| ![]() | ||||||||||||
| |||||||||||||
|
|||||||
Discussing A Question of Octane in the V6 Mustangs Forum. I just wonder what everyone here thinks of the octane ratio for their Mustangs? I ... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
|
|
LinkBack | Thread Tools |
|
|
#1 |
|
Regular
I'm gone.
Join Date: Oct 2009
Posts: 112
|
A Question of Octane
I just wonder what everyone here thinks of the octane ratio for their Mustangs?
I checked MSN for the MPG on my car and it was 16MPG. When I purchased the car, I was getting about 12-14. So I put in some STP Octane Boost (yknow, the junk that claims it has jetfuel in it, which is just kerosene) and it helped, I was going from 12-14 to 16. It was $4 a bottle and I wondered one weekend, why not skip it in and see. Maybe I just had some older gasoline. I noticed after 2 fill ups on 87 octane, there was some black corrusion starting on the end of the tailpipe. I read on another Mustang board, that a higher octane would only matter if you were tuned for it. The next week, I went from 87 to 93 and since then, the corrusion hasnt come back (I cleaned it off with a metal pad) and Im geting 16-17 MPG in the city. Opinions, stories of the like? |
| Sponsored Links | Remove Advertisements |
| Forums at Modded Mustangs Advertisement |
|
|
#2 |
|
Regular
2000 3.8L v6
when i finished track was closed
Join Date: Dec 2008
Location: Houston
Posts: 112
|
I've never tested all that out but I've always heard that premium is more efficient in cars and burns cleaner, but I've also heard it burns faster. So that's cool you get better gas mileage I would have thought it would make the corrosion stop but bring your mileage down
|
|
|
#3 | |
|
Devil's Advocate
'98 Cobra/'90 GT 'vert
Join Date: Jan 2007
Location: Santa Rosa, CA
Posts: 3,836
|
Most modern cars will advance the timing until they detect knock, which means that if you run higher octane fuel they'll run more advanced. That's where you get the increases in efficiency.
__________________
War is Peace || Freedom is Slavery || Ignorance is Strength Founder of the DMC |
|
|
|
#4 |
|
Enthusiast
2000 gt
Join Date: Feb 2009
Location: La grange, KY
Posts: 963
|
unless your car has knock sensors (only shelby's have them as far as mustangs go) then there really is no advancing timing in our mustangs based on detonation. it will advance under cooler weather, and retard under warmer weather.
__________________
Procharged 2000 5 Speed BAB GT, 7.3 lbs, 368 hp, 406 rwtq.HARDCORE CREW |
|
|
#5 | ||
|
V-SICKS
00 V6 & 09 GT
13.37@104.4mph--BONE stock GT
Join Date: Aug 2006
Location: south florida
Posts: 15,657
|
![]() ![]() The car and computer are electronically controled and programed. They dont have a mind of their own and say hey lets advance the timing under this load even though it was never programed for that. Why do you think hand held tuners such as Diablo, SCT and other actually increase power? because they increase timing and other super safe features the factory programs the car too. lol basically what was being said is the car tunes itself....lol soooo why do I need a tune for my turbo? shouldnt the computer know the timing and the MAF know to add fuel for pressure?
__________________
![]() The Devil & The Daily Daily-13.37@104.4mph V6- Stock bottom-439rwhp & 402rwtq 12psi 100oct built motor-497rwhp & 508rwtq 15psi pump |
||
|
|
#6 |
|
Sonic Blue FTGDMFW!!!
2004 Mustang v6
10.73 1/8th mile
Join Date: Apr 2007
Location: Portland, TN
Posts: 3,560
|
^
i dunno about anything they said...but i did notice a better MPG from upgrading to 89 from 87...just a few though nothing major...i haven't gone back to 87 since...
__________________
2004 Mustang 3.9 v6 K&N - True Dual Thrush Welded Exhaust - 5k HIDs - Show car shine 24/7 Fuckers
|
|
|
#7 |
|
Hardcore Enthusiast
69
Join Date: Apr 2008
Location: richmond/deltaville, va
Posts: 2,843
|
Damn watru that's some shitty mpg. Do you have forced induction, or are you gunning it everywhere you go? I get between 18 and 20 in the city, and that's having fun with it.
