Best plugs for blown application?

LaserSVT · Apr 15, 2010

Alright boys and girls. I am getting closer to blower install time and need to get plugs. I have always just bought the copper version of whatever was supposed to be for my year/model car but realize with boost I may need a different heat range and such.

So this is for a 4V 4.6 running a Kenne Bell 2.2L non-intercooled blower with boost at 8-9lbs. I am open to suggestions.

Midnight2V · Apr 15, 2010

I run autolite 103's. But my heads are fully threaded. if you have half height threaded heads, which unless your heads are 2004+ 4v they are half height. Use copper and 2 stages colder than stock for anything more than 10#'s

LaserSVT · Apr 15, 2010

Still have 98 B heads on it. Now I have to find numbers. If I tell the people at the local parts place "Two heat ranges colder" I will just get a blank stare.

sneaky98gt · Apr 15, 2010

I know most people will recommend the NGK TR6s, which are copper and two stages colder than stock, for higher boost levels. I am running NGK TR55s, which are platinum and 1 step colder than stock, on 7-8(on a good cold night) pounds of boost with no problems.

KBExperience · Apr 15, 2010

Laser, by local parts place I'm assuming you're talking about autozone? If so I know what you mean.. 99 % of the people that work for them don't know a damn thing about cars

sneaky98gt · Apr 15, 2010

LaserSVT said:
Still have 98 B heads on it. Now I have to find numbers. If I tell the people at the local parts place "Two heat ranges colder" I will just get a blank stare.

Yup. I know exactly what you mean. My tuner was the one that set me straight on the plugs, and he said that the TR55s are fine for "lower boost levels", whatever that exactly means, and I know tons of people say TR6s for higher boost levels. When I finally made up my mind on the TR55s, and went to Advance to buy them, the guy goes, "NGK? You know you aren't supposed to use them on an American car right? Only Japanese cars." I said, "Well, my tuner, who has a 1500 horsepower 8 second street car, says you can." He turned around and went and got the plugs for me.

LaserSVT · Apr 15, 2010

Cant use them on American cars huh? I hate auto parts stores.

Well crud. Now I dont know if I should go 1 or 2 steps colder then.

9646gt · Apr 15, 2010

i thouht tr6 was one stage colder. That's what the computer at the parts store said at least. List from moddedmustangs.com:

Credit given to ALLMTR2V on the corral forums.

MOTORCRAFT
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Hea range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

NGK
TR-55/ 3951/ Stock Heat Range
TR-6/ 4177/ 1 Step Colder
BP7EFS (PN - 3526) BR7EF (PN - 3346) two steps
R5724-8 (PN - 7317) two and a half steps
R5724-9 (PN - 7891) three steps
R5724-10 (PN - 7993) four steps

AUTOLITE
764s / Stock
103s / 1 heat range cooler
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler

CHAMPION
YS-59C / -3 or -4 below stock heat range

DENSO
IT16 / stock heat
IT20 / -1 heat range
IT22 / -2 heat range
IT24 / -3 heat range
__________________
White99stang-

I am running tr6 in my blown 01 and they are great. Gapped them at 0.35. When I has Stock heat range Autolite coppers gapped at 0.54 the car had alot of spark blowout and would run horrible at WOT under boost.

LaserSVT · Apr 15, 2010

So at 8-9 lbs and no intercooler should I run two steps or one step cooler?

9646gt · Apr 15, 2010

LaserSVT said:
So at 8-9 lbs and no intercooler should I run two steps or one step cooler?

I run 8-9 pounds non intercooled and the tr6 from ngk works great as stated. Make sure and run a smaller gap as well. Around .35 or a little smaller should be good.

Mr. Rustypwnz · Apr 15, 2010

ive found that 764's gapped at .030 work well at about 12psi range on a buddys car, it was around 420rwhp as well

Kilgore Trout · Apr 16, 2010

You should run a colder plug with forced induction however there is no need to go with anything other than copper unless you want to be able to leave the plugs in for years which is stupid anyways. Go with copper, replace annually. You will also have to close the gap, I run mine at .032

DO NOT use Bosch or Denso plugs.

bakos24 · Apr 16, 2010

I'm using the TR6s with no problems. Now get that blower on!

SVT32VDOHC · Apr 16, 2010

I ran NGK TR6's in my 95GT with 13lbs. I had Motorcraft plugs (2 rangers colder) in it before and it ran about the same with both plugs. I didn't notice any difference.

Will that KB fit under a stock Mark hood?

LaserSVT · Apr 16, 2010

I hope it fits under the hood. So far all the guys I know running a KB on a second gen Mark VIII have been able to fit them in. Its the first gen guys that need a cowl hood.

SVT32VDOHC · Apr 16, 2010

LaserSVT said:
I hope it fits under the hood. So far all the guys I know running a KB on a second gen Mark VIII have been able to fit them in. Its the first gen guys that need a cowl hood.

Where did you find such a nice Mark? The ones I get in here for parts and even the ones on the road still are ratty POS's. I had two nicer cash 4 clunkers Mark's come in here, but the others I've had throughout the years were rats.

LaserSVT · Apr 16, 2010

SVT32VDOHC said:
Where did you find such a nice Mark? The ones I get in here for parts and even the ones on the road still are ratty POS's. I had two nicer cash 4 clunkers Mark's come in here, but the others I've had throughout the years were rats.

I searched long and hard to find this one. Shopped for about, i dunno, maybe 6 hours total.

They are all over out here in nice shape. This one was a one owner car and fairly low miles though. I have done my fair share to it. Lets see if I can remember.

Replaced every front end suspension component ie: UCAs, LCAs, Links, Air struts and strut rod bushings
Then:
Cobra brake kit with custom drilled rotors and custom painted calipers
Addco 1.25" sway bars front and back
SCP k-member brace, front suspension brace and rear LCA IRS brace
Poly bushings throughout
Sensor lowered
ASHAM8 suspension computer that allows infinite controll of ride height and spring rate from drivers seat
Magnaflow resonated x-pipe
Borla Pro XS 2.5" mandrel bent exhaust with custom tips
Xcal with all the software and a few custom tunes
1- piece aluminum driveshaft
Cobra Trac Lok rebuilt with 4 clutches
3.73 gears
255 lph pump
Saleen 18" Speedstars with custom center caps. These were the very first Saleens ever made for a Mark and are the prototypes.
Pioneer AVIC Z3 DVD/NAV with JL Audio slash series amp, Boston Pro Components and Boston G5 sub

Going on soon:
KB 2.2L blower
39lb injectors
Lightning MAF meter
Cobra intake pipes
CAI
J-mod

Also sometime this Summer I hope to have it repainted as the car had a dent in it I had fixed but am very unhappy with the color match behind the passenger door. Plus the front and rear bumpers have been repainted.

1990Coupe · Apr 16, 2010

I have to say laser.. you have one of the nicest marks i've ever seen. When you parted the green one i thought that was a mistake but boy was I wrong. I love it. When i go and look at marks in stock form they do nothing for me, but yours is just sex man.

GDawg · Apr 16, 2010

Nice Mark VIII!

I run NGK TR-6 plugs.

LaserSVT · Apr 16, 2010

Thanks all.

Best plugs for blown application?

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