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Marty's road to ~450WHP

Hi guys, Just want to introduce myself and start a build thread here. Im Marty, from Europe, work in IT software development, played basketball in Kansas (when i was young)

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Old 05-15-2018, 07:36 AM   #1 (permalink)
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Default Marty's road to ~450WHP

Hi guys,

Just want to introduce myself and start a build thread here. Im Marty, from Europe, work in IT software development, played basketball in Kansas (when i was young) and next to cars love to race my bikes on racetracks. Two hours of driving brings me in the Nürburg area of Germany, so keep those roads in mind when reading my build journal :-)



Introduction:

So I was looking for a fun weekend toy. Daily driver is a '17 BMW 330 so I am already quite happy regarding performance/quality and was looking for something that would offer me a complete different driving experience. After shortlisting four cars being 1) GT-R R33, 2) Cayman S, 3) Subaru BRZ and 4) 370z, the 370 won my heart with it's looks, V6 engine and revmatching function combined with quite a modern look and feel. I purchased a 6MT 370z and imported it from Germany last February to the Netherlands. A 2018 370z goes for 130k USD here (yes, thats GT-R money) so not many of them have been sold and they are quite rare.

As soon as I purchased the car I already had in mind increasing power levels, but I first wanted to make exactly sure that the car was aesthetically perfect and technically stable and well serviced.

First modifcations:

Exterior:
  • Resprayed rear bumper: the PDC sensors have been removed but the job wasn't done professionally
  • Resprayed rear trunk lid: i removed the rear screen wiper so got this cleaned and resprayed
  • Resprayed door handles: I like a blacked out look and had the door handles resprayed to magnetic black
  • Powdercoated the silver 19 inch Rays to NISMO anthracite
  • Replaced the stock spoiler with a NISMO spoiler from thespoilercompany on eBay
  • Tinted the windows to aid the blacked-out look

Interior:
  • Had the steering rack modified in order to move the steering wheel +- 2,5" my way for a better driving position (i'm 6"3 but like the wheel close to me)
  • Fit rear view camera kit: ordered, still need to install

Maintenance:
  • Fitted new rear tires. I went with Hankook Evo S2 285/35/19

More horses
So with a lot of cosmetics done and having the car as I want it on the outside, it will be time to look into upgrading power.

My requirements:
  • Needs to provide predictable power output
  • Looking for around 425-450 wheel horsepower
  • Dont want to open the block

For now I am doubting between 1) Topgunz SC kit, 2) Boosted performance single turbo, 3) A used GTM stage 1.5 kit
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Old 05-15-2018, 07:51 AM   #2 (permalink)
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I am kinda partial to the BP kit. Very nice looking car, big fan of paint matched door handles.
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Old 05-15-2018, 07:58 AM   #3 (permalink)
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Personally, I'd shy away from the used GTM kit. If you need parts they just don't exist. Both your other options are solid, but it all comes down to what kind of power delivery you want. I'm partial to torque, so I always lean toward the turbo.
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Old 05-15-2018, 08:06 AM   #4 (permalink)
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Quote:
Originally Posted by Martijn_b View Post
Hi guys,

Just want to introduce myself and start a build thread here. Im Marty, from Europe, work in IT software development, played basketball in Kansas (when i was young) and next to cars love to race my bikes on racetracks. Two hours of driving brings me in the Nürburg area of Germany, so keep those roads in mind when reading my build journal :-)



Introduction:

So I was looking for a fun weekend toy. Daily driver is a '17 BMW 330 so I am already quite happy regarding performance/quality and was looking for something that would offer me a complete different driving experience. After shortlisting four cars being 1) GT-R R33, 2) Cayman S, 3) Subaru BRZ and 4) 370z, the 370 won my heart with it's looks, V6 engine and revmatching function combined with quite a modern look and feel. I purchased a 6MT 370z and imported it from Germany last February to the Netherlands. A 2018 370z goes for 130k USD here (yes, thats GT-R money) so not many of them have been sold and they are quite rare.

As soon as I purchased the car I already had in mind increasing power levels, but I first wanted to make exactly sure that the car was aesthetically perfect and technically stable and well serviced.

First modifcations:

Exterior:
  • Resprayed rear bumper: the PDC sensors have been removed but the job wasn't done professionally
  • Resprayed rear trunk lid: i removed the rear screen wiper so got this cleaned and resprayed
  • Resprayed door handles: I like a blacked out look and had the door handles resprayed to magnetic black
  • Powdercoated the silver 19 inch Rays to NISMO anthracite
  • Replaced the stock spoiler with a NISMO spoiler from thespoilercompany on eBay
  • Tinted the windows to aid the blacked-out look

Interior:
  • Had the steering rack modified in order to move the steering wheel +- 2,5" my way for a better driving position (i'm 6"3 but like the wheel close to me)
  • Fit rear view camera kit: ordered, still need to install

Maintenance:
  • Fitted new rear tires. I went with Hankook Evo S2 285/35/19

More horses
So with a lot of cosmetics done and having the car as I want it on the outside, it will be time to look into upgrading power.

