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Old 07-19-2018, 09:39 AM   #1
awcforever
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Default Estimate HP with mods?

So Iím going to have my car dyno tuned in northern Va next month. I should have it done next week ready for tuning. I was just curious what kind of power I could expect conservatively. I donít want to burn it up or track the car. Just a fun daily driver.
Blouch 16g
Perrin boost valve
Perrin blow off
Greddy top mount
Perrin intake
STI pink injectors
Walbro 255 fuel pump
SPT exhaust
Perrin equal length header
Perrin down pipe
Perrin up pipe
15lb flywheel

I just finished the engine. I did factory MLS head gaskets, ARP studs, new timing belt with pulleys and tensioner. Cleaned and polished the heads no porting but it was nasty so I wanted peace of mind since it was out on the stand anyway.

All stock internals so Iíll be fairly conservative on the boost aspect. I asked a similar question in another thread but Iíve changed my configuration a bit.

I was just curious what you guys think. Could I push stock STI power reliably out of the ej20?
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Old 07-19-2018, 10:23 AM   #2
rtv900
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the dyno will most likely be inaccurately calibrated to provide 10-20% falsely high numbers like most tuner's dynos are, so yes you'll easily get over 300 hp at the wheels.
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Old 07-19-2018, 12:55 PM   #3
awcforever
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Quote:
Originally Posted by rtv900 View Post
the dyno will most likely be inaccurately calibrated to provide 10-20% falsely high numbers like most tuner's dynos are, so yes you'll easily get over 300 hp at the wheels.
Is that reliable though? Iíve read about tons of folks blowing their stuff up pushing high numbers. I work on A LOT of Subarus, but Iíve never pushed one to this extent. Itís not a lot of upgrades compared to some folks on here Iím sure, but I have the intention of taking it on road trips and commuting to work so I donít want any trouble if you know what I mean. The car was a repo that I chose to clean up and repair. It runs great with the mods but I donít want to assume the tune is good without a known shop confirming it. I have no clue what itís HP is as it sits but it was ridiculous before I pulled the engine to do the clutch. Even With the bad clutch it was insane to my standards, but i only drove it a handful of times after getting it running. The place is Mach V in sterling Va. Iíve heard good stuff about them.
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Old 07-19-2018, 03:38 PM   #4
snow_bound26
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Dyno numbers don't really mean much without a baseline. Dynos are good to see what increases your particular set up is making. Regardless of what numbers tell you it's going to come down to how good the work is and how you drive. You could push 400 with stock internals, baby it and be fine. You can kill it driving off the dealer lot with 5 miles on the OD if your drive like an a**. Seems like a 16g will be similar to a "stage 2" STi
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Old 07-19-2018, 04:16 PM   #5
awcforever
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Originally Posted by snow_bound26 View Post
Dyno numbers don't really mean much without a baseline. Dynos are good to see what increases your particular set up is making. Regardless of what numbers tell you it's going to come down to how good the work is and how you drive. You could push 400 with stock internals, baby it and be fine. You can kill it driving off the dealer lot with 5 miles on the OD if your drive like an a**. Seems like a 16g will be similar to a "stage 2" STi
I understand that, Iím not a crazy driver but I have the seldom urge to whip down a curvy road or toy around from stop light to stop light every now and again. Iím at 140k miles on the clutch in my Legacy so I wouldnít say Iím too harsh. Im mostly hoping that with the mods and some regular fun driving I donít have to worry to much about throwing a rod or wiping a cam or anything. Iíve heard the cars are fairly robust but at the same time you are right. Out of all the horror stories Iíve heard who knows what got them to that point whether they were beating the hell out of the car trying to run 40psi or if they babied it. Who knows? I do love my Soobys tho. This will be the 3rd one currently sitting in the driveway and I donít know how many Iíve bought, rebuilt, and sold. Itís been a lot, but nothing aspirated which is why I have concerns. WRX issues cost a whole lot more than all the N/A Soobys Iíve put together.
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Old 07-19-2018, 04:24 PM   #6
snow_bound26
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Had 215k on my clutch when I replaced it. I don't do light to light but I love curvy roads and do occasional track days. You can have fun with a car without being an idiot with it. My point was more weighing one persons experience to another only gives you so much real information because every one that rolls out of the factory is somehow different yet the same. Regular maintenance is the key. Using proper fluids and not cheating out. Don't go over the recommended mileage. Stuff like that. I worry about spinning a bearing. But I know how to decrease the likelihood without treating the car like is going to fall apart. Hell, I have 230k on the original turbo. The tuner was amazed. But I have a VF34 waiting to go in now as well.
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Old 07-19-2018, 08:47 PM   #7
awcforever
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Quote:
Originally Posted by snow_bound26 View Post
Had 215k on my clutch when I replaced it. I don't do light to light but I love curvy roads and do occasional track days. You can have fun with a car without being an idiot with it. My point was more weighing one persons experience to another only gives you so much real information because every one that rolls out of the factory is somehow different yet the same. Regular maintenance is the key. Using proper fluids and not cheating out. Don't go over the recommended mileage. Stuff like that. I worry about spinning a bearing. But I know how to decrease the likelihood without treating the car like is going to fall apart. Hell, I have 230k on the original turbo. The tuner was amazed. But I have a VF34 waiting to go in now as well.
Heck yeah man! Nice! Weíll see I guess. He was a bit surprised I wanted to tune it as it ran great when I got it running, but I donít know who tuned it or what software they used so after pulling the engine i was basically hell bent on making sure everything is in line. Hopefully after they go through everything, clean up the tune and delete the TGV codes it will be where I want it. They said it will be $600 for a flash, open source tune, and 5 dyno runs with printouts, doesnít seem like a bad deal to me. Hopefully I can hangout and watch it all. I never messed with the tuning software like rom Raider or whatever theyíre going to use but I am big into EFI live and working on diesels so hopefully over time I can get into it a bit and help others
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Old 07-19-2018, 09:02 PM   #8
snow_bound26
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That's a pretty standard price it seems. Though I don't like it when a tuner puts a specific number of dyno runs on the price. Do it till it's done. Doesn't matter if it's 3 runs or 8. But a good tuner can get to the root of things quickly. Good luck with it all. Treat it right and it will last.
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Old 07-20-2018, 02:01 PM   #9
mrsaturn7085
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Those injectors max out around 315 whp. Save yourself time later and only the parts that matter:

Blouch 16g
STI pink injectors
Walbro 255 fuel pump

Then again, posting 'how much will I make' threads is discouraged on this board. Get it tuned and you tell us - people will quickly tell you if your choice of tuner was bad.
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Old 07-23-2018, 10:49 AM   #10
awcforever
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Okay guys, so the 16g that I was told was in the car is not correct. I ran the numbers on the housing and took some measurements. I know its a 20g and I believe a td05 housing. I added this to another thread I made for the build in this forum so you guys can go there to hit me up if you want. I'm hoping that turbo can be tuned to last but thats fairly sizable, not sure how I feel about that.

Here is the link to my other ongoing thread. Enjoy!

https://forums.nasioc.com/forums/sho....php?t=2872063
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