ctusquattro

I am going to name my next child after you.

Quattro527

Every car has different specs that require different gaps. What is "optimum" on my car, may not be on yours.

As a general rule of thumb:
Always use the BIGGEST possible gap that will not break up or missfire. For every 50hp or so, I would drop the heat range about 0.004" or so. I do NOT know WHY Audi gapped 0.027"!!!... according to the part number to the OEM plug, it should be gapped to at least 0.0315"... Shieze!..hehe

But personally...I would use 0.032" as a reference point, either increase or decrease in 0.002" increments til you get it right.

As far as heat range goes, a heat range "#6" will be adequate. Remember, simply changing from platinums to coppers will lower your temps by about 30degrees!

Good luck

Dentist1

adequate. Do you happen to know if they are pregapped. If not where can I purchase pregapped plugs that fit your recommendations.

Thanks

Dolphin/1.8t/Neuspeed 1.2 bar/Sports/Premium/Audi Carbon Fiber Tag/Polished tips/Votex rear spoiler lip

Denon728

Thanks. Im going to get some copper plugs tonight.

Quattro527

I've bought a set of plugs "pregapped" to 0.040"...but I measured them at 0.035"!... many times..the gaps settle during shipping...

-Jeff

jquattro

Great Information, thanks! How have you done your spark plug tuning in the past?

RickDE

which plug and gap for a car with APR stage #1

Spinnetti

GOOD plugs like ND or NGK come with a shield so the gap doesn't get whacked.. never had to adjust any NGKs I got.

Actually there are litterally books written on sparkplug 'blueprinting'... I do it all the time for the race car, but they don't last long on ther street when you do all the tricks..

I still think theres merit in the Iridums.. I'll probably give them a try with a nice fat gap. .030 is nothing for a gap, and torque goes up proportional to the gap...

I think a .045 gap, and a hotter ignition will be just the trick with some iridiums...

Dentist1

so i can buy them at a local place and have them pregapped to .032

Typist Formerly Known as (skene)

when the boost sensor will put you into limp mode if you pass 1.45 bar?

Just out of all curiosity.

Also regarding this post... not to knock you or anything, but you should very well keep in mind not only the instance of what a plug is made of but the actual quality of the design of the plug and the heat it may withstand. Is it possible that the spark plug cannot take the actual heat and so forth brought on by a turbo via heated air. Then the actual plug failing and breaking apart? Just something to think about, because just placing in any type of plug can be cause for +$1000.00 repair bill that Audi will not cough up if plugs other than recommended (not to say they are any better). And you will be the one eating the repairs.

Like I said... Just want to make sure all facts are brought out before everyone runs out and does something they will regret.