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07-20-2019, 02:16 PM | #1 |
Scooby Newbie
Member#: 486869
Join Date: Jun 2018
Chapter/Region:
TXIC
Location: Dallas, TX
Vehicle:2018 WRX CVT Stage2 Lapis Blue |
Turn a WRX into an STI?
I've got this crazy idea to turn the FA20/CVT into something closer to the STI, and I'm curious what's the differences are. So, aside from the obvious FA/EJ engine, transmissions, and steering, what's different between the 2015+ WRX and STIs?
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07-20-2019, 02:24 PM | #2 |
Scooby Newbie
Member#: 487896
Join Date: Jul 2018
Chapter/Region:
South East
Location: Florida
Vehicle:2018 WRX Dark Grey Metallic 6MT |
I think your CVT is going to mess up your plans for an STI drivetrain swap. The 6MT seems easy enough to sti swap, but I think the cvt ecu/tcu will be a problem.
Seats, headlights, fog bezels, side badges, trunk, center console, gauge cluster, steering wheel, door cards, midpipe. Edit: probably mounts/bushings too If you are serious about this you should just trade in your current car. I get wanting to swap in some better oem parts but doing a full 'conversion' is too expensive and too much work. In the end you're just getting a higher trim stock car with a lower resale value. Last edited by DarkGreyMetallic; 07-20-2019 at 03:31 PM. |
07-20-2019, 02:31 PM | #3 |
Scooby Specialist
Member#: 419593
Join Date: Apr 2015
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07-20-2019, 02:47 PM | #4 |
Scooby Specialist
Member#: 141952
Join Date: Feb 2007
Chapter/Region:
MWSOC
Location: milwaukee'ish
Vehicle:2023 M340i |
every few months someone comes up with the same idea. its cheaper to sell the car and buy a sti.
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07-20-2019, 03:50 PM | #5 |
Scooby Specialist
Member#: 424203
Join Date: Jun 2015
Chapter/Region:
NWIC
Location: Boston, MA
Vehicle:2016 WRX STage ?? Dirty |
So let me chime in!! Sell WRX and buy the Sti!! Done.
I fully swapped trans, subframes, steering rack, drivetrain (except engine) and upgraded tons of parts, brakes, etc.. etc.. The headaches and cost, time etc.. All in all yes I did upgrade even what would have been many STI parts, yet cost wise I spent over 30k ( yes I have a fully built rallyX car which would have cost me half if I'd started with an sti). I fully voided any warranties and my insurance wont cover all my parts (that 30k was cause I did all the work myself, having a shop do that labor you can double it). Should have just bolted an LS in the mini :-). If you have $$ to burn like I seemed to have had?? Stop before you go down the road I did! wish I had those nice sti seats, and interior etc.. that would be another $$ I got mine the day they came out, I thought this platform was a bit better, and I was a bit hyped being my first subaru, yet live and learn. Good luck |
07-20-2019, 03:52 PM | #6 |
Scooby Specialist
Member#: 424203
Join Date: Jun 2015
Chapter/Region:
NWIC
Location: Boston, MA
Vehicle:2016 WRX STage ?? Dirty |
Differences
Engine Transmission Exhaust Brakes Steering lights Interiors Console Etc... etc.. |
07-20-2019, 06:41 PM | #7 | |
Scooby Newbie
Member#: 486869
Join Date: Jun 2018
Chapter/Region:
TXIC
Location: Dallas, TX
Vehicle:2018 WRX CVT Stage2 Lapis Blue |
Quote:
I'll take a look into the exhaust system, and I'll have to decide if I want to with the STI system and combine it with the a Cobb J pipe, or just go with a full cobb turboback exhaust. |
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07-20-2019, 06:55 PM | #8 | |
Scooby Newbie
Member#: 486869
Join Date: Jun 2018
Chapter/Region:
TXIC
Location: Dallas, TX
Vehicle:2018 WRX CVT Stage2 Lapis Blue |
Quote:
Also, where in the exhaust does the STI exhaust connect in with the WRX's exhaust sytem? I'm not thinking a "full" conversion, but I am interested in stiffening up my suspension and handling (sans screwing with the steering), and I'd like to explore what makes the STI different while still retaining what I like about the CVT. This is very much a serious first look into this, as I'm gathering information before deciding what direction I want to go in. |
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07-20-2019, 07:12 PM | #9 |
Scooby Specialist
Member#: 419593
Join Date: Apr 2015
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Unless you are planning on tracking your car on everyday, don't waste your time and money. STi couldn't shake off a FA20 WRX sport pack at the VIR...
