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Old 01-21-2013, 08:58 PM   #1
Can't_C_Me
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Autolite plug review for FI (better than NGK)

As Alex and Chris know since we talk everyday. I have been trying these Autolite XP Iridium plugs since end of October and they are way more superior to the more expensive NGK LTR7IX-11 we have been using. I had fouled my 2nd set of NGK plugs and had to wait for 7 days to get them. I started researching for a set of plugs that could be found locally and found these. I have read many reviews on the plugs everywhere and was convinced to try them and costing $5.99-$6.99 was tempting. Also being a NASCAR used plug helped also. I have ran the plugs for 3 mi ths bow and they look like new almost. The NGK were filthy after just a week. Both plugs were ran hard on the same gapping and the conditions were also as I drive my car on 50+ weather mainly. The car also just like said by others runs smoother and fire off very well compared to the NGK. The 3 pictures below are as followed. #1 NGK after a week of use. #2 of the Autolite after 3 months of use. #3 what the plugs look like packaged.

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Old 01-21-2013, 09:04 PM   #2
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Just put tr6ix in my car yesterday. (ngk) Stock plugs looked nice but only had 1500mi on them. The auto parts store tried to sell me that auto-lite crap. If what you are saying is true auto lite has come along way.
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Old 01-21-2013, 09:10 PM   #3
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Thanks for the heads up I guess when it time to swap the ngk I will give them a try. What gap are you using.


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Old 01-21-2013, 09:14 PM   #4
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I'm running the same NGKs and mine don't look anything like that ? That's quite the difference. Were the autolite plugs one step cooler like the NGKs ?
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Old 01-21-2013, 09:26 PM   #5
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Quote:
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Thanks for the heads up I guess when it time to swap the ngk I will give them a try. What gap are you using.


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I am using 38
Quote:
Originally Posted by 2ssx2 View Post
Just put tr6ix in my car yesterday. (ngk) Stock plugs looked nice but only had 1500mi on them. The auto parts store tried to sell me that auto-lite crap. If what you are saying is true auto lite has come along way.
I said the same thing but I trusted the reviews as trucks and car owners were give great reviews.
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I'm running the same NGKs and mine don't look anything like that ? That's quite the difference. Were the autolite plugs one step cooler like the NGKs ?
The NGK and Autolite are equal. I am running rich when under WOT so mine may look more dirty than others. So if I see this much of a difference under the same conditions I bet others will see even better results.

I did this as the NGK we use have to be shipped to us causing a wait time. I use to get mine from my Summit racing store and still have to be shipped as these are special orders. Just trying to give the FI community another option at a lower cost. If anyone that tries them gets different results I would love to read it.
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Old 01-22-2013, 04:51 PM   #6
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IPF is recommending the NGKs also, or Denso 5340 ITV22, both are 1 step cooler than stock and both need a 0.031 (.8mm) gap with their S/C kit.

These Autolites look identical in design to the Denso's (which go for about $10ea).
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Old 01-22-2013, 05:32 PM   #7
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We just started using them as well! Good thread Cisco!
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Old 01-22-2013, 05:34 PM   #8
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This is good and usefull to know. thanks I guess its time to change tem out.
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Old 01-22-2013, 07:31 PM   #9
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Updated Plugs do anything for NA with our little v6's?

Keep it stock or is there something better we can use ?
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Old 01-22-2013, 07:36 PM   #10
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Quote:
Originally Posted by KalCorp View Post
Updated Plugs do anything for NA with our little v6's?

Keep it stock or is there something better we can use ?
Good question.

John B.
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Old 01-22-2013, 08:07 PM   #11
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Great review Cisco, hey man newb question, buts lets say your not FI, just bolt on and drive your car hard, would I see an advantage to switching over to these? and with the gap your using? Or is just beneficial to FI cars?
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Old 01-22-2013, 09:24 PM   #12
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Great review Cisco, hey man newb question, buts lets say your not FI, just bolt on and drive your car hard, would I see an advantage to switching over to these? and with the gap your using? Or is just beneficial to FI cars?
Only use colder plugs if the combustion temps will be "hotter" as in under boost or extremely high compression. Unless your increasing the power by let's say 100hp on a NA engine there's no benefit. Actually the plugs would foul quicker.


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Old 01-22-2013, 11:00 PM   #13
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What is your opinion (all) on the same plugs in the stock heat range, if they are even available?

That's how I should have asked the question.

John B.
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Old 01-22-2013, 11:54 PM   #14
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What is your opinion (all) on the same plugs in the stock heat range, if they are even available?

That's how I should have asked the question.

John B.
I've always hear that the OEM plugs GM put in are pretty solid. When it comes down to stock engines or normal bolt on NA builds in these Camaro's. I guarantee there is a better plug than the OEM out there. Always is something better and it doesn't always have to cost more also.

