How to Install Spark Plugs & R8 Coil packs on the b8/b8.5 Audi 2.0T A4/A5/Q5/A EA888 Gen2 DIY
My 2014 Audi A4 with the B8.5 Body uses the EA888 Engine code and is shuddering a little bit on idle.
My car has 68K miles and probably has the original spark plugs.
I like to change plugs every 30-40K miles on turbo engines because it helps to keep MPG efficiency higher.
In fact, I averaged 25.2MPG over 1,500 miles before swapping spark plugs and what seemed to be the original coil packs and my MPG has risen to 27.4 over the last 400 miles.
I wouldn’t have even changed the coil packs other than the fact that I could upgrade them to the Audi R8 Coil packs in order to prepare for tuning the car to Stage 1.
GET THE PARTS (eBay Affiliate):
– NGK Ruthenium HX Spark Plugs: https://ebay.us/z6ajdz
– NGK Audi R8 Coil Packs: https://ebay.us/lIIJzP
The S4 does use the same coil pack as the R8 (4.2 and 5.2), PN 06E-905-115-E.
The 3.0T and 3.2 engines also use this PN. The 2.0T, 4.2 (except R8), 4.0T and W12 use different coils.
A while back, someone looked into the differences with the ‘R8’ coils vs other red-tops, 2.0T black-top and Okada coils. I believe they reference ‘stock’ as 2.0T coils. For those of you looking for more technical data on these coil packs, here is what we’ve found so far with our bench ( oscilloscope ) testing:
1) These coils can be used on your FSI/TSI engine at ANY level of modification. They function just as well on a dead stock car as a highly modified one.
2) They are NOT the same coils with red housings. The secondary circuit on the R8 coils has a higher resistance (more windings) than the stock coils. In fact the secondary circuits were slightly closer to the Okadas we tested than the secondary of the stock coils.
3) We tested these between 12 and 16 volts (remember if your alternator is charging properly the input will be right around 14). We tested them between 200 and 16,000rpm. The stock coils started to misfire at a much lower rpm than the R8’s with a stock spark plug gapped @ .032″.
4) The spark was visibly brighter and more intense on the R8’s when compared to the stock coils @ every rpm we compared in the stock rev range. We didn’t compare anything under 1,000rpm.
5) We were able to open the gap on the plugs much further with the R8’s than the stock plug with out misfiring at the same rpm/voltage.
6) Here is what we were finding as an AVERAGE on the secondary circuit for each of the coils. Stock: 3.3 M ohms 5 cylinder coils: 4.75 M ohms R8’s: 5.31 M ohms Okadas: 6.2 M ohms