I will be swapping out my secondary injectors and upgrading to 1680's with a full kit (kg parts/rx7store kit). I would like to keep the car drivable to at least make the two hour trip to get tuned. I don't have a datalogit; is there anything simple I can do from the commander to maintain drivability? Will the car drive ok without any PFC updates?

Thanks.

 

You only have to calculate duty cycles for the primary injectors.

So all you have to do is adjust the injector size under "Setting ---> Injector", and account for any difference in injector lag.

The stock secondaries have a lag time of .77ms, so if your new injectors have a lag time of .85, you would change them both (Fr-Sc, and Rr-Sc) to +0.08ms

Your new injectors should come with a spec sheet.

Feel free to read page 26 here:
http://www.clubrx.org/media/pfc/PowerFC_FD3S.pdf

 

Changing the secondaries will not affect idle, cruise, or light acceleration.

 

^Thanks guys. Yeah, I was hoping if the car didn't drive very well I could tweak a few commander settings to make it more drivable. Hopefully it wont be bad at all... but I've never jumped to 1680's without a re-tune before so I'm not 100% sure.

 

Your going to be able to drive it the same. Secondaries only come on under boost and at higher rpm, the injector difference isn't even that big either. I wouldn't even bother changing anything in the tune except change your lag to +0.16 (that's what I use). Until you. At least.

thewird