Hello all the experts out there,

I've recently upgraded my injectors to 550, haven't fire it up yet as i am waiting for my OBD2->OBD1 clips for my injectors. So i was preparing my map, i went to Parameters -> Fuel Trim. I left my stock injector size to 240cc and i updated the current injector size to 550.

However, looking at the fuel map again, none of the value changed, the percentage still remain exactly the same as before. I am wondering, do i need to manually scale down all the cell in the table??

Thank you in advance.

 

The fuel values on the fuel maps won't change, the injector multiplier will change.

You can't simply throw in a set of 550cc injectors and enter a new injector size and expect the tune to be spot on. You need to use a wideband oxygen sensor to monitor the air fuel ratios to ensure they are on target. I recommend using the overall fuel trim to make adjustments if the v/e curve is the same.