Welcome to the North American Subaru Impreza Owners Club Sunday December 15, 2019
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > FA Series Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 08-13-2019, 12:10 PM   #1
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

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). The car previously had a FA20DIT swap with 380whp.

Mods:
  • FA24DIT - OEM Ascent long block w/ ARP head studs
  • STI drivetrain
  • FP XR Blue HTZ ball bearing turbo
  • Killer B IWG header
  • Stock WRX ecu w/ Cobb AP
  • Cobb Flex Fuel Kit (stock injectors & HPFP)
  • Cobb EBCS
  • Cobb FMIC
  • Cobb Intake
  • Invidia J pipe
  • Custom catback
  • IAG AOS
  • IBR TGV delete & BRZ intake manifold adapter kit (not yet installed)
  • IBR HPFP (not yet installed)
  • Non-power related: OEM STI 19" wheels, STI Type RA Brembos & Recaro seats

Tuned by JR: 502whp/484 lb-ft @ 22.1psi before they ran out of fuel. They're still in the process of mocking up the IBR BRZ manifold kit. They'll also be installing IBR's HPFP.

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

Look at the monster torque on this thing. 300 lb-ft @ ~2800 rpm, 400 lb-ft @ ~3200 rpm, 480 lb-ft @ ~4000 rpm. Peak power (502 whp) @ ~6200 rpm (torque still at 420 lb-ft). I'm betting the IBR BRZ manifold kit will help carry the power a bit higher up. They commented that they limited the torque down low because they don't know the limits of the rods yet.

https://i.imgur.com/3LgmgL1.jpg

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 FA24 was designed as the SUV version. An STI version would hopefully have more potential with stronger internals (rods, pistons, etc.), more aggressive cams, better head flow, etc.

It'll be interesting to see how long things hold up, especially given the larger bore/pistons (94mm vs 86mm). At least they'll explore the limits and find the weak point for everyone else

Facebook Posts

* Registered users of the site do not see these ads.

Last edited by WRXnick16; 11-26-2019 at 09:36 PM. Reason: Updated with dyno chart
WRXnick16 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 08-13-2019, 02:22 PM   #2
mamock116
Scooby Newbie
 
Member#: 497678
Join Date: Feb 2019
Default

very cool, thank you for sharing.
mamock116 is offline   Reply With Quote
Old 08-13-2019, 03:19 PM   #3
Schoat333
Scooby Newbie
 
Member#: 452248
Join Date: Aug 2016
Chapter/Region: MWSOC
Location: Cleveland Ohio
Vehicle:
2017 Base WRX
WRB

Default

Thank you to whoever wrecked that Ascent, or did they buy the engine from Subaru? lol
Schoat333 is offline   Reply With Quote
Old 08-13-2019, 03:44 PM   #4
alapilusa
Scooby Newbie
 
Member#: 424692
Join Date: Jun 2015
Location: NJ
Vehicle:
2015 WRX
WRB

Default

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.
alapilusa is offline   Reply With Quote
Old 08-13-2019, 04:50 PM   #5
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

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.
WRXnick16 is offline   Reply With Quote
Old 08-13-2019, 06:00 PM   #6
jasonwrx86
Scooby Specialist
 
Member#: 472037
Join Date: Jul 2017
Chapter/Region: MWSOC
Vehicle:
2018 WRX Limited
CWP

Default

I want to see at least 350hp on the new STi with the 2.4L
jasonwrx86 is offline   Reply With Quote
Old 08-13-2019, 06:39 PM   #7
Stronkadonk
Scooby Newbie
 
Member#: 440207
Join Date: Feb 2016
Location: Detroit, MI
Vehicle:
2017 WRX
WRB

Default

Tbh might wait to build my broke ass car and see if the 2.4 can handle the power I want to achieve. 👀

Last edited by Stronkadonk; 08-13-2019 at 07:08 PM.
Stronkadonk is offline   Reply With Quote
Old 08-14-2019, 10:44 AM   #8
gn4rwhals
Scooby Specialist
 
Member#: 453427
Join Date: Aug 2016
Chapter/Region: MWSOC
Location: Detroit, MI
Vehicle:
2017 WRX
Crystal White Pearl

Default

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. 👀
Just E85 the FA20DIT and call it good, then buy this when it comes out.
gn4rwhals is offline   Reply With Quote
Old 08-14-2019, 11:59 AM   #9
WrightWRX
Scooby Newbie
 
