I recently (today) was given the RX7 book of the development of the FC and lo and behold they put the IRS on thier test mules which were FB's. MMMMMMM, if you have the book and didn't notice it's on 123.

Now to find one of those engineers and a feather to get him to hand over the plans for how they put that in there.

The book itself only has three pics of the setup.

 

what do you meen by IRS? Is this a type of motor, turbo, or system of some type? or do you meen they put the Internal Revenue Service in a FB, because if so I don't know how it would fit either.

 

Your kidding right?

 

 

If you were a nice person you'd post up pics of this so we all can see.

 

I saw that in my book, I think I own every RX-7 book on the market except for the Austrailian guy's book which is hard to find.
Any hoooo, the IRS from the FC on a FB is possible, the pic's are not that great and leave some important details in the dark(no pun intended). I have a parts car that I would love to use as a test chassis, just need a donor FC.

 

No scanner, let me see what I can do with the trusty digi cam.

 

I am going to laugh really hard about this when I am drunk tonight!

Independent rear suspension...IRS!

 

pics are no good, sorry.

 

cool somebody pleas update my thread with some information and pics, i am still working on this project and i would really like to see how that irs setup is mounted, this thread has allot of useful information so far on custom fc irs units,

https://www.rx7club.com/1st-generation-specific-1979-1985-18/anyone-running-custom-irs-461030/

we dont need the engineer who did it, thers plenty of people on this forum who are smart enough to desing a better irs,

 

Look under your FB, or any Non Cobra Mustang, Camaro, or a pickup truck... At the rear wheels, see the axle. That's called a solid rear axle...

Now imagine going over a bump or around a hard turn. The car banks. What happens to the wheels? If the bank is severe enough, you lean the tires out on the edge and lose traction.

Look under an FC, FD, RX-8, Miata, any BMW, Toyota Supra, Nissan 240SX, 300ZX, 350Z and other newer sportscars...

They have the differential in the middle and two CV axle shafts come off from it. These allow the wheels to move up and down individually for a smoother ride as well as better traction.

Independant Rear Suspension = IRS.

Cons include that IRS is more complex and therefor is more costly and harder to engineer. You have less unsprung weight, so it may induce wheel hop on hard launches, and the entire setup with subframing and all may be heavier.

 

A friend of mine that imports alot of enfini rx7,skylines and other rhd cars from japan is trying to ship one down for me ,he told me it was only available in japan ,complete IRS 600. very hard to find could only find one .it will be here hopfully in late dec.05.i'll take pics then and post.later

 

wha? is there a pot of gold too. Why hasen't that info gotten to us sooner

 

What do you do with the imported cars after they are here. They can be driven legally here...is there something that you are holding from us?

Z

 

Mazda used 1st gens as test mules for different parts when they were developing the 2nd gen. That's why there was an IRS bolted up to one. They never produced one, not even in Japan.

 

Attually on a flat surface a solid rear provides better traction.

only on uneven terrain is IRS better.

 

My 2nd gen wheel hops like a bitch on hard launches, my 1st gen doesn't.

 

there is nothing wrong with the 1st gens 5 link setup.

If you have wheel hop... then get new bushings!

 

or springs and shops

 

what shops?

 

shocks

 

:^)

 

And why was this dug up from the dead? lol. 2nd gens have wheel hop issues, even with good springs, adjustable shocks and bushings, as mine has.

 

2nd gens, and 1st for that matter, arnt intended as drag cars, they are handleing cars....check the IMSA sticker in your rear window. Hence wheel hop if you try to drag race it, just not what it was intended for. I am not bashing anyone or anything like that, just stating something that often gets forotten about.

 

I love it when people bring threads back from the dead for a four word addition to the thread.

I especially like it when I say something dumb in the thread and I don't remember if I was joking or if I didn't actually know what IRS stood for. Maybe my brain wasn't working.