Ignition And Fuel Questions

[KE70+AE92]

hey

in the process of turboing a 4k

i running the stock carby which has be fitted with larger jets

I'm getting a efi fuel pump and regulator soon but i was wondering will the needle and float be able to hold the pressure

ill will be running around 6 to 8 psi of boost so that means around 8 to 10 psi for the fuel pressure

are there any other carbys out there which i can scab a needle and float off that will fit and stand the pressure

 

another question will i have to use a different spark plugs once its been turboed

I'm using bp4ey at the moment and it runs really good

with the added fuel and air will i have to change them

 

thanks

[Taz_Rx]

The small down draft (32/32 32/36 etc) needle and seat will hold up to 12'ish PSI of fuel pressure. Stock carb won't hold much over 4psi.

HOWEVER, this isn't a problem. If you use the right carby turbo rising rate regulator [Click "TAR" in my sig for pics of it] then you can reg it down to 4psi base pressure, and then it'll up itself with boost.

 

Are you also going to use a lift pump/surge tank/main pump?

 

As for spark plugs - get yourself some NGK b7es. :happy:

[KE70+AE92]

so if i get rising rate regulator i wont have to change the seat and needle

what about when its on boost and is running the higher pressure will it be able to handle it

 

i was going to get a vl external pump and use a regulator

[Taz_Rx]

When its on boost the float bowl will be getting drained.....quickly. So this higher pressure will just make sure its kept topped up with fuel. :hmm: