iv been running like this for a while im juist curious?????? also what will give me the most acceleration 89,91,or 93
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2005 gt mods include c&L intake,steed ud pullies, violator x pipe w/flowmaster mufflers,hurst shifter,custom tune by evolution motorsports.
319 hp 333 tq rearwheel!!
aperance mods include. xeon side scoops with louvers,classic chin spoiler,shaker hood scoop,18x10 rear and 17x9 front wheels.painted stripes!
I don't think you'd have a problem, if there was one you'd know it by now.
The thing about octane is if your engine doesn't NEED it, running high octane will actually make it slower. High octane fights off detonation by slowing down the burn process and if it's in a stock engine, then it won't burn as explosively. But if it's tuned for the 93, then use that since the timing will be advanced for it.
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It won't hurt, just won't give you any benefits if the tune is set for 93. Now on the opposite side, if you had a tune for 91 and used 87, that would be very bad for the plugs, which is due to a lean condition. The timing is advanced for higher octane fuel.
The higher the octane with the proper tune will result in added HP. 93 vs 87
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2006 GT Tungsten Grey 5 spd, Xcal2/Pipeline CAI, Powerhouse tune. Spoiler delete. Front Speakers:Infinity 6812CF;Blaupunkt GTc652. Rear:Infinity Kappa 682.7CF. H/U:Alpine CDA-9885. Alpine MRP-F250 amp. Sequentials. President of the Splash guard registry. On Deck: Motoblue UDP's.
no the car seems to run stronger this way to me... i can tray to use 91 fuel for the 91 tune. should i try this.. or should i keep using the 93 91 tune using 93 octane????? in otherwords will it be better to use 91 on 91
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2005 gt mods include c&L intake,steed ud pullies, violator x pipe w/flowmaster mufflers,hurst shifter,custom tune by evolution motorsports.
319 hp 333 tq rearwheel!!
aperance mods include. xeon side scoops with louvers,classic chin spoiler,shaker hood scoop,18x10 rear and 17x9 front wheels.painted stripes!
Not really sure that I understand this...Your spending money on 93 octane gas, why not just run a 93 octane tune? That would eliminate your question and there will be no question of you possibly damaging your engine. No idea why you would even mess with 91 octane tune and not use the corresponding gas for it
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-A7X- ~Stang Syndicate Boston~*2006 Torch Red GT*10/10/07 Performance:Borla FRPP Stingers w/ True Dual Midpipes, Magnaflow High Flow Cats, JLT CAI, Bama 93 Race Tune, Ford Racing 4.10 Gears, Nitto 555 Extremes. Visual: Black AVS Tail Light Trim, Honeycomb Tail Light Vinyl, Black Racing stripes, 35% Window Tint, Trunk Blackout Panel, Billet Antenna Delete, Mirror Covers, 17" Konig "Further" Rims, Quarter Window Louvers, 20% Tinted Head Light/Turn Signal, Boss C-Stripes, CS/GT C-Scoops.
I use 93 with 93 tune, except when i go for service, then drop on the OEM box and return to stock tune, for the service still have 93 in the tank, then revert back to my CAI after service.
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I've seen many TC's and other forced induction come with an sct with a 91 octane tune due to its universal ability to purchase 91 octane fuel in the US. I, personally think that if not NA and running a canned tune that it would be smart to run 93 on the 91 tune until professionally tuned for your specific car. I know you'll give up a few ponies, but it will also help in keeping detonation away.
just my little off topic .02
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'06 GT---Mods---Tunable Inductions Intake, Fully Polished Pypes Violator Mufflers, MAG Mirror Inserts, Sequential Tail Lights, CDC Hood Struts, Powder Coated Valve Covers, Window Tints, Pioneer Premier DEH-P880PRS Head Unit, 8" Kicker Door Subs (SSMB8)
Front: Infinity mids/tweets 6812cf; Rear: Polk db570 mids/tweets------ Awaiting Install ---Eibach Pro Kit, DSpecs
I seem to remember someone saying something to the effect that the octane number has some correlation as to how far the gas can be compressed before it detonates(ie, 87 can be compressed less than say 93 before combusting). This true?
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2005 Black GT Whipple HO | Oil Seperator | Steeda Tensioner | 93 dyno tune | Autometer Cobalt | GTAs
no the car seems to run stronger this way to me... i can tray to use 91 fuel for the 91 tune. should i try this.. or should i keep using the 93 91 tune using 93 octane????? in otherwords will it be better to use 91 on 91
Seems to?
Try to use 91?
So, have you used 91 with the 91 tune?
If I'm reading this correctly, you've only used 93 since you put in the 91 tune.
Of course it's going to run stronger, you've put in a better tune than stock, and have at least (actually higher) the minimum octane for the tune.
You are just pissing away money with the 93 without a tune for it.
Me, I use the 91 tune........because we don't freakin' have 93 octane where I live.
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C&L CAI...Diablosport Predator performance tune...Flowmaster series 40 mufflers...FRPP 4.10 Gears
does it hurt using 93 octane with a 91 tune? 
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