Octane Boosters
Newbie
Joined: Dec 2003
Posts: 39
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From: Malaysia
AeroTech Afterburn
There's this power booster that boost octane level as well. From a standard 97-octane fuel it did boost the rating up by about 1.6 bringing it to about 98.6-octane. It's called Afterburn by this company Aerotech. comes in two sizes the 250 ML and 500 ML. When tested on the Nissan Silvia S13 running on the SR20DET engine, it created a +9 hp hike on the dyno. Tried and tested on the WRX and the Integra DC2 both made an 8.4 hp increase as well. They are currently testing it out on the Evo 6 RS model.
www.SpeedXS.com - Center for Japanese Performance Cars
www.SpeedXS.com - Center for Japanese Performance Cars
Evolving Member
Joined: May 2003
Posts: 229
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From: The OC
xylene is the greatest octane booster ever. you can get it for about 5 bucks a gallon and its 117 octane. the only thing is that it is not made to be fuel and does not have the lubrication that fuel has so you have to add ether Marvels Mystery oil or ATF to it so that it does not corrode your gas tank lines and fittings.
Originally posted by evoaviator
i've been researching the "octane booster" too and toluene keeps coming up as the best bet. people say you can get it at the home depot for like $3/gallon. so, what do you guys think, a gallon of toluene per tank or is that too much? anybody heard from the rockert scientist yet? my problem here in southern ohio is that when buy 93 or 94 octane you usually aren't getting it. there is noticeable differences from fill up to fill up. any one else have this problem?
i've been researching the "octane booster" too and toluene keeps coming up as the best bet. people say you can get it at the home depot for like $3/gallon. so, what do you guys think, a gallon of toluene per tank or is that too much? anybody heard from the rockert scientist yet? my problem here in southern ohio is that when buy 93 or 94 octane you usually aren't getting it. there is noticeable differences from fill up to fill up. any one else have this problem?
Im with you on that, like penzoils around here suck compared to the 93 from BP or Citgo and it just so happens that my family uses Penzoil gas cards
Evolving Member
Joined: Sep 2003
Posts: 473
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From: LA, CA, USA
Originally posted by MyCre8n=Evlshn
I think the idea that higher octane gives you better power is BS. Unless you are tuning for the higher octane, or unless you were having knock sensor limiting prior to octane boost...the higher octane is just costing more. I used to think higher octane meant more explosive fuel. Then I did some reading and found out it is the opposite. Higher octane resists detonation and thus prevents knock at high pressures and temps. So if you are running higher boost, you need higher octane...or leaner, or hotter cylinder temps. Damn, I can't find my document that I downloaded about a year ago when I was trying to learn about all of this stuff. This is what I recall: There was no reason to buy higher octane fuel unless I was going to be pushing toward detonation. If the car is stock, it's tuned for 91 (?) octane and higher octane just spends more money on exactly the same amount of fuel. I have a degree in chemistry (bachelor's) so my reading wasn't totally ignorant...but I'm no hydrocarbon fuel expert and I only know what I know about tuning from reading the forums in here.
I think the idea that higher octane gives you better power is BS. Unless you are tuning for the higher octane, or unless you were having knock sensor limiting prior to octane boost...the higher octane is just costing more. I used to think higher octane meant more explosive fuel. Then I did some reading and found out it is the opposite. Higher octane resists detonation and thus prevents knock at high pressures and temps. So if you are running higher boost, you need higher octane...or leaner, or hotter cylinder temps. Damn, I can't find my document that I downloaded about a year ago when I was trying to learn about all of this stuff. This is what I recall: There was no reason to buy higher octane fuel unless I was going to be pushing toward detonation. If the car is stock, it's tuned for 91 (?) octane and higher octane just spends more money on exactly the same amount of fuel. I have a degree in chemistry (bachelor's) so my reading wasn't totally ignorant...but I'm no hydrocarbon fuel expert and I only know what I know about tuning from reading the forums in here.
