Maybe I might get more responses here:

I have a 04 G35 coupe and was wondering which one do you think is the more quieter one and better?

ACT Flywheel vs. JWT flywheel

 

can't say anything about the JWT. I don't know.

I have the ACT ProLite, and it has been great for almost a year now. I like the one piece chromoly design of the ACT over the JWt design.

 

honestly, go with which ever is cheaper. they are both going to be decent quality and have about the same chatter.

 

I have the JWT and have about 40K miles on it. I do not notice much noise what so ever. I like the replaceable surface of the JWT, makes it easy and inexpensive to replace when it is time.

 

both are good units - you can save money on the JWT by just buying a Fidanza, as that is who makes the JWT flywheel

Some like the one piece design of the ACT (I prefer these), some like the 2 piece units - both work fine and both are reliable

The JWT is a bit noisier though

 

Back from the dead.. Do you guys prefer the Pro-Lite or Street ACT Flywheel? Is the ProLite approaching the stage of annoying for a Daily Driver?

 

The only real difference between the two is weight. The Street-Lite is heavier for better street use and lower idle. If you go Pro-lite there is more power to be had, but you might need to turn up your idle a bit so your car doesn't die from idling down to fast. I had to up my idle speed 85RPMS which wasn't a huge deal but unless your exhaust is deafening, you will probably not even notice.

Johann @ W1

 

Is the pro-light much harder to drive? I've honestly never had a light flywheel.. So im just curious if its too much to still keep driveability. Apart from idle.. Gear changes etc?

 

flywheel weight has nothing to do with the idle of the car - idle speed is determined by the ecu alone, and the flywheel weight has nothing to do with the vacuum signal of the car, which is the only thing that determines idle quality.

Yes a pro light requires more throttle when accelerating from a dead stop in 1 gear - other than that, it drives like stock. Quicker revs, both up and down the rpm scale vs the street light. Both are top notch units

 

I was debating the streetlite vs. prolite for awhile when I bought mine. I chose the Prolite and I have no regrets.

I drive a G35 sedan. I take the wfe and child out in the car. I drive clients in the car all day. There is nothing different with the way the car drives compared to stock.

Just get the Pro-lite....you won't regret it!