what octane gas?
04-17-2004, 09:59 AM
#6
04-17-2004, 11:57 AM
#7
Senior Member
Join Date: Jun 2003
Posts: 249
Originally Posted by Monotaur
There is a place in Springfield, MO that has 120 octane though... a few months ago it was about $4.25 a gallon too.
I've only used premium... 91 sometimes 92 depending on the station. Out here in the west we get screwed.
04-17-2004, 09:15 PM
#10
Supporting Maxima.org Member
Join Date: Oct 2003
Location: Denver, CO
Posts: 943
Originally Posted by KCmaxx
04-17-2004, 09:57 PM
#11
Guest
Posts: n/a
Originally Posted by KCmaxx
where do you find 93 in KC?
I can only find 92, and that is only at BP/Amoco.
my 5th gen could use some 93 octane love..
-vq
04-17-2004, 11:29 PM
#12
Senior Member
Join Date: Jun 2003
Location: a meadow south of Atlanta
Posts: 8,143
biggestbelly - Whatever octane you settle on, do not switch back and forth. The Maxima computer takes several tankfuls to adjust between octanes, so frequent switching means the engine does not get fully adjusted to one octane before another is put in the tank.
04-20-2004, 03:21 PM
#15
always use highest octane because the engines are new and also high octane takes longer to burn so it wont waist as fast yet it creates a better combustion which means more response, hp ratio from your engine. Some engines wont even start with low octane, but to be on the safe side and if you really want your car to run great over time then use 93-94 octane.
04-23-2004, 07:17 PM
#16
Dyno plot says I have the most area under the Administrator curve
Join Date: Jul 2001
Posts: 7,060
Originally Posted by SMX95
always use highest octane because the engines are new and also high octane takes longer to burn so it wont waist as fast yet it creates a better combustion which means more response, hp ratio from your engine. Some engines wont even start with low octane, but to be on the safe side and if you really want your car to run great over time then use 93-94 octane.
04-24-2004, 04:03 AM
#18
heres a direct quote from another car forum. "on most cars that are rated for use of 87 octane, there is no benefit to using higher octane fuel. the higher octane is basically a slower burning fuel so that it won't detonate (knocking) prematurely."
Im not looking to start any flaming i do mechanics in my school been doing it for 3 yrs and know for a fact that higher octane burns slower than 89 or less octane. Be my guest and do a research but that "LOL" and "where did u get that crap from" wasnt needed. Just do a research before you want to start up a flame.
http://forums.vwvortex.com/zerothread?id=1313222
Somewhere in the middle
Im not looking to start any flaming i do mechanics in my school been doing it for 3 yrs and know for a fact that higher octane burns slower than 89 or less octane. Be my guest and do a research but that "LOL" and "where did u get that crap from" wasnt needed. Just do a research before you want to start up a flame.
http://forums.vwvortex.com/zerothread?id=1313222
Somewhere in the middle
04-24-2004, 04:08 AM
#19
heres another quote from a MPT forum "Fuel with higher octane ratings burn slower...that's IT. Buring slower allows the timing to be advance for better performance."
http://forum.mpt.org/messages/9/2448.html?1063044185
Scroll all the way down
http://forum.mpt.org/messages/9/2448.html?1063044185
Scroll all the way down
04-24-2004, 04:16 AM
#20
this quote has to deal with gains of higher octane and the knocking noise i mentioned.
High octane fuels allow engines to produce more power because they allow more spark advance before pre-ignition occurs. It is of no benefit to put 100 octane fuel into an engine that doesn't have the spark advance dynamic range to take advantage of it.
Under warm cruise (closed loop) strategy, EEC will push the spark advance out to the point where trace knock is detected, and then back the timing off slightly, to keep away from pre-ignition. This strategy makes sense to get the most efficient burn and the most power. Under these conditions, you may hear some knock if you mash the gas, because it takes EEC a few CPU machine cycles and crankshaft rotations to drop out of closed-loop strategy and retard the timing.
Under wide-open-throttle (WOT) conditions, EEC is not looking at the knock sensor because the engine is simply making too much noise for the knock detection strategy to filter out the knock signal from the noise. Timing and fuel for WOT is derived from lookup tables that are vectored primarily by crankshaft RPM and engine coolant temperature, and to a much lessor degree by the mass air signal.
Under most conditions, EEC should be able to get the most out of any reasonable fuel that you pump into the tank, however, an especially bad load might be beyond the range that the spark lookup tables can compensate for, so pulling the octane shorting bar invokes a new set of tables, with less aggressive spark advance curves for WOT operation.
http://www.shotimes.com/SHO3gas.html
Im done doing research.
Take care and I hope you both understand that higher octane does burn slower.
High octane fuels allow engines to produce more power because they allow more spark advance before pre-ignition occurs. It is of no benefit to put 100 octane fuel into an engine that doesn't have the spark advance dynamic range to take advantage of it.
Under warm cruise (closed loop) strategy, EEC will push the spark advance out to the point where trace knock is detected, and then back the timing off slightly, to keep away from pre-ignition. This strategy makes sense to get the most efficient burn and the most power. Under these conditions, you may hear some knock if you mash the gas, because it takes EEC a few CPU machine cycles and crankshaft rotations to drop out of closed-loop strategy and retard the timing.
Under wide-open-throttle (WOT) conditions, EEC is not looking at the knock sensor because the engine is simply making too much noise for the knock detection strategy to filter out the knock signal from the noise. Timing and fuel for WOT is derived from lookup tables that are vectored primarily by crankshaft RPM and engine coolant temperature, and to a much lessor degree by the mass air signal.
Under most conditions, EEC should be able to get the most out of any reasonable fuel that you pump into the tank, however, an especially bad load might be beyond the range that the spark lookup tables can compensate for, so pulling the octane shorting bar invokes a new set of tables, with less aggressive spark advance curves for WOT operation.
http://www.shotimes.com/SHO3gas.html
Im done doing research.
Take care and I hope you both understand that higher octane does burn slower.
Thread
Thread Starter
Forum
Replies
Last Post
My Coffee
New Member Introductions
15
06-06-2017 02:01 PM