Yeah! On my way to Big Bear tomorrow, I'm dropping my car off at Perf Nissan in Duarte nd they're going to install the JWT clutch/flywheel combo. How much of a difference do you think I'll feel and when will I feel the dif? You think my 1/4 mile times will come down with the lightened flywheel? Thanks for your info/opinions.

 

I'm anxious to hear your opinions on the drivablity, additional noise (if any) and the faster revs.

 

let us know how it goes.

 

Well, I got my car back today and I'm happy with the combo...BUT....I would like to know from someone who owns this combo if it should rattle at idle...cuz my does.

 

I have the JWT combo installed. Mine only rattles (sounds like a cement mixer) at idle very infrequently. Maybe once a week--but I'm not sure what causes it to do so sometimes but not other times. Maybe temperature?

Anyway, the rattle sound should immediately go away if you push in the clutch and it should happen less often if you are in a low gear. Also, my Vortech was always quite a bit louder at idle than the flywheel. Is that your experience?

--Steve

 

The mod looks very appealing.

Would you say it is worth $1K installed?

I might just get one too.
Tony

 

Yeah, mine rattles at idle all the time. And, it sounds/feels a little like cement mixing when in gear going from one gear to the next. However, WOW...the performance is amazing. 5th sicks a little for me, but I'm hoping that loosens up over time. I left for work earlier than normal this morning and was fortunate to miss a lot of traffic and was able to open her up...MY GOSH...it's night and day.

My score for this mod so far:

Performance: 10

Sound of car at idle: 5

-Randy

 

Def worth it...but see comment above regarding sound.

 

Chances are you'll be slower in the 1/4 mile with a lightened flywheel because your motor will be far more prone to bogging on a launch because the motor has less rotational inertia. It will be harder to come off the line smoothly and effectively. Many drag racers add heavier flywheels to increase launch because elapsed time (ET) is all about how hard you get off the line and accelerate in the 1st 300' or so. Lightened flywheels are ideal for high rpm driving where a launch doesn't determine the outcome of a race. Auto-X and road course racing cars are suite to lightened flywheels. The main advantage of the lightened flywheel is on gear changes because the rpms won't drop as rapidly therefore clutch engagement is better on high rpm shifts and the chassis doesn't get as upset (ie diving, pitching)

 

Wait, I thought lightened flywheels over the stock flywheel will be able to drop revs down faster in between gear changes. Less rotational mass of the lightened flywheel means it takes less time for it to slow down. So that means a lighter flywheel is advantageous in that you can shift quicker and not have to pause as much in between shifts for the revs to come down. Correct me if I'm wrong here.

 

During gear changes I suppose there is some give and take between 2 factors: faster engine revving due to moving less rotational mass vs. the intertia of a flywheel that is already spinning fast (which maintains some of the stored energy that the engine has already developed).