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Old 01-29-2010, 07:50 PM   #1
Cobb Tuning
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Default Dyno Tune: 2.5L, GT35R, E85-Tuned STI Makes 540whp!

COBB Tuning Surgeline: 2.5L w/GT35R on E85

Location: COBB Tuning Surgeline
Ambient Temp: 47 F Daily Average
Elevation: Approximately Sea Level
Weather: Indoor

2007 Subaru STi Limited
Tuner: Tim Bailey
Dyno Info: Mustang AWD-500
Peak HP at RPM: 547 WHP@7100RPM
Peak Torque at RPM: 471 WTQ@5040RPM
Baseline hp/tq for a stock on same dyno: 2010 STi: 239 WTQ, 228 WHP
Target Boost: 27 PSI
Target AFR: 8:1
Fuel: E85

Engine/Power Modifications:
  • COBB Tuning AccessPORT
  • Crawford GT35R Rotated Turbo Kit
  • Cosworth Intake Manifold
  • GrimmSpeed PnP Exhaust Manifold
  • Crawford Turboback Exhaust
  • Crawford FMIC
  • Injector Dynamic 2000cc Fuel Injectors
  • GSC Stage 2 Cams
  • Built Bottom End

Custom Cobb Tuning Surgeline Fuel System:
  • Custom Surge Tank
  • Dual Bosch 044 External Fuel Pumps
  • Walbro GSS342 In Tank Fuel Pumps
  • -8AN Feed, -6AN Return
  • Aeromotive Fuel Rails & FPR






Huge horsepower will never go out of style, but the tools, vehicles and fuels used to make that power will always change. Thanks to environmentally-conscious motorists looking for an alternative to petrolium-based fuels, E85, 85% corn-based ethanol and 15% gasoline blend, is becoming more common. In addition to being somewhat more environmentally friendly, E85 is also 105 octane which is great for making big power and lots of boost. The downside to E85 is that it is about 1/3 lighter than gasoline and requires more fuel to be injected into the combustion chamber than gasoline. That means upgrading your fuel system in a way not needed for gasoline applications. This car, a 2007 STI limited, was built for a <a href='http://www.cobbtuningsurgeline.com'>COBB Tuning Surgeline</a> customer who wanted to make as close to 600whp as he could, using E85 as his fuel of choice.



To provide the needed fuel to run a STI complete with a GT35R turbocharger and GSC Stage 2 cams, A single Walbro fuel pump feeds a COBB Tuning Surgeline custom-built surge tank. Feeding fuel to the engine is a pair of Bosch 044 inline fuel pumps that lead to a set of Injector Dynamics 2000cc injectors. While this may seem like a little overkill on the fuel system side of things, keep in mind that E85 dictates a very large volume of fuel to compensate for the large amounts of boost this car was setup to run. Peak power of 547whp was made at 27lbs of boost! On 92 octane pump fuel, power was limited to only 454hp, E85 allowed this engine to run 5psi more and an extra 100hp!



Vehicles tuned on E85 are quickly becoming more and more popular. Not for their supposed eco-friendly nature, but due to their ability to greatly increase horsepower while still being a relatively inexpensive fuel source compared to leaded, and even unleaded "race" fuels. For more information on how to setup your car for E85 power, contact COBB Tuning Surgeline today!



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Last edited by Cobb Tuning; 01-29-2010 at 08:26 PM.
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Old 01-29-2010, 07:52 PM   #2
IMPORTIMAGE
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WE MAKE'EM FASTER!
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looks real nice. keep up the good work!
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Old 01-29-2010, 07:58 PM   #3
juanmedina
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WRX VF39+E85 12.0, 121mph

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sick E85 FTW

I wonder what is the IDC? what is the AR?
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Old 01-29-2010, 08:05 PM   #4
Phatron
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one bosch wasnt enough? or was it even tried?

curious cause i have a bosch + the id2000's im gonna use with e85 for a PT67. Should i just get another pump now?

Is that a Y Connector connecting the 2 pumps? Doesnt that effectively eliminate one of the pumps? The volume of fuel is being restricted by the size of the stainless line after the Y isnt it?

