Need help with plugs for supercharged 03 gt

y0rascal · Jul 7, 2007

hey guys i recently installed a eaton style/saleen supercharger on my 2003 mustang gt and i am still using the stock plugs...

i am wondering which plugs should i upgrade to for my application???

just want to get some insight just running it over 4.5k rpms it starts to ping i am going to do a full tune up just need to know what plugs are recomended...

thanks for the help in advance..

Dirty_D · Jul 7, 2007

How much boost are you running....Are your plugs gapped right? Also, what kind of tune do you have? Pinging is not good. Maybe running lean at higher rpm's. I talked to ford about replacing stock plugs with cooler ones but they told me that is not required unless your running major boost. What kind of gas are you using?

Blinkstang · Jul 7, 2007

I have a pullied Series II and I am running NGK-TR6's gapped at around .028

Kilgore Trout · Jul 7, 2007

Blinkstang said:
NGK-TR6's gapped at around .028

Sounds ideal just go with that again when you replace them. Those are copper plugs so they wear out pretty quick. My guess is that it is time to replace them and that is the cause of the ping.

Scorcher2005 · Jul 7, 2007

Kilgore, Blinkstang was not the original poster and is not replacing his plugs...

But to yorascal, most do run the NGK TR6 plugs. They are one heat range colder. And i dont believe that one step colder plugs are only required for major boost. Although with more boost wou may need a few heat ranges colder.

saleen556 · Jul 7, 2007

How much boost are you running? Even when mine was stock it would ping when I got up above 5000 rpms. Problem went away after upgrading the fuel pump and got it a dynotune.

y0rascal · Jul 8, 2007

sorry for being so vauge...

well his stang was involved in an accident and he put it back together... he had 89 octane gas but added octane booster to help it out he does know that it should be 93 its just thats the gas that he had when he was in the accident...

right now he has the saleen tune... he had them do the computer reflash.. because his stang is a daily driver he needs a real conservative tune....

from the boost gauge i saw 5-7 lbs a about 4k rpms when i drove it, but my brother stated he had seen 10lbs of boost when he went all the way to 5k rpms... so that is what we are looking at...

he was thinking bout getting the stock cobra plugs since they withstand the boost on the cobras, but who knows...

he still has the stock plugs and is going to change them and i posted on here for suggestions... now is he going to need the ngk#6 plugs with the 1 heat range colder? we live in florida if that helps... but we know after we do a full tune up chnge the plugs and get some 93 octane in it ... hopefully it wont ping... so keep the suggestions coming on what plugs to get.. thanks..

Gearbanger 101 · Jul 8, 2007

I've got an Allen Engine Development kit that also uses an M90. I'm pullied and it peeks about 10psi in good air (before dropping off to about 7-8psi at the top of the tach IE....I need a bigger blower). I'm running a set of Ford Motorcraft AWSFA-12C's with mine (Copper plugs, two steps colder than stock) and they're gapped at about .038" Copper plugs burn the cleanest, but you should be changing them about every 7-10K since they wear out so quickly with those kinds of cylinder pressures/temperatures. Either way....blower cars should be no less than 2 heat ranges colder, not one.

....I'm also running a Kenne Bell boost-a-spark though, which is probably why I'm not seeing any misfires at the top end under hard acceleration, so you might want to keep yours between .028"-.033" if you're running without one.

y0rascal · Jul 8, 2007

i also forgot to mention the fuel pressure is between 40 and when you step on the pedal it climbs to 50 psi... is this ok?

Gearbanger 101 · Jul 8, 2007

Yup...it's when the fuel pressure drops under load is when you've got a problem. Your car has a return less fuels system, which consists of a sensor on the fuel rail. When the need for additional fuel arises (under boost), the sensor sends a signal to the computer telling it to increases the fuel pressure to the rail.

y0rascal · Jul 8, 2007

what did you dyno with your m90 i am looking for a ball park figure???

so baiscally ngk's #7 which is 2 steps colder than stocks?

Blinkstang · Jul 8, 2007

If you look over on the Saleen section of Stangnet you will find that a lot of the guys are running the TR-6's. LINK LINK LINK LINK

My plugs along with my gap were recommended to me by my tuner. But I also have a number of other modifications done to my Series II.

Gearbanger 101 · Jul 8, 2007

y0rascal said:
what did you dyno with your m90 i am looking for a ball park figure???

so baiscally ngk's #7 which is 2 steps colder than stocks?

Funny you should ask.....I'll let you know Tomorrow night. I'm heading to the dyno in the afternoon to find out what she'll put down. I'm anticipating about 350rwhp though. My car has a lot of drivetrain loss and the M90 is still a pretty small blower for our cars.

