Anyone had any experience of using the NGK BKR7E rather than the oe PFR6Q.

The 6Q is the standard plug and lasts longer, the 7E is a cooler plug and lasts less but is apparently better for modified cars.

Ie will they perform better in a remapped car than the 6Q due to them beeing cooler.

I read Richm has posted bout them favourably, any other opinions?

Hi Sweedish

I have had running problems recently with missfiring and blowing coilpacks.

After a lot of searching (mostly VWvortex) I binned the Bosch super 4's which were recommended after the LPG conversion and changed to the BKR7E's which are a range colder than the standard plugs, and I gapped them at 0.0028 not sure what the metric is? The hand full of Hitachi coil packs that were missfiring under boost are all OK now and the car is running fine.

Karl

hi Karl, thanks for the input, did you only have problems with the super4s or with any other plugs too?

I had been running super 4's from early on as I had a couple of problems when I first bought the car and as they were recommended by the gas fitter I went with them, they did make a big improvement on the car as standard. A lot of the early problems I had were related to the fact it had done 70k+ and the pipe work was eating itself from the inside. After fixing all of these things and a couple of throttle body cleans later I went for a remap had some issues with the first one, which were sorted with the second flash. After that I think the plugs had done a fair bit and I started to lose coilpacks. seemed to be 1 and 3 more often than not so I thought I had a bad cylinder. I got a new set of super 4's to see if it improved and it didn't, so I really started to worry about no3 cylinder. But before I booked it in for a compression test I found some articles on VWVortex about regular coil pack destruction and went with the recommendation of the BKR7e's (especially for a mapped car) and with the LPG it is better to run a plug colder anyway (the super 4's are a wider range plug so have a similar effect)

The problem seems to be if the spark is too big it not only has a problem igniting under higher boost but it also puts more strain on the coilpack. So the BKR7E's are 1 range colder, they are a full copper core which transmits the heat better, and a single electrode takes up less space and does not get in the way of the flame (although the bosch plugs are longer lasting as there are 4 electrodes to burn down the gaps are larger and factory set) I did consider iridiums but I can get a set of four of the NGK's on ebay for £8 so no point. I know they are going to foul a bit more, although not as bad on the LPG but at that price who cares

The Hitachi boltdowns are all OK now thank god, but I have killed off a couple of the normal coils in the process of trying to sort it out.

Hi Sweedish

I have had running problems recently with missfiring and blowing coilpacks.

After a lot of searching (mostly VWvortex) I binned the Bosch super 4's which were recommended after the LPG conversion and changed to the BKR7E's which are a range colder than the standard plugs, and I gapped them at 0.0028 not sure what the metric is? The hand full of Hitachi coil packs that were missfiring under boost are all OK now and the car is running fine.

Karl

Think you meant 0.028" which is 0.71mm

I have Denso Iridium plugs in mine which are gapped @ 0.8mm

How often should you changed plugs in a vrs please

How often should you changed plugs in a vrs please

Std plugs every 40K

Let us know how you get on with the NGK plugs Luca... Si is in the process of packing his ECU off in the post so Beryl is shortly to be remapped...

The only potential problem with a colder plug is if you do alot of short journeys the plug can foul as they dont get hot enough to self clean and eventually cause a misfire

At £8 a set you just need to change them more often. They do seem to be the plug of choice if remapped on VWVortex (although most of the people on there sem to be BT as well) Like I posted, I was having problems with a brand new set of super 4's and it does seem to be down to the boost levels. I was really starting to worry I had a cylinder on the way out and popping coils at £30 a throw was getting old very quickly.

I do think the Gap can be taken up a little bit if you suffer cold starting problems with them as well.