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Old 01-20-2009, 01:48 PM   #1
GRD Tuning
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Default GRD Performance 08 Sti Shop Car Build

After having put a little over 2200 miles on our shop 2008 Subaru STi we felt it was time to load our vehicle on our 4wd Dynapack Dyno to take some base line pulls. This enabled us to have a reference point of where we started with stock wheel HP figures over any future performance modifications. Subaru rates the crank HP at 305 and torque at 290 lb-ft, and our shop/test car managed to pull a best of 234 WHP and 280 lb-ft. This is about 5-7 WHP less than our previous 2005 STi which was rated 5 HP less from the factory than our current car! Below are the results of the 2 best baseline pulls that our car could manage.



After taking care of our baseline pulls we decided to install a Cobb Accessport. We married it with their Stage one 93 octane calibration. The OTS map provided with the Accessport made 278WHP at 5250 rpms and 317 lb-ft at 3700 rpms. Results are shown below along with our stock baseline as a reference.



With some minor tweaking using Cobb’s Protuner software we were able to make some slight gains, and deliver an extra 10-15 lb-ft torque throughout the rev band peaking at 291 WHP.



While increasing HP and Torque over stock and Cobbs OTS Stage 1 map we were also able to increase our MPG by 5-10 percent. This was helpful on our wallets during the time when gas was over $4.30/gallon for 93 octane fuel.

For our next modification we fitted an Invidia downpipe, an HKS catback exhaust and an AEM Cold air intake system.
We did some baseline pulls with Cobbs Stage 2 OTS map and yielded 305 WHP and 352 LB/FT. After our custom tune we were able to extract 8 WHP and 5 LB/FT of torque.



On pump gas our 08 STi managed to make an additional 77 WHP and 67 lb/ft of torque over stock, with some bolt-ons and custom tuning. So far it has adapted very well to the additions we have made and served as a fun daily driver. Drivability remains great and is much smoother throughout the rev band and throttle position. Throttle response has also been finely tweaked to give better drivability.

Our next stage was to fit a larger turbo but one that would not negatively affect any daily drivability, and our answer was the APS SS45. A very cost affective turbo for those looking for more HP without giving up any throttle response or low end torque.

Throughout the testing and dyno tuning on our stage 2 setup we found that the stock injectors would not support a large turbo application so we proceeded to install 850cc injectors with the SS45. The stock fuel pump was adequate for this setup but we will upgrade it in the near future. We felt the stock topmount intercooler was also sufficient for this setup. However, after numerous hours of street and dyno tuning we concluded that we need a more free flowing exhaust to maximize the potential of the SS45. Back pressure for the HKS exhaust measured at an astounding 4.5psi at 20psi of manifold pressure. We believe this to be comparable to the stock exhaust and should have some data shortly. Those looking for a stealth system which makes 350whp with 93 octane with better street/autocross drivability than stock should look no further.




Keep a lookout for our updated thread as we will eventually move to larger turbo and built motor setup.
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Old 01-20-2009, 03:06 PM   #2
GrimmSpeed
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Cool build so far, post some pics!!

Mike
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Old 01-20-2009, 03:13 PM   #3
GRD Tuning
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thanks, the car is filthy right now (chicago winter ftl). I'll take some pics when i get it cleaned up.

-irf

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Originally Posted by GrimmSpeed View Post
Cool build so far, post some pics!!

Mike
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Old 01-20-2009, 04:25 PM   #4
LITE SPD
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I recently had my 2008 WRX sedan dynotuned at GRD. Very impressed on how they handled me. The were able to get me scheduled for an appointment in 3 hours of me calling them. Were very professional and knowledgeable. Super clean showroom and they had me playing Call of Duty 4 on thier Xbox while I waited for the tune.

My brother has an 08 STI and will be having the same mods done soon at GRD. Great results!
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Old 01-20-2009, 05:18 PM   #5
Damon
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very VERY nice way you guys have shown all the dynos.
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Old 01-20-2009, 10:32 PM   #6
Pearl_White_Sti
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Nice Numbers, I need to drive it now
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Old 01-20-2009, 11:59 PM   #7
n2oiroc
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im shocked at how much the stage 1 flash helped! my 07 sti felt like it picked up 10 whp at most when i tried it.
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Old 01-21-2009, 03:38 AM   #8
Iflysti06
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Was amazed with the stg.1 and stg.2 results but thought the ss45 would a put down a lil more hp then that, but thanks again for the great writeup!
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Old 01-21-2009, 09:27 AM   #9
Paul
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Looks like Cobb ots maps got alot better!!
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Old 01-21-2009, 11:35 AM   #10
GRD Tuning
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We do our best to accommodate and i'm glad we were able to take care of you. Let me know when your brother is ready to come down

Quote:
Originally Posted by LITE SPD View Post
I recently had my 2008 WRX sedan dynotuned at GRD. Very impressed on how they handled me. The were able to get me scheduled for an appointment in 3 hours of me calling them. Were very professional and knowledgeable. Super clean showroom and they had me playing Call of Duty 4 on thier Xbox while I waited for the tune.

