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Old 08-13-2019, 11:10 AM   #1
WRXnick16
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Default Prime Motoring's FA24DIT 500+ whp build (stock block)

Prime Motoring has swapped an Ascent FA24DIT into their Crosstrek. Their goal is to gain insight into the FA24's capabilities and get ahead of the learning curve for the next gen STI (assuming it gets a version of the FA24DIT).

"A glimpse into the future" demonstrating the potential of the next gen, FA powered STI. They took it into their own hands to build a modern STI hatch.

Modifications:
  • FA24DIT OEM Ascent long block w/ ARP head studs
  • STI drivetrain
  • FP XR Blue 73HTZ twin scroll ball bearing turbo
  • Killer B IWG twin scroll header
  • Invidia J pipe w/ 3" catback
  • Cobb intake
  • Cobb FMIC
  • IBR BRZ intake manifold conversion w/ complete TGV deletes
  • Stock WRX ecu w/ Cobb AP & SD tuning software
  • Cobb EBCS
  • Cobb Flex Fuel kit
  • Hardwired fuel pump
  • Nostrum HPFP
  • Stock injectors
  • IAG AOS
-Non-power related: OEM STI 19" wheels, STI Type RA Brembos & Recaro seats

Tuned by JR: 537 whp & 490 lb-ft @ 22 psi on E56. They continued pushing past 560+ whp but ran out fuel leaning out to ~15:1 AFR.. ultimately melting a piston. They believe the stock block should be capable of 600+ whp with auxiliary port injection (aka dual injection).





Look at the monster torque curve! 300 lb-ft @ ~2800 rpm, 400 lb-ft @ ~3200 rpm, 480 lb-ft @ ~4000 rpm.

They also disassembled another FA24DIT engine to inspect the components. Some of their comments:

Quote:
Originally Posted by Prime Motoring;
[Subaru] used the FA20 as a building block to learn and grow. Every weak or inefficient point on the FA20 has been improved upon
Quote:
Originally Posted by Prime Motoring;
The rods are still J shaped but way beefier
Quote:
Originally Posted by Prime Motoring;
From what I can see so far, the future STI will be a great one. I was already a fan of the 2.0 but Subaru really improved on the weak areas. Also using FA24 cylinder heads and modifying them to work in an FA20 application. Only aftermarket part used was a set of ARP studs, everything else was new directly from Subaru. Goal of this is through trial and error, advance the FA platform further and give additional options to future customers. We will take it where no FA24 has been before and probably end up in many little pieces but this is the sacrifice we make for the future of Subaru performance
Quote:
Originally Posted by Prime Motoring;
Update on my FA24 swap. JrTuned and I have been working tirelessly these last 3 days etuning and figuring out little nuisances with this motor. Unfortunately we are out of fuel and at the limits of the MAF so we can not push further for now but happy to have hit the 500whp on a completely stock motor and only 22.1 psi. The most remarkable thing about it is i counted the amount of pulls we have made these last few days and this thing has seen 56 dyno pulls, in some terrible humidity ALL at 460+ whp & 460+ wtq and many with some very nasty break ups and misfires as he dialed in this thing. No break in whatsoever, right on the dyno, straight to ethanol, still on the original non synthetic oil, it has not left those rollers and has not skipped a beat. Tested after and 235psi compression & under 5% leakdown across each cylinder. Color me impressed with this engine. It has me looking very forward to the next gen STI. Now simply waiting on COBB Speed Density software and/or some port injection to further test the limits of the stock engine. IBR sent me mockup adapters for the BRZ manifold and they arrived today so all thats in the works. I want to see where we can take this stock motor to so we have a leg up come time the next gen STI is released. Exciting times ahead.

Mods again for those new to this. 2014 Crosstrek swapped as a 2017 WRX. FA24DIT ascent engine adapted in with stock WRX ecu. FP Blue XR ball bearing turbo, Killer B IWG header, Cobb Intake, Cobb FMIC, Cobb EBCS, Cobb Flex Fuel, Invidia J Pipe, Custom catback & STI 6speed transmission
Keep in mind that this version of the FA24 was designed for an SUV. An STI-tuned version should have even more potential with stronger internals (rods, pistons, etc.), more aggressive cams, better head flow, etc.. and hopefully dual injection like Toyota's D-4S on the BRZ.

