Nofeartoys Posted April 28, 2016 Share Posted April 28, 2016 I was curious if anyone has used a performance coil on a approx year 88 4.0. I'm trying to get more info from Holley/accel waiting info. Appears that some coils look similar. For gm and possibly Volvo Don't see why they haven't made a hei coil to apply. Let me know if you know something. And I will relay info from Holley when they reply Link to comment Share on other sites More sharing options...
Eagle Posted April 28, 2016 Share Posted April 28, 2016 The Jeep ignition is already a high energy system. Buying an aftermarket coil is just a waste of money. Link to comment Share on other sites More sharing options...
FrankTheDog Posted April 30, 2016 Share Posted April 30, 2016 The factory coils already have enough power to wear out your spark plugs in 50,000 miles. And they'll do it for 200k plus. Link to comment Share on other sites More sharing options...
Minuit Posted April 30, 2016 Share Posted April 30, 2016 No need for a "performance" coil. The ignition system is very good from the factory. Link to comment Share on other sites More sharing options...
cruiser54 Posted April 30, 2016 Share Posted April 30, 2016 The factory coils already have enough power to wear out your spark plugs in 50,000 miles. And they'll do it for 200k plus. 30,000 miles......LOL. There are other things you can do to gain performance that are way more worthwhile. Link to comment Share on other sites More sharing options...
86FUBAR Posted April 30, 2016 Share Posted April 30, 2016 When I was in high school the shop teacher had this old machine that tested coils (along with some other stuff that I can't recall ) it was a huge machine , probably 6 ft long 6ft tall with all these big analog gauges on it and was older than dirt and one day in class during an argument over "hot" coils he decided to drag this thing out and we spent the entire class playing with different coils . This thing would show you all the inputs , out put , voltage , resistance , etc ... Along with the actual spark in a controlled box and when we tested a stock coil to a "hot" coil the "hot" won ! In all the tests . It was at or above its rated output and was significantly better than the stock . I saw this with my own 2 eyes . ( we tested a lot of coils that day among other things) Then the argument came about that even though the hot is better how much difference will it make on a stock fuel injected car compared to a stock carbed engine , in most of our cases probably not much but how many of us have an aftermarket "performance" air filter ? Most of us right ! Did your truck turn into a rocket ship after you spent $50 bucks on a air filter or more for the cold air intake setup! Mine didn't . Did it help ? sure it did , the slight increase in mpg showed it but hey , if the factory "engineered" the ignition so perfect then one would think the did the same with the intake right ? As we modify things like installing bigger injectors we just threw out the factory "engineered" specs ,sure the factory coil was perfect ! In stock form as it was "engineered" to be and now things have been "modified" now is the stock coil still with in it operating range.... ? .The way I see it is that every little thing helps and some may help more than others but it all adds up in the end Link to comment Share on other sites More sharing options...
cruiser54 Posted April 30, 2016 Share Posted April 30, 2016 Fact remains our stock ignition system is plenty good from the factory and that the aftermarket coils are prone to untimely deaths in the most inopportune circumstances. It ain't a Ford or Chevy. Link to comment Share on other sites More sharing options...
Eagle Posted April 30, 2016 Share Posted April 30, 2016 when we tested a stock coil to a "hot" coil the "hot" won ! In all the tests . Are you saying you tested a stock AMC Jeep XJ/MJ coil against an aftermarket "hot" coil, or just some factory coil off whatever vehicle you happened to have a coil from? The factory Jeep ignition is an HEI system. Don't waste money trying to "improve" it. Link to comment Share on other sites More sharing options...
86FUBAR Posted May 2, 2016 Share Posted May 2, 2016 when we tested a stock coil to a "hot" coil the "hot" won ! In all the tests .Are you saying you tested a stock AMC Jeep XJ/MJ coil against an aftermarket "hot" coil, or just some factory coil off whatever vehicle you happened to have a coil from? The factory Jeep ignition is an HEI system. Don't waste money trying to "improve" it. Dang you got me ! Nope , didn't have a stock xj / mj coil . We used GM HEI ,GM / Mopar can style and some stuff I don't recal what it was . Everything was tested with its equal performance replacement following the stock . Also looked at some failed coils , cutaways etc... Link to comment Share on other sites More sharing options...
johnj92131 Posted May 2, 2016 Share Posted May 2, 2016 Hey, what ever floats your boat! If you think a "hot" coil is important to you, then go for it. No Problem. It is just that most of us think there are better things to do than spend our money on a "hot coil". Like I said, what ever floats your boat!! Me? I would rather just replace the old plug wires and get the factory spark to the plug in good condition! Link to comment Share on other sites More sharing options...
