want to make sure that I get a S5 flywheel for my tranny swap.

Mike

 

I don't have the number, but my advice is that if you have the tranny out, get an ACT lightweight flywheel and an s5 auto rear counterweight. cost you like 275 for everything (if you get the counter weight used)

 

s5 na n350/351
s5 t2 n370/374

 

what do I need with a auto rear counterweight?

Mike

 

There are no part numbers on auto ctwts. ONce theyre removed from the factory box, you need a very accurate digital scale to even have a good guess at what it came from.

When you buy an aftermarket flywheel, you have to use a stock auto ctwt. They make the flywheels in 2 diameters (turbo and non) and instead of integrating weights like mazda did for each year range, they make you buy the auto ctwt so that one diameter fits many year ranges.

 

And there's the guy to get the counterweight from (if he has any left)

 

No, I dont have ANY left. I sold like 10 last month. Do the flywheel retailers not sell counterweights with their package these days or what?

 

They do... but they want 135 bucks for the CW in addition to the FW... I'm glad I told you that AFTER i bought mine from ya!!

 

A buck 35 huh. That can't be right. It's a friggen chunk of metal. M'trix has them retail for $123, and their prices are usually a bit on the high end. I'd think you could get them for <100.

For those doing a flywheel, I'd recommend srmotorsports combo package...an act clutch kit of your choosing, with flywheel and counterweight for $730 plus shipping. The clutch kit alone sells for $350+.

 

OK,
I am lost. I have an automatic S5 now. Is there a AUto counterweight on it or what? Why would I need a CWT off some other automatic?

I dont know what you guys are talking about.

 

Do you not read well, or what?

I just explained all that above. I'll try it once more, after that you're on your own.

All rotaries need a front and rear counterbalance to offset the eccentric motion of the rotors. Since some of the rotors weigh differently, there are different counterweights...they look identical, but there may be slightly more or less mass in the counterweight depending on the rotor. The front one is under the front cover and never gets screwed with.

The rear one can take 2 forms: 5speed cars had a flywheel, with the counterweight built in. You distinguish flywheels by the number stamped on the back. There are 2 diameters of flywheels for rotaries...smaller (for nonturbo) and larger (for turbo), but each of these may have different weight/balance, so there are several stock flywheels.

Automatic cars have no flywheel, but they use a flexplate...this bolts to a half-moon shaped counterweight that goes in place of the flywheel on a 5sp. As with the others there are several types of counterweight depending on year of engine, and these look identical.

Most people when they do a auto to 5sp swap, remove the auto ctwt, and install the stock 5sp flywheel relevant to their engine. Some choose to go with an aftermarket light flywheel, which requires an auto counterweight to mount to.

As a manufacturer, you'd either have the choice to do what mazda did, make several flywheels, each one weighted and balanced for a specific year application, some small and some large. Or, you could make just one small one, and one large one, and then use the auto counterweight for balance, so that just one diameter flywheel could be used on many different engines...which option do you think is simpler/cheaper/faster? That is why they do it this way. So, when using an aftermarket flywheel, you ahve to get the appropriate auto ctwt for your engine..the new flywheel bolts to that.

IF you can't understand that, no offense, but you don't need to even climb underneath your car to begin a 5sp swap.

 

OK, I understand all the explanation.
SINCE I am going to use a STOCK 5spd flywheel , then I do not need the CWT and all the info that was thrown out was not needed since I do not need a CWT.

I was asking about the stock flywheel not an aftermarket flywheel.

I am not an idiot, I was just caught off guard when the CWT was brought up since I did not ask anything about that.

no need to insult people who dont know all the things you do.

 

I never insulted you. I gave you a nudge back in the right direction. For instance:

insult: "Hey buddy, you're a dumbass for not knowing."

reality check: "hey buddy, I just explained intricate details of your question. IF you don't even understand what you're going to be doing, how can you even think of attempting to perform the work?"

Anyway, in this case, since you're already automatic, IF you were going to go with an aftermarket flywheel, you could leave your stock auto ctwt in place and bolt on the new FW. Rather than having to remove the old one and install a stock flywheel...getting that big nut off the shaft (and the weight itself, if you dont know the trick) can be a real challenge. Some people doing the swap decide the extra couple hundred bucks worth of cost is worthwhile just to save that trouble, not to mention as a modification.