Hey there, I'm a little new to this forum/forums in general.

I just had a quick question for anyone here who have boosted their G with a twin turbo setup and what they did to prepare the car for it.
I'm currently in the process of getting the Greddy kit and wanted to make a list of what else I'll need done before installing it so I can prevent any kind of problems in the future after the fact.

Side note: I have a 2013 G37xS coupe.

Any help will be greatly appreciated, thank you for your time.

 

isn't the xs AWD?
I thought that most all turbo kits made for these cars can't clear the transfer case?
Also, if you are AWD, then the 7AT won't hold up to turbocharging. You are going to want to address the 7AT also.

I was going to go with a TopGunz A2A system for my AWD coupe, and I had set aside $10K to do it. But, I decided to not tinker with my car, I enjoy it's reliability too much to mess with it.

 

You bring up a good point about a clearance issue, I didn't even think about that. I have seen some S coupes use the Greddy kit but I have yet to hear or see anything about someone with an xS put one in and my first thought was there shouldn't be any difference in fitment.

I have also read about the transmission not being able to handle any boost and I thought maybe finding a Q60 transmission could do the trick unless there is a company who can rebuild the 7AT I already have to handle boost.

 

Ive been looking into boosting my 2012 X coupe for a the past few years.

As far as supercharging is concerned, the best options im aware of are the Topgunz Ace and Soho A2A V2 kits.
Although, everyone ive seen online as well as in-person with a Supercharged VQ says if they were to do it again, they would've gone turbo because of the flexibility.

To my knowledge, the only turbo kits that fit on AWD models are the Soho front-mount and the Boosted Performance mid-mount kits (there's probably a rear mount turbo kit that could fit, but they seem like the most annoying to live with).

If you're concerned about the 7at holding the power, both IPT Performance Transmissions and Level 10 Transmissions offer upgrade services to strengthen the internals.

IMO, Ive been really hesitant to have my car boosted because i've had it for close to 7 years and she's been super reliable.
The car's more or less FBO with an ecutek tune and all maintenance gets done at the recommended intervals. It made 323whp on a mustang dyno which is plenty for how I use my car.

 

I appreciate the info thank you.

I'm not really aiming crazy amounts of power, my hopes are 600 to the wheels if I'm lucky (almost like a baby GT-R feel which is probably stupid to say) so i could hopefully stay somewhat reliable while still being able to have some real fun on a track every once in a while and also be the fastest in my friend group haha.

I did also look into Soho and Boosted Performance and they only have single turbo which isn't exactly what I am looking for but if I had to compromise I would do it, though I've always heard single turbos suffer from boost lag and doing a "compound setup" could help mitigate the lag and my only issue I could think of is how I could set up a compound turbo with how cramped the engine bay feels.

I do wanna get the Greddy kit just because I have their exhaust installed on my G and using parts from the same manufacturer just makes sense to me but if the transfer case is gonna be an issue I'd just have to figure out what is causing the issue and how to fix it.

 

I did a quick search on Greddys website and saw they made a 370z Twin Turbo kit which looks like it was discontinued (part number: 11520096).

Although the interesting part is, Greddy posted what looks like a new twin turbo kit being in development less than a week ago on their instagram page. It’s worth calling Greddy Sales or Support to confirm fitment on a G37xs.

I had the same concerns as you regarding lag on single turbo setups, until I started watching YouTube videos of people that actually have the kit installed.

Search on YouTube without quotes “Nitish21 Turbo G35”. He has a complete build using the Boosted Performance single turbo kit and a lot of POV footage of highway pulls.
Granted his build is using a Precision Turbo that’s not normally included in the kit, but you can get a general idea of how the car would behave

 

I went to Greddys Instagram and found the new kit they are working on which only seems to have different air filters from the previous version, but I do think it will still be worth a shot to call and ask if it will fit.

Going back to single turbos I have seen a few videos of people with the Soho kit installed and from the looks of it there was almost little to no lag unless I was seeing things which is more than likely considering my knowledge on turbos is still fairly limited.

I did also meet someone recently who mentioned that a precision turbo would be another great option, I just have no idea where i could find a quality product and if there would need to be some changes made.

 

In the meantime, you can have all of the supporting mods done while searching for a good forced induction kit.

