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Old 01-02-2017, 04:21 PM   #1
TopSpeed
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Default TopSpeed Motorsports | 2015 STi 403whp/453wtq on stock turbo

Car: 2015 STi
Location: TopSpeed Motorsports, Alpharetta GA
Tuner: Taylor at TopSpeed Motorsports
Dyno: Dynojet linked AWD
Transmission: Stock 2015 6-speed
Gear: 3rd
Peak hp at rpm: 403whp @ 4,860 rpm
Peak tq at rpm: 453wtq @ 4,260 rpm
Baseline for stock STi: 2015 STi 245whp/250wtq
Target boost: 21 psi tapering to 16 by redline
Fuel: E85

400whp stock turbo STi?! Yes, you read that right. This 2015 STi was brought in by a member for us to look over a few things and then get it on the dyno for a flexfuel tune. This is basically a full bolt on car that is completely ready for a larger turbo (or built motor and larger turbo ) With the mod list it has, I knew it was going to do well, but I really didn't expect what we ended up getting out of it.

Mod list consisted of the following:

Stock VF48 turbo
ETS Intake
ETS FMIC
TGV Deletes (we believe, stock TGV housings)
Tomei EL header
3" turboback exhaust
Tial 38mm external WG (14.5 psi spring)
3-port EBCS
Inejctor Dynamics 1000cc injectors
Cobb FlexFuel with FPR

Tuned via Cobb AP V3

E85 - 21 psi peak: 403whp/453wtq



93 - 19 psi peak: 354whp/393wtq



We were very impressed at the results and how well the setup worked on the car. We typically see in the 355-365whp range on E85 stock turbo 2015+ STi's, with the highest before this one being 375whp. As for 93 numbers, we usually see in the 310-320whp range. I've always been a huge fan of EL headers and FMIC on these cars, as well as EWG and TGV deletes, and this car showed that even at the stock turbo level they can be very beneficial!

As for the dyno graphs, since we are still working with limited airflow from the stock turbo, the power falls off to about where most stock turbo 2015+ STi's end up in the high rpms. The customer mentioned that he plans to upgrade to a larger stock location turbo in the spring, not so much to add a ton of peak power, but to hold the power all the way to redline so the car will be faster while maintaining the same or slightly less peak torque to keep everything happy.

Thanks for looking!

-Taylor

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Old 01-02-2017, 05:55 PM   #2
Frank 17 STI
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Impressive to say the least. Excuse my lack of knowledge but isn't that pushing it on the stock block?
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Old 01-02-2017, 06:08 PM   #3
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Quote:
Originally Posted by Frank 17 STI View Post
Impressive to say the least. Excuse my lack of knowledge but isn't that pushing it on the stock block?
This is about as much torque as I would ever usually push on the stock block. You can see I limited it a bit in the real low rpms to eliminate the shock as much as possible. As for 400whp, I have had many EJ's live a long time at 400-430whp, even at 450+whp if it can be made more in the hogher rpms rather than mid range.

-Taylor
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Old 01-02-2017, 07:54 PM   #4
Frank 17 STI
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Originally Posted by TopSpeed View Post
This is about as much torque as I would ever usually push on the stock block. You can see I limited it a bit in the real low rpms to eliminate the shock as much as possible. As for 400whp, I have had many EJ's live a long time at 400-430whp, even at 450+whp if it can be made more in the hogher rpms rather than mid range.

-Taylor
Good to know Taylor. Thanks for the quick education. Keep up the great work!
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Old 01-03-2017, 03:58 PM   #5
subaru_gc8
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Why did you use red gear instead of fourth? I though fourth on the 6 speed was the norm?
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Old 01-03-2017, 07:04 PM   #6
BadSubby
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Nice wheels and stats!
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Old 01-04-2017, 11:32 AM   #7
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Originally Posted by subaru_gc8 View Post
Why did you use red gear instead of fourth? I though fourth on the 6 speed was the norm?
I do 3rd gear on all of the lower hp cars (lower being a relative term). Even with the super short gears of the STi I always feel like I'm lugging the hell out of the cars at the sub-400whp level doing single gear pulls for 10+ seconds lol. Spool will look a little quicker in 4th and the cars usually make slightly ore tq and hold boost up top a little better, but its a very small difference.
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Old 01-04-2017, 11:55 AM   #8
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I found these comparisons interesting. First is a 2015 STi on E85 but with stock header, TGV's, and stock TMIC. This was the highest whp stock turbo STi we had on the dyno before. It was on a stock clutch so I kept the torque just a little conservative which may have taken away a slight bit in the mid range, but it was about out of breathe anyways.