__________________
steeda UDP, steeda CAI, xcal3 w/ 93oct tune, 3.73's, tlok magnaflow exhaust is in, dunno when it will be installed. The unexamined life is not worth living. |
|
|
#8 |
|
Regular
I'm gone.
Join Date: Oct 2009
Posts: 112
|
Eh its the EPA rating 16MPG per city. Nope, I dont gun it. I just do alot of city driving. I do have the stock CAI, which Im going to change soon. And I didnt just do a fuel system cleaning.
|
|
|
#9 |
|
Newbie
Join Date: Oct 2009
Posts: 2
|
wow...put a good exhaust or something on there....I average 24 mpg with bolt ons..
only the latest 05+ GT's with those spanish oak computers actually react to octane in fuel, its documented that jumping from regular to premium actually can up output...but only by maybe 2 hp... your car will have no idea there's any different fuel in there, however, you may be getting crappy gas, I usedto run mid-grade 89 octane because the car would ping a little on regular from sunoco gas, I switched to the local citgo station and dropped back to 87...and not a sound |
|
|
#10 |
|
Newbie
Join Date: Apr 2009
Posts: 17
|
i have a predator in mine so i run 93. slight increase in mileage. barely noticable.
|
|
|
#11 | |
|
Devil's Advocate
'98 Cobra/'90 GT 'vert
Join Date: Jan 2007
Location: Santa Rosa, CA
Posts: 3,836
|
The algorithm for cars with a knock sensor is that every firing cycle they incrementally advance the timing some set amount until knock is detected, then they retard it some larger amount. The timing is never constant while the engine is running, it's always being advanced or retarded based on what happened the previous firing cycle. If Mustangs aren't equipped with a knock sensor, then obviously they wouldn't be capable of this sort of adaptive timing. I'm guessing that at least 3Vs are, though, as dyno pulls with high octane show a hp increase over pulls with 87.
__________________
War is Peace || Freedom is Slavery || Ignorance is Strength Founder of the DMC |
|
|
|
#12 | |
|
Regular
I'm gone.
Join Date: Oct 2009
Posts: 112
|
|
|
|
|
#13 |
|
Regular
2003 V6 Mustang
15.1 @ 91
Join Date: Jun 2008
Location: NC
Posts: 439
|
please define complete fuel system cleaning?
__________________
MAC LTs, BBK Shorty H, MAC Catback, BBK CAI, Xcal3 93 octane tune, SFCs, Rear Seat Delete, 8.8 Rear w/4.10 gears, Tokico shocks/struts, Eibach Pro Kit, Steeda 3 bolt CC plates, Steeda bumpsteer kit, 25% ASP Underdrive pulley (crank) |
|
|
#14 |
|
Hardcore Enthusiast
KB'd GT
Join Date: Nov 2006
Location: San Diego
Posts: 2,436
|
You will not see an increase in mpg with higher octane unless the vehicle has knock sensors. What you are seeing is just chance. You need to drive the exact same roads, and fill up at the same PUMP at the same station to get any accurate mpg data. Go for at least 2-3 tanks and then change something.
__________________
SCT Tuning, JLT intakes, Aeroforce OBDII gauges and PLX wideband products @ Trick Tuners My forumsXcal3 SF with preloaded tunes and free custom tunes for life for $379 shipped. Custom tunes based on actual data is extra. |
|
|
#15 |
|
Regular
I'm gone.
Join Date: Oct 2009
Posts: 112
|
As I was told, guy at work does car repair..
Flushed rails, checked seals, clean injectors, decarbonized, clean throttle body by handle w/kerosene, replaced 9 year old stock fuel pump, dropped fuel tank, resealed it, drained tank, cleaned all sediment out, repressurized the lines. |
![]() |
| Thread Tools | |
|
|
Threads Similar to: A Question of Octane
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| OCTANE question | Dr BlackStang | 2005+ | 7 | November 16th, 2008 12:51 PM |
| High Octane Tune Question | MamaStang | 2005+ | 2 | August 27th, 2008 06:02 PM |
| Intake and octane question. | gragra73 | 2005+ | 5 | April 29th, 2008 01:37 PM |
| Which Octane? | bostonbands | 2005+ | 4 | December 2nd, 2006 11:05 PM |
| Fuel Octane Question | zreg | Classic Mustangs | 5 | December 1st, 2006 09:36 PM |