I've been running a 5k Ohm plug for ever (NGK PFR7B)...and I am contemplating a switch to a 1k Ohm plug (PFR7Q).
I notice one of the NGK (stock/OE plugs) is also a 1k OHM plug (PFR7S8EG).
Another popular plug is a 5k Ohm plug (BKR7EIX).
I have been looking into the whats and whys on the two, the 1k and 5k Ohm plugs. I understand the 1k Ohm plugs will allow a hotter arc. But I was hoping to find a spark plug guru who would explain more thoroughly as to why you choose one over the other. I do know of the other resistance factors which are applied to the overload figures. But with our OE coils having a 3.3 M Ohm secondary winding...I don't expect lowering the plug resistance to exceed this and burn coils often. That is, if I correctly understood what I have read up to now.
I did see an episode on some car thing/show (@ 8:00 in the link below) where they modified a MK7 Golf R. At the end they switched to the PFR7Q-1k Ohm plug used in the RS6 and gained more than or near 30 HP. I know not what they removed though...and granted, they mention tweaked the tune along with the RS6 plugs...but why? is the question. Was it for a more efficient combustion and to burn fuel more efficiently?
I notice one of the NGK (stock/OE plugs) is also a 1k OHM plug (PFR7S8EG).
Another popular plug is a 5k Ohm plug (BKR7EIX).
I have been looking into the whats and whys on the two, the 1k and 5k Ohm plugs. I understand the 1k Ohm plugs will allow a hotter arc. But I was hoping to find a spark plug guru who would explain more thoroughly as to why you choose one over the other. I do know of the other resistance factors which are applied to the overload figures. But with our OE coils having a 3.3 M Ohm secondary winding...I don't expect lowering the plug resistance to exceed this and burn coils often. That is, if I correctly understood what I have read up to now.
I did see an episode on some car thing/show (@ 8:00 in the link below) where they modified a MK7 Golf R. At the end they switched to the PFR7Q-1k Ohm plug used in the RS6 and gained more than or near 30 HP. I know not what they removed though...and granted, they mention tweaked the tune along with the RS6 plugs...but why? is the question. Was it for a more efficient combustion and to burn fuel more efficiently?
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