I made up my mind. I am going to purchase one tomorrow morning ( i am at work now and cant). So, if anyone has already installed one pls let me know your impressions, esp HR owners. I know quite a few ppl with pre 07 Zs' using that clutch and they say it's good. thanks

 

I can't comment on the clutch but I just installed the HR flywheel and it's noisy until after 2.5k rpms. Overall a great mod since it revs much faster.

 

Getting the combo installed tomorrow. You have the get the flywheel to run the clutch, and since I busted the OEM pressure plate I figured an upgrade might be a good idea.

I'll let you know Sunday or Monday how I like it.

 

yeap, mine will be installed next week, so i will tell you guys my impresssion. hope its worth the money, cause the stock clutch/flywheel is no good. this clutch supossedly handles up to 1200kg or close to 2700lb. i dont know that the stock clutch engagement is but i assume its lower than that.

 

Let me know how that goes. I finally got a call from the dealership to get my slave cylinder replaced. The service guy agreed to put new clutch and flywheel at a discounted labor rate because of having to pull the tranny anyway. I think I might push back the date so I can get the kit ordered. From what I understand, JWT is the only one which has a clutch/flywheel combo for the 07.

 

Soo....wasn't my pressure plate or slave cylinder.

Clutch was 2/3 gone....I blame drag racing since I know how to drive otherwise...

Flywheel was busted and able to move back and forth (along the axis of the car). Soooo...moral of the story. The factory flywheel sucks with hard launching.

The JWT kit is quite a bit stiffer, the flywheel is a lot lighter. Still getting used to it, but overall can't tell a big difference (good thing). Not too much tranny noise (less than I was expecting) and only a bit of an adjustment.

Happy with it so far. I'll repost once its broken in.

 

Cool, I look forward to the review. If the review is good, I am going to reschedule and get the Clutch and Flywheel Ordered.

 

I recommend it either way. Its not going to be shocking....stiffer clutch and new, and a light flywheel thats single mass (so it won't fail like the mother effing stock one.

 

Cool, I am curious how it does with your drag events.

 

ii have a weird noise in my clutch too and i noticed that its when the clutch is depressed 3/4. when i had my slave cylinder recall i spoke to the guy that worked on my car and told me that my clutch is also worn out, as well as unexpected play of the flywheel back and forth. i had couple of clutch burn outs, many random abusive driving moments, and a track event. overall the OEM clutch is a junk.

 

well, i heard that the JWT clutch/flywheel are good up to mid 400whp/trq. so, i suppose that if we say your car's putting 275whp/245wtq i think that this clutch will not have any issues being abused all day long on the drag strip. however, i would like to hear someone with a pre-07 z to chime in and has the same set up on his car, since the clutch's quality has not been really changed, just slightly altered to fit the 07. from what i heard is only the flywheel. the rest of the clutch is pretty much the same as previous models.

 

Ok, so more driving time and aside from track times I know pretty much what to expect.

There is noticeable difference in how the engine responds to revs. I don't have enough time pushing it hard but the engine does NOT like to sit above 7k without load on it and the flywheel makes the less than perfect balance (its a V6...whatcha expect) more noticable. I don't think its hurting anything, and I don't mind the vibrations since I'm rarely in that situation, but it definitely is there. This leads to - the engine moves through the power band more quickly especially in first and second gear. The clutch is stiff, breaking in nicely - has lots of grab and the light flywheel makes it ... something to get used to.

There is a significant amount of noise from the transmission once the car is warm between 1200-2500 or so where the car sounds like a dump truck. Its something my gf didn't notice until I turned the radio down and pointed it out. Drive throughs.....wear your throw out bearing or shut the car off. Its horrid the increase there is in gear chatter idling in neutral.

Overall....very happy with the upgrade. I'd destroyed my clutch at the track and new that the factory unit couldn't hold the power. The flywheel is a very nice improvement to the car.

 

I'm debating on the clutch.

If you don't drag race, would you recommend the combo or just the flywheel?

 

yeah, i think that if you're not aggressive driver a flywheels will be a good upgrade, since the stock one is heavy. one of my coworkers has an 03 z stock (he's an old man) 70k miles on it the clutch feels like new. yeah you will be fine with a flywheel only

 

Do you ever plan to run road courses or anything of that nature?

I like a stiff grabby clutch personally, and since labor costs more than the aftermarket parts...and the aftermarket parts don't cost more than the OEM, I would make the upgrade still (even for non track use).

But thats a personal preference. The clutch bites the way I wish it did from the factory (getting stronger with miles too).

Its harder on your leg. My shin was sore from sitting in traffic the first day, but again - its basically an OEM feel with a lot more bite.

 

I do plan on doing track events/road courses, but I actually think the clutch is decent for my needs, so I'll probably stick to the stock one and upgrade when it wears out.

 

I would personally upgrade in your position. For $775 shipped (for the combo) its hard to beat. Its preference though, I always thought the stock clutch was too light and didn't grab hard enough (even in just spirited daily driving).

 

I remember now that I tried the JWT clutch before on a G35. It was really heavy, which felt good, but not sure I enjoy it for daily driving.

It's a decent price on the combo, but then again, it's almost twice the price of the flywheel alone.

 

This worries me a bit. Wonder what the effect would be long term ?

Would the engine last me 300 000 Km instead of 400 000 km's ?

 

There is an infinite about of debate that has occurred on any number of forums surrounding this. When I had my E36 there was a direct correlation to the oil pump drive nut backing off and the oil pump no longer being driven, this was because the motor shook around more with the removal of the crank pulley and dampener (and replacement with a UR pulley). The issue was present even without this mod, but was almost gauranteed with it. There was however, no record of long term engine degradation that would indicate a correlation (much less causality) between the mass dampener removal and the bottom end failure.

Theoretically, the crank is internally balanced, and the rods/pistons are balanced to each other to some extent, and the vibrations I feel are just the "less" dampened forces that were already present on the crank and main bearings (and caps). I'm too concerned with it, its something I've never seen a list of failures from to even suggest a correlation, much less a list of failures that would suggest a causality.