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We have been performing this service for more than 20 years without a single failure.
It is an inexpensive and easy wake to wake up your Normally aspirated or Turbocharged engine.
The are no negative effects to lightening your stock flywheel unlike replacing it with an ultra-lightweight Aluminum flywheel. Most manufacturers make the stock flywheel very heavy. This makes the engine very smooth and enables it to retain energy at part throttle cruise and up long grades for better fuel economy.
An Aluminum flywheel goes completely the other direction with almost no weight. This lets the engine rev up very quickly and allows the engine to work easier due to the reduced weight spinning around on the back of the crank. This is fine as long as you are at full throttle and wide open throttle all the time like in a Road Race or Drag Race only car. As soon as you let off the gas the engine RPM drops instantly and the car slows down. In a road car this causes surging and bucking at cruise speeds and poor driveability and clutch engagement.
A lightened stock unit on the other hand gives you the best of both worlds. It is a compromise between the overly heavy OEM unit and a Too light Racing unit. You get the benefits of both with none of the bad qualities.
Turbo cars are exceptionally critical to flywheel weight. Too light a flywheel will make the car rev faster and possibly come on boost faster but that is only half the issue. When you let off the gas to shift the car will drop off of boost just as quickly causing a poor transition when you come back on the throttle.
We have found that a lightened stock unit will generally be 8-12 lbs. lighter than the original yet still give the driveability needed for street use. The Mitsubishi Starion is an extreme example of an overweight stock flywheel. They are 33-35 lbs stock. We lighten them down to 20-21 lbs with nothing but positive effects and no loss of strength or reliability.
All the weight is taken off the back side of the flywheel so the surface is still the same height and your clutch still fits and works the same. We try to remove the weight as much from the center of mass as possible and leave a ring of weight around the outside for better inertia. We keep the center hub thick for extra strength.
Examples of flywheel weights before and
Mitsubishi Starion 2.6 Turbo...35 lbs. stock / 21 lbs. lightenend
225mm 2.6 Mits flywheel can Also be Re-Drilled to accept the 240mm Heavier Duty clutch
Datsun Z car 225mm...25 lbs. stock / 16 lbs. lightenend
Datsun Z car 240mm...28 lbs. stock / 18 lbs. lightenend
BMW 2002 215mm...18 lbs. stock / 11 lbs. lightenend
BMW 2002 228mm...24 lbs. stock / 16 lbs. lightenend
Datsun 240SX KA24DE 24-25 lbs. stock / 16-17 lbs lightened
to their design we cannot lighten the Dual Mass Flywheel found on many late
model BMW's and other European cars.
**** If you have any question if we can lighten your particular model of flywheel please take a picture of the Front and Back of the unit and email it to us and we will let you know before you go to the expense and trouble of shipping it
**** We cannot estimate the finished weight of a flywheel in advance of doing the work. We will get it as light as possible without damaging the integrity of the flywheel and losing strength. Any weight we can get off the flywheel is an upgrade and bonus. There are nothing but Positive benifits from this process