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Old 02-10-2014, 09:41 PM   #1
chris keefe
Scooby Specialist
 
Member#: 270312
Join Date: Jan 2011
Chapter/Region: NESIC
Location: NEW BEDFORD MA
Vehicle:
2005 wrx sti
CGM/ PEARL WHITE

Default 05 STI VF39 303whp/ 352wtq, 93 Octane tune, header comparison

My first time posting in this section.. Alot of new Subaru owners really don't understand the benefits of going from unequal length headers to an equal length or even a 1.5 scroll header. Alot don't want to lose the Subaru rumble but want to make power. Below is a direct comparison of my 1.5 Scroll Stock location header and up-pipe I made for my tuner friend Tyler Wolf versus the quality Tomie UEQ headers.

Dynograph.. Numbers are on Mustang AWD-500, same boost, Tyler only adjusted fuel to put the tune back where it needed to be.. Magical numbers on our time crunch..

drum roll please...

303WHP & 352WTQ, gains of 21WHP and 31WTQ over the Tomie UEQ headers on 93 Octane!


image by chris keefe, on Flickr

and in case your interested.. the baseline Cobb Stage 2 tune the car came with, Tylers protune he did himself using Opensource with Tomei UEQ's then the same tune with the 1.5 scroll stock location headers.


image by chris keefe, on Flickr

follow the link to view the dyno video.. be warned.. its a honda RX7

http://www.flickr.com/photos/60819538@N05/12447240464/

Mods:
Stock vf39
Stock wastegate
Stock tgvs
Stock bov
Stock tmic
Grimspeed divorced downpipe
aluminum catback I made previously for the car
1.5 scroll stock location header and up-pipe I made
ID 850 side feed
Cobb intake
DW 300 fuel pump
Pro Tune by Tyler Wolf

Data logs also back up the HP and TQ gains with the significant findings in the increase of mass air flow. The results netted a peak gain of 5.6% increase in mass air flow and an average of 3% in the higher rpm range. What you are looking at is the actual logged MAF G/S between the two pulls and the percentage increase at rpm points in increments of 2500 to 7000 in 500 rpm increments. Needless to say these are substantial improvements for a bolt on needing a little more tuning to maximize the potential it has. More mass air flow at same boost, fuel, and timing = higher VE.


Chris vs Tomei MAF by chris keefe, on Flickr


Chris vs tomei Maf % gains by chris keefe, on Flickr

some final fitment photos..


image by chris keefe, on Flickr


image by chris keefe, on Flickr


image by chris keefe, on Flickr

For more pictures on the build, check out my fab thread..

http://forums.nasioc.com/forums/show....php?t=2593321


If you have Dyno graphs of comparisons between UEQ to EQ please post them here!
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Last edited by chris keefe; 02-12-2014 at 09:51 PM.
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Old 02-11-2014, 07:41 AM   #2
thisisntjared
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Member#: 177891
Join Date: Apr 2008
Chapter/Region: Tri-State
Location: south jersey
Vehicle:
06 wrx wagon
child seat/tow hitch cgm

Default

I am assuming a difference in the diameter in the primaries?
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Old 02-11-2014, 08:10 AM   #3
chris keefe
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Member#: 270312
Join Date: Jan 2011
Chapter/Region: NESIC
Location: NEW BEDFORD MA
Vehicle:
2005 wrx sti
CGM/ PEARL WHITE

Default

1.625" primaries
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Old 02-11-2014, 08:24 AM   #4
ride5000
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Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
Vehicle:
2003 GGA MBP
12.9 / 105+

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slowed the spool a bit but definitely more area under the curve.

are you planning on coating or wrapping them?

good work.
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Old 02-11-2014, 09:49 AM   #5
bjohnson_55
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Member#: 216580
Join Date: Jul 2009
Chapter/Region: MWSOC
Location: Indy- johnsontuning
Vehicle:
2004 STi-Sold
Java Black Pearl

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ID850 side feed?
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Old 02-11-2014, 02:19 PM   #6
chris keefe
Scooby Specialist
 
Member#: 270312
Join Date: Jan 2011
Chapter/Region: NESIC
Location: NEW BEDFORD MA
Vehicle:
2005 wrx sti
CGM/ PEARL WHITE

Default

Definitely going to ceramic coat them.. Car favors a rich spool so there is still more work to be done.. This was 2 pulls after swapping headers and adding fuel. Yes these are side feed 850s.. Injector Duty Cycle was right around 67%
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