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Old 08-31-2019, 08:37 AM   #1
CRAracer05
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News 2021 WRX and WRX STI - FA24???

Check out this article from The Drive confirming the EJ25 will be replaces with an FA24 variant come 2021!


https://www.thedrive.com/news/29632/...sepower-report
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Old 08-31-2019, 08:46 AM   #2
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I see a report of a report and no confirmation from Subaru. Did I miss it?
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Old 08-31-2019, 08:50 AM   #3
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Awesome news if true! Will be interesting to see whether they add electric power steering(all but a guarantee at this point) and an active suspension.
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Old 08-31-2019, 09:15 AM   #4
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IBTL


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Old 08-31-2019, 09:18 AM   #5
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It says an FA24 STI is likely, NOT is confirmed. This article is just a summary of another article that is guessing what the next gen will be like
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Old 08-31-2019, 09:20 AM   #6
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Nothing confirmed. This is the latest rumor:

https://www.roadandtrack.com/new-car...platform-news/

Japan to get FA20 STi. They are still deciding whether we are going to get the same FA20 or FA24 for US.
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Old 08-31-2019, 10:48 AM   #7
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@Straight6

Thanks for that link, I haven't seen that yet, I'm not sure how I feel about an FA20 STi with 315hp. I really hope we get the FA24 w/ at least 340hp. What I'm really interested in is how the new generation will look.
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Old 08-31-2019, 10:59 AM   #8
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Every article is a rumor of a rumor lately.. speculating which engine the JDM & USDM versions will receive.. and still referring to Torque New's rumor of the Series.White which Subaru hasn't provided any indication of. The Series.White seems unlikely given the S209, but who knows. Subaru announced the Series.Gray alongside the WRX/STI pricing last year. And they've already announced the 2020 ceramic white BRZ tS..

Of course these rumors are "click bait" (like this thread) and draw traffic to their sites. We'll just have to await official news from Subaru..

Can we change the thread title to "FA24 Rumored" until a credible source is cited?

Last edited by WRXnick16; 08-31-2019 at 11:21 AM.
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Old 08-31-2019, 10:59 AM   #9
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Quote:
Originally Posted by CoronaWRX View Post
@Straight6

Thanks for that link, I haven't seen that yet, I'm not sure how I feel about an FA20 STi with 315hp. I really hope we get the FA24 w/ at least 340hp. What I'm really interested in is how the new generation will look.
Everything suggests that WRX will retain the FA20DIT as it sits with a power bump. The STI version may get upgrades for durability/cooling/bigger turbo but I wouldn't expect more than 315-320 hp, even if it ends up being the FA24 for the US.
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Old 08-31-2019, 02:25 PM   #10
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A 5-10hp bump along with the guaranteed weight increase with SGP means the "new" STI will be only as fast, or slower than the current one which is downright pathetic for an all-new performance car. Sure it may improve in 30-60mph pulls due to the improved powerband, but if they take the same recipe that the 2015+ WRX had it's going to be very disappointing. I sold my 15 WRX after 2 years because it lacked any real sense of feel - very dull and bland. Motor that hated to rev, mediocre gearbox, and a feeling of a plateau of speed once you got it above 2000RPM. Just overall a meh car compared to its predecessors which actually had some excitement to them (minus the 08 abomination of course).
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Old 08-31-2019, 03:16 PM   #11
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FA24 will be a beast of a power plant if it’s tuned proper by STI.
Gobs of torque down low. Meaty power band all the way up.
I hope the chassis, brakes, steering etc. are good to go.
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Old 08-31-2019, 04:02 PM   #12
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Quote:
Originally Posted by Brahmzy View Post
FA24 will be a beast of a power plant if itís tuned proper by STI.
Gobs of torque down low. Meaty power band all the way up.
I hope the chassis, brakes, steering etc. are good to go.
This next batch of engines sound promising. An FA20 with revisions and strengthening could be really good. On 91 and tighter regs tho, I'm a little wary.
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Old 08-31-2019, 04:53 PM   #13
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Yeap. The FA20 runs like trash on less than perfect quality gas. This is a major obstacle they need to overcome.
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Old 09-01-2019, 07:37 PM   #14
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right now the torque figures are at 295 ft lbs. any chance the new sti gets 325 ft lbs of torque. 315-320hp is not necessarily a bad thing if the torque numbers are vastly improved. and if it is the FA24, there will be room to add more power to it. it wont be so high strung, so there will be room to tune them for more power. let's not forget the engine is capable of pulling 8,000lbs, and this one wont be mated to a cvt.
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Old 09-01-2019, 08:07 PM   #15
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Quote:
Originally Posted by bugatti0628 View Post
right now the torque figures are at 295 ft lbs. any chance the new sti gets 325 ft lbs of torque. 315-320hp is not necessarily a bad thing if the torque numbers are vastly improved. and if it is the FA24, there will be room to add more power to it. it wont be so high strung, so there will be room to tune them for more power. let's not forget the engine is capable of pulling 8,000lbs, and this one wont be mated to a cvt.
The FA24 was designed for torque, not horsepower. It is great for heavy SUV applications, not so much for performance cars. While torque sells cars, hp wins races. FA24 was literally designed for the Ascent and its towing capabilities. I am not sure if it will be a good fit for something like the STI.
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Old 09-01-2019, 08:46 PM   #16
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I haven't seen much info on the FA24 engine design. Prime Motoring has only mentioned that Subaru improved upon the FA20's weak areas like the rods.

