B7 A4 2.0T Spark Plugs Replacement Guide v2.0

[turbo944s2]

Anyone running over 25 psi, if so what are your plugs gapped at?

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[Jake@JHM]

Anyone running over 25 psi, if so what are your plugs gapped at?

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What turbo and what PSI at redline

[turbo944s2]

Gtx3071r 27psi Max tapering down to 24psi (roughly).

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[Jake@JHM]

Gtx3071r 27psi Max tapering down to 24psi (roughly).

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Try .025 of you are using a single electrode.

These should work great out of the box https://jhmotorsports.com/shop/catal...27t-p-686.html

[Hightekflytech]

Try .025 of you are using a single electrode.

These should work great out of the box https://jhmotorsports.com/shop/catal...27t-p-686.html

Do those come pre-gapped? Or do they have to be set?

[Jake@JHM]

pre

[Firefox250]

Jake have you guys ever used a non-resistor plug like this one?

NGK 7173 R5672A-8 Racing Plug
https://www.ngk.com/product.aspx?zpid=10047

[Jake@JHM]

Jake have you guys ever used a non-resistor plug like this one?

NGK 7173 R5672A-8 Racing Plug
https://www.ngk.com/product.aspx?zpid=10047

I wouldn't use it on an Audi unless you have your sensors coded out etc.. they make too much noise.

[Okedokey]

Good price on the FR5DTC. $60 AUD for 8 shipped.

http://www.ebay.com.au/itm/152079968...%3AMEBIDX%3AIT

Oh and this was useful too.

http://www.whybee.net/brands/BOSCH/P..._10%5b1%5d.pdf

[Mister W]

What would be the life expectancy of these spark plugs? I've saw BKR7E have to be change each 5000 miles, is it right?
What about the Iridium version the BKR7EIX and BKR8EIX and the the tri-electrode Bosch FR5DTC ?

[esandes]

Bosch fr5dtc discontinued?

[Jake@JHM]

Bosch fr5dtc discontinued?

https://jhmotorsports.com/shop/catal...42t-p-686.html

[esandes]

Thanks Jake. Here's what the Porsche dealership said when I asked for the FR5DTC:

The spark plug number that you are looking for does not cross reference to anything we use. Using Google there seems to be some references to that number being discontinued, please see attached address.



https://rennlist.com/forums/964-foru...continued.html



I checked their reference that they are the same as the 964 plug , but I checked ours in stock and they are FR6DPP332.

Here's a reply when I posted a link of the same plug for sale from another vendor:

Yes , that does reference our part number … 999 170 183 90 , but has a completely different Bosch number as I noted on my original email. Whether they are compatible , I have no way of knowing.

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It seems like the Bosch site doesn't even show copper trielectrodes anymore if I am not mistaken.

[esandes]

https://www.sparesbox.com.au/bosch-s...-0-242-245-539

Here's a link with cross references including FR5DTC and 7403. Some vendors recognize both part numbers, others just 7403.

[Jake@JHM]

Thanks Jake. Here's what the Porsche dealership said when I asked for the FR5DTC:

The spark plug number that you are looking for does not cross reference to anything we use. Using Google there seems to be some references to that number being discontinued, please see attached address.



https://rennlist.com/forums/964-foru...continued.html



I checked their reference that they are the same as the 964 plug , but I checked ours in stock and they are FR6DPP332.

Here's a reply when I posted a link of the same plug for sale from another vendor:

Yes , that does reference our part number … 999 170 183 90 , but has a completely different Bosch number as I noted on my original email. Whether they are compatible , I have no way of knowing.

----------

It seems like the Bosch site doesn't even show copper trielectrodes anymore if I am not mistaken.

We still get them and stock a ton of them if you want them. Great price too.

[esandes]

We still get them and stock a ton of them if you want them. Great price too.

Shipping makes it pricey for me. Bosch's site doesn't even show copper plugs anymore.

I ordered "7403"s from napa. The napa site doesn't provide search results for FR5DTC but they do for 7403. Your site and many others show both part numbers for the same plug.

[esandes]

Bosch told me they no longer make copper plugs. What's left is what's on shelves apparently.

[Acomat05]

Great right up and please keep adding more info

[masaichris]

Thank you for this awesome guide.

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[ksteezy]

I'm a little confused as to which plugs to get for my jhm tuned car..

running a stock 2.0t internals aside from the GFB Diverter valve + jhm test pipe. I'm flashed to jhm stage 1 CA 91 gas. car threw a misfire for cyl3, discovered that my oem coils are finally crapping out at 100k miles. Ordered the red r8/s4 coils which supposedly deliver a slightly higher voltage...