It's even stated in the users manual
http://www.CarPhoto.net
I put 5 gallons of Mobil's 101 unleaded race gas in today with a little less then a 1/4 tank of 91. I will say that the car pulled so much cleaner to redline and didn't seem to struggle at all. I decided to turn up my boost from my normal setting of 19psi to 22.5psi and leaned out my top end with my AFC-2 some more. The power gain was definitely noticiable. My EGT on the top of third was only hitting 820 degrees Celcius, which means I could have leaned out my fuel curve even more and gotten even more power. The car definitely pulled really hard all the way to 7500 rpm's. Wish I could run straight 101 all the time, but at $3.99 a gallon that would get expensive. Also, I got it 180 miles away from where I live so I won't be able to enjoy it to much. Only have a 1/4 tank left. Sure doesn't last long when your having fun , lol. By the way, I was hitting 22-23psi in 5th at low rpm's and did hit fuel cut. As long as the rpm's were higher in a lower gear I didn't see fuel cut at all.
here are my 2 cents... I added 2 gallons of 110 octane to a bit less than a quarter tank. this was at the race track, it's a 1/8 track. I ran only .020 faster than last time without 110. It was also colder than the first time i took my car to the track. so i don't think higher octane makes much of a difference. I ran a 8.754 with out race gas and 8.732 with race gas. not much of a difference
Evolving Member
Joined: Sep 2003
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The entire point of race gas'es existence is too lean out the car and add more boost. if you don't tune for higher octane the gains will be minimal.
I am however surprised your gains were that small, what pump gas were you running, is your boost still dropping off to 15 psi like stock, and how did your MPH change?
I am however surprised your gains were that small, what pump gas were you running, is your boost still dropping off to 15 psi like stock, and how did your MPH change?
Evolved Member
iTrader: (20)
Joined: Mar 2003
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From: Danville/Blackhawk, California
FWIW, increasing octane in an EVO will help power up to a point. If you keep on increasing octane, you will being to misfire and lose power. To take advantage of the really high octane stuff (say above 100oct), you will have to revise your fuel and timing maps to account for the race fuel's slower burn rate and reduced initial ignitabiliy.
For example, in our Stage 2 car, running c16 on our pump gas map decreased output by 50whp, causing serious misfire at higher engine speeds. Not until we flipped over to the leaner, more advance, higher boosted race gas map did we get that 50whp back-- plus an additional 120whp
my 2c,
shiv
For example, in our Stage 2 car, running c16 on our pump gas map decreased output by 50whp, causing serious misfire at higher engine speeds. Not until we flipped over to the leaner, more advance, higher boosted race gas map did we get that 50whp back-- plus an additional 120whp
my 2c,
shiv
Evolving Member
Joined: Nov 2003
Posts: 259
Likes: 1
From: philippines
Originally posted by CarPhoto.net
Your wrong stock evo is tuned for 93-94.
It's even stated in the users manual
http://www.CarPhoto.net
Your wrong stock evo is tuned for 93-94.
It's even stated in the users manual
http://www.CarPhoto.net
No i did not lean out anything, I didn't have the SAFC 2 intalled yet. I have it now and I should be going to test and tune wednesday at the track. I'll see if the setting I have set will make a difference with 93 oct. fuel. I'll get a few runs in and then add some 110oct if the pump is open... I'll let you know if it differs, I'll also post my SAFC 2 settings some time tomorrow. I do all my changes on the fly... no dyno in Savannah, I know the weather that day should be around 50 F. Until then.
Evolving Member
Joined: May 2003
Posts: 229
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From: The OC
Originally posted by NOVA EVO
Sooooo...what's the deal??? If I add some toluene or xylene to my tank, will the ECU in the Evo "detect" the higer octane above 93-94 and advance timing for more power or not???
Sooooo...what's the deal??? If I add some toluene or xylene to my tank, will the ECU in the Evo "detect" the higer octane above 93-94 and advance timing for more power or not???