Hi guys, I am quiet new to the g37 scene and one of the very few drivers in Australia as i had to get mine imported from Japan.

I am looking to upgrade the performance of my car and due to my lack of knowledge I am stuck between going with the Stillen Vortech supercharger kit or a custom twin turbo set up installed by a shop that specialises in 370z performance.

I don't want to say that money isn't an issue and that I don't care about the price difference between the two set ups but what I am trying to acheive is the best possibly RwKw without losing to much reliability of the car and/or find myself in a situation where I have to keep spending money to fix issues due to my new set up.

Basically I own an 09 G37 Coupe that's a 7spd Auto.
And with what little research I have done I believe a SC will be more suitable for my car then a TT due to the fact it is auto and also that it will cause less engine stress and future issues then a TT.
But being the stubborn type of person I am, I would like to imagine that these facts may be untrue and that having a TT set up in an Auto wouldn't cause too much issues in the future then what a supercharger would cause.

However I also believe that a SC will make my car more responsive off the line then what a TT would be, therefore that rapid acceleration to me is appealing as it can assure me that not many cars I come across will be able to take me on head-to-head during the odd occasion.

Hopefully you guys can help me out and give me some more info as I'm quiet keen to get this upgrade underway in the next 6-8weeks.

 

If it were me, I'd be leaning more towards the SC and I almost went that route but my circumstances made me reconsider. A lot of guys have ran them, have had little to no problems, and it's been done quite a few times so the template is there. You'll throw down solid numbers and maintain the daily driver attributes of the car.

The TT is a bit of un-chartered territory if you will. Only a few guys have done it and like you kinda pointed out - everything is custom so there is no cookie cutter way to follow. These G37's build threads also seem to speak a lot about multiple upgrades to different components in order to compensate for boost. Then again, if you keep the boost mild, I don't see why there'd be a problem - but who does a TT to be mild?

As for the 7AT I'd send my valve bodies and torque converter to Level10 and have them bullet proof everything. This will give you 100% peace of mind despite which route you take. Probably cost you an extra 2-3k but it would be worth it in my opinion. You should browse their site or call them.

Lastly, take a breeze through some of the build threads in here of both the Stillen and TT set ups. See what those guys have said, ask them questions.

 

With the supercharger route you are extremely limited in support, namely Stillen. There are a few options for going turbocharged and more support.


I have a TT 7A/T and love it! Like RMB said, I would definitely spring to have the transmission built (Level 10 does amazing work). When it comes down to it, it is really what you want.

 

^one of the build threads I was hinting at

 

Thanks, I've learned my lessons along the way. Definitely some heartache and a lot of $$$ throw in the whp pit.

 

Yea, but I envy guys that just go all in like that. I wanted to go that route with mine but it's my DD and I have accepted the fact that I have to take care of other stuff (wedding, items for the home) first before I can consider committing. Luckily, my S.O. doesn't object too much since she says that sure beats the hell out of me being a drunk, addict, or chasing tail. Bless her heart.

That being said, what's the current mileage of your car? I've always talked myself out of it since by the time I could put FI to the G37 it would be sitting at 50,000 roughly. Would you consider that a little late in the game to be doing FI?

 

Twin turbo here.


The upgrades you do are less a function of which kit you go, and more a factor how reliable and how much HP you want. Do you have to do a return fuel system and larger injectors at 500 WHP? No, but I would rather do it to make sure my motor is getting enough fuel and not leaning out.


I would suggest a BP single turbo, but I don't think they do those for automatics. Twin turbo is definitely the more labor intensive option, and it has more parts, but I don't see it as being more prone to failure. I can and have daily driven my G37 at 550 WHP, and to be honest it isn't bad (and I am a manual). Turbos can be harder on an engine due to the nature of how they work vs centrifugal superchargers. I bought a twin turbo kit from a highly regarded 370/G37 manufacturer and their support was amazing. However, you are RHD I assume, and that vendor doesn't make a kit for RHD. I would be afraid that on top of the normal added expense of installing a TT, that you would also have to factor in the cost and TIME of a custom setup. There is not a lot of space, you it would probably take multiple tries for your shop to get the right clearance down near the headers.


