I'll be taking the car back to JoTech in Dallas for further investigation. They did a new clutch and Z1 CSC elimination kit install for me in Late June. I'll update with what they find after the appointment.

Well I have news. JoTech dug into this issue for my problem and discovered that a tooth is missing off the reluctor wheel attached to the backside of the new Z1 Lightweight Flywheel. They are going to evaluate the possiblity of welding it back on against the reliability of the welded tooth. I asked them if a new flywheel is needed, and they have not gotten back to me on that question. I'm sure Z1 will want to know that one of their flywheels had a failure of this type. Maybe they'll even cover the failure with a new one. Fingers crossed on that one.

I'll update this thread again when I know more.

My opinion at this point is check your car's flywheel for damage if you have this P0335 issue. In my case I have a new flywheel, so the shop looked there first.

My 370Z Flywheel damage - only 3 months old. Forced P0335 code
 

I got the car back from JoTech yesterday. It's all better now. A new Mid-Weight flywheel from Z1 fixed this issue for me. Many thanks to JoTech and Kevin, Tony, Seth and Christian for their hard work and diligence. The flywheel and missing tooth are out and the new Mid-Weight Z1 Flywheel is in. What a difference this 21 pound flywheel makes. It is smooth and quiet. It revs better in my opinion than the lightweight unit. My guess is that the 370Z engine likes a bit of weight on the crank in order to rev smoothly and stay relatively quiet. The P0335 code is gone now. This broken tooth was the direct cause of the poor running and failure to rev smoothly.

I hope none of you run into this issue with your 370Z, but perhaps my experience and photo essay can help you identify and/or clarify this issue for your P0335 code

Here are photo's of the damaged flywheel and the missing tooth:

Flywheel:
http://www.the370z.com/members/corsa...p0335-code.jpg

Flywheel:
http://www.the370z.com/members/corsa...p0335-code.jpg

Flywheel:
http://www.the370z.com/members/corsa...d-flywheel.jpg

Tooth:
http://www.the370z.com/members/corsa...p0335-code.jpg

Sorry for everyone who messaged that I haven’t responded, I’ve never used a forum and didn’t know how to find my post also my email wasn’t and still isn’t receiving any notifications regarding this post, sorry again.

But yes I’ve resolved the problem and it turned out to be the exact same problem which Corsair had, one of the teeth on the back of the flywheel was snapped off, I’m unsure if it’s a problem which was caused by the mechanic or the product was defective but it also happened to my factory flywheel so I’m guessing it’s due the installation because I’ve had a new flywheel installed from a different shop and it’s been running perfectly fine since then