I couldn't find the info on the newer plastic engines I was hearing about, but found this:
Plastic engine - Wikipedia, the free encyclopedia

300+ HP revving up to 14,000 RPM! Pretty cool for old technology.

way to kill the thread crash ;)

That would be pretty neat. I wonder how long it can survive everything.

Hey, if they can make gun barrels out of polymers and plastics that can stand up to those explosions...anything is possible!

RCZ- Excellent explanation of the flywheel.

I actually have a phone call in to the Nissan engineers right now to get a solid, definitive answer regarding the SRM system. His initial thoughts were the same as mine and that the minor adjustment in weight would only be beneificial to the drivetrain and wouldn't hurt anything. However, the 370Z was apparently a 100% Japan project and no one from Tennessee was involved so he's going to have to check with his counterparts in Japan for confirmation.

That was 80's technology too. Today's technology? Who knows. I personally would build the connecting rods out of an aluminum/plastic alloy for extra strength, but 300+HP from a motor that weighs less than 200Lbs wet is a VERY impressive feat.

I put lightened flywheels in both my RSA and 993. In both cases I had to adjust my driving style on the street. A chip helped in both case but did not completely eliminate the stalling when abruptly coming of throttle.

I can't imagine a light weight pulley by itself would have the same effect. I do like the idea of an under-drive setup.

I am very interested in the results of the call Kyle. I have a feeling that we are just waiting to confirm that our theory is correct and the SRM system uses a pre-set continuous table of target RPM (wheel speed vs gear) to calculate and hold RPM. In this case, a lighter flywheel will actually help the system match gears faster thereby getting us a few 10ths on the track :)

Bah, great job everyone, now I want a flywheel too:shakes head:

I had a JWT flywheel on my 350. My only complaint is that it sounded awful, especially from the outside. It sounded like something was broke at times.

chatter?

The other aspect that people should be aware of is the fact that the infamous "off-throttle lurch" in first gear will get worst. If you can deal with that and the chatter/sensitivity, then this one is a key mod.

You bring up an excellent point.

The factory flywheels are a dual mass flywheel which keeps the noise down. All of the aftermarket lightweight flywheels are only single mass which has a tendency to rattle a little bit more.

Personally, I love that sound. It means that you have high performance parts on your car and you're not messing around. For example, the very first thing everyone with a Ducati does is purchase the open clutch cover. Because they run a dry clutch system you can run clutch covers that are open to the elements. It rattles away and to the lay-man sounds like something is rattling inside the engine. To those who know, you just see a little grin form on their face and the look of "yea...That sounds AWESOME!!!"

waiting to know about SRM and if changing the flywheel will effect the SRM

Ah yes beautiful sounds..like straight cut gears whining or sequential gearboxes slamming through gears..or brake squeals in the paddock..

To think I just got home from the Koni Challenge haha, never going to get tired of this...hell Im going back tomorrow for day 2.

Hey I actually met Mag from Performance Friction today, he said he used to work with your brakes department for development...

We have worked with so many different manufacturer's over the years in the pursuit of finding the best brakes that I could definitely see working with Performance Friction. They make a nice product.

An old car of mine had a great gearbox whine (like a rally car) and I really enjoyed until I got a phone call to say they forgot to put any oil in it when they replaced it...

Brake squeels and exhaust popping are my favourite :)

What's the status of testing lightened pullies [from Stillen] for the 370Z?