Rx-7_Enthusiast

I am aiming for around 350 horsies for my 7. Why 350? It just seems like a reasonable goal for reliable horsepower that can be extracted from the 7.
I would like to know if my setup is going to be reliable and also what my power figures are around so far. I know this goes hand in hand with the driver, but I will only be boosting the car once in a while. Oops forgot to mention that I am looking for fwhp not rwhp.

My car has
PFS SMIC
RSR catback
Intake

That is all so far

I plan on getting a downpipe and an apex powerfc soon...and thats all I am looking to spend on the car besides routine maintenence. I will also be getting an aluminum ast. With 350 fwhp would I need to get rid of the stock injectors? I dont want the duty cycle to be to high.

fairly safe?
Thanks for your imput fellas

3rdgensleeper

iTrader: (10)

how many lbs are you going to run?

Cgotto6

iTrader: (8)

350 on stock twins will be gnarly. You can do it, im not sure about their lifespan though. Youve got a ways to go with those mods...

Marshall

350 flywheel can be done with ease but you'll probably want a midpipe or high flow cat. You won't need bigger injectors.

rynberg

downpipe, cat-back, intake, IC, Power FC on stock motor, should get you 300 rwhp (350 bhp) at 13 psi or so. You don't need bigger injectors or fuel pump. It will be much easier to achieve 300 rwhp with a hi-flow or midpipe, as Marshall suggested.

Rx-7_Enthusiast

first off thanks guys for the input, It doesn't have to be exactly 350, somewhere around the vicinity. I will probably be running around 10psi all day everyday. A question though, how does a 350 hp feel? The fastest car ive been in so far is my friends t2 and hes putting down around 230-240 rwhp at the moment..it feels okay, its not slow, but it doesn't feel too fast either.

would this setup be relatively reliable? That is in terms of not stressing the motor much and having longevity. This car is not my dd. It is a weekend toy.

So I should expect to be around 350 with the mp, dp, power fc, smic, catback, and intake?
I will be getting an upgraded radiator as well.

DSMguywantsFD

i think you could do 350bhp with just a high flow cat (maybe even the stock cat). with a cat you wont have to port the wastegate and you might be able to pass smog if you are lucky (or at least not get your car towed by a cop).

importrx7

@ 14psi with stock twins i put down 347rwhp, with a fuel pump, ignition, intake, powerfc, fmic, 1300cc injectors, downpipe, mid pipe, and cat back.

I think you should get a fuel pump just to be safe and maybe some bigger secondaries to be safe also. A radiator is for sure a good idea period. A aftermarket ignition would help out some to.

With stock injectors at 100% duty cycle which you shouldn't run gives you 422.7 flywheel hp.

At 85% duty cycle you can get 359.3 flywheel hp, so if your looking for power around 350rwhp your going to need injectors and a fuel pump unless you really want to rebuild soon.

darkphantom

iTrader: (2)

http://www.cardomain.com/id/sexyrx
369 @15lbs

poss

iTrader: (5)

I got the exact same horsepower with basically the same mods. Looks like we know the recipe for 347rwhp.


I daily drive my car at approximately 300rwhp for 3 years and it was VERY reliable. I expect no less reliability now that I am pushing some more hp.

Julian

iTrader: (14)

Many cars use an 85% max duty cycle, Mazda was very conservative with the 60-65% for 255 FWHP

BlackR1

350 horsepower at the engine is reachable on stock twins, but you'll be close to maxing out the efficiency of the injectors, and turbos. The stock turbos are good, but running higher boost shortens their life if you're on boost all the time. With the age of the car, stock turbos are probably already showing wear.

If you want safe and reliable, you dont want to go over 85% duty cycle.

Is that you Andreck? Are you talking about Justin's FC?

OneBadFox

LS1 swap with bolts ons, and it will last over 100,000 miles and get 25+mpg.

