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Old 01-17-2006, 04:42 PM   #1
imma_stocker
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Default octane theory

so i live in texas where we get 93octane gas. and Cobb says to use 91oct map with 93oct gas right. well, i don't know diddly about octane but would it be a good idea to fill up on 93oct with a bottle of octane booster or mix in a little bit of racing gas(101-104 octane) and run the higher octane map? i mean, that won't hurt my motor or anything would it? btw, this is on stg1 with gutted UP and stock everything else(waiting for good deal on TBE ). this is all just theory and concept bcuz i don't wanna fry my heads or anything else but it should be ok for racing ... i mean dyno tests .

by mixing i mean, with a 14gal(low-ball figure err on side of caution) filled with 11gal 93oct and 3gal 104oct they should mix to 14gal ~95oct?
(11/14*93)+(3/14*104)=95ish. sum of each percentage times octane per each type of gas. or whatever the hell octane booster does.
thoughts, opinions?
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Old 01-17-2006, 04:57 PM   #2
hondaeater69
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octane numbers seem correct. it won't hurt anyting, but without tuning for it you'll only be extracting a small portion of it's ability.
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Old 01-17-2006, 04:58 PM   #3
Master2192
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No, I'm pretty sure cobb says use the 91 map first. Then try the 93 octane map and if you have problems go back to the 91. You shouldn't have to use more octane than the map is tuned for, but more won't hurt it.
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Old 01-17-2006, 05:11 PM   #4
imma_stocker
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so using higher octane is in all practicallity pointless seeing as how i would have to spend extra money on race gas or oct booster and reload the higher octane map and i would only get a miniscule amount of power from the $5-10 i would spend. ahhh . . . but there in lies the source of my thoughts. higher octane gas is supposedly better for our engines and turbos as long as they can handle the extra heat hence the WRC running gas that is basically from the pump only higher octane and balls to the wall racers using race gas which again is simply higher octane gas. so wouldn't running 93++oct gas on the 93oct map be good? still though, i will stick to 93oct pump gas with the 91oct map. even though i don't know why i shouldn't use the 93oct map all the time.
thoughts, opinions?
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Old 01-17-2006, 05:16 PM   #5
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i wouldn't say running 95 oct on a 93 map is "good". although it's far from bad, it's more of a waste than anything else. If you have 93 octane, run the 93 map, trust me the map is plenty conservative to handle it. Now, if you have race gas and get a race gas TUNE, that's a different story and worth it. You could get a map made for you AP and only use it once and a while with the race gas. It will net decent gains over the OTS maps.
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Old 01-17-2006, 09:03 PM   #6
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Log the car and see what the IAM is. If it below 16 (WRX) or 1 (Sti) then more octane will result in more power.
If you have a Cobb AP all you need is the Tari logger to check.

TMS
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Old 01-17-2006, 09:36 PM   #7
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i need to monitor the who? with the what? why?

you lost me
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Old 01-18-2006, 12:54 AM   #8
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Well this won't make you feel any less lost, but it will get you started:

http://forums.nasioc.com/forums/show...php?p=12295073

It's from a couple of weeks ago.
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Old 01-18-2006, 11:36 PM   #9
Master2192
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Quote:
Originally Posted by imma_stocker
so using higher octane is in all practicallity pointless seeing as how i would have to spend extra money on race gas or oct booster and reload the higher octane map and i would only get a miniscule amount of power from the $5-10 i would spend. ahhh . . . but there in lies the source of my thoughts. higher octane gas is supposedly better for our engines and turbos as long as they can handle the extra heat hence the WRC running gas that is basically from the pump only higher octane and balls to the wall racers using race gas which again is simply higher octane gas. so wouldn't running 93++oct gas on the 93oct map be good? still though, i will stick to 93oct pump gas with the 91oct map. even though i don't know why i shouldn't use the 93oct map all the time.
thoughts, opinions?
Octane is knock resistance, it doesn't have more energy therefore no more extra heat. All you'd be doing by running the 91 octane map with 93 octane gas is giving yourself more insurance for your engine.
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Old 01-19-2006, 05:11 PM   #10
imma_stocker
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Quote:
Originally Posted by Master2192
Octane is knock resistance, it doesn't have more energy therefore no more extra heat. All you'd be doing by running the 91 octane map with 93 octane gas is giving yourself more insurance for your engine.
then how come my friends neighbor put 104oct race gas into his 4cycle lawnmower and BooM! ? and old guys at the drag strip make jokes about putting that same gas into my car to get one fast run then blow my heads? cuz, yeah, i thought octane was the higher amount of detergents which burn cleaner. but, i'm really slow so . . .
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Old 01-19-2006, 05:18 PM   #11
imma_stocker
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Quote:
Well this won't make you feel any less lost, but it will get you started:

http://forums.nasioc.com/forums/sho....php?p=12295073

It's from a couple of weeks ago.
now i've just decided to never screw with or attempt to screw with my ECU and all it's glory simply to avoid confusing my nuts off and finding my left shoe in the freezer.
too much vocabulary, i think i just forgot British Literature from reading that thread.
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Old 01-19-2006, 05:29 PM   #12
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Quote:
Originally Posted by imma_stocker
now i've just decided to never screw with or attempt to screw with my ECU and all it's glory simply to avoid confusing my nuts off and finding my left shoe in the freezer.
+1 vote for post of the day.

I have tears from laughing so hard.


Thanks
TMS
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