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Old 08-20-2018, 05:28 PM   #1
kcinsparks
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Member#: 154608
Join Date: Jul 2007
Chapter/Region: HIIC
Location: Oahu
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2004 Sti
WRB

Default 2004 STi Blouch 18G-XT-R Tune Coming Sept 8, 2018

Starting this thread in case it helps anyone with turbo decisions. will try to post on every thread regarding the 18gxtr so that I can spread the information out as much as possible.

I know it took me forever to decide what to buy, and after sifting through the site for what seems every night for the last few weeks, googling tons of different turbos, and reading through tons and tons of build threads, I just placed an order for my 18gxtr8cm 3Ē inlet and ceramic coated hot side today with Mike from Blouch. I called them directly, and Mike answered. I was super pleased with that. It was a pleasure speaking with Mike. Iím sure they are very busy at Blouch, and I thanked him for his time.

Mike answered all of my questions over the phone, and he helped guide me to what he felt I was looking for. I had already settled on the 18gxtr, but he sold me on the coated hot side and 8cm for the quicker spool I was looking for.

My car is a 2004 STi used as a weekend play toy. I bought it a few months ago with all the boltons from the original owner who babied it for 66k miles. Iíll see him today (working on his house) and ask for as complete of a mod list that he can give.

I know it has:
FP HTA Green IWG 3Ē inlet
Perrin ELH
Turbo XS up pipe
Downpipe
Fujitsubo exhaust
ETS FMIC
850cc injectors
Wally 255 fuel pump
Water meth injection
COBB APv2
Tons of drivetrain mods
Every bushing upgraded to whiteline throughout
Coil overs with 18Ē Wedsports wearing Dunlop Potenzas S04 Pole Positions in 255/35/18
Every strut bar sway bar etc upgraded
Exedy stage one clutch
Plus a few more goodies that I will get from the original owner

This car is stiff! Feels super planted!

I really enjoy the car, but Iím looking for something quicker off the line. A newer technology turbo. Ball bearing. Sized a little smaller, closer to stock size. I donít get on the interstate much, nor do I run in a straight line over the speed limit, so I donít make use of the greenís power. I like twisty back roads. I donít like waiting for the turbo to build boost. I do want more power than a stock turbo. I use pump 92 and water meth injection.

My tuner is Jarrad of PDX Tuning from Portland, Oregon. The Hawaii Suby guys bring him out about twice a year. Heís good friends with the previous owner, and he tuned the HTA green many years ago. Some people say Iím crazy for going backwards in power and giving up the HTA green, but I just want to try something different. After talking to my tuner Jarrad and Mike from Blouch, they both said 18g would be a great turbo for what I want out of my setup.

Current tune is 380whp/430tq 92oct 50/50 meth FP HTA green
I have the dyno graph, will dig it up.

New tune happens Sept 8 with the only change being swapping out the green for the 18gxtr.

I do have a Driveshaft Shop carbon fiber driveshaft I ordered a few months back in my garage waiting for install. Should I install it before or after the dyno tune?

Iím looking to give real world feedback on how differently the car feels in driveability going from a larger turbo to a smaller turbo backed up with dyno numbers from the same dyno. Yes, I know that ambient temp etc makes a difference, but Iím hoping with Hawaiiís weather being consistently around 80 degrees that I can get a close comparison between the two turbos.

Will update this once the tune happens.

I hope this helps anyone out there considering the 18gxtr.

Nick
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Old 08-21-2018, 05:38 PM   #2
silversurfer05
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There is a thread just below this one on that same turbo, pretty much itís capabilities are well known. And yes you do seem crazy for going backwards lol the green is an awesome all around turbo
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Old 08-21-2018, 06:38 PM   #3
.Boston.
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Location: Charlotte, NC
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'02 AllPro SRP STi
'06 V8 4runner/'03 S2000

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Just being honest here but I think you're not going to like the 18g. The green is a solid turbo btw. You'd save $$$$ if you just modded a VF series, the results would be very close to what the 18g is capable of.
I have a blouch 1.5xtr twinscroll and kept kicking myself for not going rotated TS with a larger frame.
I had to rebuild the 1.5xtr after a bit over 20k miles.. The WG also started to loosen up and vibrate LOUDLY. Called blouch and they said it happens and is normal... but they would charge me an arm and leg to send it in to get fixed.

But who knows you might be completely satisfied.

As for the carbon driveshaft, I LOVE mine and would suggest putting it on asap.
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Old 08-22-2018, 05:50 AM   #4
kcinsparks
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Join Date: Jul 2007
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2004 Sti
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As much as I enjoy the green, I want to try something smaller lol. Thatís what she said....said no chick ever. I guess since I didnít own the car from new and go through the various upgrades through the years, I donít know what any other turbo feels like. I did own another 04 sti back in 07 for a year, and I really really enjoyed the stage 2 Cobb ots it had. So I imagine the 18gxtr might give me something in between that and the green.

