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Old 08-03-2010, 07:11 AM   #1
corvet786c
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Default What is the Best Spark Plugs for C6?

Is it NGk's like the LS1's or diffrent?
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Old 08-03-2010, 08:34 AM   #2
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Originally Posted by corvet786c View Post
Is it NGk's like the LS1's or diffrent?
i race so i read the plugs often, so i use tr55 and just change them since they are cheap
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Old 08-03-2010, 02:16 PM   #3
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Originally Posted by corvet786c View Post
Is it NGk's like the LS1's or diffrent?
If your car is lightly modded or mostly stock ,the Delco plugs are the best. I have seen so many driveability issues recently with NGK's installed in reletively stock cars. I have swapped out NGK's for delco plugs in over a dozen cars recently for random drivability issues directly related to the plugs. Everything from P0300 codes to carbon tracking on the plugs.

I did a back to back comparison on Delco plugs vs NGK's in our LS2 Trailblazer SS and we lost 8 RWHP with NGK's. I still run them in the TBSS because it has a 125 kit on it, but I would not touch them in a stock car. I am running the AC Delcos in our Cammed Z06 without issue.
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Old 08-03-2010, 02:55 PM   #4
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Originally Posted by RichieRichZ06 View Post
If your car is lightly modded or mostly stock ,the Delco plugs are the best. I have seen so many driveability issues recently with NGK's installed in reletively stock cars. I have swapped out NGK's for delco plugs in over a dozen cars recently for random drivability issues directly related to the plugs. Everything from P0300 codes to carbon tracking on the plugs.

I did a back to back comparison on Delco plugs vs NGK's in our LS2 Trailblazer SS and we lost 8 RWHP with NGK's. I still run them in the TBSS because it has a 125 kit on it, but I would not touch them in a stock car. I am running the AC Delcos in our Cammed Z06 without issue.
I have a real problem believing there is 8 RWHP difference when installing any plug with the right heat range. Let's see some dyno graphs. I would love this to be true...I certainely would like to see another 8 RWHP! Better than adding a Fast intake to my Bolt-on LS3.
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Old 08-03-2010, 03:11 PM   #5
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I have a real problem believing there is 8 RWHP difference when installing any plug with the right heat range. Let's see some dyno graphs. I would love this to be true...I certainely would like to see another 8 RWHP! Better than adding a Fast intake to my Bolt-on LS3.

Im not buying it either.
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Old 08-03-2010, 04:05 PM   #6
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Originally Posted by theofel View Post
I have a real problem believing there is 8 RWHP difference when installing any plug with the right heat range. Let's see some dyno graphs. I would love this to be true...I certainely would like to see another 8 RWHP! Better than adding a Fast intake to my Bolt-on LS3.
Here are the graphs. 1st run is baseline with stock plugs and no tune, 2nd is with long tubes, tune and NGK's, 3rd is back to Delco's with no other changes in the tune. I felt that after adding the LT's it should have picked up more so we were wondering why. We put the stock AC Delco plugs back in it to eliminate that variable and came up with an additional 8 RWHP.



Click the image to open in full size.
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Old 08-03-2010, 04:11 PM   #7
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Theres some other factor at work here. Dont know what it is but Im confident you're not getting 8hp with just a plug change, unless theres a gap difference, wrong heat range, bad plug or something not quite the same from test to test.
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Old 08-03-2010, 04:33 PM   #8
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Originally Posted by NYC6 View Post
Theres some other factor at work here. Dont know what it is but Im confident you're not getting 8hp with just a plug change, unless theres a gap difference, wrong heat range, bad plug or something not quite the same from test to test.

Gap was double checked, heat range was the same, part numbers for the application were verified etc. This is not my first BBQ

This is not the only time I have seen something similar. I work at a dealer and we see 30-40 forum cars a month, all with unique issues. Recently I have seen a ton of issues with aftermarket plugs and drivability issues. I only posted this for people to see facts, not some keyboard commando baised opinion with no supporting facts to back it up. Take it for what it's worth and if you don't believe it, no biggie. I am not going to lose any sleep over peoples doubts on this issue when I see it on a weekly basis.

Last edited by RichieRichZ06; 08-03-2010 at 04:39 PM.
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Old 08-03-2010, 04:42 PM   #9
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Originally Posted by RichieRichZ06 View Post
Here are the graphs. 1st run is baseline with stock plugs and no tune, 2nd is with long tubes, tune and NGK's, 3rd is back to Delco's with no other changes in the tune. I felt that after adding the LT's it should have picked up more so we were wondering why. We put the stock AC Delco plugs back in it to eliminate that variable and came up with an additional 8 RWHP.



