Dyno'ed an FRS with 104 octane in the tank! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BerkTechnology · 10-18-2012, 08:47 PM

Was doing some testing a few weeks back on a Dynojet. Tank was damn near empty by the time we were all done so we dumped a gallon of Sunoco GT Plus into the tank (rated @ 104 octane RM2).

Guess how much power we made?

ZERO!!!

Maybe a tuner can chime in but it seems like this ECU uses a torque limiter and is locked down pretty good from the factory. Not easy to make power on this car without a reflash. Any truth to my suspicions?

PS - I'm in Cali and all we get is 91 oct (RM2).

CBR600RR · 10-18-2012, 08:58 PM

I would say: yes, that is true

MKIV · 10-18-2012, 08:59 PM

Octane don't make power. It makes the flash point higher. The only reason why you loose power with lower octane is that the ECU pulls timing due to knock. If you get no knock with a given fuel, increasing octane from there will not yield you more power.

xjohnx · 10-18-2012, 09:08 PM

Quote:

Originally Posted by BerkTechnology

Was doing some testing a few weeks back on a Dynojet. Tank was damn near empty by the time we were all done so we dumped a gallon of Sunoco GT Plus into the tank (rated @ 104 octane RM2).

Guess how much power we made?

ZERO!!!

Maybe a tuner can chime in but it seems like this ECU uses a torque limiter and is locked down pretty good from the factory. Not easy to make power on this car without a reflash. Any truth to my suspicions?

PS - I'm in Cali and all we get is 91 oct (RM2).

why does this surprise you??

dsmx17 · 10-18-2012, 09:25 PM

Quote:

Originally Posted by xjohnx

why does this surprise you??

If anything, i'd expect it to lose power without adding timing while running 104 octane.

post_break · 10-18-2012, 09:27 PM

I know with my mustang running 93 produces more horsepower thanks to CVVT. Dynos proved it. Too bad the 86 doesn't produce more power with a higher octane.

ABQautoxer · 10-18-2012, 09:36 PM

Did you, out of curiosity, pull the battery ground? Only asking because I did this on the dyno and made 11whp more though I was low on the pulls done before this.

brichard0625 · 10-18-2012, 09:56 PM

Quote:

Originally Posted by ABQautoxer

Did you, out of curiosity, pull the battery ground? Only asking because I did this on the dyno and made 11whp more though I was low on the pulls done before this.

Yea im starting to think our ecu's are very sensitive and whenever something is done to the car that effects timing, air fuel etc the ecu has to be reset...

einzlr · 10-18-2012, 10:20 PM

2forme · 10-18-2012, 10:26 PM

I've talked to John about this. He mentioned that race gas didn't do squat as well.

It's surprising given the gains on E85.

Buhryant · 10-18-2012, 10:31 PM

What the fuck. That is mind blowing

brichard0625 · 10-18-2012, 10:53 PM

Quote:

Originally Posted by 2forme

I've talked to John about this. He mentioned that race gas didn't do squat as well.

It's surprising given the gains on E85.

yea didnt do anything :/....maybe a 3hp-4hp gain..even if it made 11whp its about $50+ for 5 gallons e-85 is the best alternative right now i think.

TheRipler · 10-18-2012, 11:06 PM

Quote:

Originally Posted by 2forme

I've talked to John about this. He mentioned that race gas didn't do squat as well.

It's surprising given the gains on E85.

You won't make gains with E85 and no tune. Straight 104 is just too much of a jump. If there was enough timing advance available to run 104, there would be motors dropping left and right on pump gas.

You could mix that 1gal of 104 with 5-6gal of 91, and see a bump on the OEM tune. I've seen it on other Subarus, BMWs, Porches, etc running 93, so I'm sure it would help with California gas.

2forme · 10-18-2012, 11:08 PM

Quote:

Originally Posted by TheRipler

You won't make gains with E85 and no tune. Straight 104 is just too much of a jump. If there was enough timing advance available to run 104, there would be motors dropping left and right on pump gas.

You could mix that 1gal of 104 with 5-6gal of 91, and see a bump on the OEM tune. I've seen it on other Subarus, BMWs, Porches, etc running 93, so I'm sure it would help with California gas.

I understand this, but he was tuning 104....

10-18-2012, 08:47 PM	#1
BerkTechnology Member Join Date: Jun 2012 Drives: Scion FRS Location: Santa Ana Posts: 16 Thanks: 0 Thanked 42 Times in 8 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Dyno'ed an FRS with 104 octane in the tank! Was doing some testing a few weeks back on a Dynojet. Tank was damn near empty by the time we were all done so we dumped a gallon of Sunoco GT Plus into the tank (rated @ 104 octane RM2). Guess how much power we made? ZERO!!! Maybe a tuner can chime in but it seems like this ECU uses a torque limiter and is locked down pretty good from the factory. Not easy to make power on this car without a reflash. Any truth to my suspicions? PS - I'm in Cali and all we get is 91 oct (RM2).

10-18-2012, 09:36 PM	#7
ABQautoxer Senior Member Join Date: Jun 2012 Drives: 2021 Supra / 2022 Tundra Location: Albuquerque, NM Posts: 659 Thanks: 60 Thanked 197 Times in 141 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Did you, out of curiosity, pull the battery ground? Only asking because I did this on the dyno and made 11whp more though I was low on the pulls done before this. __________________ TomR

10-18-2012, 10:31 PM	#11
Buhryant Member Join Date: Sep 2012 Drives: Whiteout Scion FR-S Location: SoCAL Posts: 10 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	What the fuck. That is mind blowing __________________ peace ez breezy

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10-18-2012, 08:58 PM	#2
CBR600RR Senior Member Join Date: Jul 2012 Drives: Raven Black Location: Ottawa, Canada Posts: 1,343 Thanks: 451 Thanked 563 Times in 276 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	I would say: yes, that is true

10-18-2012, 08:59 PM	#3
MKIV Senior Member Join Date: Feb 2011 Drives: 4 tires mounted to 4 wheels Location: donw low Posts: 118 Thanks: 11 Thanked 58 Times in 26 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Octane don't make power. It makes the flash point higher. The only reason why you loose power with lower octane is that the ECU pulls timing due to knock. If you get no knock with a given fuel, increasing octane from there will not yield you more power.

10-18-2012, 10:20 PM	#9
einzlr Senior Member Join Date: Sep 2012 Drives: several Location: norcal Posts: 903 Thanks: 421 Thanked 286 Times in 223 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)

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