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Old 01-12-2015, 07:54 PM   #1
toph
Scooby Specialist
 
Member#: 78640
Join Date: Jan 2005
Chapter/Region: NESIC
Vehicle:
08 STi 3.5XT-R
15 STi CWP | 02 STi Wagon

Default 2015 STi | Stage 1 Protune | BrenTuning

Car: 2015 STi
Tuner: Brendan @ BrenTuning
Dyno Info: Mustang MD150AWD
Transmission: 6-Speed
Gear: 3rd
Peak HP at RPM: 271WHP @ 5400RPM
Peak Torque at RPM: 301WTQ @ ~3900RPM
Baseline HP/TQ for stock on same dyno: 236WHP/219WTQ
Target Boost: 19PSI
Target AFR: ~11.3 tapering to 11.0
Fuel: 93 Octane

So as many of you may know, I traded my '15 WRX for a '15 STi. I have been met with many questions as to why and my reasoning behind the switch. There were quite a few reasons why I decided to make the change, but mostly due to the fact that I just didn't find the WRX entertaining to drive. I know I will be met with lots of flack for this opinion, but what I look for in a car is an engaging drive and the WRX did not provide me with that. I looked at the WRX as a point A to point B car not an experience (as tacky as that sounds). While that is the cars main purpose, I spend a lot of time driving and want something that is engaging and entertaining.

I was the first '15 WRX that Bren Protuned and the numbers were impressive for zero modifications (thread: http://forums.nasioc.com/forums/show....php?t=2662064). The stage 1 Protune transformed the car immensely, but it still wasn't the engaging driver I was looking for. I drove the car for a few months thinking about what I was going to do. After mulling over many different (non-Subaru) options, I finally contacted Gary from Manchester Subaru to see if they had any STi's on the lot or any in transit. He told me he had a cancelled order with exactly what I wanted (CWP base with H&K/Nav/Keyless). I put a deposit on that same day and a month or so later traded my '15 WRX Limited 6MT is for a '15 STi. Pulling out of the lot, I immediately knew I made the right decision.

Being the enthusiast and Subaru whore that I am, I knew the car wouldn't stay stock forever. I already had the AccessPort from the '15 WRX which I won at WBM, so that transferred right over. I contacted Bren and set up a time for him to Protune the STi. I went there last Friday and got the car on the dyno with 1450ish miles on the clock. Baseline was lower than I expected, but the gains were awesome. I actually never even flashed Cobb Stage 1 to the car so I don't have that for driving comparison, but we did baseline that as well. The numbers were:

Stock: 236WHP/219WTQ
Cobb V340: 253WHP/277WTQ
Protune: 271WHP/301WTQ

Impressions and comparisons:

Like the WRX, the car pulls great through all the gears and is a massive improvement over OEM mapping. The car is noticeably less "twitchy" in sport and sport sharp which was my biggest complaint about the OEM map. The power dip around 4000RPM is gone and the car pulls hard to redline with minimal drop off unlike the FA powered WRX. Spool is great and the power comes on quick and stays until the end which makes it much more fun to drive. If you compare my WRX and STi, the STi actually spools quicker (atleast as what shows on the dyno). People are always talking about the massive spool improvements of the low-mounted twin-scroll FA vs the "old" EJ. On the street the difference is negligible. As you can see on the graph, the biggest gains are to be found in the mid range where there is almost 120WTQ in gains at 3800RPM over OEM mapping! At 4100 the car is making 70WHP more! This translates to a car that is infinitely more fun to drive around town. There was more power on the table, but I asked Bren to take it easy on her since there have been some spun bearing cases, also since I will be modifying further, it isn't a big deal to not fully maximize the potential at this point. I also have a 440WHP (tuned by Bren) GR so while this car isn't "fast" by comparison, it is very fun and faster than the WRX, perfect for a DD .

As for future plans, obviously I can't leave good enough alone. For power mods, I will be adding a downpipe, Cobb intake, KillerB header and Grimmspeed EBCS. I will probably drive the car like this until spring and then start by adding the DP and later the header and intake. I am going to order Racecomp Yellows and maybe a rear sway bar. This car is the perfect DD and a great compliment to my GR STi which is a bit too finicky and quick to drive every day.

I don't want this thread to turn into a FA vs EJ contest, I am just stating my opinion on both of them. I think the FA is a great platform and is perfect for 90% of owners, but for me the STi is a perfect blend of power, handling, engagement and looks. I am finally happy.

Contact info:

BrenTuning
377 Worcester Rd
Charlton, MA

Phone: (508) 762-1769
Email: sales@brentuning.com

Bren will dyno or e-tune the car, obviously best gains with a dyno tune. Give him a call or email for package deals and pricing!



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Old 01-12-2015, 08:06 PM   #2
ColdSoda
Scooby Specialist
 
Member#: 200545
Join Date: Jan 2009
Chapter/Region: SWIC
Location: Phoenix, AZ
Vehicle:
2002 Subaru WRX PSM
2015 Subaru WRX ISM

Default

hell yeah man. good post, Bren is really doing a lot of impressive work on the 15s. keep us posted with the modding... I'll be watching it for sure lol
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Old 01-13-2015, 11:59 AM   #3
Jason2015wrx
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Member#: 392507
Join Date: Jun 2014
Chapter/Region: RMIC
Location: Lakewood, Colorado
Vehicle:
2015 WRX
CBS

Default

I am about to get my WRX tuned AP/Pro tune, I wanted the STI as well but wanted the FA. I hope the STI gets a FA in the next 3 years as my lease will be up so my plan is to get the STI in 3 years....

