Stock Flywheel and 500whp?

[Spln_Hrd]

Im looking to make big numbers and am wondering if a stock flywheel is a concern at this point?

Thanks for viewing.

Tyler

 

[DGajre777]

The stock flywheel weighs about 19lbs, a lightened stock flywheel from RRE is about 14lbs, ACT flywheel is about 12 pounds (11.6 AWD, 12.3 FWD), and the Fidanza aluminum flywheel is about 8 pounds. When you lose about 11 pounds of weight going from a stock to a 8 pound aluminum flywheel, you will feel a difference. The throttle response and acceleration will be quicker since you have less rotational weight. Hell I'm running an ACT flywheel on my stock turbo 2G.

From RRE's site...
You are using less power to spin the flywheel and now have more power available to move your car down the road.

Lots of people freak out about any "theoretical" negative drivability issues with lightened flywheels. They are wrong, it's all good. They are not too light for street use, they won't break apart, they are stepped correctly for ACT and CFDF clutches, On a 80 hp honda you could go too light, but not on anything with enough power to pull the skin off pudding. You will have to compensate a little in your launching technique, a little higher launch rpm will be necessary.

 

[delta448]

Ty, -it is my opinion that a stock flywheel would be fine as long as you knew for certain that it's in perfect condition and your engine is very well balanced. Otherwise I wouldn't risk it.

Weight can become a concern as the stocker is so heavy compared to other options and if the engine is not balanced well you may have accelerated crank and bearing wear. Plus, reducing rotational mass will free up some energy usually consumed by the drivetrain. If you're building a 500hp engine, I doubt you'll be super concerned about the minimal driveability benefits of a heavier flywheel. I would recommend getting the Fidanza.

On a side note; Congrats Dee on your well deserved Wiseman tag!

 

[DGajre777]

On a side note; Congrats Dee on your well deserved Wiseman tag!

Thank you!

 

[Spln_Hrd]

My rotating assembly is getting balanced monday and planned to use stock flywheel. So its going to be balanced for that flywheel.

Thanks for quick response.

 

[LaN-]

but why? What are you accomplishing by having the stock flywheel?

Your just losing power.

I don't want to come across as i'm bashing your idea, but i'm tryin to figure out what the purpose is.

If you've got 500whp you've obviously got the money to buy a 300 dollar flywheel.

 

[15psi88]

I don't see what wouldn't be alright about it. Also, I don't understand why you would have a 500 horsepower car with a stock flywheel? Unless there is something you have to prove, or you bought it that way I'd just get one.

 

[Spln_Hrd]

Oops.

 

[Spln_Hrd]

I felt like the stock flywheel would hold up better, longer. Not sure if that is the case. If someone told me the fidanza would be more reliable than a stock flywheel than I want one. I got A/C, subs, Just put in leather seats and on track day they will still be in there. If i lose 15 whp over stocker so be it, not trying to run down shep just a 10 sec timeslip and if the flywheel is going to keep me in the 11's than i need to turn up the boost or spray a little nitrous in there. 300$ on a wideband seemed better. Or save the $300 for JM SMIM currently going to run stock intake because im running low on funds. I see myself spending atleast anouther 3,000 to get myself into the 10's consistently and reliably and thats if my transmission holds up.

Do you see reliability being better w/ a fidanza? That will also screw up my balancing though since balanced w/ stocker.

Thank for input guys.

 

[2gAWDTalon]

I made 550AWHP on a stock 6 bolt flywheel... it was fine. I trapped 124 on it (missing gears). I bought a Fidanza for my new setup, I just had it seriously balenced along with the rest of my bottom end. Yesterday I bought a PTT so the brand new Fidanza will be for sale.
You should be fine on the stock flywheel as I was, but at the 500whp point it is time to consider upgrading.

 

[bastarddsm]

i don't know if anyone has mentioned this but making anything over stock power on a stock flywheel is stupid. have you seen what happens when a flywheel explodes at 7000 rpm. it basically tears the car apart. if you re unlucky enough to have a passenger when this happens he or she could be killed. an sfi approved fidanzaa or act flywheel is only a couple hundred dollars. don't be stupid

 

[tkelly27]

Strength/longevity is not just about weight, but about where that weight is placed and what material is used. I've not seen anyone break an after market flywheel, but then again I've not been around for too long, and I've not seen anyone break a stocker. Searching for "broken flywheel" a few different ways comes up with a bunch of nothing. I'd look at people that are making the HP you want to make in DD cars and see what flywheels they are running.

$300 in a WBO2 is a much better investment though, you're spot on in that line of thinking.

*edit* ^ maybe not...

 

[bastarddsm]

the flywheel exploding at 7000rpm would release 50kj of energy. which is enough energy to lift the car 4 feet off the ground

 

[2gAWDTalon]

As stated above... I made 550awhp on my stock flywheel (6 bolt) and I revved it to 8500 daily, 9K at least once a day. This may have not been the best thing to do, but it worked fine.

 

[Spln_Hrd]

So an aftermarket flywheel like a fidanza or XACT is more reliable and less likely to shyt the bed at 9,000 rpms? Would you all recommend rebalancing it if down the road i go to a Lightened flywheel?