NGK Iridiums: BCPR7EIX or BCPR7EIX-11??

[Red Dragon]

Hey everyone,

After spending nearly the entire day trying to chose a spark plug for my 91T, running 1.1bar, I decided to give the NGK iridiums a try, and one step colder than stock (hence 7 instead of 6)

Question is, do I want the "-11" version, which from what I understand has something to do with the gap, but I don't know what.

Also, I decided to grab the standard NGK blue plug wires to hook them up?

Thanks everyone

 

[Red Dragon]

I guess I should add that I am the new owner of Rob Carlile's 91T that many of you may have seen on his website, especially his write up of the Lexus/Reimer AFM upgrade. This is my third supra, second turbo, and first one modded by someone other than me, so its taking some time to get used to it, and my first attempt to go other than factory rec on spark plugs...

I sold my last supra 4 years ago, hence the single post and registration today, but I have been involved in SOGI and the like in the past.

Thanks again

p.s. I have seen many ppl swear by the autolites, but somehow I jsut can't entertain the idea of using parts bought at walmart in this car.. not a snob thing, just a reliability type thing, and paying $50 for spark plugs every oil change (car will be a garage queen, so limited) isn't a big deal to me to know I put the "good stuff" in.

thanks for any suggestions

 

[Reign_Maker]

you know I actually found an old package for an NGK iridium spark plug from my last supra, and saved it because it has the part number on it, because when I went to get some iridiums they said they didnt have ones for my motor, so now I have the part number and I can just order it off the number... HOWEVER, I dont have the box here, its at my shop... I can let you know tomorrow, but Im sure someone will answer now, lol...

 

[Red Dragon]

Thanks, I would appreciate it if no one else has an answer. I guess the main source of confusion comes from suprasport.com, where they sell the 5 step iridium plug with the "-11" and the 6 step plug w/o the "-11" designation. I thought this was perhaps due to NA/Turbo differences, but suprasport.com lists both plugs for the 7MGTE??

I thought that 6 was stock for turbo and 5 stock for N/A, is this right. If so, perhaps that explains the difference, and perhaps suprasport simply made an error when listing the 5 step plug for the 7MGTE instead of the 7MGE??

Thanks again everyone, I'm looking forward to getting back into the supra scene. I have already put the elbow grease into cleaning the badboy inside and out, top to bottom(probably 75 man hours already) and restoring the red paint (looks GREAT now after using the Sonus three step refinishing polishes and pads from bettercarcare.com) Now I'm ready to start tackling the engine by changing all the fliuds to redline, plugs and plug wires and then go from there...

 

[isnms]

for my 91turbo:
these are the ones I put in BCPR6EIX $6.95ea .028gap
they also have the BCPR7EIX $6.95ea .028gap
and the BCPR7EIX-11 $6.95ea .040gap

NGK product finder
◊6 ~ 91 Toyota Supra Turbo
◊7 ~ 91 Saab 900 Turbo
◊7-11 ~ 98 Saab 900 SE Turbo

i know it doesn't really answer your question, but i put the 6's in.
edit:yes the 6's are the stock size
____________________________________
edit: 9/29/6

NGK Spark Plugs - Part Finder www.ngksparkplugs.com
Prices @ www.apwonline.com

Standard

*stock
1988 SAAB 9000 2 L4 B202L FI Turbo; Plugs - City Drivi
Standard BCPR6ES 2330 0.028 $1.80 ea.
*1 stage colder
1988 SAAB 9000 2 L4 B202L FI Turbo; Plugs - Hard Drivi
Standard BCPR7ES 3330 0.028 $1.80 ea.​

Iridium

*stock
1991 SAAB 900 2 L4 B202L FI Turbo; Plugs - City Drivi
Iridium IX BCPR6EIX 5689 0.028 $5.84 ea.
*1 stage colder
1991 SAAB 900 2 L4 B202L FI Turbo; Plugs - Hard Drivi
Iridium IX BCPR7EIX 5690 0.028 $5.84 ea.​

spec: 14mm, 3/4" reach, 5/8" hex, JIS height

 

[CPT Furious]

If you go to NGK's webiste, the -11 just has to do with the gap. I believe that's the gap designation for the N/A with the turbo being a -8. I'm not sure what the gap is without the desingator, but I'd be REAL careful setting the gap with a .4mm electrode!

 

[Red Dragon]

I think this answers my question: I obviously don't want a .40 plug gap, so I'm gonna go with the .28 gap even though stock is I believe .031 or .032 right? As these iridium cannot realistically be regapped, I'll just go with the .028 (and hope they are all actually gapped to that out of the box after checking them)

Thanks everyone. If anyone has come up with a good way to gap these iridium plugs, let me know, otherwise I'll just stick with .028 and see how it goes, as I was planning on gaping them a little closer than stock anyway.

p.s. How did you find the plug gaps? I didn't see them on either the NGK site or the links you have...

 

[isnms]

yeah, don't regap iridium.

finding the gaps was tricky.
first i searched the plug number on sparkplugs.com and checked the application list
then i used the NGK product finder and inputted the vehicle from the application list and that returned the plug info with the gap

 

[gixxer750]

just remember, NGK's heat range numbering system is backward...

5-hotter
6 med
7 colder.....