roarinrotaryrx7

iTrader: (8)

Been digging for a few days but haven't found solid confirmation on if this setup is possible. Maybe someone can shed some insight on this... I'd like to upgrade from the current 215mm setup on my '82 engine to a 225mm aluminum flywheel, clutch and pressure plate. In order to do this do I just require the 79-82 counterweight to match the heavier rotors? Or is this entirely not possible?

project7s

iTrader: (5)

If I'm understanding you correctly you still have the factory 82 heavy flywheel on the car now. If so then yes, buy the counter weight for your engine so it matches your rotors.

Then buy the 225mm aluminum flywheel and clutch set.
Just remember that size years down the road you need a clutch for an 83-85 car now.

roarinrotaryrx7

iTrader: (8)

Yes, I currently have the stock '82 flywheel. So my parts purchase list would be...

225mm 83-92 N/A Rx7 Racing Beat Lightweight Aluminum Flywheel
225mm 83-92 Street/Strip HD Clutch Disc 12A & 13B Non-Turbo
225mm 83-92 Exedy Street/Strip Pressure Plate 12A & 13B Non-Turbo
79-82 Rx7 Rear Counterweight (1883-11-751)

Does that sound correct?

7krayziboi

iTrader: (15)

I heard/read not too good things about aluminium flywheel...i don't mean anything, just saying .

diabolical1

iTrader: (3)

like what?

t_g_farrell

iTrader: (1)

So you already have the lightest stock flywheel made for 12As at 23lbs. Going to the ultralight AL
flywheel will be a big change. Jeff20B has some great opinions on why you wouldn't want to do this.
Maybe he will chime in with his experience with the AL vs the steel light flywheels.

roarinrotaryrx7

iTrader: (8)

That's so funny, I reached out to him before I posted this and he's given me some pretty awesome feedback. I guess what I should have mentioned is that overall I just reall wanted to confirm that I could swap 225mm components to a 215mm engine. Gonna end up going with the lightweight steel flywheel I think and an Exedy Stage 1 kit. This isn't a stock motor but it isn't making ridiculous power, I just want to liven it up a bit and have a bit more bit on the clutch.

j9fd3s

iTrader: (3)

for the flywheel weight, the happy spot has something to do with the weight of the car, and the intended use, and the driver. it makes it hard to have an absolute, but we can offer some guidelines.

here are a few examples. all of which are IMO, BTW, so YMMV!

stock 79-80 Rx7, 30lbs flywheel in a 2380lbs car, and the flywheel is just way too heavy, its hard to drive the car in some ways because the flywheel is so heavy.
stock 81-82 Rx7, 23lbs flywheel in a 2330lbs car. this combo is ok, flywheel is still a little heavy, but it isn't distracting.
stock GSL-SE, 26? lbs flywheel in a 2550lbs car. its ok, but flywheel is too big
stock GSL-SE with light steel flywheel, 2550lbs car. this is what it should have had from the factory, still easy to drive, but it feels like you aren't towing a boat anymore.
stock GSL-SE with AL flywheel, 2550lbs car. too light. its a little tricky to drive, and the idle control over reacts. the steel one is better on the street.

82 race car, 2100lbs, AL flywheel. this combo feels like a gsl-se with a steel flywheel, its totally fine on the street, and really kind of feels stockish.

88 turbo, 2880lbs, 28lbs flywheel. feels like you're towing a boat, its a BIG boat too. car stays parked 90% of the time, no fun to drive.
88 turbo 2880lbs steel flywheel. this is what it should have from the factory, boat feels a lot smaller, you'd probably drive it and plan on doing the exhaust, this improves response to the point where the car is actually fun.

82FanTC

iTrader: (9)

when I put the RB AL flywheel into my '82, I hardly noticed any difference at all. I think the lightweight steel would be a complete waste of money considering the minor difference switching to the aluminum.

The car is definitely more reactive. If I punch it from a 2500 RPM roll in first gear I can break the tires loose. Never could do that before

project7s

iTrader: (5)

Yes that list sounds correct.
Also I only use the aluminum flywheel, I have one on a gslse half bridge with racing beat Holley, and it's really easy to drive, it feels barely lighter than stock.
And I also used aluminum one on an 80 stock port 12a with racing beat Holley, again was nice and smooth had no problems.
But I also depends on if you can drive a stick normally our not, I've drove one every day for the past 10 years so it comes natural, my girlfriend on the other hand hates driving it but she's ok driving a stock stick car.
Hopefully this helps.