Member#: 494418
Join Date: Nov 2018
Default

Thatís very neat. Looks like Iíll hold off on modding my FA20 more and wait to see what the FA24 can do.
WrightWRX is offline   Reply With Quote
Old 08-14-2019, 05:44 PM   #10
Straight6
Scooby Specialist
 
Member#: 419593
Join Date: Apr 2015
Default

Straight6 is offline   Reply With Quote
Old 08-14-2019, 09:06 PM   #11
blackseafleet
Scooby Newbie
 
Member#: 463024
Join Date: Feb 2017
Chapter/Region: SCIC
Location: los angeles
Vehicle:
2017 WRX
DGM

Default

sign me up. I was about to trade my wrx for a used crosstrek to fit my dogs. now I definitely want to.
blackseafleet is offline   Reply With Quote
Old 08-14-2019, 09:21 PM   #12
rexster
Scooby Specialist
 
Member#: 22863
Join Date: Aug 2002
Chapter/Region: MAIC
Location: The Land of Mary
Vehicle:
2015 WRX Premium CWP

Default

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. Theyíre not going to take the time to make forged internals or an 8k screamer engine for such a low volume car.
rexster is offline   Reply With Quote
Old 08-14-2019, 11:25 PM   #13
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

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. Theyíre 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.
WRXnick16 is offline   Reply With Quote
Old 08-14-2019, 11:54 PM   #14
Stronkadonk
Scooby Newbie
 
Member#: 440207
Join Date: Feb 2016
Location: Detroit, MI
Vehicle:
2017 WRX
WRB

Default

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 💀
Stronkadonk is offline   Reply With Quote
Old 08-15-2019, 09:31 AM   #15
gn4rwhals
Scooby Specialist
 
Member#: 453427
Join Date: Aug 2016
Chapter/Region: MWSOC
Location: Detroit, MI
Vehicle:
2017 WRX
Crystal White Pearl

Default

Quote:
Originally Posted by Stronkadonk View Post
I already maxed & surpassed the stock block's limits 💀
Nice.
gn4rwhals is offline   Reply With Quote
Old 08-23-2019, 12:42 AM   #16
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

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.
WRXnick16 is offline   Reply With Quote
Old 08-23-2019, 07:18 PM   #17
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

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 07:24 PM.
WRXnick16 is offline   Reply With Quote
Old 08-23-2019, 08:16 PM   #18
Straight6
Scooby Specialist
 
Member#: 419593
Join Date: Apr 2015
Default

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.
Straight6 is offline   Reply With Quote
Old 08-23-2019, 11:12 PM   #19
2slofouru
NASIOC Supporter
 
Member#: 90539
Join Date: Jul 2005
Chapter/Region: South East
Location: Lake Charles
Vehicle:
My BOV goes
COVFEFE!

Default

Direct injection is a major advantage.
2slofouru is offline   Reply With Quote
Old 08-25-2019, 12:00 PM   #20
Joey B 18c
Scooby Newbie
 
Member#: 472075
Join Date: Aug 2017
Location: Chicago
Vehicle:
2017 WRX
Black

Default

this is awesome! thumbs up to Prime
Joey B 18c is offline   Reply With Quote
Old 08-25-2019, 07:04 PM   #21
Stronkadonk
Scooby Newbie
 
Member#: 440207
Join Date: Feb 2016
Location: Detroit, MI
Vehicle:
2017 WRX
WRB

Default

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?
Stronkadonk is offline   Reply With Quote
Old 08-25-2019, 07:18 PM   #22
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

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.
WRXnick16 is offline   Reply With Quote
Old 09-03-2019, 09:28 PM   #23
WRXnick16
Scooby Specialist
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

They'll be going with IBR's HPFP instead of Nostrum.
WRXnick16 is offline   Reply With Quote
Old 09-08-2019, 10:40 PM   #24
dankor
Scooby Newbie
 
Member#: 460043
Join Date: Dec 2016
Default

i guess this means i should keep my eyes open for ascent longblocks
dankor is offline   Reply With Quote
Old 09-10-2019, 11:58 AM   #25
gn4rwhals
Scooby Specialist
 
Member#: 453427
Join Date: Aug 2016
Chapter/Region: MWSOC
Location: Detroit, MI
Vehicle:
2017 WRX
Crystal White Pearl

Default

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.
gn4rwhals is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 12:04 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.