Anyone know anything about '15 wrx's?
 

Hi all,

This isn't a thread about why my car wasn't faster, just curious of the mods that the other guy had. By looking at his car he has a newer wrx. It has an sti wing but I think it was just added to wrx. Wheels weren't an sti's. I noticed a little afterfire coming from his exhaust at a red light. Might have sounded like some after market components in there. The only power and supporting mods I have are hpfp, cs intake with tip, mounts, and CPE tmic tuned by stratified OTS+. Getting on the interstate we both went wot at about 50mph and he didn't pull on me but I also didn't gain on him. Dead even. After research they have about the same crank hp as us but lower whp due to loss from awd. The only thread I found on here was from a guy that just got back from deployment and was untuned. Not but hurt by any means, just curious if anyone knows anything about that platform


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Speculating maybe STI. Or a bolted WRX. Still seems like you should have pulled at least by a little on him. Seems like you and I have similar mods but I have an E30 OTS tune from stratified, and a catback/catless test pipe. With that I pulled 2 car lengths on a Ecoboost Mustang which has more power.

So I think this is a driver mod issue, or he's secretly bolted/tuned. No way you should be seeing after fire on a stock WRX. Have you tried getting some numbers from VDyno?

No not yet I will though. Driver mod could be a factor if it was from a dig, but rolling and going, less to fuck up. Only shifted once then looked down and realized I was going over 100. From what I've researched those cars don't need an intake due to the oem performing well. The engine has a problem with heat so that's one of their first issues to fix. Exhaust and tune do well for them. I hope that it was an sti. Also I'm going to get corn in my diet after my tbe. That alone is worth around 20-30whp. Thank you for your reply


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Nice on the stang. Aren't they rated a little north of 300 at the crank?


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310 I think it was thanks. Get some corn man it makes a he'll of a difference. My VDyno numbers in my sig are not accurate anymore, I'm at like 284/313 after a few more runs, and those are the numbers I took the Mustang with.

Then you won't have to worry about STis after that ;)

2015+ WRX's with just E85 and a tune will have significantly more wheel horsepower than most fully bolted stock turbo MS3's thanks to their twin-scroll turbo. Power-wise, they respond to modifications much better than the current STI. Don't underestimate them, they are significantly faster than their predecessors in every aspect.

Damn do those FA20s hold up? Not familiar with their internals and what not but I've only heard they are more durable than the STI, but not capable of a whole lot. From the very minor browsing around researching them I did a while back.

@MD1032 thank you. If you know this first hand then good for them, but I have been reading that the engine is only good for 300ish hp and everyone on the forums are saying to just buy an sti. Upgrading a WRX isn't worth it. I'm not trying to discredit you in any means just relaying my ignorant knowledge. I still think it's a good platform, I have a lot of respect for them. Looks like I might be going bt after all. While on this subject though; on paper having a bt might be more reliable due to not having as hot of air being pushed out at the same psi right? Also I think I read that the psi on the k04 and the same psi on a bt will be different?


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You think that Subaru in 2015 can't make an engine that's stronger than the DISI MZR which dates back to 2005?

Well thank you for putting me in my place. That is impressive. And just an after thought it was a WRX. I didn't hear the distinctive rumble due to the unequal length exhaust manifold


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Bigger turbos flow more air than the K04, therefore at the same PSI let's say 20psi the bigger turbo will be pushing much more air. So if it takes 20 psi to make 300hp with the K04, it will take like 16psi on a bigger turbo for the same results.

Thank you for spoon feeding me the info I vaguely remembered. Thank you for all your knowledge


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Damn that's impressive.....maybe I'll make that my next car.

But how much for all those mods? Complete turbo systems are around 4500. AP 600. TBE 1200. FMIC 1200. That's around 8k worth of mods. I could be wrong and I'm not hating but with that money on our platform we can achieve similar.


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Shit I didn't notice it had an aftermarket turbo on there. Impressive nonetheless considering the numbers on a stock block. Now I really may consider getting one.

Our platform is dated, but holds up nicely if done right, so it's no joke. Just seems like going past 350tq starts to go beyond "safe"

My intent was only to show that the stock block was capable of supporting high power and torque. I'm sure that is an expensive setup, especially coming from ETS.

^ Heard that! I'm sure they will push their platform further in the future and learn their weaknesses as well


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The fa motor is pretty good. My brother has a 15 wrx and it was very close when i had a cs sri, full catless tbe and a ap, he was bone stock. I was pretty impressed. With minor bolt ons and e85 theyre making in the 300s whp.

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Absolutely not true. lol Shift points are extremely important.

On an OTS map, the power above 6k is still sort of there, but if you ever look at a factory MS3 dyno, its absolutely horrendous above 5700. Yet, you will see that a ton of people are still revving them all the way out to redline anyways.

I use to shift right around 6k or so until I raced David. He showed me the power up top for an E85 tune is still worth revving out to. Both cars making 330whp, and I actually had 20 more torque. Granted his car was stripped, it was pretty obvious that the later shifts were making a difference. I've been revving higher ever since. lol

I have my shift light set to 5500


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I think I shift right around 6k lol, to be honest I go by feel and usually its around 6k. I wish it had more oomph going past 5500 even on E85 mix.

I just looked at my dyno sheet, and I don't start to go under 300 whp until after 6500. Just FYI...

Sometimes better gearing with less HP is more than slightly more HP in a higher gear.

Hmm, looking at my Vdyno charts, seems to hold well right up until 6k then drops off pretty quickly, its not consistent to every log though, on some it holds out up to 6200. Could be the tune, since mine is just OTS, and not a full custom etune.

Yeah, lol. Minor detail.