Kilgore Trout · Jul 8, 2007

Scorcher2005 said:
Kilgore, Blinkstang was not the original poster and is not replacing his plugs...

Wow, you are right man... WTF was I drinking last night...

I am running AGSF12-FM1 which are very cold platinum plugs gapped at .032

y0rascal · Jul 8, 2007

y0rascal said:
hey guys i recently installed a eaton style/saleen supercharger on my 2003 mustang gt and i am still using the stock plugs...

i am wondering which plugs should i upgrade to for my application???

just want to get some insight just running it over 4.5k rpms it starts to ping i am going to do a full tune up just need to know what plugs are recomended...

thanks for the help in advance..

thanks a lot i posted the thread there to see if i could get more advice thanks guys....

y0rascal · Jul 9, 2007

Gearbanger 101 said:
Funny you should ask.....I'll let you know Tomorrow night. I'm heading to the dyno in the afternoon to find out what she'll put down. I'm anticipating about 350rwhp though. My car has a lot of drivetrain loss and the M90 is still a pretty small blower for our cars.

so any news on your new numbers?

Gearbanger 101 · Jul 9, 2007

y0rascal said:
so any news on your new numbers?

Yup...bad I'm afraid.

Turns out my 190lph and KB BAP wasn't supplying enough fuel for my combo and I ran out at about 4,800RPM. So, all I was really able to put down after a few test hot laps was a base full throttle pull of 308RWHP & 377RWTQ

I just picked up a 255lph unit to replace the 190lph with, but they're booked solid right now and not going to have time to dyno me again until this upcoming Saturday. Kinda sucks, since I drove 4 1/2 hours to get there, but that's life I guess. All was not lost though. I picked up a good bit of throttle response and low end torque and really improved the drivability with what he was able to accomplish. It turns out I was thinking with half a brain when I set my fuel pressure and set it to 39lbs.......with the vacuum line on, instead of off. So I was actually seeing something like 53lbs when it was on. Kinda made for a dirty idle and piss poor starting and drivability....not to mention if fouled a set of brand new plugs in about 2,000km.

So, in the mean time, I'm gonna swap out the pump to take care of the fuel issue, fill her up with '94 octane and ice water in the intercooler and try her out at an upcoming track even on the Friday night before to see what kind of times I'm able to get.

y0rascal · Jul 10, 2007

ok he went to Bennett auto supply and asked the the ngk tr6 iriduim spark plugs and they guy had to order them but he got them at $1.97 a piece.... now my question is are these the required spark plugs or are they the ix series?

i see guys just posting tr6's if he will be fine with the regular tr6 then lemme know so he will not have to worry so much...

and after talking with him he advised he was playing with his car a lil bit and was able to see the the pinging was at about 3k rpms full throttle and as he goes high it goes away.. we are thinking spark plug/gas issue since he has the 89 octane with octane booster...

so i need an answer on the spark plugs if regular tr6's are fine or if he needs the tr6's ix which are like $7.00 a plug... thanks guys

y0rascal · Jul 10, 2007

Gearbanger 101 said:
Yup...bad I'm afraid.

Turns out my 190lph and KB BAP wasn't supplying enough fuel for my combo and I ran out at about 4,800RPM. So, all I was really able to put down after a few test hot laps was a base full throttle pull of 308RWHP & 377RWTQ

I just picked up a 255lph unit to replace the 190lph with, but they're booked solid right now and not going to have time to dyno me again until this upcoming Saturday. Kinda sucks, since I drove 4 1/2 hours to get there, but that's life I guess. All was not lost though. I picked up a good bit of throttle response and low end torque and really improved the drivebility with what he was able to accomplish. It turns out I was thinking with half a brain when I set my fuel pressure and set it to 39lbs.......with the vacuum line on, instead of off. So I was actually seeing something like 53lbs when it was on. Kinda made for a dirty idle and piss poor starting and drivebility....not to mention if fouled a set of brand new plugs in about 2,000km.

So, in the mean time, I'm gonna swap out the pump to take care of the fuel issue, fill her up with '94 octane and ice water in the inter cooler and try her out at an upcoming track even on the Friday night before to see what kind of times I'm able to get.

definitely keep me posted i told him about your numbers and he loved your trq number. what are your mods on your car as you dyno'ed with?

definitely post up the new results... thanks....

Kilgore Trout · Jul 10, 2007

For a supercharged application the TR6IX fine electrode plugs will be the better choice. But the TR6 would be fine if you want to save money.

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