Last edited by Phatron; 01-29-2010 at 08:25 PM.
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Old 01-29-2010, 08:06 PM   #5
STi Mikey
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This is just plain sick.


Can you guys do an aorboy pull. I bet its 590-610whp. This car is a damn BEAST!!
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Old 01-29-2010, 08:17 PM   #6
06-wrx-tr
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Did i miss something? Is this the stock motor??
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Old 01-29-2010, 08:21 PM   #7
Cobb Tuning
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Not a stock motor, GSC stage 2 cams with a built bottom end.

We did some testing with a single walbro on 1000cc injectors, but not on the 2000cc injectors. This customer wanted a solid build with plenty of headroom, which was achieved with the dual 044 setup. Having the second pump certainly builds some headroom into the system for running E85.

Last edited by Cobb Tuning; 01-29-2010 at 08:35 PM.
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Old 01-29-2010, 08:23 PM   #8
4ST-AIR
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Is it just me or does 454WHP on 92 oct ON A MUSTANG Dyno not jump out as extremely out there without any major engine or head work?????
Quote:
Originally Posted by Cobb Tuning View Post
Not a stock motor, GSC cams with a built bottom end.

We did some testing with a single walbro on 1000cc injectors, but not on the 2000cc injectors. This customer wanted a solid build with plenty of headroom, which was achieved with the dual 044 setup. Having the second pump certainly builds some headroom into the system for running E85.
Well Hell that's a different ballgame altogether you should really say that up front. Letting people assume brutal power was built like that on anyting other than a fully built bottom with heads ( **** yes to GSC cams!) is just adding to the bad rep.

I still think 454WHP on a Mustang Dyno on 92oct or on a ANY fully built motor is still out there and that has to be the CF # because that's like 522WHP on a DynoJet/Dynamics.

Do love that 92oct power though on the built bottom & heads. Stage 2 or 3 on the GSC cams?

Last edited by 4ST-AIR; 01-29-2010 at 08:35 PM. Reason: EDITED for the bull**** call
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Old 01-29-2010, 08:42 PM   #9
Phatron
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Quote:
Originally Posted by Cobb Tuning View Post
Not a stock motor, GSC cams with a built bottom end.

We did some testing with a single walbro on 1000cc injectors, but not on the 2000cc injectors. This customer wanted a solid build with plenty of headroom, which was achieved with the dual 044 setup. Having the second pump certainly builds some headroom into the system for running E85.
Curious how the second pump adds anymore flow?

If they connect at that Y to a single -8 Line.....its still being fed by 1 -8 Line at 70psi......

For the 2 pumps to actually add to the fuel volume to the injectors they would have to be run in parallel (separate lines) or by increasing to a -10 or -12 line after the Y. Right?
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Old 01-29-2010, 08:44 PM   #10
juanmedina
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WRX VF39+E85 12.0, 121mph

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Quote:
Originally Posted by 4ST-AIR View Post
Is it just me or does 454WHP on 92 oct ON A MUSTANG Dyno not jump out as extremely out there without any major engine or head work?????

Well Hell that's a different ballgame altogether you should really say that up front. Letting people assume brutal power was built like that on anyting other than a fully built bottom with heads ( **** yes to GSC cams!) is just adding to the bad rep.

I still think 454WHP on a Mustang Dyno on 92oct or on a ANY fully built motor is still out there and that has to be the CF # because that's like 522WHP on a DynoJet/Dynamics.

Do love that 92oct power though on the built bottom & heads. Stage 2 or 3 on the GSC cams?
The cobb mustang dyno is one of the highest reading mustang dynos per EVOM
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Old 01-29-2010, 09:28 PM   #11
jmullene
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If you don't mind answering this question Tim - what did you think of the Crawford kit?
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Old 01-29-2010, 09:38 PM   #12
PlanetGranite
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Quote:
Originally Posted by juanmedina View Post
The cobb mustang dyno is one of the highest reading mustang dynos per EVOM
Referring to the one at Cobb, or the one at Surgeline (where the car was tuned)?
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Old 01-29-2010, 09:52 PM   #13
juanmedina
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WRX VF39+E85 12.0, 121mph

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Quote:
Originally Posted by PlanetGranite View Post
Referring to the one at Cobb, or the one at Surgeline (where the car was tuned)?
Cobb...but who knows who they are really referring to

http://forums.evolutionm.net/evo-dyn...sec9-site.html

see post 26 for reference
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Old 01-29-2010, 10:21 PM   #14
crashtke
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Quote:
Originally Posted by juanmedina View Post
Cobb...but who knows who they are really referring to

http://forums.evolutionm.net/evo-dyn...sec9-site.html

see post 26 for reference
Per that post we are talking about a 4% difference....different dynos. Who cares?!?! That could be explained by different runs with different conditions.

