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Old 10-15-2004, 11:26 AM   #18
Scooby Specialist
Member#: 56414
Join Date: Mar 2004
Chapter/Region: MWSOC
Location: Olathe, KS
2018 FXT-T


Originally Posted by VR62STI
My 2004 STI on a Mustang dyno at Gruppe-S did:

275 hp and 311 ft-lbs on 91 octane!

Mods are:

Accessport stage 2 91 octane
Gruppe-S header, jet hot
Helix catted DP
Forge exhaust
Perrin pulley
GPmoto short ram

I am extremely happy with the numbers, especially considering I still have a cat and no stink, and am on California cheapy 91. Unfortunately my air-fuel ratio was at 11.8:1; I called Cobb and they suggested using the latest Stage 2 base maps, and ditching the short ram. Now I'm going to have to dyno this thing on 93 - because 2 points maked a huge difference in butt-power.

Wait so the Accessport will work with headers eh? Nice, I may go with AP after all. 11.8 to 1 isn't that bad is it? I thought it wasn't really dangerous until you get to around 13 to 1 and higher?
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