RotoBst

I was looking at my rx's and I have aspirations to get one to 300hp and just leave the other one with an exhaust and maybe a flywheel.
The questions comes to this: what am I going to need to do to get 300 out of the FB. I have been researching for a bit and I'm pretty convinced that I won't be able to get that out of a 6 port 13b. I was looking at swapping in a TII motor. Even with a TII swap I would still need quite a bit of modding to get to 300
I don't really want to spend more than 6k so I was wondering. How would you guys go about it? Both of my RX's are 85 GSL-SE's

Jeezus

iTrader: (4)

PP it. or bridgeport it and add a turbo, but good luck on the seals. spending less than 6k is going to be hard, you have to get the engine to put out 300hp, a tranny/rear end to handle the power, and with all that go you really need better brakes.

FBsliderseven

iTrader: (2)

13b REW.
its probably one of the best ways to get 300+.

kevinbtz

iTrader: (4)

If you do all the work your self and get a good deal on the 13b rew drive train you might be able to do the REW swap for under 6k. It's fairly easy to get 300whp out of the stock twin turbo's but you would want to port the waste gate.

Good luck,
Kevin

Jason Guthrie

What's a 13B REW with Transmission go for about?

The 13B REW was the last RX7 motor for US right?

I read a lot about people switching from the twin turbos to bigger single turbos. Are the 13B REW's prone to one setup or another?

speedturn

iTrader: (1)

I built and race a 300 hp PP 1st gen. $6000 will do about 1/4 of the project, IF you do all the labor yourself. Every system of your 22+ year old car must be modified to support operating at those power levels reliably.

kevinbtz

iTrader: (4)

I purchased my motor, transmission, front yoke of drive shaft, wiring harness, ecu and all the sensors needed to make it run for $1500. You can remove the twins to go with a single but you will be hard pressed to be able to do a good single setup plus every thing else for under 6k. The twins can be reliably ran at around 12-13.5 and give you in the neighborhood of 300whp with a good tune. If you are not wanting to mess with the twin sequential system you can always convert it to non-sequential which will act like a single turbo.

kevinbtz

iTrader: (4)

here is a write up on the swap

https://www.rx7club.com/1st-gen-archive-71/engine-13b-rew-1st-gen-write-up-499454/

REVHED

300hp from a TII motor is not too difficult. Rebuild it with a nice port, hybridize the turbo or go aftermarket and add a decent fuel system and aftermarket ECU.

slo

iTrader: (1)

300 HP under 6k is easy, you can swap a 13b-rew in for 6k with a T2 trans and ems, and do 300 on stock turbo's

Attila the Fun

iTrader: (1)

The good news:

http://www.wankel.net/DavidLane/

Dave's car is the world's most perfect GSL-SE, and though it hasn't been dyno'd, the ol' butt dyno told me that it was faster than the 3rd gen I used to have.

The bad news: He's got way over $6000 in mods.

HIM_Tattoos

file inactive, and deleted, any chance we can get this going again??

20bdreams

i would go with a 13b 4 port bridged with a bad *** EFI throttle body set up. even without turbos you can get pretty close to that 300 mark with a really good fuel, ignition, and port job. since you wont be running boost, 2mm apexs should be fine, especially since the setup will keep you n/a it should also keep you under $6k. in america it seems like everyone thinks that the way to go fast is by boosting, almost like taking steroids and supplements is the only way to get big. for a car that small a 13b is plenty powerful. try going to an australian forum. they are really big into first gens and love the set up im talking about, they also boost if you really want to find some stuff out. www.ausrotary.com

RotoBst

Appreciate all the feedback. I was looking at a REW. I was talking to a local guy that owns a shop here in Albuquerque and he said the FB he swapped the REW into made his 3rd gen look like it was driving in reverse. I wouldnt mind going that route. I was also thinking of taking the 12a end irons and doing a nasty port job on my SE motor.

steve84GS TII

Basically,it boils down to the same result.
There are lots of ways to get 300hp,each will have its own personality and different torque delivery.No matter what engine you choose to get your 300HP.....A mild 13B-REW.....A modded 13BT.....A heavily ported N/A 13B.....your still gonna need to spend more than 6000 bucks to make the car safe/reliable.Thats why I saved the engine swap for last.I spent the first 5-6 years building up the rest of the car and fixing all the weak points.When the TII engine finally went in,the car and myself, were then ready to handle to crazy-ness of 300HP in a VERY light RWD car.
Our brakes,tires,suspension,tranny,cooling,steering... ..were designed for 100HP and are 20+ years old now.STI's and Evo's might have 300HP nowadays from the factory,but they are bigger, heavier, and way more modern.

-xlr8planet-

iTrader: (3)

I´m with this guy!

