I was looking through some old posts at the different types of spark plugs being recommended. So I went to Mazdatrix and noticed that they have leading and trailing plugs listed seperately. I was under the impression that they were all the same, so could I order all 9's and use them around, or do I have to get two leading and two trailing (I didn't even see 9's listed for leading) Thanks guys

 

www.mazdatrix.com

Order the trailing and the leading in the 9's

 

Maybe I was being vague when I said "I didn't even see 9's listed for leading", but what I really meant was that Mazdatrix's Price List does not list a part number, price, or even a line on the price list for the BUR9EQ with a description of "lead".

I saw that the BR9EV didn't mention a difference between leading and trailing, but from the looks of the list, the BUR9EQ is only available with the hotter leading and cooler trailing temps. Any one else have any ideas of what the difference is, or which I should order if I want them to fit.... and if you've got info, please be a little more specific. Thanks

 

BUR9EQ is the stock trailing plug, BUR7EQ is the stock leading. they are the exact same size. the only differecnce is the heat rating. if you have a stock turbo car or any N/A. use the stock ratings. if you have a modded turbo get 4 BUR9EQs (4 trailing plugs) and put them in all 4 spots.

 

can I use 4 BUR9EQ if I only have a light modify turbo II?

 

Mine' lightly modded too, with just Exhaust and FCD, but I figured that the 9's couldn't really hurt anything, however, too much boost on a colder plug might cause problems, so i figured I'd go with the 9's.

 

RestoTII,

The 9's are cold, the 7's are 2 heat ranges hotter.

Irv, Keith's dad

 

now im confused, 9s are trailing which are colder, and 7s are leading which are 2 heat ranges hotter, but you should use 4 trailings but too cold is bad...
that second to last post lost me.

 

9s are colder than the 7s, 11s are even colder, 12s even more, and 13,5s are the coldest (brrrrrrr ). In Greece I cannt even find 7s, so I have 9s all around. The difference between 7s and 9s is almost negligible in low rpms, but significant in high rpm. You can upgrade to 9s even if you have BPU (you know, intake, exhaust, etc). Its really nothing too serious.
This is also easier, cause you dont have to distinguish between the two heat marks. Just order 4 9s and you're set....

 

Run all 9's - you really won't feel the difference unless all you do is stop-and-go driving in traffic!

This makes it easy to buy and install, since you can't mess up the installation.




-Ted

 

Yeah, seems like I got the two confused in the post, but I meant I didn't want to rn Hotter plugs, figured colder were safer

 

I have been using the stock leading and trailing plugs in my 88 T2 since I got it 2 years ago.

I don't believe that my car has been modified, but my car chews up the leading plugs (the 7EQ's ) in only 10k miles. The trailing ones always look pretty good (the 9EQ's), the center electrodes still look good and the sides still look good. The leading ones though, always have a large amount of the center electrode eaten away, and the even the sides look worn away a bit. The leading plugs also seem to always have a lot more carbon built up on them than the trailing ones.

So, does it sound like a good idea to go with all 9s or is there a reason why I should stick with the 7s on the leading side and keep replacing them every 10 thousand miles?

Also, does anyone know what the average life of spark plugs on the second gen turbos are?

Thanks,
Douglas

88 Turbo II
Melbourne, FL