IMO that needs to be machined and cleaned up. From what I can see you have hot spots.

I think Yarb's thought might be it needs surfacing..

There are some chatter marks and possibly some blue hot spots too.

Yarb, be me to it by seconds...

Edited Friday at 02:39 AM1 day by Patcon

Shoot, I wish I would have posted my flywheel's picture for you guys to review too. Here is what it looked like when I removed the clutch disc:

Previously I didn't have any clutch slipping/disc chattering issues.

My plan is to install the turbo next year and replace the clutch with a beefier version if it is needed. Either I will re-surface the stock flywheel then or go a with new lighter version, I will have to do a research about it/ask the forum for an opinion.

Appreciate your input.

On 8/9/2025 at 3:58 PM, darom said:

I wanted to ask you if I should replace the clutch that I had the shop install 15 years ago. The car has put 1000 miles since then.

Or it might be that it's not even worn in yet. I don't see hot spots.

Might help to post a picture of the pressure plate.

Edited Friday at 02:50 PM1 day by Zed Head

Here is one of the PP:

I meant the contact surface. The other side, the friction surface. It can get hot spots also. Hot spots are not necessarily bad though. If it worked fine, no chatter or slippage, and it only has 1000 miles I'd just reuse it. But that's just me.

Do you know the brand and type? It might give a clue on how appropriate it is for a turbo engine. Nissan used the larger flywheel and pressure plate for the turbo and 2+2 cars. 240 mm instead of 225.

Hi Zed, unfortunately I didn't take a picture of the back side of the PP. I did inspect it, it looked like a brand new brake rotor, no scratches, smooth surface. No discoloration. Appreciate you checking it out for me.

I took the car for a test drive - the shifts were fine, no slipping.

Re: the turbo - I am looking at the Protunerz turbo kit. A larger flywheel (240mm) is probably what I am going to end up with. I am sure I will have questions for you guys here on this forum later on :-)

Going with the turbo will probably result in getting most of your answers from Hybrid Z’s site. Not a lot of folks here have gone that route.

@cgsheen1 has turbo experience. darom is already on Hybridz anyway.

@Zed Head I was merely stating that most folks here haven’t gone that route and trying to be helpful of pointing him in that direction if needed.

Thanks, Yarb. I am on hybridz too, I joined it when I started exploring the Megasquirt/turbo upgrade (I was getting fed up with the AFM/running lean etc lol). There is less traffic now as it used to be.

Yup. Most of the pertinent info on Hybrid will be from 10-15 years ago. And probably most of the picture links won't be there anymore. I used to post a lot there but haven't been on in years...

A 225mm flywheel and clutch package won't hold the torque of a turbo engine. I originally used the 260Z stock clutch and transmission (and R180) and realized after one drive the clutch wasn't going to do it - and that was at factory boost. I've been using an Exidy 240mm clutch and flywheel package for 12 years or more (well, 2009... How many is that?). I've been running 10-12 pounds of boost for quite some time.

(You control boost with your RIGHT FOOT and even when you're driving hard, you're not always at full boost. Most of your driving time time is not in boost at all and if you're sized and tuned correctly, you're in and out of boost fluidly - turbo lag becomes a myth)

If you're going turbo DO NOT go with a LIGHTENED flywheel! You need the spinning mass IMO.

Edited 3 hours ago3 hr by cgsheen1