advice whats peoples recommendations for a 4x4 coz engine 500hp ish, whats best spark plug/ heat range, ngk are one of my suppliers so can get these cheaper???????

 

071s all day, cheap good plug.

Steve

 

good as ive got a set to go in mine

 

Not had any issues running them in mine

Steve

 

yep i never had any issues running them in my 3dr at 400bhp

 

071s are fine at this level of tune

 

and they're only around a tenner a set

 

lol something cheap and works on cosworth!!!!

no point going iridiums????? then???

 

No the 071 give a crap idle if you are running nice lean afr,
The Iridiums are 10times the plug imo.

Mark

 

071's are shit, cheap but false economy since they don't last that long.

 

........spot on advice....i use NGK iridiums,quality plug that LASTS

 

do you part number of the ngk iridiums m8??

 

I used BKR9EIX in mine gapped at .65 but mine was no where near your bhp,it was only running greens .

 

Iridium - pish unless you have a good coilpack setup, even then not worth the buck

071's - I also think they are shite....


NGK BCR 8ES all day long for me

 

I used iridium plugs in my bike with good results I suppose thats why I put them in my car.Same outcome on just a grp a coil,the only time they fouled was after sitting ideling for periods of time when the car was not in use (twice over a 12 month period).Other than that,use for 12 months then bin em.Its a pity Tabs is not about,he had a pretty good understanding of plugs imo.

 

071's running with a coil pack in mine , no faults whatsoever.

 

071's clog up easily, normally dead and unsalvagable in most cases. But the bang for buck you can't complain, its a good plug

 

I disagree, I really rate them and I'm only on a group A coil, and my car idles perfect and revs cleanly to 8500rpm.

 

Mine are about 18months old and still work fine

Steve

 

Yeah but how many mile have you done with them?

 

On the road or on the dyno??

 

decided on 071 for the running in period as there cheap and dont matter if they foul as cheap then will go to ngk's

 

About 2500 miles on each

Steve

 

If you dont have a good coil setup at 500bhp then you are stupid, dont blame the choice of plugs because your coil system cant cope . Iridiums of the correct grade at any horsepower & any boost.

 

i cant believe people are saying the 071s dont last long - well they're only a tenner so change them when they need changing

 

I have never had issues with 071 on wasted spark at all but since I've had a new engine I will be leaving that up to the mapper when the time comes but its currently sitting with a new set of 071 in for the running in process

 

Ive always used BCR8ES with no problems, granted not on a 500bhp engine but a 400bhp(ish) motor on greys and T34.63 @ 36psi. Never a missfire or hiccup, the only issue I had was if the car was being started, moved in and out of the garage/drive then turned off, then the same putting it away, it would eventually foul the plugs and it needed them cleaning and chucking in the oven for 10 minutes or bung a new set in at under a fiver (Halfords Trade Card )

 

Denso IK31's are the only plugs I'd buy now.

 

Rod, what's a good coil system for sm4?
Im using a coil pack and have to run a 0.5-0.6mm gap or I get blow out.
Is there a good coilpack I can use or will I need to go coil on plug?

 

071's for me, never had any issues with them at all.

Steve

 

...... BKR9EIX's........fuckn class plug....gapped at .75 faultless (and running 430 bhp )

 

What are peoples views on IK31s ?

 

i ve denso s in my car,
but my mapper changed them for mapping, he said he would nt put them in his lawn mower lol
once it was mapped he put them back in, i ve never had a problem with any plugs i ve ever run,
a mate of mines cossie eats plugs regularly for some reason

 

So he wouldnt put them in his lawn mower but put them back in your engine

 

NGK R7234