My requirements:
  • Needs to provide predictable power output
  • Looking for around 425-450 wheel horsepower
  • Dont want to open the block

For now I am doubting between 1) Topgunz SC kit, 2) Boosted performance single turbo, 3) A used GTM stage 1.5 kit
Car looks nice.Think about it awhile before you boost.You may want more power later.I would save up and then build the motor and put twin turbos on.
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Old 05-15-2018, 09:44 AM   #5 (permalink)
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Thanks guys for the positive reactions. I'm 100% that I dont have the desire to build the engine. I also love twin turbo systems but it's not for me. I want to throw some money at it and include all upgrades like clutch, fuel system, blabla) and call it a day. I don't consider the RJM kit either, dont want to cut the hood.

So I have been doing some research on all the SC kits and the BP kit and created an overview of the average power output of these kits. I collected some data and tried to make this as comparable as possible. So only 95 or 98 octane (called 91/93 in usa - but it is the same) and no race gas pulls. All cars tuned at Specialty Z to compare the same dyno.

Ofcourse there are many many factors to take into account which my overview doesnt, but i'm just trying to keep it simple and needed to create a rough guesstimate for myself.

The GTM stage 1.5 is not in here, but i believe it's performance is very similar to the Topgunz kit.



So I doubt whether the stock block can take 12 psi and that huge mountain of torque of the BP, especially since I want to be able to brainlessly beat on it in the Eifel region here. Otherwise it looks like the BP just offers the torque that the SC doesn't - which makes sence - so it all comes down to personal prefference.

$-wise proceeding with my build with either the BP kit or TopGunz kit seems to be within ~1k $ of eachother.
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Last edited by Martijn_b; 05-15-2018 at 09:59 AM.
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Old 05-15-2018, 09:50 AM   #6 (permalink)
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You don't need to build a motor for a twin turbo setup. You just have to pull it for the install.
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Old 05-15-2018, 09:55 AM   #7 (permalink)
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Originally Posted by Chuck33079 View Post
You don't need to build a motor for a twin turbo setup. You just have to pull it for the install.
Wow
Here we go again.Point I was making is that you may want more than 450HP at wheels down the road.I was suggesting you think about it.If you are going to go for big HP he will need to build a motor.
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Old 05-15-2018, 09:58 AM   #8 (permalink)
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Originally Posted by Baronsmokes View Post
Wow
Here we go again.Point I was making is that you may want more than 450HP at wheels down the road.I was suggesting you think about it.If you are going to go for big HP he will need to build a motor.
Which is appreciated. I learned through my years to start a build with the end in mind. And also at a certain point to be happy with what you have. I built a Volvo from 250 to 350 to 450 to 600 horsepower and went through 4 engines. In the end i sold the car because i was broke and because i made it a monster which wasnt enjoyable to drive for me.

Ill settle with 400-450 at the wheels. Its good for me.
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Old 05-15-2018, 10:06 AM   #9 (permalink)
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Quote:
Originally Posted by Baronsmokes View Post
Wow
Here we go again.Point I was making is that you may want more than 450HP at wheels down the road.I was suggesting you think about it.If you are going to go for big HP he will need to build a motor.
Understood, but I didn't want the OP to think a built motor was a requirement for a TT setup.
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Old 05-15-2018, 02:09 PM   #10 (permalink)
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Welcome Marty to the 370z club.

my vote goes to the BP kit..tired and tested! it will give you your power goals with ease and just incase u wanna go higher in power u just turn the BOOST up!
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Old 05-15-2018, 02:26 PM   #11 (permalink)
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my vote goes to the BP kit..tired and tested! it will give you your power goals with ease and just incase u wanna go higher in power u just turn the BOOST up!
Plus it is the easiest option to work on BY FAR if you're going to do the install and/or maintenance on your own.
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Old 05-15-2018, 02:28 PM   #12 (permalink)
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I need more info on the modified steering rack. I'd LOVE to have the wheel closer.
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Old 05-15-2018, 03:02 PM   #13 (permalink)
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Plus it is the easiest option to work on BY FAR if you're going to do the install and/or maintenance on your own.
Completely agreed. BP is the simplest, easiest solution to FI. If I didn't get a deal on a TT kit, I'd probably have a BP kit by now.

Topz SC kit looks awesome, but it kind of feels like the SC people are constantly having to send their Vortech units somewhere for servicing.
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You've got a twin turbo sound system, I think you met your audio goals.
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Old 05-15-2018, 05:35 PM   #14 (permalink)
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Originally Posted by Jayhovah View Post
Completely agreed. BP is the simplest, easiest solution to FI. If I didn't get a deal on a TT kit, I'd probably have a BP kit by now.

Topz SC kit looks awesome, but it kind of feels like the SC people are constantly having to send their Vortech units somewhere for servicing.
topguz solution is perfect for someone who wants to go FI and doesnt want to drop the motor for install .. its simple and provides good power if u have AN AUTOMATIC. If your Z is a stick BP is no brainer its the most out of the box power for money u can get and comes with everything.. really even drill bits!
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Old 05-15-2018, 05:38 PM   #15 (permalink)
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I heard SOHO is coming out with top mount single turbo kit soon .. should be interesting
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