so my injectors are wrecked and i need to buy new ones. im running a stock fd but am going to do a single turbo conversion in 3 months. therefor i want to upgrade the injector size for more fuel. i was just wondering if i could install new injectors and rails that are lets say 850 cc primarys will i still be able to drive my car and will the 850s only run the stock 550 cc amount of fuel?

 

If you just put an 850 in the primary rail your car will run pig rich. The ecu has no idea you switched injectors, you need a PFC or other ecu.

 

I would just stick with 550 primaries and go maybe 1300/1400/1600 secondaries.