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11-07-2005, 11:39 AM | #1 |
Scooby Specialist
Member#: 96164
Join Date: Sep 2005
Chapter/Region:
Tri-State
Location: NY
Vehicle:2005 STi - SOLD :( '00 Impreza 2.5rs |
Race gas info? (or higher octane)
I currently have a Protune map for 93 octane pump gas and I'm wondering if I'll see an increase in power if I run a higher octane gas?
I've heard the STi's ECU will only adjust itself up to 95 octane, any truth to this? What would my best bet be if I wanted to give this a try? I don't have any cats, so I don't know if I'd be better off using a leaded additive or if I should just keep it unleaded I honestly don't have any real experience with trying to up the octane of my gas on this car. Thanks for any help. PS: I don't have a map made for race gas, I'll be using the Protune 93 octane map.
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11-07-2005, 01:53 PM | #2 |
Scooby Specialist
Member#: 56468
Join Date: Mar 2004
Chapter/Region:
NWIC
Location: Seattle, WA
Vehicle:04 Improved STI Dirty White |
You can likely increase power with octane, but you will have to alter the tuning to do so. The ECU will adjust "closed loop" fueling (it's a loop of optimization) but not "open loop". You are talking about power during WOT, and that is "open loop" fueling. There is some adjustment made by the ECU even during open loop, but that is usually in response to detonation (which hopefully you don't have going on right now).
If you are running the stock turbo and injectors, don't bother with race gas. |
11-07-2005, 06:56 PM | #3 | |
Scooby Specialist
Member#: 60142
Join Date: Apr 2004
Location: Bend, OR
Vehicle:2011 WRX Grey |
Quote:
OTOH, if you're only talking about daily driving, I agree with bboy - you're simply wasting money. |
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11-07-2005, 07:11 PM | #4 |
Scooby Specialist
Member#: 28650
Join Date: Nov 2002
Chapter/Region:
TXIC
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if you have a datalogger you can watch what the car is doing. There's a free datalogger out there that seems to work well. I'm using streettuner. My protuned map is a little on the aggressive side and so the car pulls some timing on pump gas. In my case I do see a benefit from race gas, but it takes about 8 long pulls for the ECU to learn it's safe to start ramping timing back up. Once it gets to the advance set in my maps, it stops advancing timing. Fueling seems to be unchanged.
Long story short, if your map is tuned to the ragged edge, you might see a benefit from higher octane gas. If not, it's of no benefit. If you want to know for sure, run some logs and look at the total advance or dynamic advance values. |
11-07-2005, 08:47 PM | #5 | |
*** Banned ***
Member#: 2992
Join Date: Nov 2000
Chapter/Region:
NESIC
Location: Connecticut, USA
Vehicle:02 WRX Sedan Silver |
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11-08-2005, 05:21 PM | #6 |
Scooby Specialist
Member#: 89995
Join Date: Jun 2005
Chapter/Region:
MAIC
Location: Ellicott City
Vehicle:05 Broke STI |
Well ive run race gas on my TurboXS dynomap that was tuned on 93 and i swear your car just feels smoother (prob in my head) Plus race gas smells good
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11-08-2005, 05:59 PM | #7 | |
Scooby Specialist
Member#: 56468
Join Date: Mar 2004
Chapter/Region:
NWIC
Location: Seattle, WA
Vehicle:04 Improved STI Dirty White |
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11-09-2005, 11:27 AM | #8 |
Scooby Specialist
Member#: 67518
Join Date: Aug 2004
Chapter/Region:
NESIC
Location: Bean town
Vehicle:2013 Focus ST TB |
I use Sunoco 94 with 93 oct map.
I noticed a difference when I started using the 94 vs 93 The power delivery feels a lot smoother with it |
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