I talked to the previous owner yesterday, and he originally put the og green on it, ran it for 40k miles, then put the HTA green on when they were released, and ran it for 20k miles. He said his cousins 04 sti with 18g would still beat him from the stop light. So thatís where I decided on trying the 18gxtr.

If Iím unhappy, Iíll stick it on the Subaru shelf in my garage and try something else. Luckily the Sti is just a toy that I can tinker with, make it mine, and enjoy the process.

My local Sti buddy says once I finally get to twinscroll Iíll never look back. I didnít know there was such a thing as a rotated twinscroll. Do I have to ask what a complete rotated ts kit sans turbo would run? Must be a custom job made by only a couple shops nationally Iím guessing. Please enlighten.

I figured Iíll play with the 18gxtr for a while and then order the Spoolinator from KillerB. Then I will see how much I enjoy that setup until I eventually get to the holy grail they call twinscroll. Iíd like to document my different setups on these forums with my dynos and seat of the pants fun factor as well so that others doing research have more data to sift through.

Sounds good Boston. Iíll throw the driveshaft on on the next free day I get with the car. We do have a hurricane heading our way. Just turned cat 5 with 150mph winds tonight. I guess I can always work in the garage via candlelight Question: will the ds also put down a few more ponies to the ground or get me moving a lil quicker? I bought it based on the great reviews that I read in the product review section. Canít wait to try it!
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Old 08-22-2018, 06:44 PM   #5
silversurfer05
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2009 09 wrx delivery
Dgm

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South Florida saying stay safe. Twin scroll set ups from full race will give you an idea as they can delete the turbo choice if you have your own ready to go and price it accordingly
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Old 08-25-2018, 04:29 AM   #6
kcinsparks
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2004 Sti
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Thx silver surfer. Hurricane Lane went from cat 5 to a tropical storm in just over a day. We truly dodged a bullet. I feel bad for the families on the big island that got flooded out. Where I live on Oahu we barely got any rain. My wife and I were actually shocked.

Iíll check out the full race website. I poked around a bit and found out that full race makes a highly liked setup according to the forums. Just curiosity at this point. My neighbor picked up an r32 GTR, and heís trying to sway me his direction. He says it has more power potential from the stock block and something about it drives like a rwd car through the turns until you punch it, then the awd system kicks in. I guess itís a totally different front to rear bias with Nissanís ALTESSA awd system. Iíd have to drive it to find out.
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Old 08-25-2018, 04:52 AM   #7
silversurfer05
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Quote:
Originally Posted by kcinsparks View Post
Thx silver surfer. Hurricane Lane went from cat 5 to a tropical storm in just over a day. We truly dodged a bullet. I feel bad for the families on the big island that got flooded out. Where I live on Oahu we barely got any rain. My wife and I were actually shocked.

Iíll check out the full race website. I poked around a bit and found out that full race makes a highly liked setup according to the forums. Just curiosity at this point. My neighbor picked up an r32 GTR, and heís trying to sway me his direction. He says it has more power potential from the stock block and something about it drives like a rwd car through the turns until you punch it, then the awd system kicks in. I guess itís a totally different front to rear bias with Nissanís ALTESSA awd system. Iíd have to drive it to find out.
Yea they have 4 wheel steering, and the 2 extra pistons can help spread out the extra power reliably which some are looking for over the subaru playform. I personally have to be put at gunpoint to be pushed away from subaru after learning everything i need
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Old 08-25-2018, 09:15 PM   #8
kcinsparks
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I don’t think I would ever get rid of my STi either. It’s just too much fun! But I may have a stable mate in the garage one day.
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Old 09-10-2018, 07:45 AM   #9
horsePOOGAS
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Any update on your tune?
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Old 09-10-2018, 12:40 PM   #10
mistertad
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Indeed any update? I'm still breaking in my motor so it will still be a few months before it will be ready to be tuned.
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Old 09-11-2018, 08:23 AM   #11
Ctuck23
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My buddy has an 18gxt and it feels great. Spools quick and pulls well. Great DD turbo IMO
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Old 09-12-2018, 08:59 AM   #12
horsePOOGAS
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Bueller? ... Bueller?
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Old 09-12-2018, 03:27 PM   #13
Dave D.
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06 Red Ltd.Wagon
20gxtr JJ tuned

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50% odds it blew up on the dyno.
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Old 09-12-2018, 03:32 PM   #14
Xtea
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Quote:
Originally Posted by Dave D. View Post
50% odds it blew up on the dyno.
Is that tuner or just luck?
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Old 09-12-2018, 03:33 PM   #15
Dave D.
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20gxtr JJ tuned

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Quote:
Originally Posted by Xtea View Post
Is that tuner or just luck?
Just a guess, but I've read about this happening more than once in Nasioc over the years.
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