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Old 10-31-2012, 12:50 AM   #1
Scooby Specialist
Member#: 224615
Join Date: Sep 2009
Chapter/Region: MWSOC
Location: La Crosse, WI
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
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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