Stillen supercharged | Clutch kit or Quaife Diffy

NissanTracker

Hey Forum,

Have a stillen supercharged 350z nismo. Have some tax money left over for either an upgraded clutch/flywheel setup or rear differential (quaife). Which direction should I go?

I am hoping to get some low end torque and try to get the supercharge to spin up a bit quicker. I figured, lighter flywheel would do the job... but have heard 3.9/4.08 gears on a quaife can also boost the fun factor.

I do occasional HSDE's... factory LSD is terrible with this charger kit

Gooch

yeah if nothing is wrong with your clutch, I'd do the upgraded differential. Will definitely give you more performance with shorter gears and laying down the power versus a lighter flywheel. These cars are incomplete without a proper diff anyways. But remember, with shorter gears you'll have more problems with higher power down the road..

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'15 370z Nismo Tech 6MT Magnetic Black, V2 BP Kit 6467, Motordyne e370, ECUTEK| '06 350z Touring 6MT Carbon Silver

Quicksilvers

Looking at the performance prospective yes indeed the factory LSD leaves a lot to be desired. Upgrade your differential helps tremendously but you will eventually encounter traction issues with the gears unless you address your suspension and tires I’ve seen this more times than not. I recommend keeping your stock gears being F/I. Upgrading your differential is always recommended and should have came this way from the factory. If your 350Z is F/I then I would strongly recommend upgrading your clutch and flywheel first if your differential is still in working order. When I had my Vortech supercharged 350Z the first thing that went out was the clutch before I could even install a smaller pulley and upgrade the fuel system. I was fortunate my differential never gave out before I had the opportunity to upgrade it. How much power are you putting down and how do you use your 350Z? I’d start looking into a twin disc set up you would like to install.

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Mr. Clean

Quicksilvers

I upgraded to a Competition Clutch twin disc set up and changed my transmission fluid at the same time one of the best choices I had made with my 350Z. Later I ended up installing the OS Giken super locker LSD and kept stock gears.

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Mr. Clean

NissanTracker

I am at 375wHP on the stock Stillen pulley. It's about to tick over 60k miles. About 5K miles on the supercharger. I did have plans to go to the next size up... 9lb i believe. Should hurdle me over the 400. Thats really it. Pushing the in-tank fuel system at that point. No plans for 500 on this platform.

I am going to a 370z nismo for next year and will go for 650-700wHP. Actually just picked up a blown motor to start the build during the summer.

Quicksilvers

I was able to find a reputable tuner do my tune I had AAM Competition tune my 350Z and tune was spot on obviously as I never blew the VQ35DE. On stock pulley I was able to make 380 whp very good for this platform as with just the stock pulley Stillen Kit I was able to break the clutch and put it on the flatbed. I wouldn’t recommend doing anything more than the 9 psi. pulley on your stock bottom end as you will be running on borrowed time and maxing out your fuel system I honestly wouldn’t do anything past the stock Stillen pulley with out upgrading. Rebuilding your VQ35DE would be your best option in my opinion. You will like upgrading to the 370Z Nismo because ultimately more power can be made easier to you comparing to the 350Z. I wish you the best of luck with your build should really be interesting for you putting down that much power.

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Mr. Clean

NissanTracker

Luckily, i have an 07 Nismo... which is running the VQ35HR motor. From what I have been told and read, bottom end can take more torque than the DE.

I test drove a 2018 Nismo a few weeks ago. Similar feel to my nismo. Recaro seats are awesome. Almost bought it. $34K with only 5K miles. I am hoping Nissan releases some info about the rumored VR30DDTT powered Z.

Quicksilvers

The VQ35HR engine does have more potential and in the end will hold more power than the VQ35DE. The 2018 Nismo Z is one excellent vehicle to own if you can swing it. Nissan is smart because they are not releasing any information really about their up coming Z35 model it is only speculation and rumor. If you want to trade in or sell you 07 Nismo Z the new Z35 will be well worth the wait. Depending on what power plant Nissan decides to use in the Z35 model I may possibly purchase one?

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Mr. Clean

NissanTracker

Well, looks like "Fate" decided for me. Update: After going to the A-A kit, getting nasty clutch slippage WOT grabbing 3rd gear.

Went with a ZSpeed stage 2 quiet kit with steel flywheel, wilwood clutch master, and new hardware. Was going to use Redline MT-85 and Motul fluids.

Luckily, I have a lift. Just need a transmission jack. Probably tackle this in a couple weeks.

NissanTracker

After the A-A upgrade, I installed a stage 2 Zspeed upgraded clutch/flywheel set up and have about 2K miles on it. Went down a pulley size. Got an updated tune from the Seb and went for a dyno. Maxed out at 12PSI and hit 455wHP (remember, a 350zHR).

I am most likely maxing out the S.C. at this point. Just blowing hot air. I have been thinking about getting TopGunz upgraded larger intercooler, but not sure if the price point will be worth it. Working on a TT motor build for the 14' Nismo right now. Might just use the funds for this. Not sure yet... shall see.