running ngk sparks, Car started to missfire under boost, I'm going to check the maf sensor see the condition and clean it. If not fixed I'm going to purchase new plugs, -coils have 10k-

thinking to go with oem : Spark Plug - Bosch FR-6-LDC , Beru 14 FR-6 LDU, (7410)

 

exactly. ngk is for my husky. sheesh.

said it once i'll say it again. pre gapped out of the box but if you wanna dbl check? .027 is golden for a tuned car.

add: if you're "cleaning"? your maf? just replace it!

 

All Bosch FR 6 LDC I have checked in the last three years are pre gapped at 0.036 out of the box.

To get to 0.027" they need to be re-gapped then.

 

I run a .018 gap on ngk single electrode copper plug. No issues. Drop the gap before chasing plug brands around

 

I run Denso iridium IK22's

 

I run factory Bosch 7410's at ~.034(on average what they come out of the box) and have no issues, run mine about 20k km.

 

I have ngks colder plugs but i THINK id like to stick with bosh oem plugs, Was recommended to use NGKs, i used them in my EVO's as well.
so which plug you guys recommend (part #)- I'd like to order them from Pelican parts. also good time to check for boost leak and get new maf sensor. (if needed) I have no fun in this weather anyways, cold streets, wet. so i may do it after winter. (drive my pinto all year round)

 

last time i checked they were 027 and i opened the box. however i was told in NO uncertain terms.. also many years ago that 027 is what i should gap. the question now would be which aspect is "wrong"? assuming one of them is, and i dont have one to check.

i would go with the "pre gapped" notion out of the box if I had to pick one?, as I've changed plugs out of the box far more times than i have gapped them. i don't bother often enough. but i also i dont think anyone argues against the notion that the DO come "pre gapped" with that cardboard around the electrode(s) and their paperwork below suggests this is true.

someones got one lying around! open it up and check the gap! that will put that to rest pretty quick lol

but 027 to 034 is a pretty wide difference, i'll admit lol

 

one other way to look at using a beru/bosch "6" is that when the cars were first released? the "stock" heat range and oem fit was a 5! so the wisdom of now using a 6 esp in any tuned car should be clear and is in fact "now" the oem recommendation. while it was not when the cars were first released.

porsche began recommending ( using bosch/beru anyway.. ) going with a hotter plug to a "6" from a "5" for the reasons a hotter plug would work better and burn off more deposits day to day, esp in a tuned car. ngk go the other way around iirc? e.g. a 6 is colder than a 5.

"Bosch Spark Plugs are pre-gapped at the factory. In most cases, that gap is indicated on the package. If the gap is adjustable and different from the gap specified by the engine manufacturer, it needs to be adjusted. For
Bosch Spark Plug Cat. Rev. 2000 Page 7 proper performance and exhaust emissions,BtohscehgSapparkmPulusgtCbaet. Rweivt.h2i0n00±0P.a0g0e47" of the specified value. For most applications, the pre-set gap is correct.

 

ok question as followS:

which spark plugs would you recommend for tuned 996 with exhaust. Which plugs do you run., I dont want this to turn into which oil should i Use

 

Brand new FR 6 LDC. Wire gauge 0.035" is loose, 0.040" doesn't fit.

The question is does the gap make any difference? I know of at least one tuner who recommends a gap of .032" to 0.034" on the FR 6 LDC

Stock seems to be 0.036" according to the Bosch box.

Three different folks in this thread, three different gaps...

The only thing I know for sure, is that as the miles pile up the gaps grow and eventually the plugs will misfire.

So doe the gap make any difference or is it just another round of "my special sauce" makes the car faster with "my tune"?

 

a guy just had a thread the other day in here and i told him the same thing use the beru/bosch fr6 ( its like STANDARD and has been for tuned cars for YEARS! ) and said by reply the he also just also asked tony @epl the same question and his answer ( as reported in his thread in reply to me ) was to use exactly those the beru/bosch fr6ldc! why mess with success?! they are so recommended it isn't even funny, and i swear on my children's college fund that they are PRE GAPPED so who cares! just put em in! we are not re-inventing the wheel here, and yes, there are about 6 other type of plugs you can use from ngk to denso iridium to platinum whatevers.. I'm sure champion has a similar heat range or

spend the XTRA MONEY and get the GT2RS plugs! here:
Spark Plug, Bosch FR-6-DPP-332 S
Part #: 999-170-103-90-M14



in other news..i was just outside fkg with the car a bit and will smith ( yeah, that will smith just came down the drive and asked me if this big dog he had in tow was mine. i should've asked him what gap he recommends! malibu is a wierd place lol


here, found it: don't take MY word for it lol

 

Are there any correlations between higher boost and smaller spark plug gaps, 0.018"as in less or no misfires?

Too big of a gap 0.036"may lead to more misfires in no boost condition?

Not looking for spark plugs brand advice...

 

By running a smaller gap you reduce the chance of misfire caused by plug blowout due to higher boost. This also reduces the area that spark can occur so the risk of not getting a complete burn is there. Its a give and take. I would prefer incomplete burn to a misfire by blowout

 

Generally speaking,
Larger gap creates more power.
Smaller gap better guarantees a complete spark/lack of blow-out.
You want the largest gap you can maintain consistent spark with.
Dependant on quality/power of ignition components, and cylinder pressure/ignitability of contents.