53 replies to this topic

[Secondo]

Justin00Stang, on Sep 17 2009, 10:37 PM, said:

I get terrible plug life from my NGK TR6s, about 3000 miles, and then the car will misfire under heavy load like 4th gear at the track. I make more power than most GT500s, but not that much more.

One of the FRPP engineers I know that works on the CJ is using one step colder platinum motorcraft plugs in the new and old CJ, AGSF-12FM1 plugs gapped at 0.035", I'm going to try those next.

If you are only upping the boost to 12-13psi with an upper pulley, IMO, i would not bother to change the plugs. Spark blowout is not an issue, and the DOHC chamber does not need a really cold plug. The FRPP TVS kit raises boost to 13psi and they don't require changing plugs.

Changing the plugs to one step colder for the increased overall HP (around 130 net) from a Stage 2 is cheap insurance. And they're only 2 bucks each! And if you only get 3000 miles from them, what do you expect? They're only 2 bucks each!

[Secondo]

Dennis70Mach, on Sep 18 2009, 06:08 PM, said:

Great write up!! I am going to be changing the plugs on my son's car before we take it to the track. We have the TVS, but I am going to be putting the stock plugs back in. A few questions. What are the stock plugs and I am assuming that you can simply get them through Ford? What is the gap on the stock plugs? What is the torque specs for installing the new plugs? Appreciate the info!

Motorcraft part# SP-405 for the kit of 8, Yes, .044, 10-15ft-lbs.

[Grabber]

This is a great thread that got lost.

It took me a bit to find it for a friend.

Just made it a sticky.

Edited by Grabber, 15 April 2011 - 03:50 PM.

[Hans]

Funny that this appeared today as my car got new plugs installed and a fuel filter this moring. I went with the NGK TR6 at .32 My car now has 25,000 miles and is five years old. We were trying to find out my my inter cooler was burping coolant. so we also had it on the dyno trying to make it hot, well it would not burp any coolant. I was going to install a new pump. but instead I lowers the fluid inn the tank and installed a new cap. It made 547 RWHP and 520 Torque So I now have a new inter cooler pump for sale.

[Tob]

Hans, can you post up some shots of your old pump? I just purchased a Lightning pump, which I'm told is the same one.

When I get home I'll get the closeups I took of the new pump. They clearly show the Bosch part #, the connector, etc. I think I paid $95 at Buyfordracing.

Tob

[Hans]

Tob, on 21 April 2011 - 02:19 AM, said:

Hans, can you post up some shots of your old pump? I just purchased a Lightning pump, which I'm told is the same one.

When I get home I'll get the closeups I took of the new pump. They clearly show the Bosch part #, the connector, etc. I think I paid $95 at Buyfordracing.

Tob

Yes they are the same pump, I pd $88.00 but had shipping costs of $13.00. I have that new pump for sale now.

[kstrong]

Holy Hijack.
Great write up Secondo. Thanks Grabber for making it a sticky.
I always use antiseize compound on plugs. Imagine how tough it will be to remove platimum tipped plugs that have 80-100,00 miles on them?  

[kent1]

Thanks for the write up.  I used this info to install new plugs.  Much appreciated.

[judgeman6970]

great write-up.....curious(dumb question?), do our cars('07-'09 GT500's) have the infamous 2-piece sparkplug??

[Secondo]

judgeman6970, on 06 March 2012 - 03:51 PM, said:

great write-up.....curious(dumb question?), do our cars('07-'09 GT500's) have the infamous 2-piece sparkplug??

No, they are one piece sparkplugs, see pics on page 1.

[gearhead09]

I know im bumping an old thread, just curious what peoples thoughts are. I bought my gt500 with 9960 miles on it, and its been a couple years and im now at 19600. I also have pulley,tune,cai, h/e, and 170 degree t-stat. Do you think its time for a spark plug change? Also I do notice an initial sluggish feeling when I hit the gas maybe a milli second. Would that be because of the spark plugs? Either that or I am getting some minor heatsoak... lol its hard for me to tell the difference. I might change them out anyways, can never be too careful.


Edit: figured my own answer out gonna change them out. Every so often the car has a slight issue starting also didn't really think much of it. I am also pretty ignorant when it comes to cars... no one to learn off of so trying to teach myself. Thanks for all the help.

Edited by gearhead09, 15 September 2012 - 07:28 AM.

[Grabber]

When I installed the smaller Pulley on my stock Super charger, I changed the plugs to the NKG TR6 plugs. Justin over at VMP told me that I should change those plugs every 5 - 10K miles to keep the car running great.

[Secondo]

+1. With the smaller pulley and "Stage 2" setup like we have, Kent at Evolution Performance recommends changing them every year. Gap the NGK's at .032."

[gearhead09]

If I would of payed attention to the beginning of this thread about dropping the spark plug socket into the chamber and not able to get it out it would of saved me a lot of back ache and at least an hour or so... I really recommend attaching the socket to the extension with tape, it will save you so much trouble. Put the NGK TR6's in with there .035 gap that was already on them. So should i have gapped them to .032? I checked the gapping and I moved a couple down a little to reach .035 but for the most part they were spot on.

Edited by gearhead09, 26 October 2012 - 10:35 AM.