Octane for max performance

Welcome to the busiest full-spectrum Lincoln community online!

Please join us! We'd really love to have you as a member...

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
OK this is a spin off of a previous post by me, and I know the 400hp is rated with 93 octane, but being the cheap a$$ that I am, does anyone really know if you lose hp with 91 Oct?

Thank you
 

silverydragon72

Well-known member
Jun 25, 2021
740
302
63
San Jose, CA
OK this is a spin off of a previous post by me, and I know the 400hp is rated with 93 octane, but being the cheap a$$ that I am, does anyone really know if you lose hp with 91 Oct?

Thank you
General guess is 10-15 hp but not positive. I run 91 as I am in California and 93 is a pain to get as you have to mix race fuel + 91 to get 93.
 

Action

Junior Member
Aug 12, 2005
1,976
997
113
Phoenix, AZ 85008-1418
Kind of depends on your driving.
If you hear no spark knock and do not go to WOT frequently or lots of high RPM there is not going to be much difference.
It is two points on the octane scale

Action
 

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
General guess is 10-15 hp but not positive. I run 91 as I am in California and 93 is a pain to get as you have to mix race fuel + 91 to get 93.
Thanks - 93 here in PA is significantly more than 91 so 10 hp loss I can deal with!
______________________________
 

bbf2530

Junior Member
Oct 12, 2011
4,818
2,792
113
OK this is a spin off of a previous post by me, and I know the 400hp is rated with 93 octane, but being the cheap a$$ that I am, does anyone really know if you lose hp with 91 Oct?

Thank you

Hi BC52. Yes, we do lose horsepower. But in the reality of day to day street driving, it doesn't matter.

The power difference between 93 premium and 87 regular will be ~25-30 hp, with the power losses from using 89 and 91 octanes obviously ranging as a lower percentage than that 25-30 hp metric. So yes, maybe a ~10 hp loss for 91 octane.
However, maximum output is only being produced and important when we are driving hard, "Pedal to the metal". So it does not make a darn bit of difference to the average driver if they are getting 370-375 hp instead of 400 in their daily drive, because they are never using anything close to that amount anyway.

Perhaps you would want to use premium fuel for full hp (and engine drive-ability), if you are racing your MKZ. Or towing on a hot summer day. But it is of no use to the majority of drivers in their day to day driving.

Save your money if you want and good luck.
 
Last edited:

silverydragon72

Well-known member
Jun 25, 2021
740
302
63
San Jose, CA
As an FYI adding a CAI will probably counter the HP difference by a bit as both the MKZ and Conti are very strangled by their stock air intakes.
 

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
As an FYI adding a CAI will probably counter the HP difference by a bit as both the MKZ and Conti are very strangled by their stock air intakes.
I'm curious if you had a recommendation on an aftermarket CAI as I like to think about possibilities :)
 

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
Hi BC52. Yes, we do lose horsepower. But in the reality of day to day street driving, it doesn't matter.

The power difference between 93 premium and 87 regular will be ~25-30 hp, with the power losses from using 89 and 91 octanes obviously ranging as a lower percentage than that 25-30 hp metric. So yes, maybe a ~10 hp loss for 91 octane.
However, maximum output is only being produced and important when we are driving hard, "Pedal to the metal". So it does not make a darn bit of difference to the average driver if they are getting 370-375 hp instead of 400 in their daily drive, because they are never using any;thing close to that amount anyway. a

Perhaps you would want to use premium fuel for full hp (and engine drive-ability), if you are racing your MKZ. Or towing on a hot summer day. But it is of no use to the majority of drivers in teir day to day driving.

Save your money if you want and good luck.
Well being in my 50s sometimes I enjoy reliving my youth :) but yeah not much room for opening it up where I live, but I can go places too lol
______________________________
 

silverydragon72

Well-known member
Jun 25, 2021
740
302
63
San Jose, CA
I have some fairly extensive mods on mine. attached is a picture of one I bought and modified to make the hood strut fit. It also requires you to move the battery back and have a smaller footprint battery so I basically had to replace my stock one with a stronger but more compact unit.

 

Attachments

  • cai.JPG
    cai.JPG
    202 KB · Views: 7

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
Did you do a YouTube vid by chance? I loved it
 

tgara

Well-known member
Aug 31, 2021
577
364
63
Connecticut
My Lincoln
2021 Nautilus

Action

Junior Member
Aug 12, 2005
1,976
997
113
Phoenix, AZ 85008-1418
Come race with me!!!!

Time to break out the high compression engines

Action
 

tgara

Well-known member
Aug 31, 2021
577
364
63
Connecticut
My Lincoln
2021 Nautilus
I love the smell of burning rubber in the morning….. :p:p:p
 

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
You know it! Me too! I didn't know it was possible until I deactivated DCT!
______________________________
 

BC52

Active member
Jul 1, 2022
253
39
28
My Lincoln
2017 MKZ 3.0t Black Label
So, I did my first dose of 93 and it def does feel a bit snappier - I guess I haven't owned it long enough, but with the 87 and some Lucas fuel treatment I use to keep the lines clean, there didn't seem to be much loss - idk
 
Top