FrankTheDog Posted May 2, 2016 Share Posted May 2, 2016 The factory coils already have enough power to wear out your spark plugs in 50,000 miles. And they'll do it for 200k plus. 30,000 miles......LOL. There are other things you can do to gain performance that are way more worthwhile. Yeah, they'll burn em up in 30k but they throw enough spark that they'll still be running at 80k. Link to comment Share on other sites More sharing options...
86FUBAR Posted May 3, 2016 Share Posted May 3, 2016 Hey, what ever floats your boat! If you think a "hot" coil is important to you, then go for it. No Problem. It is just that most of us think there are better things to do than spend our money on a "hot coil". Like I said, what ever floats your boat!! Me? I would rather just replace the old plug wires and get the factory spark to the plug in good condition! I'm not saying that "hot" coils are the best thing in the world ! I'm just saying that they aren't " snake oil " like they are being made out to be ... It seems that some people think that the "engineers" from 25+ years ago had it all figured out and nailed the perfect coil on there first try or something and no improvements could possibly be made ! If the "engineers" we're so good we wouldn't have to fix so much stuff on these trucks or am I to assume that they were so tied up "engineering" the perfect coil that they forgot about some of the other stuff. I guess my argument wasn't made that clear in my first post ...what ever. Link to comment Share on other sites More sharing options...
gogmorgo Posted May 3, 2016 Share Posted May 3, 2016 When considering the "best" option, the engineers also have to consider cost. The factory coil won't be a significant enough decrease in performance over a "performance" coil that the average person would notice or care, but the extra cost of production, even at just $1 per coil, in the volume that Jeeps with said coil were produced, could save several million for the company. Sure, one component at 1 or 2 dollars more, pass the cost along to the customers, but if you do that for every component of the vehicle, you're producing vehicles at a higher price than your competitors, and unless you put in significantly better/more expensive components, you end up with a product that really isn't any better than the competition but still costs much more, that could possibly reduce reliability (parts making more power put greater stress on other components or else adds weight which negates some or all of the performance gains) and ultimately loses customers. Any company is in there for profit. If they built cars that last forever, they eventually would run out of customers. If they built expensive cars that aren't much better than the competition, they lose customers. You, presumably the end user, can make your own decisions, whether you want to spend the extra to add performance. Just don't expect the coil individually to be noticeable to the butt-dyno. But combine it with a bunch of other tiny gains, and you just might start noticing. Link to comment Share on other sites More sharing options...
daking Posted May 3, 2016 Share Posted May 3, 2016 I've been racing for years. I've been modifying for decades. Adding a performance coil to a stock, or lightly modified engine, the owner my not notice a difference. It is a mod that is supposed to go hand in hand with other mods. Like most mods, by it's-self will yield nominal results. However, with the right recipe of mods, a coil (or another mod) will result in improvements. Most performance coils use extra coil windings to get a "Hotter" spark that can jump a larger spark gap. So, you can increase your gap to achieve better cylinder ignition. If your engine is modified or you plan on gong that direction, I'd spend the extra coin on a performance coil. Link to comment Share on other sites More sharing options...
DirtyComanche Posted May 3, 2016 Share Posted May 3, 2016 IMHO it's a supporting mod. You do supporting mods so your other mods work correctly or better. This is a low compression 'truck' engine, the factory ignition system is beyond adequate for that. So, does anyone make one anyways? Not much point getting excited if there isn't one. Although I'm sure you could adapt something else to work. Link to comment Share on other sites More sharing options...
daking Posted May 4, 2016 Share Posted May 4, 2016 There are at least 2 on the market, one is from MSD. I can't recall who makes / sells the other. Link to comment Share on other sites More sharing options...
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