GoodfellaFD3S

iTrader: (213)

I don't think that is the input he was looking for, genius. I **** on V8s.

rx7 enthusiast, my dad made 290 rwhp on r1 with only intake, dp, cb, pfs purple box, and profec b at 12 psi. newer reman, newer turbos, stock ic, main cat and everything else. He pulls on C5 vettes on highway runs

RX7SIGN

Do you really need engine managment if your just planning to run maybe 12 or 13psi with intercooler and intake?? I would think a electronic boost controller at 13 psi with intercooler intake dp and catback would be a nice setup, but I just dont want to spend the money on a power fc right at this moment is this possible? If not I would guess atleast the stock ecu could take 12 am i correct?

DSMguywantsFD

i think it would be safer to, if you dont want to spend money on a powerfc just get a used m2 or petit ecu, they are fairly cost effective.

Rx-7_Enthusiast

My name is Jonathan, though I am sure there are a lot of Jons with RX-7s lol. I am not talking about Justin's FC. His FC is clean though.

Dark Phantom: That is one sweet ride. I was looking for a BB R2 but those are so hard to find!

GoodfellaFD3S/Rich: I have seen you post before and I think its so cool you and your dad both have FDs! My dad refers to my fd as a kids toy. He says its quick but its still a kids toy lol.

RX7sign, I would just spend the money on the engine management to get it out of the way and be on the safe side. I would also rather spend a few hundred more for a power fc complete standalone than pickup a pettit or m2 one but thats just me. Thanks for all the help guys.

Looks like I will be getting a powerfc, dp, radiator, ast, maybe a mp, possibly 1600cc secondaries or maybe 1300s. I will probably end up getting a fuel pump as well. Hopefully after all that my dad will agree that its a respectable kids toy!

rynberg

YES. You should not run over 10 psi on the stock ecu. Period.

Enthusiast: If all you are looking for is a solid 300 rwhp, you do not need to go through the hassle/expense of upgrading your fuel system.

RX7SIGN

Okay thanks so next purchase is the IC Intake then next move is a Power FC and silinoid to control boost! I think I will be okay on stock fuel at like 13psi ; )

RE Suzuki

Shouldn't next be the power fc before anything else? I hope you don't go "kabooom".

maxcooper

A PowerFC and a tuning session with an experienced tuner will pay off big in reliability, drivability, and power. Even though you can make 300RWHP (350 flywheel) with a chipped ECU or even a piggy back, I think you'd be happier with the PowerFC and some tuning. For one thing, the car just runs a whole lot smoother with the PowerFC than it does with the stock ECU. And you can probably achieve your power goals at a lower boost level or with less add-on parts with a well tuned ECU than you could with a pre-tuned (but not tuned specifically for your unique car) solution.

I'd get:
- intake
- SMIC (your PFS IC is fine)
- cat-back (your RSR is a good choice)
- PowerFC
- downpipe
- HF cat (or stay with the stock cat for quieter operation -- avoid smelly midpipes)
- tuning!

-Max

RX7SIGN

Why would I go kaboom? Lol I dont think getting the Power Fc before IC and intake is a good purchase...agree IC Intake any other BPU's then PowerFC tuned by my buddy Ray at PFC and raise boost.

importrx7

Why you ask Detonation!!! Your intake and intercooler i think will cause the car to run a little leaner. A PFC is by far the best next purchase. There will be no more 3k rpm hestitation, and you can have your air/fuel set perfect. Tuning is everything with a rx-7!!!

`sl!mXP

I agree with importrx7 here on getting the PFC, your going to need at it one point or another if you want 350hp might as well get it now. It will let you maximize the engines efficiency and give you peace of mind (stock ecu=bad news for 350hp). Every mod you plan on doing will increase air flow and if your keeping the stock ecu and stock injectors in your keeping fuel flow static. So if you increase air flow without increasing fuel flow you lean out. It might not be by much but then again.... we all know how precise this car wants us to be

rynberg

I feel like I'm bashing my head into a wall.....or I should start.

YOU WILL NOT RUN LEAN ON THE STOCK ECU AT 10 PSI, EVEN WITH ALL THE BOLT-ONS. Period. If you want to argue with me, you can look up the past 300 threads on the topic. You will find you are wrong.

I certainly agree on getting a PFC and tuning for several reasons, but not because he's going to run lean at 10 psi with a few bolt-ins. Because it's not going to happen.