OK, due to a lot of pressure from all you "ping" people out there, the plugs I am using, no ping, greatly smoother power delivery, etc. with Wett 1.0 bar chip:<p>Bosch Platin F5DPOR<p>single side electrode<p>Same physical reach (leagth), etc. as stock three electrode plug.<p>Install torque 22 ft lbs. (may not seem like much, but you will feel washer compress, and it is an aluminum head)<p>Hoppen has them for 17 or 18 bucks, I think.

Ok, here is the interesting part.<p>The stock plug for the 1.8 is<br>F6LTCR (multi ground electrode)<p>The one Terry used was<br>F5DPOR (that should be just one step colder than stock 6 - 5) Platinum<p>The one that everyone else swears by is the <br>F2CS (4 ranges colder that stock 6 - 2) Silver<p>I've got one set of plugs that are even stranger that this, but the ground the numbers off them, so I have no idea what they are. They have the ground electrode to center electrode contact on the side not the top as normal. The F2CS's are normal with contact on the top.<p>Oh, well, bottom line, what ever works. I can tell you this, there is no comparison between the Beru's and the F2CS's. The Bosch plugs made the low end feel much better, and throttle response was WAY better. I gapped them at about .6 - .7mm. Stock is .7 - .9mm<p>Hopefully some more useful data.<p>Alan

Question about "cold" plugs:<p>I had some *slight* pinging with my Wett chip during the hottest summer days under full-throttle acceleration (at least I noticed this last summer on a few days). So here's my question, what affect will "colder" plugs have during colder weather (temps below freezing). Will I have trouble starting the car in these temps? Will it idle rough? Any idea?<p>Perhaps the best solution for me might be the plug that is one "range" colder versus the 4-ranges colder plug (F2CS Alan mentioned) Any thoughts?<p>Andy Hedin<br>'97 A4 1.8Tqms, Wett 1.0 Bar, E-codes....<br>

I usually use the "hottest" plug that I can, for street cars anyway. Going one range is not drastic -- three or four may be a lot.<p>Using too "cold" a plug can lead to fouling at idle or starting problems at very cold temps (not a factor for me in Phoenix !). They can also affect emissions performance (this is a factor in Phoenix).<p>Plus, I go with what the engineers at MTM and Wett have found to work best..............<p>Alan & I exchanged emails all morning about this subject........

Alan, Do you even have any concept of what spark plug temp means? Obviously by your chose you don't. You assume, and I don't need to tell you what that means, that extreme changes are better. Little do you know that between each heat range there are multiple applications. The plug and resistor have many combinations to work with the correct application. I am very surprized that YOU with all your professional imput have not metioned this. Please review your info on spark plugss and if you need factory support to make stable comments, I WILL BE HAPPY TO ASSIST.<br>