RotoBst

I suppose I am a bit ignorant on the suspension end of the game. I will go search up some drifting threads as I'm sure anything they would deem worthy for drifting would take care of my needs. Even If I were to go completely aftermarket with the suspension. I plan on doing the rebuild myself as that would be half the joy of the project. You guys think that I would hit the 6000$ mark? I have plenty of time as the 300hp goal is on my race beast and I don't have a time crunch to deal with. I was looking at an REW. Even If I were to buy a REBUILT one with new housings and around 20-40k on the rest of it, I would only be looking at like 4500. I thought 6k was fairly reasonable. It sounds to me like a REW would be the most reliable, as it wouldn't be so heavily modified.

speedturn

iTrader: (1)

I followed Steve84GS TII buildup for years on the Mazspeed website. Of those that have replied here to your thread, Steve is the one who has built a reliable 300 hp 1st gen RX-7 street car, and I have built a reliable 300 hp 1st gen RX-7 road race track car. We both know it takes many times more than $6000 AND hundreds of hours of custom labor and fabrication to produce a complete, reliable working car. As Steve has said, and as I originally said, every single system in the car must be upgraded, because the original systems are now old and undesigned to handle 300 hp reliably.

boriqua51371

just like the guys stated above . you can get 300hp out of any engine size , crap look at roberst 12a making over 600hp . now its a matter of tranfering the power to the wheels. well that would take investing and the suspension , rear end , also stopping this vehicle will be harder on stock brakes , so you would need to invest in brakes , if you are going for the power tunning will be important so a new standalone will come into place and many other mods that would get you the power. with my 12a turbo project i gave myself a 5k budget to get 300hp , well i can tell you that i double that and my car is yet to be completed. i bought a ford rear end with for racing gears and lsd that set me back about 2k , t-66 turbo 1300, twm throttle body with injectors another k , microtec lt8-s another k , complete rebuild of the motor with porting another 2k from brakes from aeromotive 600 and the list goes on and on. what i would say is enjoy doing your work and if you are married you will be divorce soon.

twinkletoes

iTrader: (17)

Do what DF did. lol...every time I see his car, man. Inspiration

kevinbtz

iTrader: (4)

Its a couple post down on the same page.

By the way I have over 30,000 miles on my setup using it as a daily driver and the usual autox/drag car. It has stock rearend on its 2nd set of axles (twisted at drag strip) and 2nd pumpkin(stock exploded within the first 5,000 miles) , other than that it has been a very reliable car.

diabolical1

iTrader: (3)

to the OP:

if 300 was my goal and $6000 was my limit, this would probably be the route i'd take. however, i do all engine work myself and any fabrication that doesn't require welding as well, so if you're not able to do that, then i suspect farming it out to someone else may drive costs above budget.

Kentetsu

In this month's edition of Grass Roots Motorsports they have a solution for you (not that I would encourage anyone to do this, but it should be mentioned as an option just the same). They used a 2nd gen, but this would also be applicable to the 1st gen.

With the cost of the car, engine, paint, and all extras the total was $1800.00 This got him a 2nd gen RX7 with a small block Chevy with over 300 hp. From what I read, the car is solid and doing well in races. Again, not what I would recommend but the guy ended up with a car with performance levels way over what you would expect for such a small investment...

steve84GS TII

Not a bad suggestion.
Although, there are many options along that line of thinking that might be more desireable to someone that isnt interested in big American iron.
Many abundant and affordable import engines can be made to produce 300HP with bolt on mods and mild work.For the rotary inexperienced,rebuilding one of these fairly conventional piston engines would be a breeze,and likely much less money than paying for a "new parts" rotary rebuild, like I did.
Single turbo MkIII Supra inline 6.
SR20DE-T Nissan turbo inline 4.
Single turbo 300ZX V-6.
Mitsubishi Conquest/Starion turbo inline 4.

Most of these engines are abundant and cheap in wrecking yards,since they come from vehicles of the mid to late 80's and tend to be ignored in favor of the technically more advanced,twin turbo engines of the early 90's.Most of those more advanced engines are based on these older breeds,often being less reliable due to their increased complexity and factory HP output.......sound like a certain rotary engine we all know?
I know if I were to go piston engined,it'd be something along these lines.I have no problem with V-8's,I have a big honk'in Olds in my Studebaker.But I always liked the high pitch shriek of an import 6 cylinder,especially in an import sportscar.

Naegleria_Fowleri

Am I the only one that things the 12A can do this job as well? Sure it may be more strenuous on the engine, but come on!

And my suggestion is a TII engine and transmission, upgraded turbo, some porting, and a lot of bank thrown into the mix.

My main concern would be suspension if I were you, and ensuring that your entire car is going to be able to handle that power long before ever making that power.