RX7SIGN

I am almost coming close to purchasing a Power FC with commander. My mods are exhuast and dp, will this purchase be a un-wise one considering my minimal mods. Will there be any way to gain performance when installing this with no upgraded intercooler or fuel pump. I was wondering if I could tune it with a boost controller and stock IC to maybe 12psi. And run a straight pipe (HKS hiper muffler). Oviously in the future I will purchase a intercooler, intake, and fuel pump but for now will I be able to gain any perfomance with the FC, DP, and exhuast?

wtgator69

you will probably gain a little, but I would also invest in an intake. to my knowledge you can run 12psi and a midpipe as long as you have the correct ECU modifications for fuel... which a pfc would cover, but I would upgrade that IC also if your planning on doing that. Correct me if I am wrong.

Bart

Heisenberg

iTrader: (3)

you will probably notice a little gain from the base maps that the PFC has pre-programed into it. They come pre-programmed two ways 1)base map = cold air intake, and downpipe and 2) base mod = cold-air intake, intercooler, downpipe, high flow cat, and catback exhaust. I dont think you can pick and choose though.

I installed my pfc and commander last week and compared the maps at http://opus.bloomcounty.org/~patrick/pfc/ to figure out which one i had.

jeremyb

Having a downpipe and catback exhaust does not require an aftermarket computer. Even with adding an intercooler, if you have a boost gauge and you can moniter boost creep/spike, the stock ecu may still be adequite. Though wanting to raise stock psi by 2 will NOT suit the stock ecu. This is where you will need the PFC. The PFC has 2 boost settings that are optional to your choice when installed. You can program is using a commander. The PFC comes with a base mod package programmed to suit 12 psi of boost, intercooler, intake, downpipe and catback.

Even if you just have a downpipe and exhaust. Installing the PFC will enhance performance as well as smoothen the overall operation of the car due to its more detailed "cells". So yes you will feel a difference if you buy a PFC and put it on. No, you don't need it for your future mods. Yes, you will need it if you're wanting 12 psi of boost.

Jeremy

SpeedKing

iTrader: (4)

Ding, ding, ding, we have a winner!

You can run most of the bolt-ons (intake, DP, exhaust, IC) with the stock ECU *provided* you stay @ 10 PSI and go no higher. Anything above that and an aftermarket EMS is a must. As mentioned, watch your boost gauge and when you start spiking over 10 PSI, get a boost controller to keep things in check, or spring for a PowerFC or equivalent, and invest in some good dyno tuning.

edv

Hey RX7SIGN, did you fully solve your secondary boost problem from a few months ago?
If so, what was the solution? Or did you go non-seq?

MichaelFregoe

iTrader: (1)

If you want a PFC I am selling mine. I have the unit and commander as well as 1300 secondaries for sale. I am returning my car to near stock level and no longer need it. It will however need to be re-tuned for your car. PM me if interisted. Mike

RX7SIGN

Okay, Thanks for the advice guys. I think im gonna go with my original route, IC, intake, blow off valve, etc,. Then after that raise boost, FC, and fuel pump. Oh and I did fix my boost awhile back guess you didnt catch the thread so I will give you the good news. It was a corroted coil in the ignition that was causing the boost to fall off. Also one bad check valve if I remember correctly. Car is running beautifully, and in return Ray of PF who fixed the almost year long unsolved mystery in 2 days notified me that I had a new motor replaced by Mazda recently that I was never told about before buying the car (which I probably know why but dont want to get in depth). He knows this for a fact and guesses it was done around 60,000 or so. Meaning I have roughly 12,000-14,000 miles on it. Now its just basic maintainence taking care of her, and driving her hard I heard she likes it like that. ; )

seanfd3s

You could for a bit then you risk blowing your motor, The best way I know of for running mid pipe is 1000cc or better injectors, fuel pump, ecu, and ported wastegate for the boost creep/spike. better to be safe then sorry and porting the wastegate is the best way to get rid of boost spikes and creeps which will happen with MP.

SpeedKing

iTrader: (4)

If I were you, I'd hold off on the intake. With a DP, exhaust, and IC, you should be fine on the stock ECU. The addition of an intake will usually cause boost spiking. Do you have a boost gauge, yet?

RX7SIGN

Yes I do I dont see whats the problem with a intake?

BC-FD3S

iTrader: (2)

I just tunned my PFC for 13-14 psi boost. My mod is CB, DP, Efini Y-Pipe, Blitz SMIC, HKS TwinPower and High Flow Fuel Pump. My best run turns out 275rwhp at 14psi. I kept my stock air box because I am afraid of getting boost spike since I want to use PFC to control boost.

275rwhp does feel a huge different and my torque curver is very flat from 3000 rpm all the way to redline.

BC