Hi all, it's spark plug change time again but the old spark plug box I had with the plug gaps written on it has grown legs and dissapeared :-( I'm running ford genuine 071 c plugs on a h reg 4x4 saph cos running stage 3 with a group a coil. Thanks guys, Gary.

 

0.8 -0.95"
will be fine on that spec, if you get an on boost misfire try 0.75"

steve

 

I had 0.6 I think last time from memory but that was without group a coil and it idled like crap when I fitted the group a coil

 

Just spoke to stu at Motorsport developments and he said 0.65mm

 

Well fitted the new plugs tonight, took it down the duel cArriageway and shit the bed when it pulled like it did took me by suprise! All bAck to normal for now at least lol

 

What gap is recommended for a stage 4?
Gt30 turbo, ID1000cc injectors, 500 plenum, approx 440/460bhp

Using the same plugs as above.

 

I'd ask stu at msd mate, he got it spot on with mine

 

Just make them as wide as you can get away with.

 

Should have mentioned I'm running wasted spark, assume gap doesn't matter?

 

Mine were already set to 0.65mm out the box from ford