https://www.caranddriver.com/feature...storical-data/ |
07-20-2019, 07:50 PM | #10 | |
Scooby Specialist
Member#: 141952
Join Date: Feb 2007
Chapter/Region:
MWSOC
Location: milwaukee'ish
Vehicle:2023 M340i |
Quote:
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07-20-2019, 09:44 PM | #11 | |
Scooby Specialist
Member#: 391748
Join Date: May 2014
Chapter/Region:
NESIC
Location: The Shire
Vehicle:2015 WRX CWP (sold) 2019 STi CWP |
Quote:
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07-20-2019, 10:14 PM | #12 |
Scooby Specialist
Member#: 141952
Join Date: Feb 2007
Chapter/Region:
MWSOC
Location: milwaukee'ish
Vehicle:2023 M340i |
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07-20-2019, 10:23 PM | #13 |
Scooby Specialist
Member#: 391748
Join Date: May 2014
Chapter/Region:
NESIC
Location: The Shire
Vehicle:2015 WRX CWP (sold) 2019 STi CWP |
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07-20-2019, 10:57 PM | #14 |
Scooby Newbie
Member#: 486869
Join Date: Jun 2018
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Location: Dallas, TX
Vehicle:2018 WRX CVT Stage2 Lapis Blue |
I'd imagine the CVT is as well, as launching a CVT is a bad idea. That said, I'm thinking the CVT is a bit of a dark horse for stuff like autocross and other racing where starting from a dead stop isn't going to hurt you as much due to the CVT acceleration characteristic in S# mode.
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07-20-2019, 11:41 PM | #15 |
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Last edited by Straight6; 07-21-2019 at 06:49 AM. |
07-21-2019, 07:41 AM | #16 | |
Scooby Specialist
Member#: 391748
Join Date: May 2014
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Vehicle:2015 WRX CWP (sold) 2019 STi CWP |
Quote:
Otherwise the STi is faster everywhere, and at autocross, especially a fast autocross that requires 3rd gear, you really feel the difference. The stock STi ran times the same as modded rs3's at autocross (and I'm a total n00b) at the last auto x I ran which was a fast autox reaching near 80 at multiple points. OP should follow these steps if he wants an STi: 1. Get in car 2. Drive to dealer 3. Trade in wrx for sti 4. Drive off in STi |
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07-21-2019, 12:20 PM | #17 |
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Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
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07-21-2019, 12:27 PM | #18 | |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
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SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
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171 2018 wrx performance package ???? |
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07-21-2019, 12:47 PM | #19 |
Scooby Specialist
Member#: 424203
Join Date: Jun 2015
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NWIC
Location: Boston, MA
Vehicle:2016 WRX STage ?? Dirty |
You can swap the transmission and rear LSD, add a dccd controller and get that better gear ratio add BBK of your choice, coilovers or a better strut spring combo. SuperPro bushings, cusco and beat rush bracing and white line or SP suspension components.. and most important of all your TIRES!! Your contact patch is the only thing that matters. Whatever allows maximum grip and transfer of power. My current setup will our run and out maneuver any stock STI, but again this is apple's to oranges as mine is not stock.
My caveat is my car is loud, uncomfortable and attracts the wrong attention. And no need for a stereo as it rattles and clanks so much it is pointless (or add 500lbs of sound dampening crap and you are back to being slower..) I've added 1.5way cusco LSDs and at parking lot speeds my car also jerks and pops, not fun for DD. Again what are your goals? That should define what the correct actions should be. Good luck |
07-21-2019, 12:58 PM | #20 |
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You would think that the STI would be more than 1 second quicker at a course that is over 4 miles long, specially that the WRX run was done on a wet/damp surface. You can even see some standing water in some spots. My main point being is that what OP is trying to do makes little to no sense. It would be much more cost effective just to trade up for a STI.
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07-21-2019, 02:51 PM | #21 | |
Scooby Newbie
Member#: 487896
Join Date: Jul 2018
Chapter/Region:
South East
Location: Florida
Vehicle:2018 WRX Dark Grey Metallic 6MT |
Quote:
Brakes on STI are brembos and they're bigger. Any brake swap thread should give exact differences. Bigger brakes will help with heat/fade but stopping distance is grip limited not brake limited. Drivetrain has a mechanical shifter linkage, DCCD, LSDs, and shorter gear ratios compared to 6MT. it's also much stronger. STI exhaust has a resonator in the midpipe that we don't have. Connects at jpipe, swappable. If you look under the back of your car, it's the pipe that splits. Downpipe and headers are different too but you can't swap those. |
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07-21-2019, 02:55 PM | #22 | |
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07-21-2019, 03:14 PM | #23 | |
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Join Date: May 2014
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Vehicle:2015 WRX CWP (sold) 2019 STi CWP |
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07-21-2019, 03:27 PM | #24 |
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Join Date: Apr 2015
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Yes because the brake pads failed on that WRX during the hot lap. You can abuse the STi a lot more at the track, specially when it comes to brakes, heat soak and stock tuning. Again, really worth it if you autocross and track a lot. It really comes down to priorities.
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07-21-2019, 03:51 PM | #25 | |
Scooby Specialist
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Join Date: Nov 2002
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