Alternative Octane Boost?

WRC 555 · 05-24-2002, 01:47 PM

Can anyone verify this? Kinda makes sense and kinda doesnt. Just want to see if anyone has actually tried this.

http://www.supraforums.com/showthrea...threadid=35820

Also:

http://www.gnttype.org/techarea/misc/octanebooster.html

* Registered users of the site do not see these ads.

8Complex · 05-24-2002, 02:12 PM

Oddly enough, there is something that we can learn from the guys in FFI -- http://www.i-club.com/forums/showthr...hreadid=176093

WRC 555 · 05-24-2002, 02:28 PM

oopss..should have known to do a search

Thanks.

Overall though..not worth messing with chemicals like that in my opinion.

RallyNavvie · 05-25-2002, 12:59 PM

Unless you have aftermarket engine management anything beyond regular pump 92-93 RON is useless. Trust me, we did tests on a 2.2 turbo p-body (think it was a Shadow) for octane changes all the way from stock to heavily modified. Higher octane HURTS performance in a car that isn't taking advantage of the higher flashpoint. These people that put 100 RON in their lightly modified Rex's for track days are fooling themselves.

And I didn't read the other threads, but lab-grade tolulene is the ingredient for many rally teams' "witches brew" gas.

~Garrett

8Complex · 05-25-2002, 03:05 PM

Garrett - Didn't they stop making Shadow's before OBD-II came out, though?

RallyNavvie · 05-25-2002, 06:07 PM

MY94 was the last Shadows I think so you may be right. We didn't use OBD-II, just good old-fashioned dyno pulls. 2.2 turbo plant (I think it's a Mopar or Mitsu) in those ran best on 90 RON in stock form. After the guy put a new computer in it and altered a bunch of stuff it ran better on 100 RON. 100 RON in the stock engine dropped about 8 lb/ft of torque and maybe 10 hp. Even 93 RON lost 4-5 lb/ft of torque.

Facts like that are hard to turn away from. I run 92-93 RON in my car because that is what it has been tuned for. I'd have to change maps a little to use different gas safely and efficiently. I thought about tuning a map for 100 RON but can you imagine all the expensive gas I'd have to burn to get the map working well enough to see worthwile power gains?

~Garrett

05-24-2002, 01:47 PM	#1
WRC 555 Scooby Newbie Member#: 94 Join Date: Jul 1999 Chapter/Region: MAIC Vehicle: 1999 2.5 RS-T RBP EJ257 Hybrid Link'd	Alternative Octane Boost? Can anyone verify this? Kinda makes sense and kinda doesnt. Just want to see if anyone has actually tried this. http://www.supraforums.com/showthrea...threadid=35820 Also: http://www.gnttype.org/techarea/misc/octanebooster.html * Registered users of the site do not see these ads. Last edited by WRC 555; 05-24-2002 at 01:54 PM.

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05-24-2002, 02:12 PM	#2
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	Oddly enough, there is something that we can learn from the guys in FFI -- http://www.i-club.com/forums/showthr...hreadid=176093

05-24-2002, 02:28 PM	#3
WRC 555 Scooby Newbie Member#: 94 Join Date: Jul 1999 Chapter/Region: MAIC Vehicle: 1999 2.5 RS-T RBP EJ257 Hybrid Link'd	oopss..should have known to do a search Thanks. Overall though..not worth messing with chemicals like that in my opinion.

05-25-2002, 12:59 PM	#4
RallyNavvie Scooby Specialist Member#: 7113 Join Date: Jun 2001 Chapter/Region: TXIC Location: Minnesotan in Texas Vehicle: 2008 Spec B DGM	Unless you have aftermarket engine management anything beyond regular pump 92-93 RON is useless. Trust me, we did tests on a 2.2 turbo p-body (think it was a Shadow) for octane changes all the way from stock to heavily modified. Higher octane HURTS performance in a car that isn't taking advantage of the higher flashpoint. These people that put 100 RON in their lightly modified Rex's for track days are fooling themselves. And I didn't read the other threads, but lab-grade tolulene is the ingredient for many rally teams' "witches brew" gas. ~Garrett

05-25-2002, 03:05 PM	#5
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	Garrett - Didn't they stop making Shadow's before OBD-II came out, though?

05-25-2002, 06:07 PM	#6
RallyNavvie Scooby Specialist Member#: 7113 Join Date: Jun 2001 Chapter/Region: TXIC Location: Minnesotan in Texas Vehicle: 2008 Spec B DGM	MY94 was the last Shadows I think so you may be right. We didn't use OBD-II, just good old-fashioned dyno pulls. 2.2 turbo plant (I think it's a Mopar or Mitsu) in those ran best on 90 RON in stock form. After the guy put a new computer in it and altered a bunch of stuff it ran better on 100 RON. 100 RON in the stock engine dropped about 8 lb/ft of torque and maybe 10 hp. Even 93 RON lost 4-5 lb/ft of torque. Facts like that are hard to turn away from. I run 92-93 RON in my car because that is what it has been tuned for. I'd have to change maps a little to use different gas safely and efficiently. I thought about tuning a map for 100 RON but can you imagine all the expensive gas I'd have to burn to get the map working well enough to see worthwile power gains? ~Garrett