Mustang and Ford Performance Forums banner
1 - 14 of 14 Posts

·
Registered
Joined
·
80 Posts
Discussion Starter · #1 ·
Does anyone know where to buy this plugs. At their website they are asking $11.95 per plug. Is this the normal price? Ill like to think that I could get them for less somewhere else. thanks.
 

·
Registered
Joined
·
309 Posts
RDSZ,
If you are going to run them with the KB and high boost, you should consider getting a colder plug. Something like the IT22 or IT24. In the Denso line, the higher the number the colder the plug. IT20 is really for something with stock boost or slightly higher.
 

·
Registered
Joined
·
80 Posts
Discussion Starter · #4 ·
lguerra1 said:
RDSZ,
If you are going to run them with the KB and high boost, you should consider getting a colder plug. Something like the IT22 or IT24. In the Denso line, the higher the number the colder the plug. IT20 is really for something with stock boost or slightly higher.
Thank; wich one would you recomend.
 

·
Snake Charmer
Joined
·
2,830 Posts
Some stock cobras came with agfs22's and some with agsf12's, when I called for a plug number ford recomended 12's which if im not mistaken would be about same heat range as the denso 20's. My car had 22's in it from factory which I think are about the same as the denso 16's.

Denso recommends one step colder for each 75-100hp over stock you go but since ford had 2 temp ranges this subject is about as clear as mud. Since ford now recommends the colder agsf12 plug, if we use that for a temp range and follow denso's recomendations from there it would look like this. For simplicity sake lets say a stock cobra has 375rwhp, that would mean goto 22's at 450-475, and 24's at 525-550+
 

·
Registered
Joined
·
309 Posts
Most people with your boost would run the IT22's. However, being that you are in Cali with their Communist octane ratings, you might consider the IT24's to help with detonation. The only issue with the IT24's is that it will have a tendency to foul the plug faster. I would start with the IT24's and go from there.
 

·
Snake Charmer
Joined
·
2,830 Posts
I actually ran 24's in my car for a couple weeks at 9psi and didnt have any fouling....to my surprise. Car was kind of bucking though which I later found out(later as in after I changed back to autocraft plugs) was due to a bad upstream O2 and exhaust leak. So he may be ok with 24's, but its hard to say. Plugs and gaping seem to be more of an art form than science. Im running motocraft agsf12's gapped at .034 and KB at 17psi and it runs great. I have my IT24's sitting and am debating weather or not to put them in since I plan on going to 19 or 21psi.
 

·
The Ubiquitous Jimmy V.
Joined
·
3,323 Posts
I run the 20's gapped @38 with no Problems at 472rwhp and 13lbs boost..at peak boost is only 11 to 12 lbs anyway..My car came with the 32's

Ford Specs on 03 Cobra:
Engine Ignition
Ignition timing 10 degrees BTDC ± 2 degrees non-adjustable
Firing order 1-3-7-2-6-5-4-8
Spark plug gap mm (in) 1.32-1.42 (0.052-0.056)
Spark plug type AWSF-32EE
 

·
Snake Charmer
Joined
·
2,830 Posts
Jim Vaccaro said:
I run the 20's gapped @38 with no Problems at 472rwhp and 13lbs boost..at peak boost is only 11 to 12 lbs anyway..My car came with the 32's

Ford Specs on 03 Cobra:
Engine Ignition
Ignition timing 10 degrees BTDC ± 2 degrees non-adjustable
Firing order 1-3-7-2-6-5-4-8
Spark plug gap mm (in) 1.32-1.42 (0.052-0.056)
Spark plug type AWSF-32EE
I just went to parts counter a few weeks ago and the guy looked it up, told me it showed the agsf12's....things that make you go hmmmm
 

·
The Ubiquitous Jimmy V.
Joined
·
3,323 Posts
Shadowgray03 said:
I just went to parts counter a few weeks ago and the guy looked it up, told me it showed the agsf12's....things that make you go hmmmm
I got 31 passes and 9k miles on my IT20's so i re ordered same Plug..
John Mihovetz recommended IT20 up to 12 lbs not many Eaton Blown Cobra are still getting 12lbs @ 6000+..from past 12 lbs to 16lbs he says 22's and after 16lbs 24's..My car idles mint so no use useing colder plug then needed IMHO..
 

·
Snake Charmer
Joined
·
2,830 Posts
Jim Vaccaro said:
I got 31 passes and 9k miles on my IT20's so i re ordered same Plug..
John Mihovetz recommended IT20 up to 12 lbs not many Eaton Blown Cobra are still getting 12lbs @ 6000+..from past 12 lbs to 16lbs he says 22's and after 16lbs 24's..My car idles mint so no use useing colder plug then needed IMHO..
My comments were more geared toward your info on the ford specs for the cobra than your specific choice in plugs, sorry for the misunderstanding.

Spark plug gap mm (in) 1.32-1.42 (0.052-0.056)
Spark plug type AWSF-32EE
Seems like an awefully large gap for a blown engine as well.
 

·
The Ubiquitous Jimmy V.
Joined
·
3,323 Posts
Shadowgray03

I read fast and just wanted to post my reason for useing the IT20..

I see most these KB blown cars with 17,18,19 lbs running 22's also..Ford to my knowledge used atleast 3 different heat ranges and settled in the Middle with the 22's for there later Production cars..
 
1 - 14 of 14 Posts
Top