Brief history of my car...1994 rx7 r2...originally a show car. Dyno chart that came with the original paperwork listed about 290 rwhp, but also listed an a/f guage. a/f started at about 15 and dropped to either 10 or below.

Second owner buys car, drives it gently for 10 months, rebuilds due to an oil leak.

I buy car after about 1200 miles on new engine, drive it 300 miles home, blow a seal on the way home.

Mods are as follows...g-force cpu, greddy stock placement IC, greddy UDP system, greddy throttle body and IC piping, greddy 3.25" cat back and mid-pipe, atr tt downpipe, holley fuel pump, pettit CAI, profec-b boost controller.

At full boost, the guage reads about 15, maybe slightly above. My theory is that the car was tuned to be a show car and not daily driver. Now, is it possible for me to buy an S-AFC2 and richen things enough with the g-force cpu installed? I'd take it to rx7store and have them tune it to stoich with a WBO2. Is this at all possible with my setup, or is it necessary to upgrade to a PowerFC?

 

I think a better choice would be to go with the PowerFC now. See that it would get you better tuning ability after you get your new engine in and for future re-tuning for other mods.

 

Ok but to get it up and running for daily driving, could the s-afc2 richen it enough for the mods i have? I can invest in a PowerFC later on down the raod when i get other mods.

 

S-AFC2's do not work right on the 3rd gen! It has been said 8 million times. Work a few extra hours every week for the next month or two and get a pfc, unless of course, you enjoy blowing motors.

 

Use the Profec B to TURN DOWN the boost, and voila. Safe car.

Advice would be to sell the G-force ECU, and use that money + the money you would WASTE on the SAFC, and get a Power FC. This way you can safely tune the car to run at 15psi. The G-force ECU is pre-tuned, but you can't make any changes.

 

He has a midpipe, so there is no "turn down the boost"

 

On SOME cars, the Profec B will actually control creep. Not on all, but from the way it sounds, he is holding at or a little over 15psi. If he turns down the boost to 10 and creeps to 13-14, he's alot safer (on that ECU) than running at 15 and creeping to 17-18.

 

It's not creep then if a boost controller is fixing it. What can a boost controller do if the wastegate is already at 100%? Nada.

 

Mahjik to the rescue...again =D Ok thanks guys, sounds like the PFC is really the best way to go...even though I'll have to come up with a grand, plus tuning $$$. How long does it take to tune with a WBO2 to get stoich all around?

 

weepul,

Things like te AFC, Rising Rate Fuel Pressure Regulators and such do work to increase fuel. Those types were used before the PFC (and other tuneable ECUs) were available. While they can work, it just doesn't make sense to use them with the technology available today.

For information about the PFC and it's tuning, read/post in the PFC forum:

https://www.rx7club.com/power-fc-forum-47/

 

Ok.. Maybe I used "creep" incorrectly.

I've seen on a few cars that (overboost?) after a Profec B is installed, the boost calms down and is more controlable. This may not be the case in this car, but I was just offering some experience. It almost sounds rediculous, but it has worked.

 

Sounds like you bought a car full of parts rather than a reliable car that has been properly setup. Thats what happens when you buy a show car.

I'm sure the previous owner blew the motor just like you did - cause the car isn't tuned for the mods you are running. So if you don't wanna blow another motor, use that boost controller of yours to set boost to 10 psi and no higher and sell some of the useless mods to get a power fc. Unless of course you like blowing tons of cash on new motors.

 

Yeah that's what it seems. Not sure there's anything I'd want off of it to sell, except maybe the Sparco Clubman 4-point harness in the drivers seat. Still in great condition, whatcha think I would get for that?

Also, does it matter much if I get a used PFC/Commander? It's either that or JT-Imports. I hear they have a setup for the 2 for $1000