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Old 01-13-2013, 02:04 PM   #1
user1029
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Member#: 57064
Join Date: Mar 2004
Vehicle:
2008 STi IAG built
HTA86, Meth, 272s, Cos IM

Default IAG built 2008 STi, 35R, Built Motor, 93 oct, 50/50 meth: 502whp DD

journal: http://www.iwsti.com/forums/gr-membe...seracecar.html

300wtq at 3.6 rpms with all this headwork
The midrange and vast area underneath the curve makes daily driving ridiculously exhilarating The stock intake manifold and street friendly 272s were left on for that purpose instead of going with Cosworth IM and 280s. The 50/50 meth is mainly for detonation suppression by equalizing the variances in quality of 93 octane we get around here. Meth was also used to accentuate the spool and midrange gains which is where I'm at most of the time. Conversely, I didn't want to go all out with meth at the top rpm ranges for safety which is why boost was tapered and I shift at 7k anyways. Furthermore, less emphasis was placed on the rpm band >7000 rpms (not a quarter mile drag car) because there are no permissible roads to do 140mph pulls on my daily commute lol


Dyno graph comparison (stock heads vs. IAG built heads, 272s) to illustrate how much IAG Stage V heads flow; no confounding variables because boost was kept the same as well as the turbo and all other parts of my setup.


IAG V-band rotated turbo kit
- GT35R 0.82 Tial V-band housing
- IAG FMIC kit with Spearco core
- IAG 4" Intake
- IAG V-band Uppipe
- IAG V-band Catless Downpipe
- Tial 44mm External Wastegate with open dump
- GT Spec Equal Length Headers V-band with Uppipe
- Harman Motive Catback Exhaust
- Aquamist HFS-6 running Boost Juice (50% methanol/50% water; tincture of meth to suppress detonation and get some chunky midrange)
- Injector Dynamics 2000cc injectors
- Aeromotive 340lph Fuel Pump
- Aeromotive Fuel Pressure Regulator
- IAG Fuel Rails
- IAG TGV Deletes
- Flipped stock Intake Manifold with retained Air Conditioning
- Cosworth Phenolic Spacers
- Grimmspeed Electronic Boost Control Solenoid
- Grimmspeed Thermostat
- Mishimoto Radiator
- Tial Q BOV
- LFR7AIX Spark Plugs
- IAG Catchcan
- Stock Air Pump deleted
- IAT sensor and 4 Bar MAP sensor
- Cobb Accessport Speed Density protuned by Jorge

IAG Stage 2 Bottom End
- Manley Platinum Series 99.5mm Piston Set
- Manley H-Beam Rods
- ACL Main and Rod Bearings
- OEM Nitrided Crank, OEM headgasket
- Killer B Oil Pickup with Baffle
- Gates Racing Timing Belt Kit
- 12,000mile/1year warranty

IAG Stage V Heads
- ARP Head Studs
- Manley Extreme Duty 33mm Exhaust Valve Set
- Manley Race Flow 37mm Intake Valve Set
- Manley Valve Spring and Retainer Kit
- IAG Stage V headwork with Multi Angle Valve Job/Port&Polish
- Kelford Dual AVCS 272/268 11.30/10.50mm Lift Street Cams


with gas mileage better than a Prius
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Last edited by user1029; 01-18-2013 at 07:53 PM.
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Old 01-13-2013, 02:15 PM   #2
az_sti_04
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gas mileage better than a prius lol whoa re you trying to fool. We all know that picture was taken coasting down a hill... car looks sick none the less.
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Old 01-13-2013, 02:59 PM   #3
bluemax189
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sick!!!! IAG continues to impress me with every car they build. some amazing stuff coming from there
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Old 01-13-2013, 03:51 PM   #4
freddy121389
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Quote:
Originally Posted by az_sti_04 View Post
gas mileage better than a prius lol whoa re you trying to fool. We all know that picture was taken coasting down a hill... car looks sick none the less.
its cuz he has bigger injectors. My buddy has 1000cc in his and uses E85 and supposedly gets 35mpg lol
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Old 01-13-2013, 04:19 PM   #5
Layvon
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Lookin good. I wish I could have gotten mine to work with the AC. I just gave up and deleted it. If it gets too warm for riding with windows down I'll take the truck.
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Old 01-13-2013, 11:18 PM   #6
Junior2JZ
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The ecu uses the OEM injector size in its calculation to determine MPG.

Cant change the size the ECU uses on the MPG Display with the current ecu mapping. Wish you could like on the GTR software
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Old 01-14-2013, 07:33 AM   #7
thisisntjared
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Ooo i would love to see the dyno for this...
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Old 01-14-2013, 08:17 PM   #8
user1029
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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bump with dyno sheet
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Old 01-14-2013, 09:17 PM   #9
KurtP
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nice. is it a gt or a gtx35r. how much boost?

