1 or 2 step colder plugs.. wheres the best deal
Originally Posted by DaveO
We tried to get an experienced based Iridium Spark Plug discussion going in the Premier Members Sport Z Magazine Forum. Unfortunately Dennis, Ben and I weren't able to generate much interest... so far.
I've been running one step colder pluges in my N/A modified AT Sedan for about 1,500 miles to date. I did this because the engine occasionally knocks on a real hot day, it has always "pinged" on the dyno, the standard spark plugs looked to be running a little hot... and I needed first hand experience to develop the "Adding Spark to the VQ" article - see the Summer Issue of Sport Z Magazine.
According the the the factory service manual, my car meets at least two out of the three criteria for the "Cold" plug...
1) Spark plug knock;
2) Extended high driving;
3) Frequent high engine revolution. (sometimes)
The service manual indicates three spark plugs can be used in our VQ engine.
Standard type - PLFR5A-11
Hot type - PLFR4A-11
Cold type - PLFR6A-11
I believe the part numbers are...
Nissan #22401-5M015 = NGK PLFR5A-11
Nissan #22401-5M014 = NGK PLFR4A-11
Nissan #22401-5M016 = NGK PLFR6A-11
and the "P" = platinum. If you drop the "P" it becomes the NGK copper plug number.
The subjective results?
1) Slightly improved power and gas mileage. (May just be from the new plugs.)
2) I cleaned the inside of my exhaust tips when installing the 6s. To date the pipes have remained reasonably clean. At least the same as with the 5s.
3) No pinging on the street... but no re-dyno to really test the results so far.
That's my story and I'm stickin' to it -- at least for now.
I've been running one step colder pluges in my N/A modified AT Sedan for about 1,500 miles to date. I did this because the engine occasionally knocks on a real hot day, it has always "pinged" on the dyno, the standard spark plugs looked to be running a little hot... and I needed first hand experience to develop the "Adding Spark to the VQ" article - see the Summer Issue of Sport Z Magazine.
According the the the factory service manual, my car meets at least two out of the three criteria for the "Cold" plug...
1) Spark plug knock;
2) Extended high driving;
3) Frequent high engine revolution. (sometimes)
The service manual indicates three spark plugs can be used in our VQ engine.
Standard type - PLFR5A-11
Hot type - PLFR4A-11
Cold type - PLFR6A-11
I believe the part numbers are...
Nissan #22401-5M015 = NGK PLFR5A-11
Nissan #22401-5M014 = NGK PLFR4A-11
Nissan #22401-5M016 = NGK PLFR6A-11
and the "P" = platinum. If you drop the "P" it becomes the NGK copper plug number.
The subjective results?
1) Slightly improved power and gas mileage. (May just be from the new plugs.)
2) I cleaned the inside of my exhaust tips when installing the 6s. To date the pipes have remained reasonably clean. At least the same as with the 5s.
3) No pinging on the street... but no re-dyno to really test the results so far.
That's my story and I'm stickin' to it -- at least for now.
When you speak, I listen. Just a quick note. Guys make sure you close your gaps a bit.
Under big pressure in the cylinders its harder for the ignition to do its job. By closing the gaps a bit, helps the plugs fire better. Plus you all should try to degree in your plugs. On super charged or turbo charged cars you should point the open side of the plug to the exhaust valve. There is a lot to talk about degreeing in plugs. One of the biggest plus is you can get good plug readings in all cylinders. A must for FI cars.
Ps Dave Maybe we could get a thread going about this.
Originally Posted by G35_TX
Update....
Been doing some research today and found the equivalent to the stock plugs in our G35.
NGK type LFR5A-11 Copper Spark Plugs
The ones our G35 come with is PLFR5A-11 Platinum Spark Plugs.
Now if you want one step colder LFR6A-11 (colder).
I will be getting some of these soon once my car is here. Copper is the best conductive material you can find for a spark plug, and it provides a better spark. They only last 30k, but for the price of a couple bucks each, its well worth it. The Plats and Iridiums are good plugs for how long they last, but if your into performance, they are not what we need!
Been doing some research today and found the equivalent to the stock plugs in our G35.
NGK type LFR5A-11 Copper Spark Plugs
The ones our G35 come with is PLFR5A-11 Platinum Spark Plugs.
Now if you want one step colder LFR6A-11 (colder).
I will be getting some of these soon once my car is here. Copper is the best conductive material you can find for a spark plug, and it provides a better spark. They only last 30k, but for the price of a couple bucks each, its well worth it. The Plats and Iridiums are good plugs for how long they last, but if your into performance, they are not what we need!
so for FI, which 1 step colder plugs do i use? The LFR6AIX-11 or the LFR6A-11??
bump for the part numbers... I got my car tuned/re-flashed at Technisquare, they reccommended one step colder platinum(OEM type) plugs. I'm NA: headers, HFC's and Cat-back EXH
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