What is the difference between the 1990s 2nd gens and the earlier first gens that gives an extra 20 HP out of the factory?

What can be done to an 86 to put it more in spec with a later rx-7?

 

Not sure exactly what your asking, but I'll try to respond.

The rx-7s are broken down into the following years in the USA:

7x-85 - First Generation - FB3S
86-92 - Second Generation FC3S
93-95 - Third Generation - FD3S

Within the second generation, the 86-88 years had less Horsepower, a bit longer engine life, and some other differences including lower compression rotors. The 89-92 years had a bit more horsepower, higher compression (lighter weight) rotors, and more boost as well.

Now when it comes to the engines, the 13B engine actually spans 85-92. Many people (including my neighbor) loves to race the 1995 FB3S 13B RX-7 (Generation 1) because it handles more horsepower and is 900 pounds lighter than the second generation.

The Second Generation Turbo II cars can abosolutly compete agains the third generation ones. The 13B motor is good to about 450 reliable Horsepower (and beyond). The 20B motor (3 rotor) is good to about 650 reliable horsepower (and beyond).

All of the 2nd generation Turbos can put down lots of horsepower. The NA (naturally aspirated) rx-7s can get up to 250+ horsepower with the bolt-on superchargers, minor turbos, street port, larger fuel injectors, and possibly an aftermarket engine mangement system.

 

Are you saying thats all it can get? A fully built N/A race motor can make as much as 330 hp. Mine makes in the 225 range if not more with no forced induction. And its extremely streetable.

In fact a friend from work has a 6 port turbo setup that puts 335 hp to the ground.

Maybe you had different intentions with this post, but really, give the 6 port more credit.

 

Oh yeah, there are several differences between the 86-88 and 89-92.

A couple of the most major are:

1. Lighter higher compression rotors
2. 6-th ports are on the intake, not the exhaust
3. different intake manifold- see #2

Look at my sig. to see what you can do to make up the extra HP.

 

yeah that's basically what I was asking. It was all covered.

thank you!

 

I was going for reliable. Besides a full turbo setup for an NA, how much reliable HP can you make with a streetport (and keep good streetability)? That's using a minor turbo (8psi max) or supercharger?

Remember were talking streetability here not racing.

 

Hey RX7nCRX, you are the only person I know that has that Weapon R intake. Is it a tubular design or a filter and adapter design. Funny, my roomate has an 89 CRX HF with a JDM B16A with LSD, and he's getting a Greddy Turbo kit w/ intercooler sometime before X-Mas. Cool....

 

either a) there is so many typo's in there that it reads totaly crap, or you know shitall, one or the other

 

Easy now

There were some mistakes in his writting but no need to jump on him for it. It is always hard to answer questions like that. The fact of the matter is that horsepower on any car is limited only to imagination and physics. Is it possible to make an n/a produce 300-350+ horsepower? sure it is but it will take a ton of time and money for the average person. With that said making a TII produce that kind of horsepower is not an easy job either.

 

Well lay the smack down and tell us how it should be. If you da' man HWO.