what spark plugs are you running?
Nov 15, 2005, 10:16 AM
#16
Evolving Member
iTrader: (7)
Join Date: Jul 2005
Location: Denton Texas
Posts: 465
Likes: 0
Received 0 Likes
on
0 Posts
What gap should NGK BPR7ES be gapped at? When i bought them and checked the gap, they already came gapped at 0.28. So i just installed them in my car and it runs good. But now i wonder if the gap should have been bigger.
Nov 15, 2005, 10:23 AM
#17
autozone put evo in there comp and they didn't havre the ngk 7 iridiums,,,so the next best one they had was a bosch platinum 4,,,misfire bigtime,,,they are not the right size,,,don't work,,,got the 7 iridiums and no problems
Nov 15, 2005, 10:28 AM
#18
Evolving Member
iTrader: (7)
Join Date: Jul 2005
Location: Denton Texas
Posts: 465
Likes: 0
Received 0 Likes
on
0 Posts
Nevermind. I just found the gap size at NGK's website. Its suppost to be 0.32. I probably lost power for undergapping. My plugs are probably 1 month old. Do you guys think i can pull them out and regap them and put them back in?
Nov 15, 2005, 11:11 AM
#22
Evolved Member
iTrader: (41)
Join Date: Sep 2004
Location: Toms River, NJ
Posts: 4,653
Likes: 0
Received 0 Likes
on
0 Posts
I finally swapped out my BPR7EIXs this weekend and got a pair of BPR8ES coppers. They were gapped at 26 out of the box so I left them. My BPR7EIXs came gapped at 29/30, which I thought was kind of high but I just left them!
Nov 15, 2005, 11:21 AM
#23
i got BPR8EIX they came pre-gapped at 28 but i was gettng slight misfire, i have similiar mods to you, so i gapped them down to 25 (yes there iradium so u have to do this super carefully) and now my car runs great with no misfires
Nov 15, 2005, 11:26 AM
#24
Evolved Member
iTrader: (41)
Join Date: Sep 2004
Location: Toms River, NJ
Posts: 4,653
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by thatsMR2u
i got BPR8EIX they came pre-gapped at 28 but i was gettng slight misfire, i have similiar mods to you, so i gapped them down to 25 (yes there iradium so u have to do this super carefully) and now my car runs great with no misfires
Nov 15, 2005, 11:30 AM
#25
Evolved Member
iTrader: (16)
Join Date: Mar 2005
Location: CT
Posts: 1,338
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Soon2BEVO
Yeah I was getting misfires with my BPR7EIXs and sometimes I got the P0300 code while idling..
I started to get the p0300 code a lot during idling with the stock plugs. I have yet to get one with the switch to the coppers.
Nov 15, 2005, 11:33 AM
#26
Originally Posted by dbdude
Nevermind. I just found the gap size at NGK's website. Its suppost to be 0.32. I probably lost power for undergapping. My plugs are probably 1 month old. Do you guys think i can pull them out and regap them and put them back in?
Nov 15, 2005, 11:38 AM
#27
Evolved Member
iTrader: (20)
Join Date: Apr 2005
Location: Chantilly,VA
Posts: 920
Likes: 0
Received 0 Likes
on
0 Posts
dang, this thread makes me experiment with spark plugs. I am using 91 gas which is very prone to the detonation even at 19 psi. Do you guys think that colder spark plugs will help?
Last edited by taenaive; Nov 15, 2005 at 11:40 AM.
Nov 15, 2005, 01:52 PM
#28
Hey guys,
I'm running NGK bpr7es here, gap tightened slightly to ~.026 or so. I went through several months of dealing with a misfire near torque peak (4500 rpm) last winter, which ended up being caused by too much gap and Magnecor plug wires. Tightening the gap with copper plugs and going back to stock plug wires helped me love my car again.
I think that in general, tightening the gap will help if you are experiencing misfire. Too tight may be more prone to detonation or preignition. If you have detonation or preignition, it may help to switch to a colder plug. A colder plug can help keep cylinder temps down, but may be more prone to fouling. Lots of trade-offs, heh.
Iridium plugs are difficult to gap without damaging them. I broke a few when installing my wife's WRX.
Copper is a good conductor, just need to change them more frequently. I've heard to stay away from Platinum for turbo cars, but I'm not sure why, lol. I've always used coppers and iridiums on my Audi A4, WRX, and Evo...
Generally, turbo and other FI cars need a tighter gap because of the high cylinder pressures. If you're ignition is good, running a little more gap may create a better/more efficient burn, but that probably wouldn't apply for us, since it would just misfire or the gain would be insignificant...
Good luck,
FB
I'm running NGK bpr7es here, gap tightened slightly to ~.026 or so. I went through several months of dealing with a misfire near torque peak (4500 rpm) last winter, which ended up being caused by too much gap and Magnecor plug wires. Tightening the gap with copper plugs and going back to stock plug wires helped me love my car again.
I think that in general, tightening the gap will help if you are experiencing misfire. Too tight may be more prone to detonation or preignition. If you have detonation or preignition, it may help to switch to a colder plug. A colder plug can help keep cylinder temps down, but may be more prone to fouling. Lots of trade-offs, heh.
Iridium plugs are difficult to gap without damaging them. I broke a few when installing my wife's WRX.
Copper is a good conductor, just need to change them more frequently. I've heard to stay away from Platinum for turbo cars, but I'm not sure why, lol. I've always used coppers and iridiums on my Audi A4, WRX, and Evo...Generally, turbo and other FI cars need a tighter gap because of the high cylinder pressures. If you're ignition is good, running a little more gap may create a better/more efficient burn, but that probably wouldn't apply for us, since it would just misfire or the gain would be insignificant...
Good luck,
FB
Nov 15, 2005, 01:57 PM
#29
Evolved Member
iTrader: (9)
Join Date: Sep 2003
Location: Ft. Lauderdale
Posts: 6,197
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Warrtalon
I would suggest staying in the same heat range (7) with those mods. Go get some Copper NGK BPR7ES or Iridium NGK BPR7EIX. If you were running alky and 23-24psi daily, then I'd suggest you get some 8s (BPR8ES/BPR8EIX), but I don't think you need those right now and will run better on the 7s.
