is there a big diference between Gruppe-S Light Weight Flywheel and ACT StreetLite Flywheel??

 

Gruppe-S:
These flywheels are forged in order to ensure complete durability and reliability and weigh 10.5 lbs. All applications were carefully designed, tested, and forgings are CNC machined to precision. The end result is a high quality flywheel that is brought direct from the factory to the consumer thus reducing cost. We are pleased to offer this flywheel with our clutch packages.

ACT:
ACT Streetlite XACT Flywheel
Streetlite / 13.1 lbs.

- Preferred for Street and Drag Racing
- Improved throttle response and acceleration
- Considerably lighter than stock
- Most durable flywheel available
- Good drivability

 

While ours may look similar to others on the market, our flywheels are designed and drawn to our specs in house by our engineers. In addition they are designed to be thicker in areas compared to others on the market to resist cracking and warping.

To add to the information posted above we offer 2 flywheels for the Evo, a Streetlite at 13.1 lbs and the Prolite at 10.1 lbs.

http://www.advancedclutch.com/produc...x?prod_id=1258

Both flywheels offer the Evo owner a choice of weights for the intended use of the car.

 

i heard that its better not to put a light flywheel on turbo cars!!
what is the perfect weight for flywheel for street driving and ofcourse a couple of drags??

 

I'm not sure why anyone would say that to you, because it does not make sense. In our experience most cars can benefit from a lightened flywheel whether the car is normally aspirated or turbocharged.

For your intended use we recommend the heavier of our 2 flywheels, the Streetlite because the added weight over the Prolite will make it easier to launch the car although there are those out there that use our Prolite and have no complaints. Please click on the link I provided in my previous post for more information on our flywheels.

 

i have the prolight on my integra and i love it
but i fell hesitant about geting one for the evo because i heard ppl with light flywheels get a **** load of noise expically deceleration noise. i also road in evos with light weight flywheels and there is a really bar decell/rattle noice.

any comments on that?

 

i have the prolite..yes there is more noise..yes the revs fall off quickly(shift faster)...launching i dont really notice a diffrence...the stock flywheel is light already at 13 lbs..so the streetlite isnt going to be any diffrent...the prolite isnt really a big diff...

 

So the ACT StreetLite flywheel isn't any lighter than stock

 

i believe its 13.5 stock

 

Our flywheel has weight removed from the outside but it weighs about the same as the factory flywheel. Because the weight is removed from the outside the rpms climb quicker than the OE unit. In addition, ours is thicker and less likely to warp as quickly as the factory piece.

 

i'm conserned about the noise
will there be any horiable decel noise from your prolight flywheel

 

Whether you hear the noise will vary by car along with the modifications you've made to the car. The noise is caused by torsional vibration, not the flywheel. If you changed to our lightened flywheel or any other and the noise occured it was likely present before the change but became magnified because their is less weight on the flywheel to dampen the noise. The vibration can be magnified by the addition of cams etc. My Evo IX started experiencing noise after the installation of a set of cams with the stock clutch and flywheel. It also becomes louder at idle with the A/C turned on in my particular instance. I've drive quite a few Evo's with our Prolite that make no noise.

The following describes how different drivetrain parts can cause some of the noises you may hear. It was written by Dirk in response to a thread on here about clutch noise but the information is still realtive.

"Flywheel: It just spins at engine speed and can't make noise unless it is rubbing against something. Of course a lighter flywheel does allow more torsional vibrations to get though to the disc and untimately the transmission which is usually the noise you hear. If the flywheel was not tightened adequately, then there is also a chance to get a noise on or off throttle from the torsional vibrations of the flywheel rattling on the bolts. If that is the case, fix it quick or you will be buying a new crankshaft and flywheel!

Pressure plate: It just spins along with the flywheel. It also functions up and down. There is no noise associated with it either unless it hits something which also would be consistent. If the relase bearing came partially detached, you will get a noise and vibration when you press the clutch pedal. Shifting becomes difficult too.

Clutch Disc: It only spins when the clutch is engaged. The disc doesn't really make noise itself, but it allows the engine's torsional vibrations to transmit to the transmission. Much of these vibrations are dampened out by the springs in the disc's center, but with different spring rates, more vibrations can pass though which means more noise, especially at idle, high gear coast and decel.

My guess is that it is probably the difference in having a stronger disc, but I am only giving a keyboard diagnosis. I don't presume to know the whole situation. If it happens to be that your flywheel is not tight enough, that is a serious issue that should be dealt with immediately. We get very few complaints about noise with the EVO, especially an 03. Most come from people running our solid race discs but that is understandable and we get some complaints from people who have the EVO 9 or other later models that originally have the really weak springs in the disc center.

Keep in mind that lighter flywheels, hot cams, more boost, aftermarket pulleys, etc all cause increased torsional vibration which means more transmission noises. Obviously I am not there to hear the noise you are encountering so I don't know if it is a normal noise or not. Please feel free to contact me directly for more information.
__________________
Dirk Starksen
President/CTO
Advanced Clutch Technology Inc. "

Please let me know if you have anymore questions

 

I have the pro-lite and you can hear it but I can live with it.. if your accelerating you wont hear it but at idle you can hear it spinning

I have a question for ACT how long do the pro-lite last? can you resurface the flywheel?

 

The Prolite should last just as long as the OE if not longer because it was designed to be thicker than the OE unit to resist warping. It can also be resurfaced just as you would the OE flywheel. How many times would depend on how bad it was warped and how much it needs to be machined. The best bet as always is to have it examined by a reputable machine shop.

 

I'd like to know the same thing