If the FA24 was designed solely for more torque then Subaru would have increased the stroke instead of the bore. The FA20 is a square engine (86mm bore & 86mm stroke). The FA24 is oversquare engine (94mm bore & 86mm stroke). This is more typical with high performance, higher revving engines. The EJ257 is an oversquare engine as well (99.5mm bore & 79mm stroke). The EJ257 is limited by the UEL header & head design (compared to the EJ207 - 92mm bore & 75mm stroke). The smaller stroke allows for lower piston speeds at high RPMs. Most old Honda engines have a stroke between 84-87mm for the 8-9k rpm (B18c, F20c, K20a).

The Ascent's FA24 is probably hp limited by the small WRX turbo, stock tune, intake manifold, tmic, etc.

Last edited by WRXnick16; 09-03-2019 at 08:11 PM. Reason: typo
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Old 09-01-2019, 08:54 PM   #17
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Quote:
Originally Posted by WRXnick16 View Post
I haven't seen much info on the FA24 engine design. Prime Motoring has only mentioned that Subaru improved upon the FA20's weak areas like the rods.

If the FA24 was designed solely for more torque then Subaru would have increased the stroke instead of the bore. The FA20 is a square engine (86mm bore & 86mm stroke). The FA24 is oversquare engine (94mm bore & 86mm stroke). This is more typical with high performance, higher revving engines. The EJ257 is an oversquare engine as well (99.5mm bore & 79mm stroke). The EJ257 is limited by the UEL header & head design (compared to the EJ207 - 92mm bore & 79mm stroke). The smaller stroke allows for lower piston speeds at high RPMs.

The Ascent's FA24 is probably hp limited by the small WRX turbo, stock tune, intake manifold, tmic, etc.
longer stroke makes the engine a lot wider, they are constrained by packaging.
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Old 09-01-2019, 09:03 PM   #18
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Quote:
Originally Posted by n2oiroc View Post
longer stroke makes the engine a lot wider, they are constrained by packaging.
Makes sense, thanks!

At least it allows for the potential of a high revving engine . May just require some headwork, larger turbo, etc.
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Old 09-01-2019, 09:19 PM   #19
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Quote:
Originally Posted by WRXnick16 View Post
I haven't seen much info on the FA24 engine design. Prime Motoring has only mentioned that Subaru improved upon the FA20's weak areas like the rods.

