Off Topic 750 Formula

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Off Topic 750 Formula

Graham Templeman

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Hi.
I am a member of the 750 Motor Club and we currently use the 1108 FIAT engine to power our 750 Formula racing cars.
The engines are in fairly standard trim to keep costs down and reliability up and with a mandated cam to even out performance. Tuning is restricted to balancing the engine, lightening the flywheel and skimming the head. Induction is restricted to one carburettor choke while the exhaust system is free. All this gives a power output of around 95-100 bhp and a nice wide power band, which, combined with the light chassis weight, gives average lap speeds of 85-95mph, making the cars a second or so off the BTCC lap times at most circuits.
Some of us are currently proposing the use of fuel injection and I am looking at what issues we might have by simply lifting the standard ECU and using either single point or multipoint injection and fitting it to the car. We would presumably need to use some of the standard sensors such as the Lambda (O2) sensor and various temperature sensors but I was not sure about the extent to which we can get round the immobiliser and other (as yet unknown) problems.
The idea would be to get an engine running on a Dyno so that we can see the sort of power that we would be dealing with. In honesty, we would be looking not to increase performance, but to maintain it at around the current levels but using modern technology and providing something that is easier to set up. The alternative would be to use an aftermarket ECU such as Omex or Emerald.
Any comments, suggestions or ideas?
Graham Templeman
 
Hi, and welcome,

so are you looking at the later SPI..?
of the more modern MPI??

the Immob is simple,
it's the level of sensors required to make MPI work WELL that will need the input of a more experienced person..

I was a tad confused my the thread title - as I thought it referred to a 4 cylinder panda..

Charlie - Oxford
 
Well all the sensors are already there, so building it back to spi would be easy. Problem would be the ecu which only has tables up to 6200( or6800) rpm.

You could make a separate loom for the dyno which has a own power source.
 
On the other hand, dead easy to do.

The SPi will fit the standard heads and has a stand alone engine loom.

Omex (or megasquirt if price is an issue) box of tricks, and robert is your fathers brother.

If you specify the same ECU for everyone it will be easy for the scroots to plug in and check that nothing funny is being done.

There are throttle body size options so they can be tested on the dyno to give the best power/price compromise.

Cheers

D
 
The Polestar mapable ignition ECU is popular with a lot of 750MC racers so could you not use the Polestar ignition/injection Ecu?
 
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