Diff mount recommendations

[Riceburner]

I'm thinking of changing out my solid diff mount on my r180, I've heard they are great in racing cause the stop all movement in the front of the diff. Problems i have is It transmits a lot of noise, I have rounded off the retaining nut (it tightend in position), and I've also heard they can break  . I have used rubber originals with the factory strap, with this setup and an R200 I broke 2 new nissan rubber mounts very quickly..... What do guys with big horsepower run..... ron tyler top mount and stiffer OEM mount like Kameari?

 

I've also seen this setup pictured below, it's looks like it could work pretty well but it may still be noisey...... What do you think?

[Zedman240®]

I can agree with you about noise with a solid mount; its all I can hear in the back of my 240! With that mount you have pictured, if the bolt just goes through with the nolothane sandwiched there, it will still transmit some noise through to the chassis. I'll have to take a pic of my diff mount on the top once its on a hoist again.

[Six_Shooter]

I don't know why you guys are getting a lot of noise, through the mount. I've been running one for a year or so now, and noticed no difference in diff noise. *shrug*

 

If I was to go to a rubber style mount again, I would likely look at something that mounted from the top.

[Ben]

I had a nolathane sandwich in my car for a few years - damn the diff whined at speed...

 

Gone back to OEM for the moment, with a plan to upgrade to something similar to the RT setup if required.

The auto is softer on the mount than a manual, but it shifts pretty hard - especially at full boost.

[Scando]

I still just run a standard rubber mount.  The standard rubber strap has been replaced with a 4mm thick metal strap with the ends wrapped around and welded to the same points the rubber strap mounts to.  It's then got a piece of radiator hose wrapped around it so that the diff doesn't bash metal on metal.  Works a treat 

[jamo240]

Hey Gareth.

 

I'm surprised to hear you're breaking mounts. I have run a stock standard setup with my 240Z/L28 on 22psi (400 BHP) and never had a problem...it will wheelspin in 3rd gear, so there's no shortage of torque. To get it to work though, the torque reaction strap must be in good condition and be positioned to be in substantial tension as you bolt the front diff bracket into place. I position it first (using slotted holes), before the diff is in place. After installing the diff, the last thing I do is offer the front mount up (the one that also retains the front end of the rear LCA bushes), and as you bolt it all up, the strap should come under tension, and the whole system can do it's job. The front mount provides support and vibration/noise isolation, while the strap takes torque reaction under hard acceleration....no rubber mount will last long if you keep exposing it to tensile forces....that's what the strap is there for, and it has plenty of strength to take the forces present...I have never seen one in good condition 'snap' due to overloading.

 

I know the racers love to remove all compliance from every bush in the whole car, but it is not necessary, and mounting everything solid will do absolutely nothing of any use, and will ensure every vibration will be transmitted through to the body where you will hear and feel it.

 

Cheers

 

Jamo

[MaygZ]

Jamo,

 

would a setup similar to your spring mounts for your exhaust (proably with stiffer springs) solve the problems?  It should reduce/restrict rotation and also buffer the vibration noise.

 

MaygZ

[jamo240]

MaygZ....I guess you could, but the packaging is tight down there, so it may prove difficult to fit things, and you would be talking about a very stiff spring.

 

In my view, the standard setup is adequate, provided it is set up properly.

 

Cheers

 

Jamo

[Riceburner]

Thanks for the suggestions guys. I've run the standard strap and it was tight but streched over time until the rubber mount let go, I even tried heavy duty chain and that snapped too, destroying my hanbrake bracket in the process... Boy did that scare the sh$t out of me. Managed to drive home like a pensioner with it completely broken 

 

I did have the original moustache bar rubbers in until recently, maybe these were allowing extra movement. I also run solid offset control arm bushes which probably add more noise. 

 

I have now fitted urethane bushes in the moustache bar, and will probably go with the technoversions top mount and a kameari lower mount.