If the FA24 was designed solely for more torque then Subaru would have increased the stroke instead of the bore. The FA20 is a square engine (86mm bore & 86mm stroke). The FA24 is oversquare engine (94mm bore & 86mm stroke). This is more typical with high performance, higher revving engines. The EJ257 is an oversquare engine as well (99.5mm bore & 79mm stroke). The EJ257 is limited by the UEL header & head design (compared to the EJ207 - 92mm bore & 79mm stroke). The smaller stroke allows for lower piston speeds at high RPMs. Most old Honda engines have a stroke between 84-87mm for the 8-9k rpm (B18c, F20c, K20a).

The Ascent's FA24 is probably hp limited by the small WRX turbo, stock tune, intake manifold, tmic, etc.
Straight from Subaru, the FA24 was designed for higher torque not horsepower. Main goal was towing capacity and low end torque. The rods are not forged, they are the same J shape design and material as FA20, just larger. The FA20 has a very high compression ratio for a turbo engine. The cylinder pressure can get out of control, that is why good quality gas is key and also why you see some people make 400 whp for thousands of miles and some toss rods on the stock tune.
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Old 09-01-2019, 09:30 PM   #20
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^Agreed on the fuel quality and high cylinder pressure.

More displacement = more torque. There's nothing inherent to the FA24's engine design that would prevent it from making more horsepower than the WRX's FA20. An STI version of the FA24 would make more power than a FA20 given a similar turbo and head setup. They would have a similar potential powerband with the FA24 just making more power thanks to the extra displacement from the larger bore.

Again, this is just all under the assumption that there will be a STI version of the FA24 . But Prime Motoring has had great luck with the FA24 making over 500whp on the stock long block. They're limited by the stock fuel system now. It makes more power and torque than a comparable FA20 setup.
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Old 09-01-2019, 09:38 PM   #21
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No doubt it can make and handle more power but my main point is that in its current form it was designed for the Ascent. I am curious to see what changes Subaru can make to make this engine fit the character of the STI. As it stands, it is pretty much a Subaru’s version of the Mazda’s 2.5T. An engine designed for an SUV, not a performance car, per say. But it definitely has the potential.
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Old 09-01-2019, 10:05 PM   #22
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Nonsense about the FA24 being an SUV engine, or designed for more torque, lol.
It’s a freakin engine. It can be specifically tuned and have specific components that lend it to differing workloads. The new Legacy, for instance, or an STI.
It’s got craploads of torque because it’s a direct injection, turbo, large displacement motor, lol. It is a PERFECT for an STI.
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Old 09-01-2019, 10:13 PM   #23
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One of the articles claimed that WRX would downsize to an FA18, and STI getting an FA20. If so the price of both models should be cut. Does Subaru currently have a 1.8L FA engine? I know Subis aren't made for straight up speed but the current STI is slow. Surely it's time for an upgrade, not a downgrade. I only hope these are nothing more than rumors.
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Old 09-01-2019, 10:31 PM   #24
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Quote:
Originally Posted by CoronaWRX View Post
What I'm really interested in is how the new generation will look.
Look at the Viziv Performance and Performance STI Concepts. Now imagine all of their styling cues watered down a bit and grafted onto the SGP Impreza.

Just donít be shocked that water is wet when the real thing isnít basically an exotic, like everyone somehow was when the 15 WRX looked like a WRX.
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Old 09-01-2019, 11:05 PM   #25
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Quote:
Originally Posted by fredzy View Post
Look at the Viziv Performance and Performance STI Concepts. Now imagine all of their styling cues watered down a bit and grafted onto the SGP Impreza.

Just don’t be shocked that water is wet when the real thing isn’t basically an exotic, like everyone somehow was when the 15 WRX looked like a WRX.


I just hope the next gen gives us a little more design to be excited about than the VA. I know design isn't really a Subaru thing, but their concepts show that they do have the ability.

Last edited by CoronaWRX; 09-02-2019 at 01:34 AM.
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