This is a post I found with some good info it's 3 years old so pricing may have changed lol.

Quote:

I'm a racing engine builder, working with many race teams and building everything from street performane engines to 1500+ HP achol. drag car engines, to hobby stock dirt track, etc.

For my customers and my own engines I search for every last 0.01 HP gain and on that quest for power I have dyno and track tested every plug known to man.

All the fancy trick plugs out there has shown to be nothing more than a gimmick. In fact in my testing I lost power in every engine tested with those trick plugs.

I found the AC Delco, Auto lite, Auto lite AR racing plugs, and NGK V power plugs to make the best power time after time.

I only use those above plugs in my own engines and my customer's engines

Spark plugs are pretty simple if you look at the way it works. The spark looks fo the path with least amount of resistance and if you start putting 3, 4, 6 ground straps in way of that spark, all that happens is the plug arc the spark off to the closest metal item which is the threads in the head will plug screws in.

The abov plugs range aout $1.25 to 4.00 a plug (the $4.00 a plug is the auto lite race plug and only used in engies with heavy nitrous, very high compression like 13:1, or alot of boost)
So unless we are running our engines inexcess of what it was build to perform at save your money and stick to the normal plugs.
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Old 01-23-2013, 12:43 AM   #15
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Hey Cisco thanks for the info man!
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Old 01-23-2013, 08:42 AM   #16
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Great write up and info. Never heard anything to lead me to believe autolite was making a good plug. This is why I keep coming back !
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Old 01-23-2013, 09:50 AM   #17
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Quote:
Originally Posted by JohnnyBfromPeoria View Post
What is your opinion (all) on the same plugs in the stock heat range, if they are even available?

That's how I should have asked the question.

John B.
IMHO, I've always had great performance from NGK's- but I don't think they make an equivalent to our stock plug.

Denso makes a performance plug that is- ITV20 5339. They recommend change intervals at 30K miles despite it being iridium, I guess cause it is so "high-perf".

I've been running them about 3mos. with good results, but haven't done any back to back testing. The stock ACDelco's are a solid plug.
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Old 01-23-2013, 10:42 AM   #18
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We've used the autolites and NGK iridium here. I don't think you'll see much difference from one type to the other but the iridium plugs in general seem to run much better especially while the engine is cold. We've used Denso too and they seem also a little more crisp than a normal copper plug. We try to sell people the iridium plugs when we know they are not going to change the coppers out every 15-20k. The iridium should last a easy 30k miles.

I will say you might want to double check your tune. No matter how good the plug is it shouldn't be that dark on the base. That is a pretty good indication of too much fuel at idle and low load areas.

Here is a good spark plug write up we did a while back.

http://www.pcmofnc.com/index.php?opt...ning&Itemid=56
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Old 01-23-2013, 10:42 AM   #19
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Interesting. Ill give those plugs a try next time. I do find it interesting that ipf suggested gap is .031 and RX is like .036-.038. I think mine are .037 I wonder if closing the gap would improve performance. However as far as I can tell, I am not having spark blow out.

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Old 01-23-2013, 12:38 PM   #20
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Interesting. Ill give those plugs a try next time. I do find it interesting that ipf suggested gap is .031 and RX is like .036-.038. I think mine are .037 I wonder if closing the gap would improve performance. However as far as I can tell, I am not having spark blow out.

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I been telling you and Alex about this plugs for months. Stay off the bottle lol.

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Old 01-23-2013, 12:39 PM   #21
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Quote:
Originally Posted by Alvin@PCMofNC View Post
We've used the autolites and NGK iridium here. I don't think you'll see much difference from one type to the other but the iridium plugs in general seem to run much better especially while the engine is cold. We've used Denso too and they seem also a little more crisp than a normal copper plug. We try to sell people the iridium plugs when we know they are not going to change the coppers out every 15-20k. The iridium should last a easy 30k miles.

I will say you might want to double check your tune. No matter how good the plug is it shouldn't be that dark on the base. That is a pretty good indication of too much fuel at idle and low load areas.

Here is a good spark plug write up we did a while back.

http://www.pcmofnc.com/index.php?opt...ning&Itemid=56
Awesome write up thanks for sharing.

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Old 01-23-2013, 01:49 PM   #22
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So when does blowout occur?
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Old 01-23-2013, 02:43 PM   #23
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I been telling you and Alex about this plugs for months. Stay off the bottle lol.

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I know that, but I never saw pictures. Not that I remember anyway.

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Old 01-23-2013, 03:56 PM   #24
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Thanks for the info. Will check out those Autolites!!!

Hey we have the same name???? I was confused a bit there.
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Old 01-23-2013, 03:59 PM   #25
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What is the autolite part number for these plugs??
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