100 Octane
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100 Octane
Everyone is saying that the STi would far exceed the estimated 300HP if you add a higher octane like 100. I know a gas station down the road that sells it, so does that mean i can fill the STi up with 100 octane and get a greater HP rating but without hurting anything? Would it be totally safe to put it in the gas tank?
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Re: 100 Octane
[QUOTE]Originally posted by dynamicmaxima
Everyone is saying that the STi would far exceed the estimated 300HP if you add a higher octane like 100. I know a gas station down the road that sells it, so does that mean i can fill the STi up with 100 octane and get a greater HP rating but without hurting anything? Would it be totally safe to put it in the gas tank? [/QUOTE
The maximum octane rating for the sti is 93.
Anything over that would be questionable. If you
up-grade your ecu, with higher boost levels comes
higher octane. This would be okay with different
ecu settings, but first I'd get the ecu.
Everyone is saying that the STi would far exceed the estimated 300HP if you add a higher octane like 100. I know a gas station down the road that sells it, so does that mean i can fill the STi up with 100 octane and get a greater HP rating but without hurting anything? Would it be totally safe to put it in the gas tank? [/QUOTE
The maximum octane rating for the sti is 93.
Anything over that would be questionable. If you
up-grade your ecu, with higher boost levels comes
higher octane. This would be okay with different
ecu settings, but first I'd get the ecu.
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Octane
Higher Octane almost ALWAYS benefits high-boost turbo vehicles.
Most ecu's will monitor knock, usually at any sign of knock, the car will retard timing, the ECU learns and keeps timing retarded to prevent future misses, this is why resetting your ecu when filling up w/ higher octane gas will usually ALWAYS improve performance, the ECU "forgets" its previous learnings, giving you a fresh fully advanced ECU map.
With the higher octane, the car will knock less (or not at all) - resulting in the ecu NEVER learning to retard timing. SO.. even on a stock car, the STI should gain some performance (or lose less performance over the course of the tank of HIGH octane gas)
So, yes, higher octane is almost always good (if not 100% always good).
Most ecu's will monitor knock, usually at any sign of knock, the car will retard timing, the ECU learns and keeps timing retarded to prevent future misses, this is why resetting your ecu when filling up w/ higher octane gas will usually ALWAYS improve performance, the ECU "forgets" its previous learnings, giving you a fresh fully advanced ECU map.
With the higher octane, the car will knock less (or not at all) - resulting in the ecu NEVER learning to retard timing. SO.. even on a stock car, the STI should gain some performance (or lose less performance over the course of the tank of HIGH octane gas)
So, yes, higher octane is almost always good (if not 100% always good).
Last edited by WRCPOWER; Feb 2, 2003 at 05:08 PM.
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Re: Octane
Originally posted by WRCPOWER
Higher Octane almost ALWAYS benefits high-boost turbo vehicles.
Most ecu's will monitor knock, usually at any sign of knock, the car will retard timing, the ECU learns and keeps timing retarded to prevent future misses, this is why resetting your ecu when filling up w/ higher octane gas will usually ALWAYS improve performance, the ECU "forgets" its previous learnings, giving you a fresh fully advanced ECU map.
With the higher octane, the car will knock less (or not at all) - resulting in the ecu NEVER learning to retard timing. SO.. even on a stock car, the STI should gain some performance (or lose less performance over the course of the tank of HIGH octane gas)
So, yes, higher octane is almost always good (if not 100% always good).
Higher Octane almost ALWAYS benefits high-boost turbo vehicles.
Most ecu's will monitor knock, usually at any sign of knock, the car will retard timing, the ECU learns and keeps timing retarded to prevent future misses, this is why resetting your ecu when filling up w/ higher octane gas will usually ALWAYS improve performance, the ECU "forgets" its previous learnings, giving you a fresh fully advanced ECU map.
With the higher octane, the car will knock less (or not at all) - resulting in the ecu NEVER learning to retard timing. SO.. even on a stock car, the STI should gain some performance (or lose less performance over the course of the tank of HIGH octane gas)
So, yes, higher octane is almost always good (if not 100% always good).
i have no idea of how ECUs work..
thx..
isn't HIgh octane is required for an engine that requires or benefits from a higher compression ratio??
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KNOCK KNOCK?
Knock, mis-fires, etc, premature-ignition - caused by too much heat/pressure for the fuel octane rating -- among other things.
Yes, higher-compression-engines need higher octane as a general rule, by F.I'ing a car, you are in essence increase displacement and compression (since you no longer are dealing in normal atmospheric pressures).
ECU's, in most modern cars, maps timing, afr (mostly air metering) etc. As your car operates, it learns things ranging from your driving habits, to its own timing curves, and other things.
Over time if your Fuel Press. drops, or you have a dirty engine, things tend to LEAN out as far as fuel delivery, causing "KNOCKS" if this happens your ecu will retard timing to save the engine - having a negative effect on performance.
Also, you can induce knock by increasing boost pressure, or running plugs that may be too hot for your boost applications, etc etc.
SO, in general, a higher rated fuel, can help fight the loss of performance, as well as making a safer internal enviroment for higher boost applications.
ALL OF WHICH ARE GOOOOOD.
=D
Yes, higher-compression-engines need higher octane as a general rule, by F.I'ing a car, you are in essence increase displacement and compression (since you no longer are dealing in normal atmospheric pressures).
ECU's, in most modern cars, maps timing, afr (mostly air metering) etc. As your car operates, it learns things ranging from your driving habits, to its own timing curves, and other things.
Over time if your Fuel Press. drops, or you have a dirty engine, things tend to LEAN out as far as fuel delivery, causing "KNOCKS" if this happens your ecu will retard timing to save the engine - having a negative effect on performance.
Also, you can induce knock by increasing boost pressure, or running plugs that may be too hot for your boost applications, etc etc.
SO, in general, a higher rated fuel, can help fight the loss of performance, as well as making a safer internal enviroment for higher boost applications.
ALL OF WHICH ARE GOOOOOD.
=D
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