Back in March, I put in an order for upgraded shorty headers to match the resonated high flow cats already installed.(DC Sports NHC4202).

The next engine mod after that would either be a baffled oil pan or an ATI harmonic balancer.
At least for the time being, I really like how the car feels naturally aspirated.

 

I do plan on getting the supporting mods in the mean time yeah, im looking at ISR shorty headers and HFC. I never thought about a Baffled pil pan and that may be a worthy investment to look into.

I do like how the G feels NA but if some has potential to be better I like to push it to the potential, and with boosting the G I dont intend on going overboard and making it unreliable.

 

not sure why you would waste money on shorty headers if you are going boosted

 

Some people have told me to get them more as a backup incase something happens with whatever comes with the kit I choose.

If nothing ends up happening I could just sell them afterwards.

 

You're just burning money. The factory headers are pretty good, there's not much to be gained by swapping them out for aftermarket, certainly not much when compared to what FI will do if you go that way.

You should save your money and not waste time on "supporting mods" for the engine, you're going to need the money and should keep your goals clear. It just sounds like you want to tinker with your car and start spending money before you have a clear plan. When you go FI "supporting mods" like intakes and headers aren't compatible with FI kits. The best supporting mods you can do would be things not related to the engine, such as suspension and appearance.

 

I knew I was going FI,
So the first thing I did was upgrade the brakes !
Tires should be high on the list, but you can wait till you actually sorce a kit, and/or the rims you are gonna run.
once you know what kit, you can pick out an exhaust.
Cold air intakes can be had cheap if you look around.
Found mine used on ebay. Sold 'em on FB marketplace.
Gotta get tuned, might as well find a tuner now.
that way you know if you wanna stick with them or not once boosted.
And your car will wake up in the meantime.
plus your program license fees will be out of the way
Next, I added oil and trans coolers plus an oil pan spacer with drain back ports.
Ended up supercharged, but the extra oil capacity is still a benifit.
if you have a manual, you'll want to upgrade your clutch and slave cylinder.
I changed the oil galley gaskets and timing chains at the same time as the supercharger install. Since the front of the car had to come apart for my rotrex kit anyway.
The mod list never ends lol.
But you'll want suspension, an LSD if you're open, and a radiator.
A crank damper aint a bad idea either.
Don't forget seat time, gotta know your car!

 

Been a while since I popped in here, I've been busy at work.

I appreciate all the info here, I'll definitely have to take the time and get a clear plan for this as I've been prowling the internet for anything little thing that could cause an issue when going FI which probably hasn't been the best thing to do. I have already been looking into better brakes and sticky tires, along with light weight wheels and whether I wanna keep my HKS exhaust or get a 3" exhaust.

As of right now my current stepping stones of a plan are forged internal, fuel system, brakes, tires and wheels, and lastly a bullet proof transmission from level10.

 

There is a lot more to boost than just staying i want this or i want that. Your goals are lofty... "i just want 600hp"... i hope you have the budget for it. 600hp isnt cheap...and to do it reliably is even more expensive. This is going to be an extremely unpopular opinion... but sell your g37 and buy something else and go from there.. especially it being awd automatic with the 7at... you're not going to be able to handle the 600hp with that transmission... if it does it wont be for long. People get caught up on "hp numbers". not to mention you're saying twin turbo... (twice as expensive). im 20k into my turbo build.. and i still need some things. Reason why I build this car is because it was paid off and I wanted to make a "sleeper" build... i did it for the memes.. Huge waste of money.. I'm sure I'll be happy with it for a while though.... Things you'll need to make 600+hp (on 6mt 370z and g37s)... you need 1300cc injectors, you need a fuel return, a large turbo, you need blow off valves, you'll need a wastegate, you'll need to buy the lines for it all, you'll need a ton of heat wrap, you'll need a turbo blanket, you'll need to buy the tuning software, you'll need someone to tune it, you'll need a 4 bar map sensor, make sure you've done all the maintenance (gallery gaskets, while you're in there do the water pump), you'll need GTR spark plugs, bigger brakes, better clutch, dude.. its a lot of stuff... I did all the work on my own... if you got the money i say go for it.. if not save yourself a huge headache, get your headers that you want and just get a soho a2a supercharger. turbo is fun.. but its extremely expensive...... remember the rule (CHEAP, FAST, RELIABLE) you can only choose 2.