The future of the STI looks promising if it's powered by an STI-tuned version of the FA24DIT!!
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Last edited by WRXnick16; 06-19-2020 at 03:46 PM. Reason: Updated with dyno chart
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Old 08-13-2019, 01:22 PM   #2
mamock116
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very cool, thank you for sharing.
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Old 08-13-2019, 02:19 PM   #3
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Thank you to whoever wrecked that Ascent, or did they buy the engine from Subaru? lol
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Old 08-13-2019, 02:44 PM   #4
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Quote:
Originally Posted by Schoat333 View Post
Thank you to whoever wrecked that Ascent, or did they buy the engine from Subaru? lol
I think they used a wrecked ascent motor for mock up, but bought everything new from subaru for the one thats in the car now.
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Old 08-13-2019, 03:50 PM   #5
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Quote:
Originally Posted by alapilusa View Post
I think they used a wrecked ascent motor for mock up, but bought everything new from subaru for the one thats in the car now.
Yep, they disassembled the FA24 from the wrecked ascent to learn about the FA24 internals. They purchased a new engine from Subaru to install in the Crosstrek.
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Old 08-13-2019, 05:00 PM   #6
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I want to see at least 350hp on the new STi with the 2.4L
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Old 08-13-2019, 05:39 PM   #7
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Tbh might wait to build my broke ass car and see if the 2.4 can handle the power I want to achieve. ***128064;

Last edited by Stronkadonk; 08-13-2019 at 06:08 PM.
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Old 08-14-2019, 09:44 AM   #8
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Quote:
Originally Posted by Stronkadonk View Post
Tbh might wait to build my broke ass car and see if the 2.4 can handle the power I want to achieve. ***128064;
Just E85 the FA20DIT and call it good, then buy this when it comes out.
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Old 08-14-2019, 10:59 AM   #9
WrightWRX
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That’s very neat. Looks like I’ll hold off on modding my FA20 more and wait to see what the FA24 can do.
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Old 08-14-2019, 04:44 PM   #10
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Old 08-14-2019, 08:06 PM   #11
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sign me up. I was about to trade my wrx for a used crosstrek to fit my dogs. now I definitely want to.
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Old 08-14-2019, 08:21 PM   #12
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Quote:
Originally Posted by WRXnick16 View Post
Keep in mind that this FA24 was designed to be the SUV version. An STI version would hopefully have more potential with stronger internals (rods, pistons, etc.), more aggressive cams, better head flow, etc.
The block will most definitely be the same. A different turbo, intercooler and exhaust. Maybe revised intake and manifold, maybe some small valve train changes, but I doubt it. They’re not going to take the time to make forged internals or an 8k screamer engine for such a low volume car.
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Old 08-14-2019, 10:25 PM   #13
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Quote:
Originally Posted by rexster View Post
The block will most definitely be the same. A different turbo, intercooler and exhaust. Maybe revised intake and manifold, maybe some small valve train changes, but I doubt it. They’re not going to take the time to make forged internals or an 8k screamer engine for such a low volume car.
Agreed. Definitely no forged internals and probably a redline around 7k rpm.
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Old 08-14-2019, 10:54 PM   #14
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Quote:
Originally Posted by gn4rwhals View Post
Just E85 the FA20DIT and call it good, then buy this when it comes out.
I already maxed & surpassed the stock block's limits ***128128;
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Old 08-15-2019, 08:31 AM   #15
gn4rwhals
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Quote:
Originally Posted by Stronkadonk View Post
I already maxed & surpassed the stock block's limits ***128128;
Nice.
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Old 08-22-2019, 11:42 PM   #16
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Will update the original post shortly.

502whp/484 lb-ft @ 22.1psi and ran out of fuel. Still in the process of mocking up the IBR BRZ manifold kit.

