Octanes and tunes.
12-19-2010, 07:35 AM
#12
6th Gear Member
You don't want to cause engine ping. The lighter the load, the less likely it'll ping/knock. Mixing different octanes is acceptable. 1/2 tanks of 87 and 93 will yield an equivalent 90.
12-19-2010, 07:40 AM
#13
5th Gear Member
Thread Starter
Join Date: May 2010
Location: Ohio
Posts: 2,228
So by what everyone is telling me, I really should just siphon the gas out. Driving with 87 seems like a bad idea. Would a shop be able to drain the gas?
12-19-2010, 07:50 AM
#14
6th Gear Member
Our fuel tank design makes it difficult to put a siphon hose thru the filler tube but a shop could probably do it. But I think you would be fine for a bit just taking it easy and listening for ping/knock. Even if you refill with 93 at 3/4 tank you'll have close to 89 (~88.5).
You could always pull some timing with the tuner.
You could always pull some timing with the tuner.
12-19-2010, 07:55 AM
#15
6th Gear Member
Join Date: May 2005
Location: MD/WV
Posts: 5,736
Don't our cars have an anti-siphon mechanism in the fillerhose?
How low was the tank when she filled it? If it was like half tank of 89, and she put 87 in it, then you're only like 1 point off. Just saying, it's probably not as bad as you think..
How low was the tank when she filled it? If it was like half tank of 89, and she put 87 in it, then you're only like 1 point off. Just saying, it's probably not as bad as you think..
12-19-2010, 07:57 AM
#16
4th Gear Member
Join Date: Jun 2010
Location: Arkansas
Posts: 1,150
I think I would drive it until you have 1/2 tank and fill up with 93 octane. Just just keep the rpm's down as much as possible and accelerate slowly. Listen for the ping and if you hear it do something different. Not a huge deal!
12-19-2010, 09:50 AM
#17
4th Gear Member
Join Date: Jul 2008
Location: Germantown, TN
Posts: 1,347
Do you have an 87 octane tune? You could put your stock intake and tune back on. You could also drive like a grandpa with your current set up. If you hear a can of marbles rattling get off the throttle. Whatever you do don't put octane booster in, it will foul your plugs.
If you are still concerned do a google on toulene, octane, pump gas. You will find the amount of toulene needed to bring your octane up.
If you are still concerned do a google on toulene, octane, pump gas. You will find the amount of toulene needed to bring your octane up.
12-19-2010, 02:08 PM
#18
5th Gear Member
Thread Starter
Join Date: May 2010
Location: Ohio
Posts: 2,228
No, no. You misunderstand. I just tuned my car, and it has an 89 tune. But I have almost a tank of 87.
12-19-2010, 03:50 PM
#20
6th Gear Member
Join Date: May 2005
Location: MD/WV
Posts: 5,736
If you had 89 in the tank and your mom put 87 in the tank, unless you were running on fumes, there was still some 89 in the tank which would have mixed with the 87 and raised the octane level... Your probably fine to run it.
Just do like everyone has said, run a few gallons out of it and put some high-test in it to get the octane rating back up.
