Sorry if this has been discussed before, i did search and nothing of use came up, so here it goes:

What kind of spark plugs should i be running?

Car has a street port, pfc, large single turbo, 550/1600 injectors, and all the other bolt ons. Any help is greatly appreciated.





~Sirrelix

I run 4 x B10EGV plugs. You'd have to get a socket that has been slimmed down but the plugs have worked great so far. Also these are cheaper than the 9's.



Either run those or go with what most people get, 4 x BUR9EQP's.

what brand are the b10egv's?

They are NGK's also.

whats the diff then?

These are like regular spark plugs (they have the litte electrode thingy that you have to set the gap on)



The only difference I really noticed was the cost. They are cheaper and easier to get.

Any suggestions on a good place to get them from?



-Thanks





~Sirrelix

Advanced Auto Parts sells them

Thanks! - What is the advantage of the 10's over the 9's? should all 4 be the same? Thanks abunch for the info!



~Sirrelix

From SPOautos:



"The majority of people I see running 10's and 11's are single turbo guys. The only people I ever see running 10's on a twins car are guys running around 15+psi of boost. I would run 10's on anything over 15psi to be safe. I've put many many miles on 10's with no problems at all. If you have a decent ignition amp they will stay nice and clean.



Just because Mazda ran 7's and 9's doesnt mean anything. That desicion was based on around 10psi of boost and 215ish rwhp. As you increase the hp you increase the combustion btu's and need to run colder plugs. I typically ran 9's from 12-15psi, then 10's from 15 or 16+.



On a side note, I run b10egv plugs (heat range 10)which you gap. I run a low gap of about .022 with them.



I'm sure there are some people on the forum that run a plug colder than they really need to, however if thier car is tuned and will idle good without fouling the plugs then it doest hurt anything. They are only making it more safe, nothing in the world wrong with that. I would VERY much rather run a plug too cold than too hot. That said, there are MANY MANY people on this forum running 10's and 11's because they need them...not just because they are paranoid.



Stephen"

Would i need an upgraded ignition to run those plugs (b10egv)? Is it recommended to get new plug wires aswell? Thanks again for the info!



~Sirrelix

You said you had a street port, pfc, large single turbo, 550/1600 injectors, and all the other bolt ons



I took the "all the other bolts ons" to include an ignition amp. I run one for added safety. What kind of boost are you running? Do you have ignition break up at higher rpms? What plug wires are you running? I run taylor plug wires, they were like 35 bucks. Stock are probably fine but I'd replace them with something if they are old and/or have high milage.

a few of the things i think i have left to upgrade are pulleys and ignition stuff. I have stock plug wires atm, but when i change plugs i plan on getting new wires. Im thinking of getting the NGK plug wires, any opinions on them? Are there any differences between the makes of plug wires at all??? Right now im running .5 bar, once all tuned and done i want my high boost to be 1 bar. Hmmm.... define ignition breakup? My current issue only happens in here in reno, nv - not at sear level (in Ca) It has a slight hesitation at once i get into boost, if not full throttle. It seems very strange. So would there be a big difference between the 9's/10's???





~Sirrelix

I can't comment on the difference between 9's and 10's. I was running 9's before I got tuned. Also I just had a new engine put in. I switched to 10's just before pulling on the dyno. I've been happy so far and I don't have any plans to switch back. Either one should be ok if you are going to stay at 15psi or below.



As far as needed an ingition amp, you might want to try new plugs and wires first. Maybe then check the grounds on the car. After that if you still have a little shudder at higher rpms then I'd get an ignition amp. I bought my HKS twin power before I started running above 10psi. I just wanted to be over prepared... I've not had any other plug wires than the taylors so I'm not too sure on which is best. I've been happy with mine so far but it's probably just whatever you like the best.

Thanks for the info. Im going to try the 10s i believe, as it seems that bigger is better in the case w/ the single turbo. I will find out about the ignition amp when i go to get tuned. Yea, my high boost will definitally be under 15 psi. Any idea on the sizes of the plug wires your running? Does a mm here or there make a big difference?





~Sirrelix

My plug wires are 8mm. I bought them from summit racing for under $40 if I remember correctly.



Remember you'll have to have the tip of the spark plug socket cut down to get the 10's in the housing. Here is a picture of one:

http://www.kgparts.com/images/random/socket.jpg

So 8mm would be more then enough for 10's? hmmm.... where would i go to get a socket cut down, or better ? - where could i get a socket pre cut down ??? Thanks again!!!



~Sirrelix

KGparts.com

click on the DIY link and you can order one from him.



Yeah, my 8mm wires have been good enough for me. Thankfully I have no issues at all with anything (knock on wood).

.022 gap? is that the rule of thumb? I cut down my own socket. It was a decent craftsman socket. It's garbage now, the chinese factory contracted by craftsman didn't cut the hex on centre, so when I cut down the socket one side of the wall is paper thin... and the other is thick. And this was the only awy to get it to fit. Then i broke the socket. if you are going to cut it down on a lathe, get a nice expensive socket, not made in taiwan/china craftsman tools. Lately i've noticed craftsman tools with made in taiwan sticker on them. i"ve replaced one of my phillips made in taiwan screw drivers 5 times now because the head is too soft and easily gets damaged.



done rant.