My brother has an 08 STI and will be having the same mods done soon at GRD. Great results!
We feel that the current exhaust setup is a limiting factor. We are upgrading to a full 3" and will get some numbers up when we are ready to do so.

Quote:
Originally Posted by Iflysti06 View Post
Was amazed with the stg.1 and stg.2 results but thought the ss45 would a put down a lil more hp then that, but thanks again for the great writeup!
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Old 01-21-2009, 02:51 PM   #11
GRD Tuning
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Actually, I should have clarified. The stage 2 graph above is with an exhaust and an AEM intake (which requires tuning).

The graph below is Cobb's STG 2 OTS map with a stock intake.



Quote:
Originally Posted by Paul View Post
Looks like Cobb ots maps got alot better!!
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Old 01-21-2009, 07:46 PM   #12
MattPersman
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is Tim Bailey doing the maps for the APs now?

anyways nice work, are you a full service shop and do you do open source tuning, what type of dyno? if so I might hit you up in the future
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Old 01-22-2009, 11:46 AM   #13
GRD Tuning
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Default

Matt,

I have heard that Tim is doing AP maps but have not confirmed it.

We are a full service shop with a 12,000 sq. foot facility in the suburbs of Chicago. We do offer open source tuning, and i'll send you a pm with the info. We use a dynapak dyno. Let me know if you have any other questions

-irf

Quote:
Originally Posted by MattPersman View Post
is Tim Bailey doing the maps for the APs now?

anyways nice work, are you a full service shop and do you do open source tuning, what type of dyno? if so I might hit you up in the future
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Old 01-22-2009, 12:00 PM   #14
Rudywrx04
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Looks good GRD! Keep up the good work.
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Old 01-22-2009, 12:23 PM   #15
pauli18c
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just curious, what do 05 Sti baseline at? 240, if i read that right?

got my car tuned by you guys last january and put down about 360whp and you said you could get about another 20 out of it with summer gas, but couldnt justify bringing it back and paying for another tune.
been running great, and no complaints
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Old 01-22-2009, 02:08 PM   #16
slovak
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looks healthy and is making really good HP. So when are you going to add the APS equal length header???
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Old 01-22-2009, 03:51 PM   #17
GRD Tuning
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Default

Pauli, yes a stock 05 sti will make around 240whp on our dyno. I'm glad you like your tune. Let me know if you want to do a summer gas or race gas tune this coming season, and i can work something out for you

Quote:
Originally Posted by pauli18c View Post
just curious, what do 05 Sti baseline at? 240, if i read that right?

got my car tuned by you guys last january and put down about 360whp and you said you could get about another 20 out of it with summer gas, but couldnt justify bringing it back and paying for another tune.
been running great, and no complaints
Thanks, APS has been in the process of re-designing their headers. We will post up numbers after we get a chance to do some testing, etc.

Quote:
Originally Posted by slovak View Post
looks healthy and is making really good HP. So when are you going to add the APS equal length header???
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Old 01-23-2009, 08:49 PM   #18
axs_sense
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nice power, I'm in the process of picking up an 08 Sti myself
Too bad for the hks exhaust, you guys should go APS exhaust and re-tune it.
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Old 01-28-2009, 09:40 PM   #19
Pearl_White_Sti
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car drives great and is really quick.
I miss the low-end torque in my car
Cant wait to see a race gas tune and some track times soon
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Old 01-29-2009, 06:43 PM   #20
GRD Tuning
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Drag STi, 996 911TT
built TT, Built s15+more

Default

APS has not yet released parts for the 08 sti yet. We've got another 3" coming in within the next couple of weeks and will get some updated numbers at that point.

Let me know when you pick up your 08... we will definately take care of you

I've been driving this car quite a bit the last few days and I've got to say that it is a really fun daily driver setup.

-irfan

Quote:
Originally Posted by axs_sense View Post
nice power, I'm in the process of picking up an 08 Sti myself
Too bad for the hks exhaust, you guys should go APS exhaust and re-tune it.
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Old 04-11-2009, 09:12 AM   #21
tyce
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Any updates on this? Have you gone to the 3" exhaust yet?
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Old 04-11-2009, 01:40 PM   #22
GRD Tuning
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We do have the 3" exhaust on there but haven't had time to put it back on the dyno. I will post up as soon as we do.

On a side note, we had the car on a road course (autobahn country club) last week and this setup was quite responsive and fun.

-irf

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Any updates on this? Have you gone to the 3" exhaust yet?
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Old 04-13-2009, 08:26 PM   #23
ACLerok
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thank you for all the graphs!!
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