Is it safe to use 91 Octane on a 93 tune?
03-25-2010, 08:17 PM
#2
4th Gear Member
Join Date: Mar 2009
Location: NC
Posts: 1,909
i mean, YES, you can run 91... but you cant drive it like a bat out of hell. You might get some pinging too. You need to tune your car for 91 now, until then drive the car on 91 like you would your grandma's clunker.
03-25-2010, 09:17 PM
#3
1st Gear Member
Thread Starter
Join Date: Jun 2009
Location: Oklahoma
Posts: 98
03-25-2010, 10:13 PM
#6
1st Gear Member
Thread Starter
Join Date: Jun 2009
Location: Oklahoma
Posts: 98
well its probably not going to be much more expensive than buying 93... i mean its a couple bucks for octane booster, and if 93 was ten cents more than 91 it would be a couple dollars extra to fill up on 93. It would just be a pita and i just wanna know if octane booster actually works
03-25-2010, 10:15 PM
#7
4th Gear Member
Join Date: Mar 2008
Location: asdf
Posts: 1,600
What tuning software are you using?
I think with Sniper the 87, 91, and 93 octane tunes only raise timing 2* for safety and liability unless you manually raise timing more yourself. So in reality with Sniper you could use any gas. I don't know if SCT or Diablosport work like this as well.
I think with Sniper the 87, 91, and 93 octane tunes only raise timing 2* for safety and liability unless you manually raise timing more yourself. So in reality with Sniper you could use any gas. I don't know if SCT or Diablosport work like this as well.
Last edited by vanquish; 03-25-2010 at 10:34 PM.
03-26-2010, 04:11 PM
#10
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
There's really no such thing as an 87, 91, or 93 octane tune; it all depends on how aggressively the spark timing was set, and to far lesser extent how the AFR at WOT was tweaked.
An aggressive tune, established for 93 octane fuel, would ping a great deal at WOT and high loads with 91 octane--a less aggressive tune might not.
As to the cost of running 93 vs. 91, vs. octane booster, the tanks is 15.6 gallons so if it were dead empty, at 10¢ a gallon difference that's whopping $1.56--about the same or less than a single draft beer at a one of the sleazier biker bars in Port Orange...
An aggressive tune, established for 93 octane fuel, would ping a great deal at WOT and high loads with 91 octane--a less aggressive tune might not.
As to the cost of running 93 vs. 91, vs. octane booster, the tanks is 15.6 gallons so if it were dead empty, at 10¢ a gallon difference that's whopping $1.56--about the same or less than a single draft beer at a one of the sleazier biker bars in Port Orange...