Did you feel the Protune on the WRX was faster then the STI stock before you tuned it? I probably fit into the 90% of the drivers but I am just curious your thoughts. I may end up going E85 honestly because we only got 91 octane here in Colorado...
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Old 01-13-2015, 12:05 PM   #4
unamuzedwrx
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Member#: 287794
Join Date: Jul 2011
Chapter/Region: South East
Location: NC
Vehicle:
2015 Wrx
DGM

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How much did the trade set you back? Did the dealer give you a good price on the STI and trade in?
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Old 01-13-2015, 01:18 PM   #5
toph
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Member#: 78640
Join Date: Jan 2005
Chapter/Region: NESIC
Vehicle:
08 STi 3.5XT-R
15 STi CWP | 02 STi Wagon

Default

Quote:
Originally Posted by ColdSoda View Post
hell yeah man. good post, Bren is really doing a lot of impressive work on the 15s. keep us posted with the modding... I'll be watching it for sure lol
For sure. He does a lot of great work with many different makes and models, Subaru is no different. Go on his site and look at the dyno database of some of the other cars he tunes!

Quote:
Originally Posted by Jason2015wrx View Post
I am about to get my WRX tuned AP/Pro tune, I wanted the STI as well but wanted the FA. I hope the STI gets a FA in the next 3 years as my lease will be up so my plan is to get the STI in 3 years....

Did you feel the Protune on the WRX was faster then the STI stock before you tuned it? I probably fit into the 90% of the drivers but I am just curious your thoughts. I may end up going E85 honestly because we only got 91 octane here in Colorado...
The WRX felt a bit slower, although it may be the additional torque of the STi that gives me that feeling. Both cars were dramatically improved in reponse, if you compare the two graphs the spools is almost identical. Everyone praises the quick response of the low-mount twin-scroll FA, but I honestly don't notice a difference on the street. Maybe a couple hundred RPM if that? On the dyno the WRX peaked later than the STi. E85 is a great option, but we don't have that readily available here. Plus you'll have to switch maps every once in a while to keep the HPFP from gumming up.

Quote:
Originally Posted by unamuzedwrx View Post
How much did the trade set you back? Did the dealer give you a good price on the STI and trade in?
They gave me $28K for the car with 14,500 miles. I paid right around $31K for it + TTL obviously. That was a limited/nav/6MT car. I got a better deal on the WRX than STi, but the STi was a cancelled order with literally everything I wanted (CWP, Nav, Keyless). I could have probably got an extra few hundred off the price but I just wanted out and into an STi. Think I paid like $1500 under MSRP. I bought both cars from Gary at Manchester Subaru in NH and will continue to buy my cars from him, super easy to deal with.
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Old 01-13-2015, 03:50 PM   #6
Jason2015wrx
Scooby Specialist
 
Member#: 392507
Join Date: Jun 2014
Chapter/Region: RMIC
Location: Lakewood, Colorado
Vehicle:
2015 WRX
CBS

Default

Quote:
Originally Posted by toph View Post
The WRX felt a bit slower, although it may be the additional torque of the STi that gives me that feeling. Both cars were dramatically improved in reponse, if you compare the two graphs the spools is almost identical. Everyone praises the quick response of the low-mount twin-scroll FA, but I honestly don't notice a difference on the street. Maybe a couple hundred RPM if that? On the dyno the WRX peaked later than the STi. E85 is a great option, but we don't have that readily available here. Plus you'll have to switch maps every once in a while to keep the HPFP from gumming up.
Hmmm.... Yea I feel I wont be happy if I cant get my WRX to at least stock STI performance... I have been looking at BrenTuning and The Boost Creep in Colorado.. There is a lot more buzz on this Forum about BrenTuning for sure.

Harvey told me he got baseline Dyno on Stock cars at.
15 WRX 210
15 STI 225

Protune on WRX
91 Octane 247 (Which on paper is better then STI)
E85 310/340 Tq

I im about 60/40 on E85 and just switching maps every know and then... Seems like the problem they have had in the past is the Fuel Pump.
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Old 01-14-2015, 01:57 PM   #7
BrenTuning
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Member#: 287454
Join Date: Jul 2011
Chapter/Region: NESIC
Location: Metrowest Boston
Vehicle:
E92 M3
630whp / 424wtq

Default

Quote:
Originally Posted by Jason2015wrx View Post
I am about to get my WRX tuned AP/Pro tune, I wanted the STI as well but wanted the FA. I hope the STI gets a FA in the next 3 years as my lease will be up so my plan is to get the STI in 3 years....

Did you feel the Protune on the WRX was faster then the STI stock before you tuned it? I probably fit into the 90% of the drivers but I am just curious your thoughts. I may end up going E85 honestly because we only got 91 octane here in Colorado...
we are going to do a comparison thread of all Toph_R cars both 15 wrx and 15 sti and he can give you a low down on the driveability comparison.
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Old 01-14-2015, 01:59 PM   #8
Jason2015wrx
Scooby Specialist
 
Member#: 392507
Join Date: Jun 2014
Chapter/Region: RMIC
Location: Lakewood, Colorado
Vehicle:
2015 WRX
CBS

Default

Quote:
Originally Posted by BrenTuning View Post
we are going to do a comparison thread of all Toph_R cars both 15 wrx and 15 sti and he can give you a low down on the driveability comparison.
Sounds great! looking forward to seeing it
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Old 04-22-2015, 10:40 AM   #9
Nitrous
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Member#: 136929
Join Date: Jan 2007
Location: NY
Vehicle:
2007 2.5i
Satin Jizz Pearl

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Awesome post! I too was torn between the '15 WRX or STi but ended up with the latter
I understand your sentiments 100% in terms of "the experience"
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