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Old 03-09-2013, 08:27 AM   #11
roughrider3211
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I am running a .047 gap on ar 103

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Old 03-09-2013, 08:13 PM   #12
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At the risk of this coming off the wrong way, why did Ford not equip the car with 103s at those specs from the factory if it got better MPGs and more power? I'm not stating it to be argumentative, but I figure that if it meant bigger numbers for power and MPG on the window sticker they would have done it, not like it is a cost/comfort issue like a cold air box or performance exhaust system.

Life is the only thing I can think of, but based on the sparkplug thread here people get 30,000 (at the factory gap of .050), which is about average for copper plugs in the American engines I've dealt with, and it isn't that they are a pain to change. Platinum would seem to be the ideal compromise then from a factory standpoint; good life and while not as good performance wise as the plain copper, still better than the higher heat range. That's my hang up in switching mine over to 103s; if they worked better why weren't they put on from the factory? Trust me, I want them to be better... I am not fond of the way these cars idle and a little MPG boost always helps when you put 360 miles a week on your car.

By the way, what type of fuel are you guys using when getting these gains? Regular or 93, 100% gas or 10% ethanol crap? Any performance ad ons?
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Old 03-09-2013, 09:03 PM   #13
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There is no good to reason to run copper plugs in N/A non-racing apps. Platinum and Iridium plugs are found in OE apps that push 500+ HP and this does not significantly reduce power or economy. It's just silly unless you're flogging your car mercilessly for hours at a time in a controlled off-road environment (or you're racing on the street which is very stupid). For example, copper plugs do have some merit if you're runing track days at wot for 30 minute sessions. This sort of sustained WOT severe duty use in N/A cars can cause welds on iridium or platinum pucks to fail, causing them to drop into the combustion chamber. The same problem can plague forced induction cars with marginal tune in street environments. This can lead to cylinder scoring. Street cars with bad tuning (too lean or too much advance) can drop electrodes or pucks into the cylinder but it's more prevalent when driven illegally (risking the general public). In my opinion, the proper fix is not copper plugs. Loss of license or proper tuning would eliminate the issue.

The copper plug fad for N/A street apps was spawned from ill-advised folks who believe that racing or forced induction tricks are always a good idea on pedestrian street cars. Many of the same folks are running non-approved racing lubes in their cars which can lead to premature wearout or failure.
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Old 03-10-2013, 04:56 AM   #14
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It was worth the swap for me for the smoother idle,the mpg and couple extra horsepower were just added bonuses.
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Old 03-10-2013, 03:08 PM   #15
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I dont know bout horse power but i have smoother idle after doing the swap over. Also on my fofo i am running 93 octane with a tune. When dataloging i noticed my air fuel leaned out a bit more in higher rpm which i was looking for because i was at 11.8 af @ 5900, with ar103 @ .047 gap im now 11.4 @ 5900. It really depends on what your looking for. Ar103 dont last as long as motorcraft platinum. In my OPINION its worth it.

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Old 03-10-2013, 05:15 PM   #16
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Quote:
Originally Posted by roughrider3211 View Post
I dont know bout horse power but i have smoother idle after doing the swap over. Also on my fofo i am running 93 octane with a tune. When dataloging i noticed my air fuel leaned out a bit more in higher rpm which i was looking for because i was at 11.8 af @ 5900, with ar103 @ .047 gap im now 11.4 @ 5900. It really depends on what your looking for. Ar103 dont last as long as motorcraft platinum. In my OPINION its worth it.

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Thank you for real numbers and the efficient use of data logging. To many people say blah blah blah copper is no good. Here is proof they improved your cars motor.

In NO post, NO post does anyone mention better MPG's, so whoever is hung up on that, please put it to rest. The use of AR 103's is for a better idle and a couple HP gain. Thats it. I thought my car had a bad motor mount because the vibrations, I installed AR103's gapped at .050 and its very smooth, has been for 15K and since it cost me $12, they will be replaced with the next oil change.
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Old 03-10-2013, 05:50 PM   #17
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Quote:
Originally Posted by roughrider3211 View Post
I dont know bout horse power but i have smoother idle after doing the swap over. Also on my fofo i am running 93 octane with a tune. When dataloging i noticed my air fuel leaned out a bit more in higher rpm which i was looking for because i was at 11.8 af @ 5900, with ar103 @ .047 gap im now 11.4 @ 5900. It really depends on what your looking for. Ar103 dont last as long as motorcraft platinum. In my OPINION its worth it.

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You didn't lean it out.. Going from 11.8 down to 11.4 you actually richened the air fuel mixture.

I see about 11.8-12.0 WOT on my boosted 09
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Old 03-10-2013, 07:20 PM   #18
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For real because it seem like that would be the other way either way it gave me what i need when me and tom was looking at the parameters. And when i was running down at the track before winter, it seems i like it ran stronger in the higher rpm since the tune updatd and the ar103

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Old 03-10-2013, 07:31 PM   #19
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Yup for real..11.4 is actually fairly rich for a naturally aspirated tune at WOT. The further away you get from 14.7 (stoich) which is your idle/cruise air fuel ratio, the richer the mixture becomes.
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Old 03-10-2013, 10:06 PM   #20
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Quote:
Originally Posted by GreyScorpion View Post
Thank you for real numbers and the efficient use of data logging. To many people say blah blah blah copper is no good. Here is proof they improved your cars motor.

In NO post, NO post does anyone mention better MPG's, so whoever is hung up on that, please put it to rest. The use of AR 103's is for a better idle and a couple HP gain. Thats it. I thought my car had a bad motor mount because the vibrations, I installed AR103's gapped at .050 and its very smooth, has been for 15K and since it cost me $12, they will be replaced with the next oil change.
It's actually mentioned several times in this thread:

http://www.focusfanatics.com/forum/s...ght=spark+plug

Hence my interest. Another oddball thing I noticed; I used to run Denso Platinum Twin Tips in a 93 Corolla... great plugs but after the first 20k you needed to regap them. I noticed that their P/N for this car is equal to Autolite 105/106. Odd that it would sold as a direct replacement if it's equal to a different Autolite heat range; not going near those at any rate haven't heard any nice things about them in this car.
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