Greetings,

Any worth? Please post me some feedback about your aluminium lightweight flywheel. Do you saw some difference in acceleration and top end???

Thanks
Serge

 

How much horsepower is freed with the light flywheel? on a stock engine, and how much time could be shave off 1/4 mile times aproximate?

 

Yes, I must agree with the Rikkiman.

 

I have a SR motorsports 9.5 lb flywheel. I think it was one of my best mods. I highly reccomend it.

 

did any of you have to change your driving much after getting it (pulling out and idle type stuff?

 

is it not good for 1/4? Why not?

 

This has been discussed a couple of times in the last few months. A light flywheel has less inertia. This takes less horsepower to spin and accelerate. It also takes less power to slow it down. So off the line, you'll have less inertia keeping the rpm's up and you may bog while drag racing. Once moving, you will have more hp since it takes less power to accelerate the flywheel.

It's been the biggest bang for the buck mod for me yet. It does take some practice moving the car from a stop and I wouldn't recommend it in a hilly area. Tends to make my car stall with the air cond comes on at idle. Once moving, the car definately has more spunk and spools up power faster.

Just keep the rpm up when drag racing. The only thing I've heard that it'll make you inconsistent on your 0-60'. On the track, auto-cross, daily driving it is a great mod.

 

Do you guys think it is silly to upgrade the flywheel w/o doing the clutch at the same time?
I only have 30k miles on the car and worry that its gonna be awhile before me clutch needs to be replaced as i put so few miles on my car anually.

 

If you are going to change out the flywheel, you have to change at least teh clutch disk. You need a good mounting surface for the material to bed in well. Similar ot brake pads and new rotors. I hope you have an upgraded clutch as well. 30,000 miles isn't 'young' on a clutch IMHO.

Danny

 

really...I have the stock clutch.

Any combos (clutch / flywheel) suggested....i like the rb light weight flywheel? Well i just like rb.
Btw, i like to run the 1/4 sometimes.

 

also why are you guys calling it the best bang for the buck mod...this thing costs $400-500 and with the install can cost you close to $1000

 

crap, i can never get out all my thoughts in one post.

 

I cost me closer to $400 and I was already in the trans fixing 5th gear. I went with a new stock clutch at the same time. I wanted to go one step at a time and have smooth engagement since I was losing intertia. No problems with the stock clutch (stock is what RB recommended below 400 hp) in 2 years and I did take a few drag runs with it. I only got bogging if I lost wheel spin. For $400+, I got more performance out of this than the downpipe. For $1000, I might go with an aftermarket ECU or something else. But the flywheel is good for 25-35+ hp depending on the gear.

 

a flywheel can not develop hp ,it can let the motor rev quickly which feels like more hp.

 

That is not correct. The engine must spend energy to rotate the flywheel. A lighter flywheel or one with more of the mass towards the center will require less energy to rotate. The effect is more hp to the wheels. Max Cooper did some research and calculated that you will get around 50 more hp to the wheels in 1st gear, around 16 in 2nd gear, and neglible in the higher gears. It does not "feel" like more hp, it allows more horsepower to the wheels -- less drivelines loss.

http://www.maxcooper.com/rx7/parts_i...heel/index.htm

 

A light flywheel does not "take away power" it only delays the onset. It's not like the flywheel converts the "lost power" to heat or anything.
In effect a light flywheel reduces the rise time of power delivery, the draw back being that it also reduces driveline damping - the car will buck easier when starting out or misfiring.

 

The flywheel does not make or take horsepower, as several people have suggested. Your test was done on a Dynojet, was it not? This test accelerates a given INERTIA. Your car is always accelerating on the Dynojet, hence the lighter flywheel allows more torque to be used to accelerate the rollers. You will feel this when ACCELERATING hence it feels like you have more horsepower when driving. It can't make horsepower, because it has nothing to do with getting more fuel and air into your engine.

 

The only thing that matters is RW horsepower. A lighter flywheel will give you more RW horsepower.

 

I don't know if I've ever seen a before/after dyno with a lightened flywheel but from what I've learned and experienced, you don't gain any peak hp. In other words you won't go from 350 rwhp to 360 rwhp with the addition of a flywheel. But the car gets it's power at an earlier rpm. My FD revved like a motorcycle and feltmore nimble when dropping gears. Like earlier stated, 1st and 2nd gears are very noticeable and the upper gears are negligible. It's definitely worth it for a street car since a lot of street races start from 10-40 mph roll-ons where a flywheel shines. Although it doesn't get you peak up up top, it gets you more hp throughout the powerband and earlier which is IMO the best mod for the FD besides a turbo upgrade

 

Your engine puts out "x" amount of horsepower. In order to turn everything between the engine and the ground, some of this horsepower is being used. A lightened flywheel will reduce the loss of power between the engine and the wheels.

 

think about this. A light flywheel has similar, abet more drastic, effects as getting lighter wheels,at least when the clutch is out. so essentially some of you guys are saying that by getting lighter wheels, you could increase hp??
I disagree.
it has nothing to do with the amount of power created by the engine. where is this extra hp coming from?

I agree, you decrease rotational weight so the driveline can accelerate faster. This might appear as more hp on the dynojet because it uses the rate of change of velocity, or acceleration, to determine the amount of power. I think this is right, but i am not studied up on my dyno engineering.

just my $.02

anyway, I have a 9lb flywheel and my idle quality significantly decreased. however, other than that, I would recommend installing one. 1st doesn't last long now!

 

the flywheel doesn't really use and power, it simply stores it.

 

It takes a lot of power to accelerate the flywheel from one RPM to a higher RPM quickly. The amount of HP required goes up as the rotational inertia (related to the weight) and the speed at which you accelerate it. First gear goes by quickly, so it takes more power to accelerate the flywheel in first gear than it does in a higher gear.

-Max