going from 87-91 octane once tune is installed???

J.Cagle

New Member

Jul 20, 2009

88

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SouthEast Kansas

Nov 16, 2009

#1

• Nov 16, 2009

• #1

Whats the best way to do this? My tune should be this week. I have been keeping my take real low so I can get as much 91 in it when I fill up after the instal of the tune, but with the little bit of 87 left wont the fuel be slightly lower octane and affect the way it runs?

 

kooldawg6

mine works really well and can take a fair amount

Aug 31, 2006

1,679

2

38

Central VA

Nov 16, 2009

#2

• Nov 16, 2009

• #2

Go ahead and fill up with 91. Run it down and fill back up with 91 before the tune and you should be fine. Running 91 in your car now won't hurt anything. It will just waste a marginal amount as it can't combust it all.

 

I

Informant736

New Member

May 22, 2005

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Malvern, PA

Nov 17, 2009

#3

• Nov 17, 2009

• #3

if your expecting to get the tuner soon and dont put that many miles on the car, i would only fill up like 1/3 - 1/2 tank or so with the 91 and run that down then fill up again on 91 before loading the tune. This way your not waiting longer to load the tune because of a full tank of an 87/91 mix of fuel.

 

J.Cagle

New Member

Jul 20, 2009

88

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SouthEast Kansas

Nov 17, 2009

#4

• Nov 17, 2009

• #4

I ran my car til the thing said I had 20 miles left til empty. Which should be about 1 gallon left. I just put 20 bucks of 91octane in a second ago( about 9 gallons). By the time i get the tune and get my intake and stuff put on so I can install the tune I will need to get gas again Im sure and will fill up with 91 then. That should be good don't ya think?

 

kooldawg6

mine works really well and can take a fair amount

Aug 31, 2006

1,679

2

38

Central VA

Nov 18, 2009

#5

• Nov 18, 2009

• #5

That should be fine.

 

TPony

Member

Aug 3, 2006

94

3

8

Aldie, VA

Nov 22, 2009

#6

• Nov 22, 2009

• #6

any of the suggestions above should work fine

 

J.Cagle

New Member

Jul 20, 2009

88

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0

SouthEast Kansas

Nov 22, 2009

#7

• Nov 22, 2009

• #7

I just filled up again with 91. (been doing alot of driving this weekend) I think all the 87 should be flushed out. Its wierd, running 91 has increased my average fuel milage from 21.5 to 23.8. I really thought it would hurt since it wasnt tuned to run on 91. Plus it has turned my exhaust tips black and look nasty.

 

kooldawg6

mine works really well and can take a fair amount

Aug 31, 2006

1,679

2

38

Central VA

Nov 23, 2009

#8

• Nov 23, 2009

• #8

I don't know what the coincidence would be that would increase your mileage Everything should nearly be the same excpet for the fact the engine can't combust all the gas at a higher octane rating. But the black nasty soot is what's not being completely burned up before it leaves the muffler. That also happens when you eliminate the cats a lot of the time regardless of octane/tune.

 

J.Cagle

New Member

Jul 20, 2009

88

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SouthEast Kansas

Nov 23, 2009

#9

• Nov 23, 2009

• #9

Thats what I have heard about running no cats. Looks like Im going to be doing alot of exhaust tip polishing when I decide if an O/R H-pipe adds much power and get one

 

kooldawg6

mine works really well and can take a fair amount

Aug 31, 2006

1,679

2

38

Central VA

Nov 24, 2009

#10

• Nov 24, 2009

• #10

J.Cagle said:

Thats what I have heard about running no cats. Looks like Im going to be doing alot of exhaust tip polishing when I decide if an O/R H-pipe adds much power and get one

Click to expand...

No need to do a lot of polishing! Use a name brand metal cleaner/polish (I've been using Eagle One Nevr-Dull for several years now with no problems) first thing and I use a mesh pad when washing the tips and that is enough to get the residue off on a weekly basis. I only breakdown and repolish them maybe twice a year.

 

J.Cagle

New Member

Jul 20, 2009

88

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0

SouthEast Kansas

Nov 24, 2009

#11

• Nov 24, 2009

• #11

never dull is some pretty good stuff. Also BlueMagic Metal polish is pretty good as well. It works great on aluminum wheels with a mothers powerball.

 

Ken04

New Member

May 24, 2007

235

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0

Vancouver Washington

Nov 24, 2009

#12

• Nov 24, 2009

• #12

J.Cagle said:

Whats the best way to do this? My tune should be this week. I have been keeping my take real low so I can get as much 91 in it when I fill up after the instal of the tune, but with the little bit of 87 left wont the fuel be slightly lower octane and affect the way it runs?

Click to expand...

worse comes to worse you could always throw in a can of octane booster.