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    1. · Registered
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      Welcome to the forum 888 and congrats on the new Cruze!



      J is absolutely right with one exception. While we were talking I forgot to mention that the one area the 8's have an advantage over the 7's is smoothness under load at VERY low RPM, like below 900 RPM. Above 1000 RPM they both work much better than the OE Iridium plugs, but if you lug the engine down to the lowest of RPM the 8's are a bit smoother. Even with the Eco`s extra tall 6th gear I can lug it down to 26-27 MPH before it protests enough to warrant a downshift. I would get about 29-30 MPH out of the 7`s, and the OE Iridiums (even gapped properly) needed to be shifted before about 33-34 MPH. With the stock plugs I was convinced the cam timing changed below 1100 RPM and the engine just wouldn't make any torque that low. A plug upgrade showed me otherwise.

      The real impressive difference is how much easier it is to get the car off the line. With either plug you can walk the car from a dead stop with very little throttle, where the stock plugs require much more throttle and higher RPM to get the same response.

      I'd be interested in an update from prince_bigd as he's an aggressive driver and is also using the BKR8EIX. A colder plug will foul easier under load and he's one of our test rats. If his plugs are still going strong I'd recommend them. I'm an easy driver and much less likely to foul plugs.

      Welcome to the club!
      Thanks for the reply. I ordered a set of the BKR8EIX plugs off of Amazon this morning.

      Amazon.com: 4 New NGK Iridium IX Spark plug BKR8EIX # 2668: Automotive

      $28 doesn't seem like much of an investment if it helps the car drive better how I drive it, which is about like you drive it. I'm not in a big hurry to get anywhere and if a car seems quick and responsive when I want it to be, that's fine by me. I'm not a 9/10 type of driver. This is my first new car in 11 years and I'm not inclined to beat on it.

      I assume the car will have a learning period after the plug change when the ECU responds and adjusts everything? How long does that take?

      I had an early S-10 that ran great every time I would adjust the timing but went back to running like crap in a few miles as the ECU took over and made it stupid again. I eventually found a TSB on the web for an ECU issue, back then you could swap the EEPROM chips and after I did that, it was a lot better. As good as a base model S-10 could be, anyway.
       
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    2. · Premium Member
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      Are there any updates about the BKR8EIX iridium plugs that Blue Angel and a few others had tried? Initial results seemed to be as good if not better than the BKR7E coppers, but I haven't really heard much since. A longer lasting iridium that yields the same (or better) performance sounds like a more ideal solution IMO, but its odd that I haven't heard more than a couple mentions about the BKR8EIX iridiums here or there in comparison to the BKR7E coppers.
      My BKR8EIX are still in the car and working great, from the cold of winter to the heat and humidity of summer. However, I am a very easy driver which tends to keep plugs hot and clean. We had a member who was an aggressive driver with an aftermarket tune try the BKR8EIX. He found that, under his type of driving (aggressive acceleration and lots of mountain pass climbs) he had them foul.

      I haven't heard any more long-term feedback on them from any other members. So all we know so far is, if you drive easy on a stock tuned car they seem to work great, and if you drive the heck out of your car on an aftermarket tune you may foul them. Two completely opposite ends of the spectrum.

      If I have a chance this weekend I'll pull them and have a look at the gaps. I don't imagine they've grown much, but these plugs don't have the platinum pads in the ground electrodes like the OE plugs do, so compared to the OE plug their service life will be shorter (and/or require more frequent gapping), but compared to the BKR7E they should last much longer (and require less frequent gapping).

      It's too bad they cost 4X what the BKR7E plugs do.

      Ha! Someone is selling sets of four BKR8EIX on Amazon for $28.72 with free shipping:

      http://www.amazon.com/NGK-Iridium-S...e=UTF8&qid=1408072567&sr=1-2&keywords=BKR8EIX

      That's only $7.18/ea, I think I paid closer to $10/ea.

      Still a lot more than the BKR7E:

      Amazon.com: NGK (4644) BKR7E Standard Spark Plug, Pack of 1: Automotive
       
    3. · Administrator, Resident Tater Salad
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      Discussion Starter · #1,259 ·
      Can someone link the plugs this thread is suggesting to use? See a couple listed in here and want to make sure I order the right ones for my 2012. I have horrible hesitation in 3rd gear with or without AC (worse with ac) but if I take off from a rolling stop or turning a corner and it’s goes down into 3rd it just will...not...go... it’s sooooo slow and like 0 torque. Always in the same exacts scenario
      Iridium:

      Nickel (short life, best performance):
       
    4. · Registered
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      34 Posts
      Iridium:

      Nickel (short life, best performance):
      Recommended gap? Do you run the nickels?
       
    1. · Registered
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      Discussion Starter · #28 ·
      Checking the gap on the plugs would be advisable. Since you drive so little, you could also throw in a set of BKR7E-4644 plugs as advised in the thread referenced above if you are still experiencing sluggish acceleration or hesitation...they would just about last you another couple years without even messing with them. My 2012's gaps were all over the place from the factory and the darn thing was almost undrivable in the summer from a dead stop. I managed to stall it a few times so much power was pulled and it looked like I couldn't drive a manual.
      These are copper ones that last 5000-7000 miles? Like: https://www.amazon.com/NGK-4644-4PK-BKR7E-Standard-Spark ?

      If possible I would prefer something that last longer so I don't need to change them as often. Would these work longer: https://www.amazon.com/NGK-Iridium-Spark-BKR8EIX-2668/dp/B00332810I and would you recommend them?

      Also, I've tried today to get spark plugs out for inspection with my 5/8 Stanley's spark plug socket, but for some reason socket won't fit on spark plug. Will figure it out I guess.
       
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      These are copper ones that last 5000-7000 miles? Like: https://www.amazon.com/NGK-4644-4PK-BKR7E-Standard-Spark ?

      If possible I would prefer something that last longer so I don't need to change them as often. Would these work longer: https://www.amazon.com/NGK-Iridium-Spark-BKR8EIX-2668/dp/B00332810I and would you recommend them?

      Also, I've tried today to get spark plugs out for inspection with my 5/8 Stanley's spark plug socket, but for some reason socket won't fit on spark plug. Will figure it out I guess.
      They last longer than that, you just have to regap them 2 or 3 times in their lifetime at those miles. the 2nd set is what I used after growing tired of regapping the 1st set every 3 months.
       
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      Discussion Starter · #4 ·
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    3. · Administrator, Resident Tater Salad
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      These the right ones? https://www.amazon.com/NGK-Iridium-Spark-BKR8EIX-2668/dp/B00332810I I know jblackburn had some issues with the Iridium, I'm wondering if anyone else has had similar issues.
      I'd be careful with the 8 heat range, I had driveability problems with mine when I tried them, and they're recommended for performance tunes but not stock ones.

      The stock "Delco" (41-121) plugs are rebranded BR7EIX and they're less expensive too. https://www.rockauto.com/en/catalog...turbocharged,1501801,ignition,spark+plug,7212
       
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