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False Knock or nah?
- Thread starter dyn085
- Start date
Thread Starter
#23
Generally speaking, most moderately boosted (no specific definition, but I classify it as 15-30 psi) cars run better in that general gap range. Higher boost cars (30+) use less gap while mildly boosted (<15) will run better with more. This is not meant to be 'definitive' information, just my general observations-there are lots of factors to consider.
I haven't gotten around to any general plug testing to have further data, but just like any other aspect of the engine-it's a tunable item. Because of the facts that I'm not trying to extract every possible extra hp and that plugs don't generally yield large gains, it hasn't been a pressing matter yet. Someday I'll get bored enough to do it, but with my datalogging road being so far away...
Tl;dr-For me it's just the most logical starting point. Ymmv.
I haven't gotten around to any general plug testing to have further data, but just like any other aspect of the engine-it's a tunable item. Because of the facts that I'm not trying to extract every possible extra hp and that plugs don't generally yield large gains, it hasn't been a pressing matter yet. Someday I'll get bored enough to do it, but with my datalogging road being so far away...
Tl;dr-For me it's just the most logical starting point. Ymmv.
Thread Starter
#25
That's not illogical at all, I just didn't want to get to the point during tuning where we raised boost just to find out that I would need to tighten the gap. I just went the route of possibly leaving a few hp on the table for the sake of consistency as opposed to the possibility of having to troubleshoot.
Jmo, but I would pull your plugs and swap their locations before ordering. If your problem follows the new locations then you have a definitive answer but if it's resolved then you saved a few bucks.
Jmo, but I would pull your plugs and swap their locations before ordering. If your problem follows the new locations then you have a definitive answer but if it's resolved then you saved a few bucks.
Ahh, that's a good idea! My new Motorcraft plugs are already on the way but I can put them in my stock parts bin (getting larger by the week) if the corrections don't move around. I can just make 2 and 3 become 1 and 4.
I half expect the issue to be intake oil coming in from the PCV system between the 2 and 3 runners...
I half expect the issue to be intake oil coming in from the PCV system between the 2 and 3 runners...
Thread Starter
#30
I don't have an OCC either, and I don't intend on it. Outside of restoring your octane, which is a null-point on a daily driver that is custom tuned, I just don't see the added cost/time as being beneficial. Obviously that's a completely different subject covered elsewhere, and there's really no 'wrong' decision in having or not having one.
I guess my point with this and related threads is that, especially for AP3 users, addressing possible issues is less-difficult than it looks or sounds most of the time. I don't claim to know everything and can't look at a single log and come to a legitimate/correct answer, but anyone can rule out possibilities one step/test at a time and should be able to reach resolution. Sometimes it's a bit time-consuming and each fault may require a different overall approach, but it gets easier the more you look at and analyze your data. A lot of times in aviation that is the only way to correctly diagnose a fault that isn't directly covered in manuals-process of elimination.
Cool, thanks. I'm definitely interested in your outcome.
I guess my point with this and related threads is that, especially for AP3 users, addressing possible issues is less-difficult than it looks or sounds most of the time. I don't claim to know everything and can't look at a single log and come to a legitimate/correct answer, but anyone can rule out possibilities one step/test at a time and should be able to reach resolution. Sometimes it's a bit time-consuming and each fault may require a different overall approach, but it gets easier the more you look at and analyze your data. A lot of times in aviation that is the only way to correctly diagnose a fault that isn't directly covered in manuals-process of elimination.
Cool, thanks. I'm definitely interested in your outcome.
Okay I pulled my plugs, they honestly don't look to bad, about 10k miles on them, Motorcraft SP532. I cleaned my panel air filter. Last thing, I drove around until the gas light came on, then drove another 20 miles to make sure I am almost empty, pumped 1gal of E85 and the rest 93oct Costco gas and what do you know, the car gods smile down upon me and negative corrections are gone for the most part! Saw +3* this morning on some pulls and had a small hiccup of -.65* on Cyl.1 No more Sunoco gas for me
For sure, I'm quite often at the Whole Foods in Fairfax on Thursday for their $0.39 wings. Haha I'm always wrenching on my car or cleaning it. My neighbors think I'm crazy because I actually use the garage to park my and my wife's car in there or are usually working on them. 90% of people around here use it to store junk.
I have had actually better luck with Sunoco elsewhere but for some reason in NOVA it does work well with my car and apparently others as well.
I have had actually better luck with Sunoco elsewhere but for some reason in NOVA it does work well with my car and apparently others as well.
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