• Sign Up! To view all forums and unlock additional cool features

    Welcome to the #1 Fiesta ST Forum and Fiesta ST community dedicated to Fiesta ST owners and enthusiasts. Register for an account, it's free and it's easy, so don't hesitate to join the Fiesta ST Forum today!

91 vs. 93

Messages
186
Likes
50
Location
Menasha
#1
So on my 16' fiesta ST ive had consistent worse performance on 93 as opposed to 91. Doesnt matter which map i have flashed in from my accessport. (Currently playing with cobbs maps, and its currently on the most recent update)

Any ideas as to why im experiencing the opposite of what everyone else has gotten?
 

Quisp

Senior Member
Messages
985
Likes
284
Location
Davenport
#2
I believe it's been said the 91 Cobb maps have a more aggressive feel than the 93. Go with one of the off the shelf custom tune.than both the Coobb tunes will feel weak ������
 

TyphoonFiST

4000 Post Club
Messages
4,559
Likes
1,355
Location
Rich-fizzield
#3
So on my 16' fiesta ST ive had consistent worse performance on 93 as opposed to 91. Doesnt matter which map i have flashed in from my accessport. (Currently playing with cobbs maps, and its currently on the most recent update)

Any ideas as to why im experiencing the opposite of what everyone else has gotten?
Dizzy tunes or Stratified flash tunes...end of story here.[clap]
 
OP
PunkST
Messages
186
Likes
50
Location
Menasha
Thread Starter #4
Problem is i have no ability to get a tune. No laptop, or PC. And not a lot of budget to play with the car much. ( got the AP used) so in other words im pretty much stuck with a car that runs like garbage on "the right fuel" and ok ish on 91. Sigh.
 

TyphoonFiST

4000 Post Club
Messages
4,559
Likes
1,355
Location
Rich-fizzield
#6
Problem is i have no ability to get a tune. No laptop, or PC. And not a lot of budget to play with the car much. ( got the AP used) so in other words im pretty much stuck with a car that runs like garbage on "the right fuel" and ok ish on 91. Sigh.
Do you have an email? Is there a local library near you? You could load it there at the library on their computer or use a neighbor's or families computer at their house. It's so worth it man....I dont think you understand the step up you get with Flash tunes...compared to COBB. OTS .


Sent from my SM-N950U1 using Tapatalk
 
OP
PunkST
Messages
186
Likes
50
Location
Menasha
Thread Starter #7
Well ive tried the following now, AP has been updated with V5. I filled with 93 an chucked some octane booster in to compensate for the bit of 91 no ethanol left in the tank. Its on stock motorcrafts with .027 gap and loaded the 93 stage 3 slot. Seems to be acting ok currently.
 
#8
Hey just wanted to jump in on this. I know it is not our tune but still just wanted to let you guys know you should not use octane booster or additives in fuel on these ecoboost engines. In the owner's manual it will state that information. Also I am trying to figure out how 93 is giving you worst performance. Now even if lets say there 91 tune is more aggressive then 93 running the 91 tune with 93 octane gas should still give you a better result. Now in our tunes if you put in a higher octane then what is in tune it will advance timing on its own when seeing higher octane. But in general you should always get more power and better economy off of a higher octane.
 
Messages
862
Likes
429
Location
Laguna beach
#9
Well ive tried the following now, AP has been updated with V5. I filled with 93 an chucked some octane booster in to compensate for the bit of 91 no ethanol left in the tank. Its on stock motorcrafts with .027 gap and loaded the 93 stage 3 slot. Seems to be acting ok currently.
octane booster is a no-no. other than the deleterious effects to your fuel system, its also only a point increase. as in increases octane by a number to the right of the decimal point.
 
Messages
75
Likes
12
Location
boonieville
#10
octane booster is a no-no. other than the deleterious effects to your fuel system, its also only a point increase. as in increases octane by a number to the right of the decimal point.
Damn. I knew that octane boosters didn't do a huge amount of stuff, but I didn't realize that they are less than useless.
Fancy looking bottles for snake oil.[:(]
 

Ford ST

Senior Member
Messages
934
Likes
491
Location
Pleasant Garden
#11
Messages
36
Likes
19
Location
Tulsa
#13
There honestly shouldn't be much of any difference between the 91 and 93 tune, they're nearly identical in terms of performance. I don't have a FiST Cobb tune with me at the moment but comparing the FoST 91 and 93 Cobb tunes the only difference is the 93 tune runs a whopping 1 degree more timing (globally for some reason) than the 91 tune. I can almost guarantee it is the same case for the FiST tunes.
 

Ford ST

Senior Member
Messages
934
Likes
491
Location
Pleasant Garden
#14
That applies to nearly every additive for vehicles, to be fair. Just save your money!
I've seen some impressive stuff. I've seen engine oil consumption massively reduced, oil leaks almost eliminated, transmissions function again, power steering pumps work again, fuel injectors cleaned out to the point of several miles per gallon increases.




