I have a few questions.

I have an AP Engineering PFC for FC3S and commander and . Right now I'm planning on installing it in two weeks or 3 weeks.

I dont have the pressure sensor yet. The are around $150 from Apexi.
is it worth getting a Apexi one or using a GM 3 bar sensor.

do I need anymore sensors? or need to change out any?

 

Use the APEXi one instead, it's a higher quality unit than the GM one, also it's a plug and play affair, with the GM one you have to cut and splice wires into the unit as well as adjust the polynomal for the map sensor instead of just choosing Option1 on the commander. You can even go about this cheaper if you're not planning to boost the car past 17psi initially, you can use a stock FD map sensor which will plug right in, and select Normal on the commander. NOTE: Hope your car is a 89-91 Turbo II because the PFC will NOT work on the 87-88 Turbo II.

 

Thanks for the information.

yes my car is 1990 Infini IV. I have a FD parts car that I can get a pressure sensor from. and I think I need to use FD air temp sensor also.

 

Correct.

 

ive got one in my car. the fd map sensor has an adapter so itll plug into the fc's clip....i think

 

So what would it take to make it work on an S4?

 

I went ahead and got the Apexi map sensor.

for the FD air temp sensor. is it the blue sensor on the bottom of the fd upper intake?

 

u betcha. clips different so ull have to figure out another way to hook them together

 

I got an old parts FD I might just cut the connector off the old harness

 

I had one installed on my fc3s on Monday. I only went down to do some work on the car yesterday and had a brief look at the map. There are few differences from the normal map you would get on the power fc for an fd3s.
But all seems to work ok.

 

cool thats good to know

 

Im going to be using new injectors that are low imp. will I need to add a resistor to the injectors?

2 720's
2 1680's

 

from reading around, looks like I need

10ohm resisters for each injector. anyone know how many watts need to be?

 

Ok going to do the install in the morning. I have the Apexi map sensor and harness. Do I need to keep the old fc pressure sensor?

 

nope......first unhook your maf sensor and throw it at a wall. then unhook the harness plug and vaccuum line, unbolt the sensor, and take that out. i dont know how exactly the apexi map sensor is, but im guessing with the harness it was an additional option for the fc pfc kit, so u should just be able to plug it into the stock harness plug. connect your vaccuum line back up and then your good to go.

 

yeah sweet it just plugged right into the old boost sensor connector.

now im working on installing the air temp sensor. I think Im going to install it on the bottom of the upper intake manifold like they are on the fd.

 

well its all installed. I decided just put the air temp sensor where the old FC once was. Car runs. cant wait to get it tuned.


when the car is cold and you start it. mine goes to 2k rpm and stays there until the water temp gets got 70c any tips on what to adjust to bring it back down? Im still running the bac valve. when the car is above 70c and you start it goes right to 750 rpm.

 

Haven't played with mine yet but will let you know towards the end of this week when I hopefully have time to tune it.

 

I think the reason mine goes to 2k until warmed up is I still have the therowax on the TB.