As above. I've built the engine primarily for drag racing although it'll be street driven also and should be making 300 - 320hp. Max rpm will be 10,500. Throttle body is a 50mm TWM item with 4 injector pockets and ECU is an older Haltech fuel only.

I can get 4 x 625cc Siemens injectors but I'm not sure if they'll be large enough for the expected hp and rpm. This is my first injected pp so I'm a little unsure on injector sizing and don't want to go too big if I don't need to.

Can anyone help?

 

I've made over 270 rwhp on a13b PP using 4X720cc Sieman injectors on 93 octane using a Haltech E6k ecu.

 

Impressive! I'd be happy with that!! Did your injectors have much left in them or were they close to maxing out?

 

you using home made housings or the mazda ones?
matt