hey i have a 93 FD with a single turbo 18psi, Prospec-B Type ll and minor other upgrades. im trying to reach 10 second qtr. what do you think about these upgrades?

ACT 6 Puck Sprung Hub Clutch 93+ RX-7 Turbo 599.99
ACT Streetlite Flywheel 93+ RX-7 225.00
Apexi Power FC + Commander 975.00
Agency Power Manual Boost Controller 89.00
B&M Style Short Shifter 93+ RX-7 69.00
CJ Motorsports FD RX7 Stage 1 Fuel System (W/ Injectors + FPR) 1050.00
HKS Twin Power Ignition 93+ RX-7 /w harness 415.00
Brembo Big Brake Kit 93+ RX-7 2,900.00

all prices pulled from rx7store.com.

 

wait, you are running 18psi on the stock computer with an aftermarket turbo you can't identify? you want to buy a manual boost controller but you already have a Greddy Profec EBC?

it sounds like you bought this car already heavily modified and you know nothing about it

 

you dont need to spend all that money on a big brake kit if your doing 1/4 mile

 

he's going to need money to rebuild his engine though when he throws parts at a car he hasn't taken the time to learn about.

 

Im glad Im not the only one that sees issues with his question.

 

i have a precision 5031RB turbo and a AEM EMS. i was rtold i should change to a power FC and to remove the greddy profec-b electornic boost control and use a manual boost controller.

 

The only problem with the AEM EMS is that it's harder to find tuners who can tune both the EMS and an FD (do not go to a general AEM EMS tuner). There's no point in getting rid of it, it has a lot of features--including very adjustable closed-loop boost control if you know how to set it up. There is no point in getting rid of the Profec unless you use the EMS to control boost. The Profec B Spec II is considered to be one of the more difficult external EBC's to tune, but it's pretty straightforward compared to tuning boost controllers on standalones. The interface is pretty dumbed down on the Profec. You will have a lot less consistent boost on an MBC (as weather changes mostly), especially if you are trying to crank it up high enough to run 10's in the 1/4 mile.

I've written multiple articles on the Power FC. It's a decent ECU but it has a lot of quirks and limitations, especially with idle tuning (idle speed and idle mixture). If you already have an EMS you would absolutely be downgrading if you went to the Power FC. Steve Kan and some of the bigger Rx-7 tuners can tune the EMS on an FD. Hell, if you lived a bit closer to me (I'm in Raleigh) I'd take a crack at it. The biggest differences IMO is that the injector staging is controlled very differently in the software compared to the Power FC and requires more tuning. The secondaries are staged by Rpm and boost on the AEM EMS instead of by duty cycle like on the PFC.

Also, if you are trying to run 10's you will most likely need 2-step launch control. The power FC doesn't have that, the AEM EMS does (although I don't know much about using the AEM EMS for 2 step on an FD).

that turbo belongs on a 4 cylinder. The hotside is too small. I believe it's a T3/T04E 50 trim hybrid, significantly smaller than the T3 GT35's that people do run. T3 turbos are not common on Rx-7's. Your turbo is not a whole lot of an improvement over the stock twins, although I'm sure it's responsive.


The HKS twin power will get the job done, although you may want to upgrade to 2nd gen coils. What fuel system is on the car right now?

 

walbro fuel pump, synapse Fuel pressure regulator and stock injectors. thats why i was going to upgrade to 2x Bosch 1680cc and 2x 850cc primary injectors and also a half and half meth injection.

 

im deployed rite now but i would make the trip if you could help with AEM EMS.

 

you can control the meth with the EMS if you know how to set it up. for your goals it makes so much sense to keep the AEM EMS.

 

You could have just called your cousin sucka!

Anyway, I would buy stuff used, but since you just got that 90k reenlistment bonus, I guess money is no object...Haha. It looks good for the most part, but here are some things I would change/add.

-Get the RX7store.com 850cc/1680cc fuel system

-Make sure that ACT 6 puck has an Extreme pressure plate. (So you dont have to upgrade later)

-A rear end. As you know, I blew my rear end when I first started running 11's. Get either a Cobra IRS or a Kazz 1.5 way. Mine holds up fine to 9krpm drops on slicks.

-AEM A/I system. The one I have. Love it.

-They are right about the AEM ECU, while it is a good ecu, its going to be hard to find a rotary aem tuner. When the car comes back to Kauai, Ill be tuning it (if need be) Im the only rotary tuner here and I only know how to tune PFC, while I could probably figure out the AEM, Id rather play it safe and just get the PFC. You can sell the AEM on these forums.

- Datalogit

- LC-1 wideband with XD-16 gauge

- Slicks

- Axles (Might not be needed but why not)

- Roll cage

- Harness

This is almost an idential setup that my car has, cept for the turbo. Give me a ring before you actually buy anything. Goodluck and stay safe!

 

Do you intend to drive this car on the street? If so, skip the money for the BBK and spend it on a twin plate clutch.

 

Definitely lose the walbro, look into dual supra pumps.

Best of luck out there

 

yeah the AEM vs the PFC is really your call.

The AEM EMS would eliminate a lot of bullshit if you get it set up right and use it to its full potential. You won't need an extra methanol injection controller, you can sell your boost controller and get very precise and loggable boost vs rpm or vehicle speed, you won't need a separate 2 step, and you will be able to control idle more precisely. You can set the EMS to automatically change the fuel and timing curves as the A/I engages. It would save a lot of extra clutter, a lot of potential wiring and plumbing failures, and you wouldn't have a bunch of controllers that don't agree with each other in their boost of rpm readings.

BUT any tuning system is only as good as the time, knowledge, and experience put into it. If you're still in NC you can bring it to me and I'm sure we can figure it out. The question is how long it would take to tune 1 system that controls everything vs a collection of separate controllers.

As far as the turbo to go with, I'd look into the GT4094. A-spec makes a kit, contact them. Good tires and at least some minor weight reduction will make hitting your goal easier.

I was just thinking... Whoever told you to get an MBC for running 10's probably owns a DSM or a Honda.

 

Good point, if money is no object, the twin disk is a much better choice.

 

It might have been me that told him that. I dont think it said he needs to buy one, Im pretty sure that all I said was this is what I use. I now have a Profec B for my single turbo, but my el cheapo $20 ebay boost controller worked just fine running low 11's.

 

i have a wideband, and im not sure if i want to switch between PFC and AEM EMS. you think you could do it?

so far ive been able to find...

the fuel kit


KAAZ LSD 1.5 way

http://www.evasivemotorsports.com/Me..._Code=KAAZ-RX7


HKS twin plate clutch kit

http://www.rx7store.net/product_p/hk...plate%20fd.htm


RP Chromoly Racing Axles

http://www.rx7.com/store/rx7/fddrivetrain_clutch.html

 

Personally, I would go with either:

http://www.rx7store.net/product_p/exedytpfd.htm

or

http://www.rhdjapan.com/jdm-low/OS-G...D3S-RX-7-57208

 

whats the difference between them?

 

I know I can do PFC. AEM, Id have to learn.