Last edited by KurtP; 01-14-2013 at 09:23 PM.
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Old 01-14-2013, 09:38 PM   #10
user1029
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HTA86, Meth, 272s, Cos IM

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Quote:
Originally Posted by KurtP View Post
nice. is it a gt or a gtx35r. how much boost?
Thanks
regular old GT, 23psi on 93
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Old 01-15-2013, 06:20 PM   #11
user1029
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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both graphs up
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Old 01-15-2013, 10:12 PM   #12
user1029
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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Past dyno graphs added to compare
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Old 01-15-2013, 10:17 PM   #13
Slimsti
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Man I never thought I'd want headwork or cams cause the cost never seemed worth the gains. Ur thread has changed my mind. Looks sick man.
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Old 01-15-2013, 10:26 PM   #14
user1029
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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Quote:
Originally Posted by Slimsti View Post
Man I never thought I'd want headwork or cams cause the cost never seemed worth the gains. Ur thread has changed my mind. Looks sick man.
thanks man the gains would be amplified even more over if you went with 280 cams, Cosworth IM, 8k rev limit, and C16 fuel
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Old 01-16-2013, 03:39 PM   #15
CTSparky
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Congrats User.. Way to go.....
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Old 01-16-2013, 07:47 PM   #16
KurtP
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gained 80whp with zero loss in spool up.
another quality job by IAG
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Old 01-16-2013, 08:13 PM   #17
user1029
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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Quote:
Originally Posted by KurtP View Post
gained 80whp with zero loss in spool up.
another quality job by IAG
Dat meth
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Old 01-16-2013, 08:23 PM   #18
Slimsti
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415/405 Precision Tuning

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Meth is a wonderful thing. Some people seem to be afraid of it or feel its unsafe. I feel if u take care of it just like the rest of the car it'll be fine. I've had mine for 40k and zero issues.

Last edited by Slimsti; 01-16-2013 at 08:29 PM.
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Old 01-16-2013, 08:49 PM   #19
kakarot09
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Wrbm

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You have awesome results but its surprising to see how much the power falls up top. from 6000-7500 it falls 100whp. Even from 6-7k it has fallen 50whp.
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Old 01-16-2013, 10:20 PM   #20
user1029
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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Quote:
Originally Posted by kakarot09 View Post
You have awesome results but its surprising to see how much the power falls up top. from 6000-7500 it falls 100whp. Even from 6-7k it has fallen 50whp.
Blame it on the 272s, the stock IM, and the fact that this car is 98% daily driver so in effort to preserve the longevity of the motor and get chunky midrange, Jorge didn't want to go too crazy on the top end. The huge drop from on meth after 7k rpms was due to the meth flow from being too high and actually suppressing the spark; it is tricky running 2000cc injector duty cycles and correlating that with the Aquamist progressive flow at that rpm range. This is why the drop off in power was a lot more on meth than straight 93. As far as driving it, I still shift at 7k and fall right back into the powerband and I don't foresee at time I will be at the higher rpm ranges for prolonged periods like in 4th or 5th gear - 120mph on public roads = no license
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Old 01-16-2013, 10:26 PM   #21
user1029
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Join Date: Mar 2004
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

Default

Quote:
Originally Posted by Slimsti View Post
Meth is a wonderful thing. Some people seem to be afraid of it or feel its unsafe. I feel if u take care of it just like the rest of the car it'll be fine. I've had mine for 40k and zero issues.
Yup I'm running 50/50 meth for mainly detonation suppression by equalizing the variances in quality of 93 octane we get around here. Meth was also used to accentuate the spool and midrange gains which is where I'm at most of the time. Conversely, I didn't want to go all out with meth at the top rpm ranges for safety which is why boost was tapered.
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Old 01-16-2013, 11:00 PM   #22
kakarot09
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So is your meth based on idc instead of boost then? I think this is the reason most people try to use the boost reference instead right? I don't know that much about the meth systems to be honest. I've seen so many issues that I decided I won't ever run it.
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Old 01-16-2013, 11:15 PM   #23
9vapors
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Nice, I have similar heads going on mine. Seems like it would be a lot of fun to drive!
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Old 01-17-2013, 08:34 AM   #24
KurtP
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I bet some of the fall off is in the tune too. Jorge is notoriously conservative in his tuning...the fact the OP went something like 50k miles on a stock block 08 with a 35r is a testimony to that.....
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Old 01-17-2013, 06:35 PM   #25
user1029
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Join Date: Mar 2004
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2008 STi IAG built
HTA86, Meth, 272s, Cos IM

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Yeah in both instances he knew it was a daily driver so longevity and accounting for differing qualities of 93 was prioritized over power.
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