8 replies to this topic

[Paddyn123]

Had a quick search and found totally different info, so thought I'd ask myself. What are considered the best spark plug for a standard vxt and a stage 1 vxt? I've seen it mentioned about larger gap for stage one but then smaller for stage two upwards? Can someone throw a link up with some tried and tested? Ngk Iridium seem to be mentioned but they have a gap of 0.6 which contradicts other opinions saying 0.8 standard and 1.2 for stage 1! I don't know who to believe Answers on a postcard. Thanks in advance.

[chris_uk]

i gap the plugs to 0.711 mm 

[Paddyn123]

Thanks for the reply Chris UK. Do you gap them yourself? What plug do you use ? Brand etc and what is your car running... Thanks

[chris_uk]

It was a customers stage 2 turbo. I gapped them with a feeler gauge, i did have one car tho which ised to missfire unles they were gapped to 0.608 no idea why. They were iridium BKR6EIX

[manus]

It was a customers stage 2 turbo. I gapped them with a feeler gauge, i did have one car tho which ised to missfire unles they were gapped to 0.608 no idea why. They were iridium BKR6EIX

Think the higher pressure/density under full boost makes it more difficult to spark. Decreasing the gap a bit will ensure you have ignition.

[Nev]

Had a quick search and found totally different info, so thought I'd ask myself. What are considered the best spark plug for a standard vxt and a stage 1 vxt? I've seen it mentioned about larger gap for stage one but then smaller for stage two upwards? Can someone throw a link up with some tried and tested? Ngk Iridium seem to be mentioned but they have a gap of 0.6 which contradicts other opinions saying 0.8 standard and 1.2 for stage 1! I don't know who to believe Answers on a postcard. Thanks in advance.

 

There is no fixed formula for gapping really as compression values, boost value, fuel quality, injector spray pattern, swirl etc all vary from car to car. As a rule of thumb start off gapping to OEM level, and then if you suffer ignition problems at high load then reduce the gap by 0.5mm in steps. This process assumes your coilpack is in good order BTW.

[chris_uk]

It was a customers stage 2 turbo. I gapped them with a feeler gauge, i did have one car tho which ised to missfire unles they were gapped to 0.608 no idea why. They were iridium BKR6EIX

Think the higher pressure/density under full boost makes it more difficult to spark. Decreasing the gap a bit will ensure you have ignition.

I understand the principle behind it, i just cant see how 0.1 mm would make all the difference. but it did.

[chris_uk]

Had a quick search and found totally different info, so thought I'd ask myself. What are considered the best spark plug for a standard vxt and a stage 1 vxt? I've seen it mentioned about larger gap for stage one but then smaller for stage two upwards? Can someone throw a link up with some tried and tested? Ngk Iridium seem to be mentioned but they have a gap of 0.6 which contradicts other opinions saying 0.8 standard and 1.2 for stage 1! I don't know who to believe Answers on a postcard. Thanks in advance.

  There is no fixed formula for gapping really as compression values, boost value, fuel quality, injector spray pattern, swirl etc all vary from car to car. As a rule of thumb start off gapping to OEM level, and then if you suffer ignition problems at high load then reduce the gap by 0.5mm in steps. This process assumes your coilpack is in good order BTW.

You mean 0.1mm... They start at about 0.8mm.

[Nev]

 

 

Had a quick search and found totally different info, so thought I'd ask myself. What are considered the best spark plug for a standard vxt and a stage 1 vxt? I've seen it mentioned about larger gap for stage one but then smaller for stage two upwards? Can someone throw a link up with some tried and tested? Ngk Iridium seem to be mentioned but they have a gap of 0.6 which contradicts other opinions saying 0.8 standard and 1.2 for stage 1! I don't know who to believe Answers on a postcard. Thanks in advance.

  There is no fixed formula for gapping really as compression values, boost value, fuel quality, injector spray pattern, swirl etc all vary from car to car. As a rule of thumb start off gapping to OEM level, and then if you suffer ignition problems at high load then reduce the gap by 0.5mm in steps. This process assumes your coilpack is in good order BTW.

You mean 0.1mm... They start at about 0.8mm.

 

 

Ooops, yes, mistake by me, I was probably thinking in thou.