R8 Coil Packs

[Pawan2013]

I'm thinking about changing my spark plugs soon and thought i might do the coil packs as well. I saw a couple threats on the b8 a4 of people switching out to r8 coil packs. Can this be done on the s4 too? Is there any difference between the two? Also, best spark plugs?

[lapsandwich]

Pretty sure they're exactly the same as any other newer generation Audi coil pack. Only difference is you can tell people you have R8 coil packs, and they might think you're a little bit cooler then before.

[Sauci]

Pretty sure they're exactly the same as any other newer generation Audi coil pack. Only difference is you can tell people you have R8 coil packs, and they might think you're a little bit cooler then before.

"Might" being the key word

[MrFunk]

If same price go for it. If more you'll be wasting your money.
On that note - can anyone remind me of the maintenance schedule on plugs and coil packs? Is it every 55k?

[chaos2984]

If same price go for it. If more you'll be wasting your money.
On that note - can anyone remind me of the maintenance schedule on plugs and coil packs? Is it every 55k?

There is no service interval for coil packs. They are replaced as failed. I would say you should always keep one with you but that era is over and they corrected that problem with the B7's

[gdawg'05a4]

The S4 does use the same coilpack 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

[BlownOne]

^ you are correct...the s4 uses the same coils as the r8. I changed mine when I did plugs around 40k miles. Search op and you shall find all the info with part numbers.

[mrmomo313]

Others covered the coils. OP, just stick to OEM plugs at 0.028.

IMO, no need for anything different unless you're running dual pulley with higher than stg 2 boost in summer heat. I'm running one step colder this summer then switching back to oem plugs for the fall.