Sent from my LG-LS997 using Tapatalk
 

TyphoonFiST

4000 Post Club
Messages
4,559
Likes
1,355
Location
Rich-fizzield
#15
I've seen some impressive stuff. I've seen engine oil consumption massively reduced, oil leaks almost eliminated, transmissions function again, power steering pumps work again, fuel injectors cleaned out to the point of several miles per gallon increases.




Sent from my LG-LS997 using Tapatalk
I will agree 100% with this statement....There are some that work and some that don't.


Sent from my SM-N950U1 using Tapatalk
 

Ford ST

Senior Member
Messages
934
Likes
491
Location
Pleasant Garden
#16
I will agree 100% with this statement....There are some that work and some that don't.


Sent from my SM-N950U1 using Tapatalk
I worked in a shop where this old woman brought in a Chevy cavalier it had 50,000 miles on it the engine was completely locked up. The owner of the shop bought the car and decided to take the valve cover off he poured a bottle of seafoam on it before he left. The next morning we were able to turn over the engine. The engine was just full of varnish and gunk seafoam cleaned it out.

Sent from my LG-LS997 using Tapatalk
 

Krug

Active member
Messages
575
Likes
286
Location
Pontiac, MI
#17
I've seen some impressive stuff. I've seen engine oil consumption massively reduced, oil leaks almost eliminated, transmissions function again, power steering pumps work again, fuel injectors cleaned out to the point of several miles per gallon increases.




Sent from my LG-LS997 using Tapatalk
I don't consider cleaners to be additives, so I guess I should mention that. On that note, I've had great success with injector cleaners and pouring seafoam into the crankcases of higher-mileage engines a while prior to an oil change - for example, on a 1947 MG TC where a seafoam treatment helped reduce valvetrain noise by freeing up a sticky lifter, and also smoothed out the idle.

As with everything, there are caveats and exceptions. I'm a fan of simple solutions for simple purposes, but I never trust anything billing itself as a panacea and the evidence usually backs me up on that. 95% of the stuff you find on shelves will do nothing but lighten your wallet, at best. And at worst, eugh.
 

TyphoonFiST

4000 Post Club
Messages
4,559
Likes
1,355
Location
Rich-fizzield
#18
I don't consider cleaners to be additives, so I guess I should mention that. On that note, I've had great success with injector cleaners and pouring seafoam to the crankcases of higher-mileage engines a while prior to an oil change - for example, on a 1947 MG TC where a seafoam treatment helped reduce valvetrain noise by freeing up a sticky lifter, and also smoothed out the idle.

As with everything, there are caveats and exceptions. I'm a fan of simple solutions for simple purposes, but I never trust anything billing itself as a panacea and the evidence usually backs me up on that. 95% of the stuff you find on shelves will do nothing but lighten your wallet, at best. And at worst, eugh.
But what do you do with a cleaner? You essentially ADD it to another product or device....Hence the word additive...


Sent from my SM-N950U1 using Tapatalk
 

Krug

Active member
Messages
575
Likes
286
Location
Pontiac, MI
#19
But what do you do with a cleaner? You essentially ADD it to another product or device....Hence the word additive...


Sent from my SM-N950U1 using Tapatalk
Yeah and you ADD fuel to your gastank, but it is not considered an additive, now is it? I also ADD my foot to my throttle, but I don't call it a pedal additive. ;)

An additive is something meant to improve the quality of what you're mixing it into, typically a fluid like your oil or gas. Things like "friction reducers" and "octane boosters." A cleaner is a detergent, typically just using that fluid as a medium to perform its intended purpose of breaking up and removing sludge and buildup. Cleaners are not billed as, sold as, or intended to be used in the way that additives are. That is the way I make the distinction.
 

TyphoonFiST

4000 Post Club
Messages
4,559
Likes
1,355
Location
Rich-fizzield
#20
Yeah and you ADD fuel to your gastank, but it is not an additive, now is it? I also ADD my foot to my throttle, but I don't call it a pedal additive. ;)

An additive is something meant to improve the quality of what you're adding it to, typically a fluid like your oil or gas. Things like "friction reducers" and "octane boosters." A cleaner is a detergent, typically just using that fluid as a medium to perform its intended purpose of breaking up and removing sludge and buildup. Cleaners are not billed as, sold as, or intended to be used in the way that additives are. That is the way I make the distinction.
Yes ...its an additive to given the engine the ability to generate power into motion to make the vehicle. You Add your foot into the Throttle to give the car feedback to get it to move....Pretty much everything you do...your adding to something ....hence being an additive yourself.


Sent from my SM-N950U1 using Tapatalk
 


Top