Cobb Stage 2, 91 vs 93 octane
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Cobb Stage 2 91 vs 93 octane
Hey,
On Cobb's site, they say to get their 91 octane map if you have access to 92 octane gas. But if you have access to 94 octane, get the 93 octane map. I live in Florida, and have access to 93 year round. I'd hate to have a detonation issue with their 93 map when it's hot as ****here. Has anyone run their 93 map on 93 octane when it's hot and humid out? How does the car run? Have you felt that the 93 map was too aggressive for the heat? I know it's only five horsepower...
My mods so far: homeade CAI from fenderwell w/ stock airbox.
ground wire mod
synthetic 0w 40 mobil 1
gutted up pipe
next week: Bosal downpipe
Pony express MIL
On Cobb's site, they say to get their 91 octane map if you have access to 92 octane gas. But if you have access to 94 octane, get the 93 octane map. I live in Florida, and have access to 93 year round. I'd hate to have a detonation issue with their 93 map when it's hot as ****here. Has anyone run their 93 map on 93 octane when it's hot and humid out? How does the car run? Have you felt that the 93 map was too aggressive for the heat? I know it's only five horsepower...
My mods so far: homeade CAI from fenderwell w/ stock airbox.
ground wire mod
synthetic 0w 40 mobil 1
gutted up pipe
next week: Bosal downpipe
Pony express MIL
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Posts: 10,029
From: Sacramento CA
Car Info: 02 Impreza WRX sedan
Why not give Cobb Tuning a call? Most off-the-shelf maps are done conservatively to grant some leeway in preventing knock in temperature extremes.
If Cobb states that it's only a 5 hp gain over a 91 octane map, it's probably a more substantial torque gain in the mid-range. Shiv of Vishnu Performance also has maps for higher octane pump gas and says that the biggest gain is in the mid-range where he can add a few degrees of ignition advance for a big increase in torque. The lower octane fuel won't take the aggressive advance curve.
Don't overlook a wider torque curve. The WRX engine's small displacement and widely-spaced 5MT gearing mean that the wider torque curve will yield big gains in acceleration - more than a few hp increase would suggest.
--
0==WW==0
"…axles of evil…" - george w. bush
If Cobb states that it's only a 5 hp gain over a 91 octane map, it's probably a more substantial torque gain in the mid-range. Shiv of Vishnu Performance also has maps for higher octane pump gas and says that the biggest gain is in the mid-range where he can add a few degrees of ignition advance for a big increase in torque. The lower octane fuel won't take the aggressive advance curve.
Don't overlook a wider torque curve. The WRX engine's small displacement and widely-spaced 5MT gearing mean that the wider torque curve will yield big gains in acceleration - more than a few hp increase would suggest.
--
0==WW==0
"…axles of evil…" - george w. bush
Guest
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Thanks for your replies. I plan on installing my Bosal downpipe early next week. I guess what I am after with the reflash is consistent, reliable horsepower. I've read that even the Cobb stage 2 93 map is a tad conservative, so I shouldn't have any issues, even in the extreme heat and humidity. I realize that any well managed system will pull a small amount of timing to compensate for the hot weather. I just didn't want a reflash that worked well only when it was less than 50 degrees out. I will go with Cobb, I just wanted your input.
Woody!
Woody!
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