See mod list below:

I have yet to tune my PFC on my FD3S.
And have been getting very high injector
duties at WOT..

So Should I tune my PFC with my current mods?

Or should I get/install 1300cc secondaries, then tune.

Thanks..

 

If you duty cycles are already high(nearing 90%), you need the injectors. Replacing the injectors will require tuning afterwards anyhow. Unless you own a Dyno and a wideband O2 sensor, tuning before upgrading the injectors would not only be a waste of time, but a waste of $$ IMHO.

Mike

 

Get the injectors. What fuel pump are you running?

 

injectors then tune. That's what I am going to do too

 

make sure you have an upgraded fuel pump before adding the larger injectors

Also, what psi are you running? If you are running 12-13, you might be fine with the stock injectors. You might just be running very rich. I think I would do a couple of dyno runs with a wideband before I went through the hassle and expense of upgrading the fuel system.

Of course, I know better than to contradict ErnieT, so maybe you should just get the injectors and pump!

 

How odd. I am in the same boat. My PFC was tuned by XS before I recieved it but I hit 100% Duty Cycle almost every time I wide open throttle it. I am going to order a set of 1600 Bosch Injectors and a new fuel rail from RX7Store here pretty soon and then get my car runed on a dyno with a wideband but I can't find a shop anywhere near here that knows how to tune the PFC. So I guess, injectors first then tune. That's what I thought. Anyone know of a shop in the midwest that can tune the PFC? scott