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Old 02-09-2016, 05:38 PM   #1
BrenTuning
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Default BrenTuning | 2008 STi - Blouch 1.5XT-R - KillerB Header - Built and tuned in house

Car: 2008 STi
Tuner: BrenTuning
Dyno Info: Mustang MD150
Transmission: 6-Speed
Gear: 4th
Peak HP at RPM: 450WHP @ 6100RPM
Peak Torque at RPM: 436WTQ @ ~5000RPM
Baseline HP/TQ for stock on same dyno: 2008 STi - 230WHP/230WTQ
Target Boost: 24PSI
Target AFR: ~11.7
Fuel: 93/MS109

Wilson brought us his 2008 STi a few years ago for a stage 1 dyno tune. The car made good power and lasted a couple years. This past summer he came to us with a cyl 4 misfire and stated he just paid a shop to do plugs all around. We immediately knew that it was a ringland issue as cyl 4 misfire was back again. We broke the news to him that the car would require a shortblock. Wilson mulled over what to do for a few months and around the first of the year contacted us to get the ball rolling on his build. We have been doing about 1 build / month for the past year after finding so many issues with other shops builds and have had great success with most of our customers looking for ~400WHP daily driven cars.

After some back and forth, we decided to do go with the modification list below which is one of our tried and true recipes. Remember, this car came in completely stock as far as hard parts go so there was a lot of work to accomplish.

This car is an absolute animal on the street. Cold temps with all seasons netted no traction through third gear. The car spools the same as it did with just a stage 1 map which is crazy since it makes another 130WTQ and 175WHP. Perfect drivability, smooth clutch engagement and a useful powerband make this car a pleasure to drive.

- Rallispec street short block
- Blouch 1.5XT-R 10CM/3"
- KillerB Holy Header
- ID1000 / DW65C / Cobb Stumble Kit
- Invida Catless DP
- Invidia Single Tip catback
- Grimmspeed TMIC
- Secondary Air block off
- Refreshed heads (stock)
- Southbend Stage 2 Daily
- ARP Studs
- Perrin 3" inlet
- KillerB oil pickup
- Cobb SF W/ box
- Cobb heatshield
- Grimmspeed crank pulley
- Misc gaskets/oil pump/oil pan/etc not mentioned





Dyno video:

https://www.youtube.com/watch?v=ZmY5...ature=youtu.be
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Old 02-09-2016, 05:44 PM   #2
Waddlz
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Location: Brighton, CO
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2012 STi
SWP

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wow. Thats some solid power out of a Dom 1.5xtr.

I was undecided between the 1.5xtr or 2.5xtr.
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Old 02-09-2016, 06:01 PM   #3
LittleBlueGT
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2013 STI GR
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Quote:
Originally Posted by BrenTuning View Post
The car spools the same as it did with just a stage 1 map which is crazy since it makes another 130WTQ and 175WHP.


I find your statement misleading; "spools same as stock".

Sure if you start the run at 2700-2800 rpms maybe, but most GR stage tunes I have done easily hit 250-300wtq (on a lower reading dyno too) well before 3000 rpm. That 1.5 XTR won't do that.


Other then that, thanks for the info, nice build!
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Old 02-09-2016, 06:08 PM   #4
02nismokiller
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What are the IDC at? Real solid numbers!!!!
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Old 02-10-2016, 11:19 AM   #5
BrenTuning
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Quote:
Originally Posted by 02nismokiller View Post
What are the IDC at? Real solid numbers!!!!
Pump gas plenty of head room.
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Old 02-10-2016, 01:12 PM   #6
Voodoo Rufus
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How much boost can the 1.5 handle before it turns into a flame thrower?
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Old 02-11-2016, 11:00 AM   #7
BrenTuning
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Quote:
Originally Posted by LittleBlueGT View Post
I find your statement misleading; "spools same as stock".

Sure if you start the run at 2700-2800 rpms maybe, but most GR stage tunes I have done easily hit 250-300wtq (on a lower reading dyno too) well before 3000 rpm. That 1.5 XTR won't do that.


Other then that, thanks for the info, nice build!
It makes the same torque or more EVERYWHERE over the curve. Of course the peak is later, but there isn't a single time that the car makes less power over the curve. There is an additional 100WTQ at 4000RPM over the same car stage 1.



Chris
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Old 02-11-2016, 11:19 AM   #8
BrenTuning
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Quote:
Originally Posted by Voodoo Rufus View Post
How much boost can the 1.5 handle before it turns into a flame thrower?
I'd assume 26-27PSI would be about it. No reason to push a small turbo to it's breaking point, just go up a size or two.

Chris
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Old 02-11-2016, 11:47 AM   #9
LittleBlueGT
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Quote:
Originally Posted by BrenTuning View Post
It makes the same torque or more EVERYWHERE over the curve. Of course the peak is later, but there isn't a single time that the car makes less power over the curve. There is an additional 100WTQ at 4000RPM over the same car stage 1.



Chris

I can see that from THAT plot.

And I am saying that THAT plot show a VERY VERY POOR Spooling stage 1.

Common, peak WTQ on stage1 with Dual AVCS at over 3500rpm.


Compare both starting at 2000 rpm and the story would be different in the spool-up region. HANDS DOWN GAURANTEED!!!

Trust me, I would love to see something make that kind of power and spool better then the stock turbo, but it really doesn't happen. (best I have evern seen is an EFR 6258, not the 6758, and that one was 200 rpm better then stage2, and 50 or so whp more)
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Old 02-11-2016, 12:08 PM   #10
Dave D.
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06 Red Ltd.Wagon
20g-xtr 427/427 JJtuned

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My 20g-xtr build is virtually identical with the exception of exhaust cams. I also run Lucas octane booster which gives an octane of 95. My tuner found that on the dyno, 22psi was the best compromise between boost and timing with the TMIC. On the street it will boost up to 24, but there's a difference in heat soak between multiple dyno pulls and one street pull.

Those look like excellent and expected numbers, and I'm sure, like my car, you are hitting peak torque sooner on the street.
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