Considering cost and frequency of change, which plug would be best for my car? Car is based in bay area CA

Bosch Tri-Electrode Copper Plugs (FR5DTC) -1 range colder than stock for 2.0T FSI - what interval would I be changing these out ?
or
Bosch Tri-Electrode Copper Plugs (F6DTC) - same range as stock for 2.0T FSI - what intervals would these be changed on?

[Jake@JHM]

I'm a little confused as to which plugs to get for my jhm tuned car..

running a stock 2.0t internals aside from the GFB Diverter valve + jhm test pipe. I'm flashed to jhm stage 1 CA 91 gas. car threw a misfire for cyl3, discovered that my oem coils are finally crapping out at 100k miles. Ordered the red r8/s4 coils which supposedly deliver a slightly higher voltage...

Considering cost and frequency of change, which plug would be best for my car? Car is based in bay area CA

Bosch Tri-Electrode Copper Plugs (FR5DTC) -1 range colder than stock for 2.0T FSI - what interval would I be changing these out ?
or
Bosch Tri-Electrode Copper Plugs (F6DTC) - same range as stock for 2.0T FSI - what intervals would these be changed on?

Bosch Tri-Electrode Copper Plugs (FR5DTC) - anywhere from 15-25k miles or as you see fit.

https://jhmotorsports.com/spark-plug...-and-4-2t.html

[ksteezy]

Thanks Jake! What's the benefit of running a colder range if we're going to be using copper plugs? I'm wondering about performance of the FR5DTC vs F6DTC.

Also considering that the red R8 coils 06E905115F have been tested to deliver a better spark (via hcs tuning i think it was), does that mean using a spark plug with a gap of .032 should be okay then? Since spark plug gaps tend to get bigger over time and use

[Jake@JHM]

Thanks Jake! What's the benefit of running a colder range if we're going to be using copper plugs? I'm wondering about performance of the FR5DTC vs F6DTC.

Also considering that the red R8 coils 06E905115F have been tested to deliver a better spark (via hcs tuning i think it was), does that mean using a spark plug with a gap of .032 should be okay then? Since spark plug gaps tend to get bigger over time and use

No problem!

Honestly, we recommend the factory coil packs (which are also used on the RS4). You still want a tighter gap when more boost is involved. You will also not need to gap the FR5DTC.


Here is a blurb from my old B7 build thread regarding spark plugs:

UPDATE:


We noticed right away when we started the development on our JHM 2.0T Tuning some months back that my A4 was being a bit hesitant and misfiring as soon as the car would start boosting above 10psi. Our first instinct was that there was an issue with my spark plugs based on our years of firsthand experience with turbo Audis in our shop. After removing my spark plugs, we checked the gap and they were all at .045 which is why I was getting the misfire. The plugs that came out of my car were Denso PK20PR11 plugs, and looking at their website it shows that those are the plugs that Denso recommends for the B7 A4 2.0T, yet they come at their recommended gapped of .044. However, Audi recommends that the plugs be gapped at .028 which is quite different than a .044 gap, so always make sure your plugs are at the right gap before you install them as whoever installed these plugs in the car before I purchased it, did not. The increased gap over stock (recommended is .028 by Audi) adds more resistance for the coil to fire across the gap. This is okay sometimes when boost levels are stock since the engineers have to factor in spark plug wear. However when you add boost it increases the resistance to jump the gap and it is just like increasing your gap even more, hence the misfires. My car most likely would have been okay if the installer of the Denso plugs would have regapped them to spec. However we do not believe in using plugs that aren’t a close to stock gap since they were most likely engineered for a non-boosted application.

Denso Plug:



I replaced my Denso Spark Plugs with the OEM Bosch Spark Plugs we have on our website HERE! I made sure they were gapped at .028 prior to install for our tuning development purposes. This was because we have to make sure that everything is functioning 100% perfect at the stock plug gap for those people who would be purchasing the tune and still on their original plugs (I know the gap size will increase over time as they get used, however we have seen quite a few very low mileage 2.0Ts). Needless to say we would have been okay with the off the shelf gap of .032, but they would have .004 gap less to work with as they wore down with mileage.

Spark plugs are essentially the center of your car’s ability to run and make power. When you increase your boost, you are increasing your cylinder pressure which makes your coil packs have to work harder to jump the given gap. The shorter gap will also help insure a better fire with more consistency. Considering that your plugs can fire over 100 times a second, making sure that you keep the best gap for your application is a must. That way you will always have a proper burn and not have a spark plug caused misfire. That being said, a .028 (Factory spec) gap is going to be much less strain on the coil packs/motor than .044, hence why I was misfiring when my cylinder pressure increased.

