NefMoto

Hi!
What experiences have you made at sparkplugs with its heat ratings for your tuned S4 or RS4?

How far does the colder spark plug take effect on knocking? Where is the limit to carbon fouling?

Stock in europe NGK Platin are used at S4 with "6´" heat value RS4 with "7´" heat value.

Is it possible to get NGK PFR8Q anywhere? I didnt find them yet.

Regards

hello,
i use pfr7q up to 750HP with no problems!
pfr8q do not exist!

I've been using PFR7Qs in my stage 3 S4 for a while and I did not really have any issues. Now I am running bosch sidefires.
I also converted to FSI coils and thrown my ICMs out, and theoretically these coils would allow running a larger gap, but I did
not test that yet.

The best experience with high boosted S or RS4 engines I have made with a modified "NGK PFR7Q 7963 Platin" spark plug, with a changed electrode gap of 0,55mm.

NGK BKR7E - they are copper plugs.  I change them every time I change my oil. 

I don't understand why anybody would ever use a platinum plug in a performance application unless changing the plugs required pulling the engine.

Well on the S4 it is not a 5 minute job, sometimes it takes me 1.5 hours to change plugs
and it's a pain (For me). BKR7E is what i've been using for a while as well, but I just don't
feel like gapping all the time, but that's all because i am _super_ lazy. :)

Do you have bigger inlet pipes in the way or a cold air setup that's difficult to remove?  The only thing I have done to make it easier to do is use a socket head cap screw on the coils near the inlet pipes so I can use a ball driver to remove them.  I'd be surprised if it took me all of 10 minutes, including beer consumption :D

Well I have to remove the airbox, move all the parked heating hoses and the coolant reservoir out of the way and be really careful to avoid breaking a T piece which I did once and had coolant spraying all over. After that it should be fine :) Actually now it would be more easier because I've converted to FSI coils so I don't even have to unbolt the coils anymore just pop 'em out. Maybe my problem is that I was always doing it in my friend's garage and we probably spent a lot of time chit-chatting and smoking :) ... or maybe I should not compare changing the plugs on my brother's Opel Corsa 1.2, which is exactly 3 minutes :)

NGK PFR7B, NGK PFR7Q, NGK BKR7EIX for medium power.

NGK BKR8EIX for more than 230hp/liter.

Thumbs up!
Great Info!

Thanks a lot.

reactivating this question:

any proposals for spark plugs for a low tuned 1.8T 5V (180PS) Audi APP engine ?

What do you recoment for a replacement spakeplug ?

NGK BKR6E or NGK BKR7E. i use the 6E at lower boost levels and the 7E at higher boost on a 1.8t AWP engine. Gap either to .028 - .030 and you will be good to go. I get them for ~$2.50/ea so I change them at each oil change.

Sorry for bumping this old thread but want to hear best options for PFR7Q sparks.Do you guy reduce the gap on these ? I ordered it for 1.8T with arround 300-350hp on 1.5boost. Thanks

Edit: Also i need to know what do you guys think about try with different sparkplugs.For example 1 and 4 cyl with BKR7E and 2 and 3 with BKR8E, then read logs ?

If you have misfires then you need to reduce plug gap, simple. For more than 200hp per liter I use 0.6mm.

Really stupid idea, and also you don't need 8 plugs.
With 8 plugs you are going to start having issues with soot accumulation and not burning it off the tips if you use gasoline. 7 is as far as you can go on gasoline in a street car, especially in colder weather too.
On E85 the 8 is a very good idea because ethanol does not soot up the plugs as much and is very prone to pre-ignition.

I dont have misfires, but i have timing pull.Will i have better results with closer gap ? And also your opinion on copper vs iridium/platinum ?
My car is A4 1.8T with 300+ hp on gasoline. 1,5 bar boost

No.
The only difference is the replacement interval.
Copper is just that, replace every oil change pretty much, platinum lasts much longer, and iridium lasts around 20-30% longer than that.
For performance there is absolutely no difference.

I was using PFR6Q and PFR7Q for a while and the car kept eating platinum tips. I moved to BKR6E and now BKR7E and now that doesn't happen anymore (no tip lol).

Why would a car “eat” a platinum tip? Still haven't solved that mystery.

Also, thanks alot for the perspective scale for heat range and gap prj. Thats very helpful.

I always used PFR7B (which are the stock plugs anyway) on my supercharged alfa 3.0 engines,
but its far from 200hp/l .

On an Lancia Delta Integrale 2.0 Turbo with ~580hp we used the same PFR7B gapped to 0.6mm.
They work great.

As far as i know PRF7B and PRF7Q are essentially the same with a different gap from factory.
The PFR7Bs i bought all had a 0.7mm gap.
The PRF7Qs should have a 0.8mm gap (i did not verify that, only have been told so)