• Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific Tech

When to change octane if changing tune?

  • Thread starter Thread starter ecko51
  • Start date Start date Jul 29, 2006
E

ecko51

New Member
May 1, 2005
27
0
0
Jul 29, 2006
#1
  • Jul 29, 2006
  • #1
What is the proper way to go up or down in octane as far as fueling and when to change the tune?


Thanks, Mike
 

bigcat

start with the upper hole, and if more traction is
May 1, 2005
3,015
1
79
7200 feet
Jul 29, 2006
#2
  • Jul 29, 2006
  • #2
you want the tank as low as possible before filling up and changing the tune.
 

Saleen-wana-be

New Member
May 4, 2006
51
0
0
Jul 29, 2006
#3
  • Jul 29, 2006
  • #3
yeah, fill up then tune, never tune then fill. Although if your going down from like 91 to 87 it wont really matter, but when going up, run it almost to E, fill up then tune.
 
You must log in or register to reply here.

Similar threads

G
Octane on the 5.0 Coyote
  • gray owl
  • May 17, 2026
  • 2015 - 2023 (S550) Mustang -General/Talk
Replies
7
Views
502
2015 - 2023 (S550) Mustang -General/Talk May 27, 2026
Bullitt347
First Car, what should I do for power??
  • tunedV6
  • Apr 13, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
7
Views
442
1996 - 2004 SN95 Mustang -General/Talk- May 4, 2026
580HP*428Cj
5
J
Engine Stalling
  • josh40tay
  • Oct 20, 2026
  • Fox 5.0 Mustang Tech
Replies
4
Views
194
Fox 5.0 Mustang Tech Oct 21, 2026
JD1964
T
Fuel P0193 on a 2003 3.8 v6
  • Treemaster5000
  • Aug 18, 2026
  • SN95 V6 Mustang Tech
Replies
0
Views
117
SN95 V6 Mustang Tech Aug 18, 2026
Treemaster5000
T
M
Idle control problems
  • miser143
  • Aug 28, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
201
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 29, 2026
DadLife0724
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?