Thought I would share this with everyone. 1978 280z l28 280zx 5speed, Stock EFI(for now)
To give a little back story. I daily drive my 280z 19878, so comfort/quality drivability is important to me. As we all know the Z cars are known for having a "clunk". After replacing everything from the motor mounts to the half shafts, the car drove very well. I was enjoying life for a while. But as I continued the drive my car more and more, I found myself dissatisfied with the drive quality again. So I began looking for more things to change. I went ahead and installed 350z seats, those made a huge difference. After that I continued to try more things out.
-I did the Technoversions front diff mount https://www.technoversions.com/DiffMountHome.html
-Polyurethane bushings on everything excluding the rear inner control arms, and the TC rods
-3.9 SUBARU R180 LSD
This is pretty much what i have done so far, and dont get me wrong, the car drives really well. But I still feel kick between On and Off throttle that gets on my nerves a little bit.
So My next idea is, filling in the stock transmission mount with Liquid urethane http://www.energysuspensionparts.com/diymmi
I used a new Nissan mount. Im waiting a couple more days for it to cure, and then will install and post results. They are real soft stock, so we will see how much of a difference this makes. I know I can see my shift rod move a good amount when giving the car gas.
After this my next things in line are Lokar cable throttle, and motor mounts.
I bought the cable throttle already but Im still working on how I will install it.
I would like to use KTM's design, But I haven't figured out how to put together a kit myself, or to see if KTM still has one laying around for sale http://www.zcar.com/forum/10-70-83-tech-discussion-forum/276091-throttle-cable-conversion-kit-interest-does-not-require-different-throttle-body.html
Im sure this will be a huge improvement also!
As Far as motor mounts. Right now I am running New oem. I tried using https://silverproject.eu/en/shop/nissan/solid-engine-mounts-for-datsun-240z-260z-nissan-s30/
But they are a little rough, as my dash was vibrating at idle. But they did feel smooth while driving. I may give them another shot, or maybe try using one solid mount and one rubber?
I really wanted to try the Mckinney Poly mounts, But Those are NLA
So I Hope this helps anyone looking to solve or improve their Z's drive quality. And If anyone has any tips or advice, please share! would love to hear feedback, Ideas or things you have tried as well.
UPDATE: I installed and ram the urethane filled mount. It was a disappointment for what I was trying to achieve. There was to harsh of vibration coming into the car from it. Its not so bad while driving the car once your going 25mph+. But at low speed, especially starting out in first gear, it vibrates a good amount throughout the bell housing. It felt a little like there was a mild missfire on a cylinder. Maybe if I had dynomat installed it could have helped out, but it its a fairly harsh vibration. Its did improve the throttle response on acceleration though. I could really tell when stepping on the gas in 3rd gear.
UPDATE: December 3, 2018. After almost 8 months of waiting I finally got the rubber style motor mount insulators(which they sell still) from Mckinney Motosports to pair with their 240z-280zx motor mount set-up(which is NLA)
Wow! They are amazing. I had in my head an idea of what they would feel like, and they are better. They was no significant increase in vibration at idle(silverproject mounts shook the dash) or at driving speed. The throttle response of the car is much better on acceleration, and it feels very smooth on deceleration 2nd gear and up. I havent driven on them too much yet, so Ill add more details on them as I put more miles but four thumbs up on these!!!!!!
Thanks z240 for selling me your Extra set!