• 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!


Fiesta ST Spark plug tech

Messages
52
Likes
2
Location
PARK CITY
#21
So whats the benefit of going to a colder plug? And if i read correctly, you want them indexed towards the exhaust port, is that right?
 


Colin1337

1000 Post Club
Messages
1,488
Likes
61
Location
Kirtland AFB
#22
Colder plug does just what it sounds like, burns a little colder. Allows you to run a bit more timing. Thats the short version lol
 


Hijinx

3000 Post Club
U.S. Air Force Veteran
Messages
3,290
Likes
1,669
Location
Auburn, AL, USA
#24
So, I can't seem to find the correct OEM gap information... Anyone? If RTFM, sue me.
 


Messages
180
Likes
26
Location
Phoenix
#25
So, two questions then.

First, regarding the "electrode modding," if this is a superior configuration with no downsides, why are spark plugs designed like this from the OEM?

Second, why does Ford specify the range of plug that they do? Just for longevity reasons? I know that there are always tradeoffs with OEM configurations, but Ford engineers know more than we do. Any thoughts?
 


Hijinx

3000 Post Club
U.S. Air Force Veteran
Messages
3,290
Likes
1,669
Location
Auburn, AL, USA
#26
So, two questions then.

First, regarding the "electrode modding," if this is a superior configuration with no downsides, why are spark plugs designed like this from the OEM?

Second, why does Ford specify the range of plug that they do? Just for longevity reasons? I know that there are always tradeoffs with OEM configurations, but Ford engineers know more than we do. Any thoughts?
In short, emissions.
 


Messages
48
Likes
0
Location
Stewartsville
#27
would running a step colder on a stock motor help anything or is it really a help when you start tuning it?
 


JPGC

2000 Post Club
Messages
2,011
Likes
214
Location
Middleburg
#28
I run 1 step colder plugs with my Setup and the Freektune. It did seem to idle a little better but that may just be placebo on my part. My plan is to one day do a back to back datalog with both sets of plugs to see if I can detect any difference in the two sets. They are really easy to change on this car, btw.
 


JPGC

2000 Post Club
Messages
2,011
Likes
214
Location
Middleburg
#33
I don't know what is professionally recommended by the expert tuners but I gapped mine at .030, which was what my stockers were at when I pulled them. I've seen on different forums where people recommended from .026 to .032 with these plugs on the FIST, FOST, and MS3.
 


airjor13

2000 Post Club
Messages
2,751
Likes
426
Location
Centreville
#34
I don't know what is professionally recommended by the expert tuners but I gapped mine at .030, which was what my stockers were at when I pulled them. I've seen on different forums where people recommended from .026 to .032 with these plugs on the FIST, FOST, and MS3.
Okay I gaped mine at .030. So far the butt dyno feels like the idle is smoother :)
 


Sourskittle

4000 Post Club
Messages
4,567
Likes
861
Location
Lakeland
#35
Anyone find a normal NGK copper plug that is 1 or 2 ranges colder? I don't want the plutonium supercharger platinum unobtainium plugs, just a normal ngk copper plug.
 


RAAMaudio

5000 Post Club
Messages
5,268
Likes
925
Location
Carson City
#36
I have four NGK LTR7IX-11 plugs in my car, three indexed really well but one is off a bit more than I would like.

I am considering buying more to find one to index right and then selling those that I do not need, they would be new except test fit and if one fits before I tested them all the rest would not be installed or even open the package.

The one that is off I would donate to the buyer, it has around 1200 miles on it, or donate to a pool if somebody wants to stock up on test fit plugs, lightly used, etc. and pass them around to help others do this:)

Let me know if interested and I will order asap and give a nice discount on what I do not need:)

Thanks:)
Rick
 


Sourskittle

4000 Post Club
Messages
4,567
Likes
861
Location
Lakeland
#37
I'm fine with buying the plugs, I just don't know which ones to get. The LTR7IX-11 is a iridium plug. I want straight up copper. Like the plugs that used to sell for 94cents but are now like $4.25.
 


RAAMaudio

5000 Post Club
Messages
5,268
Likes
925
Location
Carson City
#38
I used to swap out copper plugs all the time years ago, every race, new plugs, sold the barely used ones for half price.

I chose the Iridiums as just need the lower maintenance time on all things I can, why I have the best fluids, etc........
 


Similar threads



Top