Hi GT builders,
This thread is full of very usefull info discussing the merits of EFI and carbs, without question EFI will be beneficial to economy(super unleaded £6.08p pergallon) and ultimate flexibility, but most of us are driving or building GT40 REPLICAS of various pedigrees, trying as best we can to have as close a car to those run in the heady days of the 1960s.
EFI was never part of the GT40 programme, Carbs whether 4 barrell or quad webbbers were the norm and were catered for in the original design.
Move forward to present day,there are lots of EFI choices available, but when making your choice, check with the supplier that in service, ie in a GT40 REPLICA that the system you are buying or are being sold will allow you to access the distributor cap etc for routine or breakdown service, some throttle bodies and there associated fuel rails fit right over the top of the distributor making removal of the cap almost impossible when the engine is installed in the car.
I currently have a gt40 in build in my workshop, the customer supplied a motor prepared ready to fit prepared by a reputable engine builder as a plug and play install, sadly this has not proved to be the case and the engine will not start, no spark no, no injection, ( the EFI pump powers up and cuts out as per correct operating mode) the vehicle eletrics have been thoroughly checked out all fine.
The fault finding sequence requires the distributor cap to be removed to observe the LED trigger lights flashing when the system triggers the signals to the ECM, the cap cannot be removed in car to do this without removing or distmantling the fuel rails, if the fuel rails are disturbed and then the electrics energised we will have petrol and potential electrical spark, just the combination for a garage disaster.
Think carefully when buying /choosing your induction options, would any self respecting LE MANS winning race team manager fit his cars with a fuel system that required the system to be part distmantled just to fit say a rotor arm during a pit stop to cure a misfire???? or what are you goind to do at the roadside with a simular problem?
The cost of Throttle bodied EFI is around £6000 , that will buy at present 1000 gallons of petrol which in most 302 motored GT40s will take you 10 to 15000 miles, in a car that if a breakdown occurs it can be sorted with period tools and technology not needing the services on a computer whizz kid or that the car be distmantled to such a degree.
I think I will stick with my 4 barrel, in fact I have never driven my 40 and thought "wish I had fuel injection" .
YOU DECIDE,
cheers
John.
