Originally Posted by TI-IS250MT

FYI: I am designing a new flywheel and clutch for my vehicle.. The dual mass flywheel will be replaced with an aluminum lightweight one peice and the clutch will be replaced with much stronger material and spring rates and larger diameter to utilize the full face of the pressure plate... I will be contacting the forum administrator once production nears for appropriate group buy and sponsorship compliance and see what the interest level is... Good bye lightweight crap clutch and noisy two piece flywheel.... So long crappy lexus customer service

Originally Posted by TI-IS250MT

Update: Moving along with the development of the lightweight flywheel and clutch. My 2007 IS250MT has been taken apart, transmission removed, exhaust mid section, drive shaft. Everything looks as new; the car has 24k miles on it. The clutch and flywheel are now being redeveloped. The stock setup is amazingly oversized and heavy. It weighed in at 58 lbs with the clutch, pressure plate, and flywheel assembly. The stock setup has a dual mass flywheel with a lightweight under sized clutch and oversized Supra TT type pressure plate (almost identical). The flywheel is large in diameter and thick and heavy. We are looking to drop 20 pounds of rotational mass here. We are talking a second quicker maybe more in the 0-60. It will be a one piece flywheel now very similar to the supra TT. With a stage 3 dual dampened clutch capable of handling 500+ hp. It is very streetable and is dual mass so its very quiet and smooth but will hook right up. What we are doing here is literally reversing the setup. We are going from a dual mass flywheel to a single mass, and going from a lightweight clutch to a dual mass which means we maximize the weight loss and have minimum chatter with this clutch and provide a luxury sport feel the lexus should have. The flywheel makes most of the chatter noise on take off. The clutch is noisy and overheats because it is so lightweight. I feel like the spring rates are so low mine was literally slipping and could be heard audibly by flooring the car next to a wall. Anyways I will have the parts back in my vehicle in around 3 weeks so I will update you with the results. I am very excited.

Originally Posted by TI-IS250MT

I've clocked about 1,200 miles on the new clutch/flywheel setup so far. 700 of which were strictly freeway. The clutch is breaking in quite nicely. The car has gained what seems to be around a 10% increase in fuel economy. Pulls much harder on the freeway and all around; much quicker reving car now. Overall I'm pleased with the modification and the clutch feel and engagement are much improved. My 2nd gear crunch has almost completely gone away. As far as noise, the flywheel is now a one peice and I would say it is relatively as loud as the stock setup at idle. However it is much more healthy sounding, more like a 350Z sitting at idle in the cabin... The fluttering clicking sound off the line is greatly improved. I'm just going to clock some more miles and go back and give some feedback for slight tweaking before production. It feels real nice knowing I have the only solid clutch/flywheel setup in an IS250 manual around. Oh, and with this stage 3 clutch I feel like I can just launch and hook up so good at the light, you no longer feel like you're going to break the thing. Oh and 22 pounds of rotational mass was eliminated from the flywheel/clutch setup.