Which Spark Plug To Use?

[rjdavis21]

Im changing my plugs in my car to hopefully get rid of my bucking under hard acceleration(as I read on other posts with my problem this should fix this) and I need to know what plugs and what gap to go with. I was told the NGK BPR7ES with a .030 gap? Please anyone chime in with some advice...Im hoping to pick them up tomorrow and the sooner the better. Thanks!

 

[Defiant]

BPR6ES at .028 until you've done a lot to your engine.

 

[rjdavis21]

yeh i have done alot to the motor(see profile im running 16g)...please help!!

 

[crankbender]

you may need to go with the 7's and a smaller gap if you are blowing your spark out at high boost.

you might try a .025 gap.

 

[rjdavis21]

ok ive been driving the car for a while after the rebuild and only a few days ago did it start running like it had a small boost leak( studdered under acceleration) so i did a leak test and everythings good. so i though plugs...went to get them and adanced had to order them(got the BPR7ES) so Ill have them tomorrow. well on my way home it gets worse then finially starts to feel as its running on 3 cylinders. idling like that and everything. so im hoping its the plugs. I havent changed the plugs since ive owned the car and ive owned it anout a year...the car burned oil for about 4 months real bad...then rebuilt it totally with new head and for some reason didnt change them still...and after the rebuild and new turbo i still have not tuned because of lack of datalogger so its running rich...so Im assuming they are bad. please no flaming i know i should have changed them I just need some reassurance that this is the problem. im going to tune it in the next two weeks so should i get the plugs and just stay out of boost until the tune? also why do people say not to get the expencive platnum/irridium plugs? are they not good as they say they are? help thanks!

 

[AwdMikey]

The more expensive plugs burn too hot. My understanding is that the reason for getting the NGK BPR7ES is in addition to being a great plug, it burns cooler than the stock plug which works out better for high boost.