In addition, the spark plug works as a heat exchanger by pulling the unwanted thermal energy from the combustion chamber. The heat range given to a spark plug defines the spark plugs ability to dissipate the heat. Both Bosch and NGK are popular spark plug manufacturers and their heat range designations both utilize a number between 1 and 10 and are often times confused with each other. NGK goes down a number every time the heat range gets HOTTER and Bosch goes down a number every time the heat range gets COLDER. For the 2.0T the OEM Heat Range for NGK is “7” and the lower the number for NGK, the hotter the heat range is (like stated previously). For example, the BKR6E is going to be hotter than the BKR7E. The OEM Heat Range for Bosch is “6” and the lower the number, the colder it is (like stated previously). For example, the F5DPOR is going to be a colder plug than the F6DTC. The rate of heat transfer for the spark plug is determined by a few things; the length of the insulator nose, gas volume around the insulator nose, the material of the center electrode, and the construction of the porcelain insulator. Keep in mind, the spark plugs heat range has no relationship to the actual voltage that is being transferred through the spark plug!

There is a lot of information to take in to understand sparkplugs, and at time can be quite confusing. That is why we have done the research for you and are here to supply you with the correct sparkplugs for your application.



OEM Replacement Spark Plugs:

There are two different spark plugs that came in the B7 A4 2.0T. Therefor both choices will be a direct replacement for your vehicle. We have had great experiences with both of these manufactures and choice will ultimately come down to preference.

Bosch - FR6KPP332S Long Life Platinum (Heat range 6)



Click HERE for more information!


NGK - PFR7S8EG Laser Platinum (Heat range 7)



Click HERE for more information!


Higher Boost Applications:

The following plugs are pre gapped at a perfect width to keep misfires away on high boost applications. We use these plugs in our race cars and customer’s cars with great success.

Bosch - F5DPOR Platinum Sidefire (Heat range 5, one heat range colder than stock)



Click HERE for more information!


Bosch - FR5DTC Tri-Electrode (Heat range 5, one heat range colder than stock)



Click HERE for more information!

Bosch - F6DTC Tri-Electrode (Heat range 6, same heat range as stock) Note: This is a good lower cost replacement for stock cars or cars mostly stock with just a tune.




Click HERE for more information!

NOTE: The spark plug torque spec is 30nm or 22 Ft-lbs. Remember to use Anti-Seize on the threads for easy removal and corrosion protection.


If you have any questions please feel free to ask. I am here to help!



Jake

[A4TQS]

Thanks for the info.

[megarex]

Time to do my plugs - Anyone try the NGK Ruthenium HX? FR7BHX or FR8BHX?

[MALMGRDC]

Time to do my plugs - Anyone try the NGK Ruthenium HX? FR7BHX or FR8BHX?

Never heard of those

[Jake@JHM]

To this day, I still highly recommend the FR5DTC plugs we sell. Cheap and perform excellent

[megarex]

I haven't used the FR5DTC yet, l'll give them a try.. But I do want to know more about the Ruthenium plugs - anyone ever dyno with them?


This is some strong marketing from NGK, I am curious if this new alloy will stand up to these claims with our modified cars. If what they are saying is true we could advance our timing some.

[A4_B7_BINGO]

This is just bad information when you break it down. Yeah the iridium's last longer, yeah the Coppers are cheaper, BUT... What this person fails to realize is that Copper is w/o a doubt the better plug! Why? Because Copper is the best conductor made in plugs. (Gold can get a little spendy)
If you are driving an absolute stock car on stock boost, and shift under 3k RPMs, then by all means, use the Iridium's along with your full Synthetic oil and change them every 8k miles. But if you have a tune, bigger Turbo, injectors etc etc... Than you need to be using Copper Plugs, and a higher Visc Dino oil. I know that most Audis don't make more than 300-400awhp but if you run high boost and have a built bottom end, than Synthetic oil is pointless bc you should be changing it every 3k/3mnth and you should be running high Visc.
My Evo gets a plug & oil change every 3k miles and I use Copper plugs and Valvoline VR1 20w50. Of course it makes twice as much HP/Tq than my A4 B7 does, but that doesn't mean that my Audi doesn't get anything other than the best treatment!
The point is, just bc something lasts longer, doesn't mean it's the better 💥💵.

[a4937]

Is there a newer equivalent to the F5DP0R? I was looking for some and they're crazy expensive for spark plugs, assuming you can find them.

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[a4937]

I know I have a 1.8T, but I swear by the Bosch F5DPOR's. I won't use anything else

Can you still source these???