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BRZ First-Gen (2012+) -- General Topics All discussions about the first-gen Subaru BRZ coupe


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Old 11-03-2020, 11:06 AM   #15
RToyo86
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Originally Posted by DarkPira7e View Post
I have a friend with a 2017 series.yellow.
I installed catted UEL headers and flashed the openflash tablet stage 1 map onto his car. The overall "GAINZ" may not be significant, but it definitely improved the area under the curve. I 100% advocate for the openflash tablet if you want to turn the car into something that seems willing without getting into expensive territory.
Don't Catted uel have a specific stage 2 tune and not the (2+)?
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Old 11-03-2020, 11:36 AM   #16
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Originally Posted by Windycitystig View Post
I plan to get an Ace EL header with over pipe, flex-fuel kit to take advantage of e85 when available, and tune (delicious tuning) after my powertrain warranty ends.

I have read that combo should get me at least 40 hp extra at the wheel, which is like 50 hp at the crank.

This combo is almost $4000. Please chime in if anyone has data to refute the above hp claims.
40 hp gain? Interesting thought exercise. Assuming E85 fuel is actually 85% ethanol, it will have a stoichiometric ratio of 9.7:1 under normal load and perhaps 7.5:1 under heavy load when you want a richer fuel mixture. In comparison, E10 fuel has a stoichiometric ratio of 14.1:1 under normal load and perhaps 12.5:1 under heavy load. All things equal, which I know it is not, this means the E85 engine can burn between 50% and 70% more ethanol than an E10 engine burns gasoline. More fuel means more power.

However, internal combustion engines are heat transfer engines. If we forget about winter and summer blends of gasoline, E85 ethanol contains 81,900 BTU/gallon and E10 gasoline contains 111,800 BTU/gallon. If an E85 engine burns 70% more fuel than a gasoline engine (assuming the injectors and fuel pump can handle that increased volume), the E85 engine will burn 1.7 gallons of E85 fuel versus 1.0 gallon of E10 fuel.

• 1.7 gallons (E85) times 81,900 BTU/gallon = 139,230 BTUs.
• 1.0 gallons (E10) times 111,800 BTU/gallon = 111,800 BTUs.

I know this is an extremely crude method to estimate power potential, but if this relationship holds true, the E85 engine has the potential to “release” about 25% more energy than the E10 engine. Based on a 200 hp engine that equates to an additional 50hp. Again, I acknowledge this down and dirty estimate may be fraught with error, but this seems to support your estimate of a 40 whp gain.
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Old 11-03-2020, 11:44 AM   #17
DarkPira7e
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Don't Catted uel have a specific stage 2 tune and not the (2+)?
Can't recall honestly! Whatever had been recommended by their website is what I flashed to his car.
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Old 11-03-2020, 11:45 AM   #18
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Originally Posted by DarkPira7e View Post
I have a friend with a 2017 series.yellow.
I installed catted UEL headers and flashed the openflash tablet stage 1 map onto his car. The overall "GAINZ" may not be significant, but it definitely improved the area under the curve. I 100% advocate for the openflash tablet if you want to turn the car into something that seems willing without getting into expensive territory.

Why not load the stage 2 tune? If is tailored specifically for such header. Could've seen more actual gains vs the stage 1.
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Old 11-03-2020, 11:57 AM   #19
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Why not load the stage 2 tune? If is tailored specifically for such header. Could've seen more actual gains vs the stage 1.
See my reply above- it probably was stage 2 if that's what was recommended by OpenFlash. I can't recall 2 years ago accurately
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Old 11-03-2020, 11:59 AM   #20
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See my reply above- it probably was stage 2 if that's what was recommended by OpenFlash. I can't recall 2 years ago accurately

My bad, seems reasonable.
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Old 11-04-2020, 04:36 PM   #21
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What headers do you run? also catted or uncatted?
Me? I got Pro Speed Racing one's. The exhaust guy that fitted them nearly wept at the beauty of the collector. $750.

The main gain is in removing the restriction of the cats in the headers.

Where in Aus are you?

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