 RS Turbo which had no end of problems. Especially when I thought it was cool to rag the nuts off of it and then just turn it off. Did it one nice winters day after abusing it down the Motorway. Got home turned it off, next morning turned it on to hear a rather loud crack and bang to discover the turbo had cracked. Costly mistake and lessoned learned, than if you do drive a turbo hard. Fit a turbo timer.

[Cooperman]

I did some design work and calculations on a 1275 engined Frogeye Sprite with a Shorrock supercharger a while back. It is so easy to set the desired boost ratio using different sized toothed drive wheels and a toothed Fenner belt. Once done the set-up is ultra-reliable and you won't ever get temperature related failures. In fact, the only slight risk could be intake icing in extreme cold conditions.
If you Google 'Shorrock Supercharging' there is a wealth of data available.
I once drove an 850 with a Shorrock blower and the performance was as good as a 998 Cooper with superb driveability at all revs. No 'orrible 'turbo-lag' either.

[Verbaliser]

I have a supercharged stage 3 998cc mini. As far as I know the standard mechanical fuel pump is fine for up to 100 bhp which you won't get anywhere near with a standard 998.