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2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

Needing new spark plugs

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Old 08-14-2015, 07:27 PM
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Needing new spark plugs
What would benefit me the most if I decide to switch over to premium fuel only.? Already need new spark plugs.
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Old 08-14-2015, 07:37 PM
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Needing new spark plugs
Stock
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Old 08-14-2015, 07:40 PM
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No benefits of going to premium fuel with N/A
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Old 08-14-2015, 07:40 PM
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Premium fuel will help clean your engine i believe. With a tune on 93 and a few bolt ons you could gain 20-30hp
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Old 08-14-2015, 07:49 PM
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Originally Posted by Slowbalt2000
Premium fuel will help clean your engine i believe. With a tune on 93 and a few bolt ons you could gain 20-30hp
What should I do if I decide to get the Stage 2 Hahn turbo kit down the road?
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Old 08-14-2015, 08:01 PM
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Once you get that turbo on then yeah use premium
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Old 08-14-2015, 08:39 PM
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Originally Posted by Snail_SS
Once you get that turbo on then yeah use premium
so right now that i have it stock i should just keep it with regular gasoline?
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Old 08-14-2015, 08:42 PM
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I would
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Old 08-19-2015, 06:31 AM
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Originally Posted by Snail_SS
No benefits of going to premium fuel with N/A
Umm bad advice here. 2.4 is designed to run on premium and will pull timing with regular until its no longer knocking. Sure it runs on regular, but you are down on power.
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Old 08-19-2015, 07:20 AM
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Originally Posted by mtbrent
Umm bad advice here. 2.4 is designed to run on premium and will pull timing with regular until its no longer knocking. Sure it runs on regular, but you are down on power.
Correct.

Stick with the stock plugs. They are good.
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Old 08-19-2015, 12:28 PM
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My bad then 2.4 is a totally different engine then
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Old 08-19-2015, 12:45 PM
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The 2.4 was considered a H.O. engine, and had the same instructions as a stock SS/SC in terms of fuel.
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Old 08-19-2015, 12:54 PM
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Originally Posted by Slowbalt2000
Premium fuel will help clean your engine i believe. With a tune on 93 and a few bolt ons you could gain 20-30hp
Premium doesn't clean your engine. It's all about that knock yo. As said before, if the ECU pulls timing then you're down on power.
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Old 08-20-2015, 03:25 PM
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Thanks everybody very useful info
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Old 08-24-2015, 02:10 AM
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Originally Posted by mtbrent
Umm bad advice here. 2.4 is designed to run on premium and will pull timing with regular until its no longer knocking. Sure it runs on regular, but you are down on power.
Originally Posted by Staged07SS
The 2.4 was considered a H.O. engine, and had the same instructions as a stock SS/SC in terms of fuel.
This is news to me as well. I've always ran mine on 87octane. Guess I'll start throwing 93 in her.
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Old 08-24-2015, 04:59 AM
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Originally Posted by exninja
Premium doesn't clean your engine. It's all about that knock yo. As said before, if the ECU pulls timing then you're down on power.
In a way I believe it does. Part of the reason it costs more is because of the detergents and lubricants they add to it.
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Old 08-24-2015, 09:33 AM
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Originally Posted by Slowbalt2000
In a way I believe it does. Part of the reason it costs more is because of the detergents and lubricants they add to it.
Not really, it all depends on the fuel carrier. Octane rating does not depict detergent ratings, whether or not the fuel carrier is apart of the Top Tier Program does though. The attachment is a bulletin from gm that has a list of Top Tier Stations as of July.
Document ID_ 4225054.pdf

*edit: Kinda hard to see the list, this link will take you straight to the toptier website which has
the list also. Top Tier Gasoline
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Old 08-24-2015, 01:05 PM
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That's good info, thanks for the list. I'll stick to those places from now on.
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