07SGTC Posted March 16, 2014 Report Share Posted March 16, 2014 Who out there can tell me the benefits of changing the stock coil packs? What type of plugs should be used when changing out the stock ones? Quote Link to comment Share on other sites More sharing options...
MMcGuirk Posted March 16, 2014 Report Share Posted March 16, 2014 I have had issues with aftermarket coil packs. Stick with the OEMs Quote Link to comment Share on other sites More sharing options...
jmn444 Posted March 16, 2014 Report Share Posted March 16, 2014 I am a believer that stock ignitions generally can keep up with pretty much anything till you get to a dedicated race car status.... no reason to change other than cosmetics in most cases. Quote Link to comment Share on other sites More sharing options...
Steve.Madrid Posted March 17, 2014 Report Share Posted March 17, 2014 I am a believer that stock ignitions generally can keep up with pretty much anything till you get to a dedicated race car status.... no reason to change other than cosmetics in most cases. Good info and I trust what you have to say. I have seen a few advertisements which claim 2-3 HP gains but I would agree that appearance is the biggest benefit. Quote Link to comment Share on other sites More sharing options...
JeffJ Posted March 17, 2014 Report Share Posted March 17, 2014 (edited) Absolutely agree to stick with the stock coil packs. I had to change mine with the new heads to the newer coil packs (2008+) so I though I would change to aftermarket since I had to change anyhow. I went with Granetelli's since I've always known them to be a good name in racing. Guess what, they were absolute junk. We couldn't get a good tune for nothing. Kept getting misfire codes, on and on. My tuner told me that the stock coil packs are good to well over 700 hp, probably over 900. So I ordered new Ford coil packs and the tune went clean. So yes, I have not heard of any aftermarket coil packs for the 3V motor which can even compare to stock. As far as plugs go, I had to go a range colder for the SC, but mainly, I would just change to a good one piece plug to help alieviate the possibility of breakage. Edited March 17, 2014 by JeffJ Quote Link to comment Share on other sites More sharing options...
07SGTC Posted March 18, 2014 Author Report Share Posted March 18, 2014 Great info! Is it very difficult getting the old two piece plugs out? Quote Link to comment Share on other sites More sharing options...
jmn444 Posted March 18, 2014 Report Share Posted March 18, 2014 Mine got swapped at 18k miles, and came out easy. Probably will vary with time and mileage. Quote Link to comment Share on other sites More sharing options...
JeffJ Posted March 18, 2014 Report Share Posted March 18, 2014 Probably also depends on the climate where you live and how well the car is taken care of, being in a garage, etc. I've only heard a couple of horror stories, but have never seen any problems myself. Mine came out like butter at 30K miles. I have a buddy who pulled his at 145K miles on his GT with no problems at all. P.S. do you want a set of near new Granatelli coil packs? Only dyno time on them......! Quote Link to comment Share on other sites More sharing options...
Rickv09shelby Posted March 31, 2014 Report Share Posted March 31, 2014 My stock plugs are burning the electrode tips on my 2009 GT500. Everything is stock including the tune except for the Pype bombs axle back exhaust. I took it in to the local Ford dealer a few months ago and they replaced all the plugs with stock Autolite variety and replaced the fuel pump. Now about 4,000 mile later the plug tips are burning again. Has anyone else had this problem? Could just the exhaust cause it to lean out this much without throwing a code? Quote Link to comment Share on other sites More sharing options...
JeffJ Posted April 1, 2014 Report Share Posted April 1, 2014 My stock plugs are burning the electrode tips on my 2009 GT500. Everything is stock including the tune except for the Pype bombs axle back exhaust. I took it in to the local Ford dealer a few months ago and they replaced all the plugs with stock Autolite variety and replaced the fuel pump. Now about 4,000 mile later the plug tips are burning again. Has anyone else had this problem? Could just the exhaust cause it to lean out this much without throwing a code? Probably be better off asking that question in the GT500 tech section. You are in the Shelby GT/GT-H section. Quote Link to comment Share on other sites More sharing options...
SGT3477 Posted April 12, 2014 Report Share Posted April 12, 2014 changed out my plugs at 60K miles and if you are careful and take your time they come out OK- at least for me. there are several threads and how-tos on the web. Quote Link to comment Share on other sites More sharing options...
ledfoot73 Posted April 23, 2014 Report Share Posted April 23, 2014 I would have a plug extractor kit handy. At 45k, following the Ford TSB instructions, I had 7 come out fine, one not. I used the NAPA extractor kit and getting the broken one out was not a problem. Scared the heck out of me at first though. Quote Link to comment Share on other sites More sharing options...
2010KonaBlueGT Posted April 24, 2014 Report Share Posted April 24, 2014 Good info and I trust what you have to say. I have seen a few advertisements which claim 2-3 HP gains......... That is absolute bullshit. You will NOT gain any horsepower (or torque) with high performance coil packs or coils. Your ignition system only requires Nn KV and no amount of reserve voltage will force anything other than the required voltage for the engine. If you require more voltage than what the coils can put out a hi-perf coil would be in order. But considering you typically have ~75% reserve voltage that would be pretty much impossible. You would have to increase boost by about 500% to require more voltage than a OEM coil pack is capable of producing. It's marketing hype, as simple as that. Phill Quote Link to comment Share on other sites More sharing options...
Larry T Posted April 24, 2014 Report Share Posted April 24, 2014 Great question and answer .... you learn something new everyday. Quote Link to comment Share on other sites More sharing options...
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