Next up, waiting on speed density & port injection tuning software.

Quote:
Originally Posted by Prime Motoring;
Update on my FA24 swap. @jrtuned and I have been working tirelessly these last 3 days etuning and figuring out little nuisances with this motor. Unfortunately we are out of fuel and at the limits of the MAF so we can not push further but happy to have hit the 500whp on a completely stock motor and only 22.1psi. The most remarkable thing about it is i counted the amount of pulls we have made these last few days and this thing has seen 56 dyno pulls, in some terrible humidity ALL at 460+ whp & 460+ wtq and many with some very nasty break ups and misfires as he dialed in this thing. No break in whatsoever, right on the dyno, straight to ethanol, still on the original non synthetic oil, it has not left those rollers and has not skipped a beat. Tested before and once again tested after, 235psi compression & under 5% leakdown across each cylinder. Color me impressed with this engine. It has me looking very forward to the next gen STI. Now simply waiting on COBB Speed Density software and/or some port injection. @ibuildracecars sent me mockup adapters for the BRZ manifold and they arrived today so all thats in the works. I want to see where we can take this stock motor to so we have a leg up come time the next gen STI is released. Exciting times ahead.
Mods again for those new to this. 2014 Crosstrek swapped as a 2017 WRX. FA24DIT ascent engine adapted in with stock WRX ecu. FP Blue XR ball bearing turbo, Killer B IWG header, Cobb Intake, Cobb FMIC, Cobb EBCS, Cobb Flex Fuel, Invidia J Pipe, Custom catback.
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Old 08-23-2019, 06:18 PM   #17
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A lot of people have been asking them why they didn't go with an EWG setup and the Nostrum HPFP for more power.

Quote:
Originally Posted by Prime Motoring;
The Nostrum pump does fit but we had bad luck with ours. It seized right out of the box.
Quote:
Originally Posted by Prime Motoring;
No EWG - I still drive it often and hate the sound

Last edited by WRXnick16; 08-23-2019 at 06:24 PM.
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Old 08-23-2019, 07:16 PM   #18
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That's already 100 whp more than what FA20DIT can handle on stock internals and way more torque. These FA motors are a game changer. The next STi is going to be an absolute beast.
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Old 08-23-2019, 10:12 PM   #19
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Direct injection is a major advantage.
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Old 08-25-2019, 11:00 AM   #20
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this is awesome! thumbs up to Prime
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Old 08-25-2019, 06:04 PM   #21
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Quote:
Originally Posted by WRXnick16 View Post
A lot of people have been asking them why they didn't go with an EWG setup and the Nostrum HPFP for more power.
The FA20 HPFP has a different part number than the FA24 HPFP so that's the likely issue there.
As far as boost control, the internal option that comes with that turbo is pretty solid and has shown to hold up making even more power i.e. when Clark was testing out the Nostrum HPFP on a WRX. Maybe they just wanted to hold off for now since they're still testing everything out for now?
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Old 08-25-2019, 06:18 PM   #22
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Quote:
Originally Posted by Stronkadonk View Post
The FA20 HPFP has a different part number than the FA24 HPFP so that's the likely issue there.
As far as boost control, the internal option that comes with that turbo is pretty solid and has shown to hold up making even more power i.e. when Clark was testing out the Nostrum HPFP on a WRX. Maybe they just wanted to hold off for now since they're still testing everything out for now?

They experienced their issue with the Nostrum HPFP on their FA20. That made them hesitant to try it on the FA24.
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Old 09-03-2019, 08:28 PM   #23
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They'll be going with IBR's HPFP instead of Nostrum.
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Old 09-08-2019, 09:40 PM   #24
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i guess this means i should keep my eyes open for ascent longblocks
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Old 09-10-2019, 10:58 AM   #25
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Quote:
Originally Posted by WRXnick16 View Post
They'll be going with IBR's HPFP instead of Nostrum.
Everyone should, the pump quality is highly suspect for what they charge for one.
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