The second comparison is against a stock motor STi with a 20G, although it was a single AVCS car, but the power numbers were similar so it is a good visual on the difference of how one carries power much farther into the rpms. There is a 40-45whp difference in the higher rpms.

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Old 01-04-2017, 04:13 PM   #9
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ok i need to ask... whats with the stacks of cars on shelves in the background of all your pics? car storage or something?
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Old 01-05-2017, 10:07 AM   #10
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Quote:
Originally Posted by Titter View Post
ok i need to ask... whats with the stacks of cars on shelves in the background of all your pics? car storage or something?
Those are where we put the cars that are not currently being worked on, but are on the build wait list, or waiting for parts/funding/etc. We have 2 lifts that are 3 cars tall which makes it nice to not clutter up the rest of the shop. We already have all 5 lifts full with cars being worked on and about 12-15 cars we move in every night and out every morning depending on the amount of cars we are working on at any given time, so we had to get creative with space!

-Taylor
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Old 01-05-2017, 07:51 PM   #11
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that makes perfect sense. sorry for the weird question, im just curious about stuff like that.

i enjoy the info you guys post. thanks for sharing.
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Old 01-08-2017, 09:22 PM   #12
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Wouldn't a 3rd gear pull show better numbers than the traditional 4th gear pull? Correct me if I'm wrong but the ratios of the gears effect power put down. No offense its like saying we made 760hp/tq in 1st gear
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Old 01-08-2017, 09:46 PM   #13
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Originally Posted by silversurfer05 View Post
Wouldn't a 3rd gear pull show better numbers than the traditional 4th gear pull? Correct me if I'm wrong but the ratios of the gears effect power put down. No offense its like saying we made 760hp/tq in 1st gear
He stated it was a 3rd gear pull.
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Old 01-09-2017, 11:04 PM   #14
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Quote:
Originally Posted by Frank 17 STI View Post
He stated it was a 3rd gear pull.
I know. Im saying 4th would show more comparable numbers due to drive train multiplication
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Old 01-12-2017, 11:46 AM   #15
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Quote:
Originally Posted by silversurfer05 View Post
Wouldn't a 3rd gear pull show better numbers than the traditional 4th gear pull? Correct me if I'm wrong but the ratios of the gears effect power put down. No offense its like saying we made 760hp/tq in 1st gear
Like I mentioned earlier, doing a pull in a longer gear will help the car spool faster and hold a little more boost up top due to the additional load, and usually make slightly more tq in 4th vs 3rd, but the overall power doesn't change. Maybe on old dyno's where you really needed to get to that 1:1 gear ratio. On the GTR's we have done 3rd, 4th, and 5th gear pulls back to back on big power gains with no difference in power figures. Hell sometimes for testing we do 3-4-5 pulls just going through the gears when we are testing certain products. The graphs look funny, but the peak power in each gear is the same.
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Old 01-12-2017, 08:25 PM   #16
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Nice build
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Old 01-12-2017, 10:14 PM   #17
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Quote:
Originally Posted by silversurfer05 View Post
I know. Im saying 4th would show more comparable numbers due to drive train multiplication


Gearing is usually accounted for in the settings. Most dynos are OBD2 or RPM calibrated. It knows the RPMs per roll of the drum. The same way virtual Dyno scales when you tell it the proper gear and tire size.

Even if you had 2 cars that were in 4th near 1:1 the rear end could still be wildly different. 3.10 vs 4.54. Same goes for tire size.

Other than load as top speed pointed out there would be very little difference. Peak numbers won't change much at all. Curve may look a little different as spool will come sooner. Honestly it doesn't really matter. Low horsepower cars it just tends to be easier.
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Old 01-15-2017, 10:05 PM   #18
silversurfer05
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Quote:
Originally Posted by ericdet View Post
Gearing is usually accounted for in the settings. Most dynos are OBD2 or RPM calibrated. It knows the RPMs per roll of the drum. The same way virtual Dyno scales when you tell it the proper gear and tire size.

Even if you had 2 cars that were in 4th near 1:1 the rear end could still be wildly different. 3.10 vs 4.54. Same goes for tire size.

Other than load as top speed pointed out there would be very little difference. Peak numbers won't change much at all. Curve may look a little different as spool will come sooner. Honestly it doesn't really matter. Low horsepower cars it just tends to be easier.
Thanks for clearing that up for me! Im uneducated on dynos obviously lol
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Old 02-04-2017, 09:45 PM   #19
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Looks like mine, with a lot more power! It's nice to see some people doing the work these new ones to see what the new VF48 turbos are capable of. I'm looking forward to building mine. Nice work.
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Old 02-06-2017, 10:24 PM   #20
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dont listen to that taylor he doesn't know much about subarus ahahaha jk mah brotha **** u know this site more than I am.
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