tuned for 91 octane, 93 octane, etc?
10-19-2007, 03:02 PM
#2
3rd Gear Member
Join Date: Mar 2007
Location: Philly
Posts: 821
RE: tuned for 91 octane, 93 octane, etc?
A tune for specific octane is mostly a function of ignition spark advance. As you advance ingnition timing you increase the chances of detonation which is the premature combustion of the fuel/air mixture. This could lead to the damaging of vital internal parts. In order to combat this you need to increase the octane rating of the fuel you use. The higher the octane the more resistant the fuel is to premature detonation and the more timing you can run. IIRC the max advance you can get away with on 93 is 15 or 16 degrees.
The primary advantage of advanced timing is more power. With a good 93 octane tune you can see decent gains. If you don't have a tune/advanced timing there is no reason at all to run 91 or 93 in your car.
The primary advantage of advanced timing is more power. With a good 93 octane tune you can see decent gains. If you don't have a tune/advanced timing there is no reason at all to run 91 or 93 in your car.
10-19-2007, 03:43 PM
#4
4th Gear Member
Join Date: Mar 2007
Location:
Posts: 1,148
RE: tuned for 91 octane, 93 octane, etc?
If your car was stock when u bought itmeaning no bolt ons or exhaust u probably have no tune.U also can check your computer in the kick panel(i think thats what they call it)to c if u have a chip in the bottom of it.If u haveno tune u wont c any gains from 87 to 93(maybe 2hp if that)
10-19-2007, 05:59 PM
#6
Join Date: Oct 2007
Posts: 7
RE: tuned for 91 octane, 93 octane, etc?
yea its not worth the dough if you dont have it tuned by a performance chip.
- i mean if your car has been use to the high levels of octane for so long i guess i'd keep it the same but i mean unless otherwise dont even bother
- i mean if your car has been use to the high levels of octane for so long i guess i'd keep it the same but i mean unless otherwise dont even bother
10-20-2007, 01:00 AM
#7
6th Gear Member
Join Date: May 2006
Location: Ohio
Posts: 6,448
RE: tuned for 91 octane, 93 octane, etc?
ORIGINAL: b1ackster
yea its not worth the dough if you dont have it tuned by a performance chip.
- i mean if your car has been use to the high levels of octane for so long i guess i'd keep it the same but i mean unless otherwise dont even bother
yea its not worth the dough if you dont have it tuned by a performance chip.
- i mean if your car has been use to the high levels of octane for so long i guess i'd keep it the same but i mean unless otherwise dont even bother
An easy way to tell if you have a tune since you have 3.73 gears is to find out if your speedo is correct. If it is then make sure you have 3.73 gears first and look to see if you have a speed cal under your center counsel. If not you more then likely have a tune. Just step down fuel levels and drive it till you get to 87 octaneand don't hear any pinging.
10-20-2007, 02:36 AM
#8
3rd Gear Member
Join Date: May 2007
Location:
Posts: 910
RE: tuned for 91 octane, 93 octane, etc?
ORIGINAL: oxfordgt
Strike that, forget you ever read that, that has to be the dumbest things I've heard in refrence to octane levels.
An easy way to tell if you have a tune since you have 3.73 gears is to find out if your speedo is correct. If it is then make sure you have 3.73 gears first and look to see if you have a speed cal under your center counsel. If not you more then likely have a tune. Just step down fuel levels and drive it till you get to 87 octaneand don't hear any pinging.
ORIGINAL: b1ackster
yea its not worth the dough if you dont have it tuned by a performance chip.
- i mean if your car has been use to the high levels of octane for so long i guess i'd keep it the same but i mean unless otherwise dont even bother
yea its not worth the dough if you dont have it tuned by a performance chip.
- i mean if your car has been use to the high levels of octane for so long i guess i'd keep it the same but i mean unless otherwise dont even bother
An easy way to tell if you have a tune since you have 3.73 gears is to find out if your speedo is correct. If it is then make sure you have 3.73 gears first and look to see if you have a speed cal under your center counsel. If not you more then likely have a tune. Just step down fuel levels and drive it till you get to 87 octaneand don't hear any pinging.
i concur. Octane rating is the fuel's resistance to igniting,so you run a higher octane to prevent detonation due to advanced timing.
10-20-2007, 02:51 AM
#9
5th Gear Member
Join Date: Sep 2004
Location:
Posts: 3,145
RE: tuned for 91 octane, 93 octane, etc?
ORIGINAL: cammed99gt
If your car was stock when u bought itmeaning no bolt ons or exhaust u probably have no tune.U also can check your computer in the kick panel(i think thats what they call it)to c if u have a chip in the bottom of it.If u haveno tune u wont c any gains from 87 to 93(maybe 2hp if that)
If your car was stock when u bought itmeaning no bolt ons or exhaust u probably have no tune.U also can check your computer in the kick panel(i think thats what they call it)to c if u have a chip in the bottom of it.If u haveno tune u wont c any gains from 87 to 93(maybe 2hp if that)
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