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Old 05-24-2002, 01:47 PM   #1
WRC 555
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Join Date: Jul 1999
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1999 2.5 RS-T RBP
EJ257 Hybrid Link'd

Question 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
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Last edited by WRC 555; 05-24-2002 at 01:54 PM.
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Old 05-24-2002, 02:12 PM   #2
8Complex

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Oddly enough, there is something that we can learn from the guys in FFI -- http://www.i-club.com/forums/showthr...hreadid=176093
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Old 05-24-2002, 02:28 PM   #3
WRC 555
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oopss..should have known to do a search

Thanks.

Overall though..not worth messing with chemicals like that in my opinion.
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Old 05-25-2002, 12:59 PM   #4
RallyNavvie
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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
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Old 05-25-2002, 03:05 PM   #5
8Complex

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Garrett - Didn't they stop making Shadow's before OBD-II came out, though?
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Old 05-25-2002, 06:07 PM   #6
RallyNavvie
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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
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