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Old 07-21-2019, 09:55 PM   #26
mxdude105
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I drove my '17 WRX back to back with an '18 STi on the same section of roads. Both stock. I was considering trading up to the STi to see what all the fuss was about. Came away with these impressions:

STi sounded better.
STi had nicer seats than my base WRX
STi had a bit more grunt over 4500rpm or so.
STi mechanical shifter felt notchier, not sure if i'd say "better"
WRX had more low-mid rpm grunt, less turbo lag
WRX cruises on the highway a few hundred rpm lower.

Other than that, for street driving they felt very similar. I preferred the EPS in the WRX to the HPS in the STi. I'm sure the trans/diffs/brakes in the STi are better for track and autocross. But unless you're going to do those sorts of things on a regular basis, the WRX is 95% of the car for 75% of the price...
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Old 07-22-2019, 12:35 PM   #27
vlad11591
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Don't do it just get an STI ...

It still won't be an STI even after all the modding. Definitely not worth it unless you'll be doing the work yourself and don't like money. Would be cool as a project, but even so, you probably don't like money much.

I tried to make my WRX into an STI, and getting into an STI it's just.... different. More raw, sounds better, DCCD tuning is clutch, shifting feels smoother, seats are nicer, interior is a bit nicer (got rid of that cheap plastic/fake carbon fiber) .
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Old 07-22-2019, 04:55 PM   #28
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Originally Posted by vlad11591 View Post
Don't do it just get an STI ...

It still won't be an STI even after all the modding. Definitely not worth it unless you'll be doing the work yourself and don't like money. ) .
truth

only fun part is smoking a cocky STI driver with a WRX.. lol
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Old 07-22-2019, 04:58 PM   #29
idiosyncrisia
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Smoking STI's is my favorite thing to do on the track. The WRX is plenty fast on a tight track. I have no idea what I am missing from the drivetrain on the WRX vs the STI as I have never driven an STI, but I do get pointbys from the bing wang gang on the straights.
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Old 07-22-2019, 05:11 PM   #30
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Originally Posted by killadawg View Post
truth

only fun part is smoking a cocky STI driver with a WRX.. lol
Yea but you're an anomaly, and have a fully built WRX.... Plus you'll always just be the little bro to the STI

I always try to convey it like this. Sure you can mod a 340xi BMW to M3 standards, but it won't ever be an M3. There are pretty big differences in chassis, suspension, that can't be changed.

STI- LSD , better transmission, better suspension, better sounding, more aftermarket support as of now, hydraulic steering, aesthetically nicer looking. Pretty much all I can think of.
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Old 07-22-2019, 05:40 PM   #31
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Everything in the STI is better but the engine. Overall it just feels so much more solid in comparison but again, the FA is just much "lighter on its feet". The way the turbo spools, specially in the 2nd gear. With some ethanol this car is a beast and you can still manage pretty good fuel economy. If the STI came with the FA motor, I would trade up on the spot. And I am just talking about mild tuning here and enjoying the car as a daily. Obviously you can take the EJ much farther money not being an issue.
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Old 07-22-2019, 06:54 PM   #32
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Everything in the STI is better but the engine. Overall it just feels so much more solid in comparison but again, the FA is just much "lighter on its feet". The way the turbo spools, specially in the 2nd gear. With some ethanol this car is a beast and you can still manage pretty good fuel economy. If the STI came with the FA motor, I would trade up on the spot. And I am just talking about mild tuning here and enjoying the car as a daily. Obviously you can take the EJ much farther money not being an issue.
I like the FA, twin scroll, faster spool up, no turbo lag.... but ethanol on ej wakes the car up just as it does on the FA. The mod path to make decent power on EJ is just different than the FA. I guess a bit more costly too, but honestly 310 is ok for daily driving for me. I was happy with my stage 1 WRX which should be pretty comparable to the STI stock. The only gripe I have about the newer STI is that the OTS map's are pretty lackluster right now.
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Old 07-22-2019, 09:21 PM   #33
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Originally Posted by vlad11591 View Post
Yea but you're an anomaly, and have a fully built WRX.... Plus you'll always just be the little bro to the STI

I always try to convey it like this. Sure you can mod a 340xi BMW to M3 standards, but it won't ever be an M3. There are pretty big differences in chassis, suspension, that can't be changed.

STI- LSD , better transmission, better suspension, better sounding, more aftermarket support as of now, hydraulic steering, aesthetically nicer looking. Pretty much all I can think of.
Not arguing that point at all.. Just letting OP know that "yes it is possible, as I have done it" was it worth it? thinking back.. not really, but hey I had fun tinkering and giving others my $$$!! like I said, live and learn. (shhhh I can just buy a wing and some badges and no one will ever know.. shhhh like putting big bro's pants on )

PS.. no difference in Chassis, hubs, suspension linkage, bracing, etc... so not as drastic as the BMW example..
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Old 07-22-2019, 09:42 PM   #34
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Originally Posted by killadawg View Post
Not arguing that point at all.. Just letting OP know that "yes it is possible, as I have done it" was it worth it? thinking back.. not really, but hey I had fun tinkering and giving others my $$$!! like I said, live and learn. (shhhh I can just buy a wing and some badges and no one will ever know.. shhhh like putting big bro's pants on )

PS.. no difference in Chassis, hubs, suspension linkage, bracing, etc... so not as drastic as the BMW example..
Yea many people do the wing to make it look like an STI. No idea why, but hey it's their car.

maybe not chassis, to lazy to research, but brakes and other suspension components make a big difference, and are a royal PITA to swap to WRX.
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Old 07-24-2019, 12:50 PM   #35
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Quote:
Originally Posted by killadawg View Post
PS.. no difference in Chassis, hubs, suspension linkage, bracing, etc... so not as drastic as the BMW example..
Yeah, that's the info I'm interested in as from what I understand going thorugh the shop manual, there's far more similar between the 2015+ WRX and STI than people think, so long as you ignore the transmission, engine, interior, and steering.

