I entered my new injector size which is 450cc change my displacement, and change the adjusted multiplier. but when i reopen the fuel tool to change the multiplier it shows me a different injector size than the one i entered, like 384cc. can someone explain? thanks

 

This is because you are probably playing with fuel pressure/engine size variables at the same time. Only change the fuel injector size.

 

Just enter the new injector flow rate hit ok...you'll see the change. I've never had crome show the applied injector size when reopening that window. Just do it once, apply the change, and tune from there.

It's not really that critical if your going to be tuning directly from the start, as you can make immediate adjustments.

 

ok just wanted to make sure nothin was wrong b4 i start the motor. thanks

 

No...just be sure to run a wideband and make the changes necessary. As soon as you get it stabilized at idle, you'll get a feel for what it's going to generally need in part throttle, then from there in full. Step at a time and just go through it until your safe.

 

Im a lil worried cuz this is my first tune ever and its a fresh lsvtec. I have a wideband and g-tech, so i shoudl do ight. would it be wise to put the stock injectors in it just to brake it in then mess with the new injector later? I read tons of articles and books on efi tuning but never put it to the test.