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Old 10-30-2012, 11:50 PM   #1
BoboTheMonkey
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Member#: 224615
Join Date: Sep 2009
Chapter/Region: MWSOC
Location: La Crosse, WI
Vehicle:
2004 WRX
San Remo Red

Default Cobb stage 2 to VF34 Protuned by RS Motors

Facility: RS Motors Burnsville, MN
Type of Dyno: Mustang
Baseline # for a stocker at the dyno: Unknown
Boost: 18.5
Fuel: 91 Octane
Target AFR: Unknown
SAE Corrections: None
Peak HP at RPM: 241 HP
Peak Torque at RPM: 235 Ft/Lbs
Mods: Mods list
HKS Hi-power catback
Perrin Catted DP
STI intercooler and Perrin hoses
DW 255lph fuel pump
Cobb SF intake

Added items from stage 2 to VF34
cobb spec 565cc injectors
VF34
Grimmspeed EBCS

Figured I would post these up for anyone thinking of going from stage 2 to a VF34. The results weren't the best due to the 91 octane recreational Ie non ethanol fuel that is available in my area, but I figure this can give a little bit of an idea as to the gains.

241WHP and 235Ft/lbs of torque VF34 Protune
217WHP and 192Ft/lbs of torque TD04 Cobb stage 2



Both were on Mustang Dynos which read very low to begin with and the one at RS I have been told reads very low. In any case I added 24whp and 42ft/lbs. As the torque curve goes, it remained almost the same up until 3400rpm where the VF34 pushes up to 235ft lbs and 18.5lbs of boost tapering to 16 compared to cobb stage 2s 15.5lbs I was hitting. Pulls very smoothly now and holds boost amazingly well. Also, boost response is almost instant with the EBCS now.

As the tune goes, we ran into pretty significant knock and the car pulling timing very heavily every time we pushed it hard. We also had a very stiff wastegate that was causing boost to oscillate pretty badly at first. Ron recommended if I could get any other fuel I would have made a lot more power. Very impressed with Ron's abilities and he did what he could for the bad gas he was given. Tune is pretty conservative because of this as well. Overall, not that impressed with the numbers, but they are just that, numbers. Car feels great and pulls smoothly, where is was very spiky with the Cobb vf34 tune. Thanks Ron for the great tune! E85 in the future for sure.




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Last edited by BoboTheMonkey; 11-04-2012 at 01:59 AM.
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Old 10-31-2012, 12:00 AM   #2
dumpstercrusher
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Member#: 134940
Join Date: Dec 2006
Chapter/Region: MAIC
Location: Glen Burnie, MD
Vehicle:
2006 Impreza WRX TR
vf39 ewg tuned ppg gears

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im guessing this is either an 06 or 07 because u were runin the tdo4
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Old 10-31-2012, 12:03 AM   #3
BoboTheMonkey
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Join Date: Sep 2009
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Location: La Crosse, WI
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2004 WRX
San Remo Red

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Nope, 2004 WRX.
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Old 10-31-2012, 09:27 AM   #4
WMCCook29
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Join Date: Jun 2007
Chapter/Region: NESIC
Location: Boston
Vehicle:
2005 VF34 WRX Wagon
WRB

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Quote:
Originally Posted by dumpstercrusher View Post
im guessing this is either an 06 or 07 because u were runin the tdo4
The TD04 is stock for 02-07 WRXs.
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Old 10-31-2012, 09:32 AM   #5
Nuke209
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Location: Minnesota
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NF Performance

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Quote:
Originally Posted by WMCCook29

The TD04 is stock for 02-07 WRXs.
Also 2008 wrx
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Old 10-31-2012, 09:53 AM   #6
WMCCook29
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WRB

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Quote:
Originally Posted by Nuke209 View Post
Also 2008 wrx
That's right, thanks.
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Old 10-31-2012, 12:56 PM   #7
dumpstercrusher
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Vehicle:
2006 Impreza WRX TR
vf39 ewg tuned ppg gears

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Quote:
Originally Posted by WMCCook29

The TD04 is stock for 02-07 WRXs.
my mistake. i forgot the other years lol
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Old 11-01-2012, 12:12 PM   #8
skatinboarding
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With only 91 octane on a mustang, it seems to be reasonable. Good decision to keep it conservative on 91.
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Old 11-04-2012, 01:06 AM   #9
BoboTheMonkey
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Join Date: Sep 2009
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Location: La Crosse, WI
Vehicle:
2004 WRX
San Remo Red

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Yea, we had to keep it pretty conservative because knock was a big issue. I think colder plugs may have helped a bit, but overall higher octane would have been better. He was a little surprised at how quickly it was pulling timing since in MN, basically all fuel has ethanol. Sadly, this is whats available here, so I wanted it tuned for it. The tune feels awesome! It is far better than the Cobb OTS VF34 tune, which honestly made me want to go back to the TD04. Now it pulls like the TD04 did, but pulls basically all the way to redline.
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Old 11-05-2012, 05:36 PM   #10
blk05wrx
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Location: Arlington Heights, IL
Vehicle:
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Black

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Good info. Thanks for posting. I've been toying with trying the same thing, but I'm just not sure it's worth the $1500 or so I would need in parts, and that's even figuring a used turbo and doing the installs myself. I would still need a fuel pump ($100), EBC ($100), Injectors ($400), Turbo ($400) and Tune ($450).

Maybe I just use that as a down payment on a 2011.
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Old 11-05-2012, 11:29 PM   #11
BoboTheMonkey
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Member#: 224615
Join Date: Sep 2009
Chapter/Region: MWSOC
Location: La Crosse, WI
Vehicle:
2004 WRX
San Remo Red

Default

Yea, I think there would have been another 15 or so hp on the table with better fuel, but all said and done its probably closer to 2k. Add in STI intercooler and hoses if you don't have them. My tune was $300. I mean it is probably good for about another 50whp over stage 2 with a wider powerband. I guess I just haven't seen too many back to back comparisons done between these two TD04 Vs VF34. I think its a good budget upgrade for the 2.0. Very fun to drive and a nice DD.
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Old 11-12-2012, 01:16 AM   #12
LAPTOPER
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Nice!
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Old 11-13-2012, 04:56 PM   #13
shadowmd
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2.5 hybrid 367whp/363wtq

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Not bad! I just took off my vf34 last night for a dom1.5xtr. I was running 565cc injectors and was able to run a 12.4 @111.50 in 100degree weather. So you def have a nice, fun setup going here!
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