There's also been a fair amount of responses that can basically be summed up as "don't know the differences, but don't do it and just get an STI" which have not been helpful.
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Old 07-24-2019, 01:45 PM   #36
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Yeah, that's the info I'm interested in as from what I understand going thorugh the shop manual, there's far more similar between the 2015+ WRX and STI than people think, so long as you ignore the transmission, engine, interior, and steering.

There's also been a fair amount of responses that can basically be summed up as "don't know the differences, but don't do it and just get an STI" which have not been helpful.
that's basically the whole car lol, those are huge differences. You also won't get LSD, DCCD, spring rates may be a bit different on the newer STI's and struts, not sure if they run inverted struts like the WRX premium/limited do.
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Old 07-24-2019, 02:04 PM   #37
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Yea many people do the wing to make it look like an STI. No idea why, but hey it's their car.

maybe not chassis, to lazy to research, but brakes and other suspension components make a big difference, and are a royal PITA to swap to WRX.

I have an 07 WRX limited I paid $3,800 and since have full STI swapped it myself. I did all the labor and yes I would agree if you canít do it yourself good luck! Itís very costly but parts are not that much if you know where to get them. Driveshaft is a different size so you have to swap all that but your right other than suspension and drivetrain they are basically the same and the EJ25 platform in the WRX is much more stable power if you build it right. I love my whip 😃 I like it better knowing every bit of the car Iíve taken it apart so many times!! Personal preference I didnít have the money to spend on that STI tag but best believe put mine next to yours you wonít be able to tell it was a WRX
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Old 07-24-2019, 02:42 PM   #38
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I have a 2003 wagon that has a full V8 driveline swap and V9 engine in it. It would have been easier to get an STi but I didn't like the new ones, and then it was always my car from off the lot in 2003. Also an STi wagon is otherwise impossible to get.
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Old 07-24-2019, 11:06 PM   #39
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Transmission is only thing I would swap from an sti to wrx, after market everything else will be better
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Old 07-26-2019, 02:54 PM   #40
Nahoward
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that's basically the whole car lol, those are huge differences. You also won't get LSD, DCCD, spring rates may be a bit different on the newer STI's and struts, not sure if they run inverted struts like the WRX premium/limited do.
While it would be stupid easy to integrate the LSD and DCCD into a MT... that's two things that I wouldn't do for a CVT as I have no idea how they'd integrate in with the drive modes and TCU. And given how much a CVT costs, I'm not going to try a mod for the WRX that I don't understand how it will interact with the rest of the drive train.

That's why I'm focusing on the other stuff, especially since bringing in a hydraulic steering system is not something I'm interested in. That and I'm wondering (aside from struts and springs) if it's not possible to create sort of a hybrid WRX/STI that's running the CVT.
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Old 07-26-2019, 03:12 PM   #41
simpleJ
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While it would be stupid easy to integrate the LSD and DCCD into a MT... that's two things that I wouldn't do for a CVT as I have no idea how they'd integrate in with the drive modes and TCU. And given how much a CVT costs, I'm not going to try a mod for the WRX that I don't understand how it will interact with the rest of the drive train.

That's why I'm focusing on the other stuff, especially since bringing in a hydraulic steering system is not something I'm interested in. That and I'm wondering (aside from struts and springs) if it's not possible to create sort of a hybrid WRX/STI that's running the CVT.
Iím trying to imagine an ej257 on the cvt powerband and.... yea.... not good
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Old 07-27-2019, 11:45 AM   #42
Nahoward
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I’m trying to imagine an ej257 on the cvt powerband and.... yea.... not good
I wouldn't change out the FA20 for the EJ as it can be argued that the FA20 was designed with the CVT in mind, so (IMO) there's no point in changing either the engine or the trans.

I suspect that the CVT could (in theory) handle an EJ... but you'd need to figure out how to get the TCU to work with the EJ, and there's a whole lot of engineering work you'd need to do to get things to behave. In other words, I think it's technically possible, just not cost effective when the FA20 already works just fine with the CVT.
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Old 07-27-2019, 02:45 PM   #43
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Wasn't happy with my 2016 base WRX, tried a 2018 used STI. It shifted a little better, suspension wasn't as nice as the premium shocks and struts(as a daily driver) that i installed. Didn't notice it being any quieter though, as it was supposed to have the thicker glass. Yes it had more low end grunt and pulled a little better, and sounded nicer. But they where going to give me 24,000$ for my low miles(16,000km) mint wrx, and wanted 39,000$ for a used STI with more miles. No thanks, i bought a Cobb app (600$) with a maperformance tune. Did the perrin shifter mod and group N mount(180$). Love it, shifts nice. Then spent about 40 hours and 500$ adding sound deadning tape and foam to the floors,doors, and trunk. 125$ for a slightly used resonated STI midpipe. Very happy with my car now as a daily driver.
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