I have a 4x4 sapphire running greens, T34 etc and when i accerate hard the car seems to hold back (missing) when almost at full boost 20psi??

Any ideas as this is really annoying

 

what plugs are you using on your stage 3 set up? sounds like the spark's being blown out on full boost maybe

 

NGK9's

How can i check if the spark is being blown out??

 

I had those plugs in mine and I know that when I booted my saf it would feel like it was kangerooing/surging unless I feathered the throttle if you get what I mean (causing me to lose a few straight liners ) I now have Champion C59's and they haven't let ME down yet and mine's running 350bhp(been told their good for 400 bhp) NOW some people will say that Champions are shit and you should use X Y or Z think it could be a case of trial and error if your car's all set up correctly then up to u m8 I speak from MY personel findings they cost about Ł30-Ł40 a set

 

I use PP8's gapped to 0.6mm, and i run 25psi for 350 bhp. Mines just started to miss slightly, so i need to change em. Price has always put me off other plugs, but PP8's are only 25 quid from PJ's. Whether C59's would last longer i dont no, iv never used em.

 

I've always been led to believe PP8 were a standard Escort Cos plug and NOT any good for 300+ bhp cars, so just goes to show then

 

I would get em out quick sharp mate

 

I thought that to to be honest as it may end up in

 

CheeRS for the replies guys i will look at the plugs first then. Would this also cause the car to be a bit jumpy when in high gears with lowish revs??