I think the WTQ the 7ATs are regarded to handle up to is 350 WTQ? After that you have to start upgrading the 7AT. Hard call for you to make. Don't know what I would do.


I also boosted mine at 70,000 miles. Had a compression and leakdown test done before and after and my numbers are golden. I also maintained my engine very well with consistent, good fluid changes.

 

I think SC is a good choice if you can be happy with ~400whp. Just don't try to squeeze more than that out of SC unless you have enough money in the "my motor popped" fund.

If you ever foresee going over 400whp then you should opt for turbo and the supporting mods mentioned above (fuel return, larger injectors, built transmission, etc).

 

I should of mentioned before that I have spoken to a company in Victoria, Australia where I live and they have recommended to me to go with the supercharger as it is less painful on my engine and still gives me enough power once all the extra upgrades like fuel pump, water-to-air cooler, injectors, radiator, oil cooler kit, etc are installed.
They also mentioned they are happy to customize a TT as they have done it on over 10 other Nissan 370Z and to be honest they are one tof he only companies willing to work on my car as they have had past experiences with them, so for that in itself I trust that they would do a good job. But as they said to me my 7AT transmission would suffer long term with the amount of added Tourqe and HP.

But like I said before I am abit stubborn and being a tradie myself (aircon mechanic) I feel like sometimes people talk down a "hard or difficult" job because they are either to scared or to lazy to attempt it therefore by talking it down and making it sound worse they can convince people to go with the "easier" job in this case and bolt on supercharger LOL.

I'm still quite keen on leaning towards the TT for 2 important reasons to me.
1 - being the fact there's only 20 something G37s in my state I want mine to stand out and obviously be the fastest
2 - I forgot to mention also at the start that I only drive this car on the weekends/ special occasions and I only have 61,000kms (less that 40,000 miles)

With that being said because my car is not a DD I would argue that because I drive it a low amount of kms or miles per year, that the engine and 7AT should be able to handle it?

Honestly at the end of the day I am trying to achieve the best kw increase without losing too much reliability of the car, but I would hate to spend near $10-12,000 AU on a supercharger + tune and then after a few months think to myself I should of spent $13-15,000 AU and gone with a TT.

Someone help knock some sense into me please.

Ps: if you Instagram search #umyrin you will be able to view my Instagram and see my car.

 

Agree with everything here. If you have a shop who has done multiple custom TT kits and people are happy, and you are willing to eat the cost, it is almost a no brainer. Build the trans, get a turbo, get supporting mods, and tune it and be happy. Just know that without some serious drag tires, you will never put that power to the ground. I slip in every gear I have tried to get on it, and I have 305 rears and an upgraded Torsen style diff.

I could argue that I can drive my turbo in such a way that it would be less harsh than a centrifugal supercharger. You can choose how to build boost in a turbo.

Oh, and if you want to do it right, nearly double the costs you just quoted.

 

Fair enough, I think I will get quoted again on the twin turbo kit and if all goes to plan and I don't exceed to far beyond 400rwkw then I'll be happy to see how my car goes.
Either way I'll post up my build so that people can see and maybe even learn something from my upgrade.

I really appreciate everyone's comments and advice and answers to my questions.

I look forward to what the future holds for my beast

 

There's a new whipple roots-type supercharger kit coming out. It'll still necessitate building of your 7at but it looks like it'll be an amazing kit. The only caveat is that it'll require a custom hood.
RJ MFG Supercharger kit Feeler... - Nissan 370Z Forum

 

I personally hate superchargers unless it's a centrifugal one, like the kraftwerkz kit for the Honda S2000. In my book turbos or no go for me. You will have to build the 7at for power though. If you like supercharger's then by all means. Just do the A2A setup because the stillen cooler is garbage and so are their tunes. Get a good tune and the a2a setup, should be solid. Lot more info on boost on the 370z forums.

 

Why do you hate non-centrifugal superchargers?
https://whipplesuperchargers.com/ind...e_id=18#tab-28

There's also mention they may do a rotrex kit (centrifugal) but I'd imagine that's a ways away.

 

I hate the whining. The centrifugal on the other hands sounds close to a turbo.