Does it matter? Congrats on a fast car guys! I am sure it is still MUCH faster than it came to you! These results are not anywhere near out of the realm of normal for a 35R on E85.
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Old 01-29-2010, 10:38 PM   #15
juanmedina
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Quote:
Originally Posted by crashtke View Post
Per that post we are talking about a 4% difference....different dynos. Who cares?!?! That could be explained by different runs with different conditions.

Does it matter? Congrats on a fast car guys! I am sure it is still MUCH faster than it came to you! These results are not anywhere near out of the realm of normal for a 35R on E85.
I really don't care i was just answering that guy question..this car is making great power and is really nice built.

if u think making 30 whp less and still trap 7 mph higher than the other car is nothing u make baby jesus cry... and thats just one thread
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Old 01-29-2010, 10:46 PM   #16
crashtke
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Different cars, possibly different weights, different conditions....please dude, the exact SAME CAR can run different times on the same track on different days.
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Old 01-31-2010, 11:08 AM   #17
toyjunkie
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what a/r are you running on the turbine?
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Old 02-01-2010, 08:49 PM   #18
SubieFiesta
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and 2005 Subaru STi

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engine bay pics?
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Old 02-01-2010, 09:54 PM   #19
MSP608
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2.3L Evo

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Is that surge tank anodized?
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Old 02-01-2010, 10:19 PM   #20
Cobb Tuning
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Quote:
Originally Posted by Phatron View Post
Curious how the second pump adds anymore flow?

If they connect at that Y to a single -8 Line.....its still being fed by 1 -8 Line at 70psi......

For the 2 pumps to actually add to the fuel volume to the injectors they would have to be run in parallel (separate lines) or by increasing to a -10 or -12 line after the Y. Right?
Overall flow available from the pump is affected by the rail pressure demanded -- using multiple feed pumps ensures the required flow is met at the pressure demanded.

Quote:
Originally Posted by jmullene View Post
If you don't mind answering this question Tim - what did you think of the Crawford kit?
It functions much like any other rotated GT-series setup. Crawford kits are of very nice design and build quality. I would personally prefer to see larger boost tubes and a BOV provision, but the numbers speak for themselves.

Quote:
Originally Posted by juanmedina View Post
Cobb...but who knows who they are really referring to

http://forums.evolutionm.net/evo-dyn...sec9-site.html

see post 26 for reference
COBB Tuning owns three Mustang dynos, one at each facility -- headquarters, Surgeline and Plano. All read similarily but not identically; even essentially duplicate hardware adds up to a slightly different end results when it comes to chassis dynos. This car was tuned at Surgeline in Portland, OR.

Quote:
Originally Posted by toyjunkie View Post
what a/r are you running on the turbine?
Based on the spool I believe this is a .82; I would need to verify with the owner or the shop that performed the kit install.

Thanks everyone for the questions and interest!

Regards,
Lance
COBB Tuning Surgeline
(503) 670-9500
http://surgeline.cobbtuning.com
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Old 02-01-2010, 10:48 PM   #21
SubieFiesta
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Quote:
Originally Posted by SubieFiesta View Post
engine bay pics?

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Old 02-01-2010, 10:50 PM   #22
liljon350
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wow that car looks clean...wow
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Old 02-02-2010, 04:47 PM   #23
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Nice work, e85 FTW. The dyno doesn't seem to read too long seeing as a 2010 STI baselines at 228whp. Tim always does good things.
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Old 02-02-2010, 05:18 PM   #24
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Are you running a stock crank?
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Old 02-02-2010, 06:31 PM   #25
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Quote:
Originally Posted by MSP608 View Post
Is that surge tank anodized?
Yes? No?
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