Click the image to open in full size.
that plugs brand new out of the box, diferent brands could make a big diference, im not sure on the dyno numbers but i have seen .15 gain at the 1/4 and also a loss of .30 with less then a 100 street miles on some brandsi have never had a problem with the ngk, i always just coat the iner spark plug boots with a qtip and dielectric creme
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Old 08-03-2010, 05:24 PM   #10
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Originally Posted by dennis50nj View Post
that plugs brand new out of the box, diferent brands could make a big diference, im not sure on the dyno numbers but i have seen .15 gain at the 1/4 and also a loss of .30 with less then a 100 street miles on some brandsi have never had a problem with the ngk, i always just coat the iner spark plug boots with a qtip and dielectric creme
.15 gain or loss would account for about 8-10 HP, which would be consistant with what I found. Both of the sets of plugs were brand new and the gap was checked just to eliminate that variable.

The only reason that made me think to do this comparison was seeing so many recent issues with aftermarket plugs on Corvettes. Using that logic on the LS2 TBSS, this is what i found.

The dielectric grease is a good idea to keep the boots from sticking on the plugs as well.
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Old 08-03-2010, 07:26 PM   #11
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Quote:
Originally Posted by theofel View Post
I have a real problem believing there is 8 RWHP difference when installing any plug with the right heat range.
Quote:
Originally Posted by NYC6 View Post
Theres some other factor at work here. Dont know what it is but Im confident you're not getting 8hp with just a plug change, unless theres a gap difference, wrong heat range, bad plug or something not quite the same from test to test.
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Old 08-03-2010, 07:52 PM   #12
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In my opinion, the AC Delco plugs are just as good if not better than the other spark plugs on the market. I don't believe thereis anything to be gained by change them out to another brand including NGK for a stock or mildly modded engine.

Last edited by Mez; 08-04-2010 at 03:56 PM.
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Old 08-03-2010, 08:13 PM   #13
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Quote:
Originally Posted by RichieRichZ06 View Post
If your car is lightly modded or mostly stock ,the Delco plugs are the best. I have seen so many driveability issues recently with NGK's installed in reletively stock cars. I have swapped out NGK's for delco plugs in over a dozen cars recently for random drivability issues directly related to the plugs. Everything from P0300 codes to carbon tracking on the plugs.

I did a back to back comparison on Delco plugs vs NGK's in our LS2 Trailblazer SS and we lost 8 RWHP with NGK's. I still run them in the TBSS because it has a 125 kit on it, but I would not touch them in a stock car. I am running the AC Delcos in our Cammed Z06 without issue.
Are we talking about Delco's iridium plugs? How often should plug wires and plugs be changed for optimal performance on a stock LS3? I know the owners manual states 100k miles. Did the 08 LS3's come with Delco iridium plugs? Thanks for any response.

Last edited by Mike's LS3; 08-03-2010 at 08:24 PM.
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Old 08-03-2010, 08:24 PM   #14
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Are we talking about Delco's iridium plugs? How often should they be changed for keeping optimal performance on a stock LS3?
Yep, the stock Iridium plugs. I change mine every 10k miles, but that is excessive. We beat the **** out of our car every chance we get including Auto-X, HPDE's and drag racing so I like to keep them fresh.

Depending on driving habits, racing etc, I would change them every 25k on a mildly modded engine or less frequently on a stock one. I see cars come in here with 50k-75k on stock plugs and they still run great.
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Old 08-03-2010, 11:57 PM   #15
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Quote:
Originally Posted by Mike's LS3 View Post
Are we talking about Delco's iridium plugs?
Did the 08 LS3's come with Delco iridium plugs?
Quote:
Originally Posted by RichieRichZ06 View Post
Yep, the stock Iridium plugs.
The factory/stock Corvette AC Delco plugs are Iridium?
I thought they were Platinum but I guess not.
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Old 08-04-2010, 02:53 PM   #16
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Originally Posted by LS1LT1 View Post
The factory/stock Corvette AC Delco plugs are Iridium?
I thought they were Platinum but I guess not.
They have been Iridium for years.

Click the image to open in full size.
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Old 08-04-2010, 03:17 PM   #17
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If that dyno graph is from a LS3 with the mods you quoted...those #'s are about 60 t0 85 hp shy of what they should be! Even without mods they are 35 t0 50hp off. I'm willing to give the Delco another try when I change out my NGK tr55's. Thanks for your input.
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Old 08-04-2010, 03:36 PM   #18
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Originally Posted by theofel View Post
If that dyno graph is from a LS3 with the mods you quoted...those #'s are about 60 t0 85 hp shy of what they should be! Even without mods they are 35 t0 50hp off. I'm willing to give the Delco another try when I change out my NGK tr55's. Thanks for your input.
In the previous posts I stated the dyno graphs were from my LS2 Trailblazer SS with Long tubes and cold air.
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Old 08-04-2010, 05:47 PM   #19
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Brisk USA plugs work great for me.
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Old 10-05-2011, 06:33 PM   #20
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I just had longtubes and cam installed on my 08 C6. Would the delco's still be OK for this application?
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Old 10-05-2011, 06:33 PM
 
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