New Plugs: At what level do you go one step colder? - Miata Turbo Forum - Boost cars, acquire cats.

Go Back  Miata Turbo Forum - Boost cars, acquire cats. > Performance & Tuning > Engine Performance
Reload this Page >

New Plugs: At what level do you go one step colder?

Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

New Plugs: At what level do you go one step colder?

Old 03-31-2010, 12:14 AM
  #1  
Senior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2009
Posts: 1,467
Total Cats: 62
Default New Plugs: At what level do you go one step colder?

What threshold do you guys use for determining when to go to colder spark plugs?
Enginerd is offline  
Old 03-31-2010, 02:06 AM
  #2  
Senior Member
iTrader: (4)
 
Join Date: Jan 2008
Location: Falls Church, VA
Posts: 1,361
Total Cats: 16
Default

Conceptually, you want plugs cold enough to prevent preignition but hot enough to not foul.

I would say for most of us the threshold is whether you're running forced induction or not. Most of the boosted folk run BKR7Es which are two steps colder than stock.

I am currently n/a but the car gets tracked so I went one range colder than stock with BKR6Es for a little extra protection against preignition. They run fine with no fouling issues.
ScottFW is offline  
Old 04-01-2010, 12:43 PM
  #3  
Junior Member
iTrader: (5)
 
Join Date: Jan 2009
Location: CT
Posts: 271
Total Cats: 0
Default

I ran the 7's at the 230hp mark. Ill go 8's at 400+ mark but only with nitrous. If your staying boost only I'd say bkr7es's should work great with what ever your stock internal engine can handle, even up to 400hp. FYI I had a ***** hard time finding the 7's. 8's were ever worse.
FastColt is offline  
Old 04-01-2010, 01:12 PM
  #4  
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,760
Total Cats: 35
Default

As soon as I turned the boost up to 10psi on my Greddy kit, I had to go to 7s.

I thought the 7s were only 1 step colder than stock.
Bryce is offline  
Old 04-01-2010, 01:27 PM
  #5  
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,258
Total Cats: 26
Default

I've always run 6s, and thought they were stock.

I also though going up a number was colder...but can hardly find 7s.
gospeed81 is offline  
Old 04-01-2010, 01:41 PM
  #6  
Elite Member
iTrader: (30)
 
levnubhin's Avatar
 
Join Date: Aug 2007
Location: Va Beach
Posts: 7,292
Total Cats: 2
Default

Originally Posted by gospeed81 View Post
I've always run 6s, and thought they were stock.

I also though going up a number was colder...but can hardly find 7s.

Napa
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
levnubhin is offline  
Old 04-01-2010, 01:50 PM
  #7  
Senior Member
iTrader: (6)
 
tyson87's Avatar
 
Join Date: Aug 2008
Location: West Palm Beach, FL
Posts: 1,020
Total Cats: 1
Default

they are the same as the integra type r
tyson87 is offline  
Old 04-01-2010, 02:33 PM
  #8  
Elite Member
iTrader: (33)
 
RotorNutFD3S's Avatar
 
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,518
Total Cats: 30
Default

BKR5E-11s are stock. If you go for a trip with long durations of cruising and have 7s, take them out and throw in a set of 6s, the 7s like to foul during long cruises.

Last edited by RotorNutFD3S; 04-01-2010 at 02:43 PM.
RotorNutFD3S is offline  
Old 04-01-2010, 02:40 PM
  #9  
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,258
Total Cats: 26
Default

Originally Posted by RotorNutFD3S View Post
BKR5E-11 are stock. If you go for a trip with long durations of cruising and have 7s, take them out and throw in a set of 6s, the 7s like to foul during long cruises.
In that case I'm running the right plug then. One step colder than stock, and good for my daily 150mile round trip.
gospeed81 is offline  
Old 04-01-2010, 05:08 PM
  #10  
Junior Member
iTrader: (5)
 
Join Date: Jan 2009
Location: CT
Posts: 271
Total Cats: 0
Default

Originally Posted by RotorNutFD3S View Post
BKR5E-11s are stock. If you go for a trip with long durations of cruising and have 7s, take them out and throw in a set of 6s, the 7s like to foul during long cruises.
Stock for 95 maybe, I believe 6's are stock heat range for the. 1.6
FastColt is offline  
Old 04-06-2010, 09:16 PM
  #11  
Junior Member
iTrader: (3)
 
Join Date: Jun 2008
Location: NJ
Posts: 428
Total Cats: 0
Default

Originally Posted by FastColt View Post
Stock for 95 maybe, I believe 6's are stock heat range for the. 1.6
That's the consensus... 1.6s use 6 stock, one colder is 7. 1.8s come with 5 stock.
ctxspy is offline  
Old 04-13-2010, 01:29 AM
  #12  
Senior Member
iTrader: (2)
 
Join Date: Oct 2007
Location: Northeastern CT
Posts: 546
Total Cats: 2
Default

oddly enough, the 1.8 BP in the escort GT/protege came with 6's stock.

i run 7's. BKR7E, part number 4644. advance auto stocks tons of them.
therieldeal is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Frank_and_Beans
Supercharger Discussion
13
09-12-2016 09:17 PM
tazswing
Race Prep
9
10-01-2015 01:33 AM
Joe Perez
Current Events, News, Politics
8
09-30-2015 05:41 PM
Lincoln Logs
Dynos and timesheets
4
09-23-2015 01:26 PM
Motorsport-Electronics
ECUs and Tuning
0
09-05-2015 09:02 AM


Thread Tools
Search this Thread
Quick Reply: New Plugs: At what level do you go one step colder?


Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.