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  #1  
Old 02-26-2015, 01:54 AM
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Ignition coils and tb for 5.7

Is it worth it to upgrade the ignition coils with after market ones? Also any input on upgrades throttle bodies. Fast man, bbk, modern muscle? Is one better than the other? Any other options out there?


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Old 02-26-2015, 04:05 AM
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I switched out my ignition wiring to Taylor shorties. I didnt see a difference in anything besides cleaning up that rats nest of wires. Look great and change the firing sequence a little but no mpg or power loss.

TBs help alot with accelerating. That's about it maybe a few hp increase up top but it's debatable. Though this guy named dmsfun if he replies to this thread will say it will cause your AF ratio to be messed up without a custom tune and blow up your engine.. Totally false. Though if you do want more noticeable performance the tune is the way to go.

All the people you mentioned charge alot for their stuff. Not saying their work isnt worth it but a fellow member on here named hummer recovery team does porting. Good work and very affordable.
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Old 02-26-2015, 05:42 AM
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Re: Ignition coils and tb for 5.7

I wasn't limiting my self to those three They're just the only ones I've heard of plus another member on here flyinryan but I though I read he doesn't work on tb anymore


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Old 02-27-2015, 01:14 PM
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Re: Ignition coils and tb for 5.7

I'm also really curious about ignition coils on the hemi. Anyone know the benefits, or if their even marginally worth all that money?
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Old 02-27-2015, 02:20 PM
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I'm also really curious about ignition coils on the hemi. Anyone know the benefits, or if their even marginally worth all that money?
All? Its like 80 bucks for shorties. Used to almost pay that to fill up my jeep.
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Old 02-27-2015, 04:02 PM
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Re: Ignition coils and tb for 5.7

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Originally Posted by Sully6541 View Post
Is it worth it to upgrade the ignition coils with after market ones? Also any input on upgrades throttle bodies. Fast man, bbk, modern muscle? Is one better than the other? Any other options out there?


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I've got both hotter coils and a bigger throttle bodies on both my Hemi vehicles, and here's my take.

1. If you're stock, especially with stock exhaust manifolds, a bigger throttle body won't help too much. If you've increased the volumetric efficiency (VE) of the engine with headers a good cat. back exhaust and a CAI of some sort, you'll notice a pretty good gain. I've got an aftermarket camshaft, 6.1 valve train, custom header back exhaust, etc. and use a BBK 90mm throttle body on my Hemi WK and a BBK 85mm TB on my Hemi LX.....which is modified identically to the WK. With this configuration the throttle body (either 85 or 90mm makes a very noticeable difference. The 90mm on the WK is noticeably different (better) than the 85mm on my LX. A 90mm unit, with the good exhaust/intake and performance camshaft will give a gain of about a 30% in airflow, all because of increased VE. With all stock components you won't see much difference. Also, FWIW, the TB's were one of the last mods. I did, not among the first. You have to increase the VE of the engine first.

2. As far as the coils go, I run Sultans of Spark (SOS) coils on both my Hemi's. They are touted to provide almost twice the voltage as the stock coils. I converted my 05 first from the stock setup to the Taylor Shorty setup and then to the late model (coil over both plugs like the later models) type setup. These coils also allow you to run a spark plug gap of up to .065 in. I started with aa .060 in. gap using a standard NGK copper plug, and, at higher RPM, I was experiencing "spark blowout". On the advice of the SOS folks, I reduced the gap to .054 in. and now all is well. Too much compression pressure will cause this to occur. On the other Hemi, I am experimenting with NGK platinums, also gapped at .054 in. and have not had any problems with it.

3. The biggest thing I noticed with the coils is the improved idle quality and a slight bump up in fuel economy.....probably due to the improved combustion because of the larger plug gap, and higher voltage spark.

4. I have not taken either vehicle to the drags since doing these mods, but will next month when the track opens. Then I'll be able to quantify any differences, but not which helps the most or least. IMO, I am thinking a .2-.3 second improvement in 1/4 mile elapsed times. Time will tell.
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Old 02-27-2015, 05:01 PM
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Re: Ignition coils and tb for 5.7

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Originally Posted by Sleeps View Post
All? Its like 80 bucks for shorties. Used to almost pay that to fill up my jeep.
He has a 2010 which has the coil over both plugs. To change them to a higher output coil setup costs over $300. By the way, SOS makes them for the early Hemi's too, but you'll still need the Shorty wires. On your 05 (like the one of mine I converted) the cost would be even higher yet, as you'd need late model valve covers, the coil plugs, and the coils. Not cheap. On mine, I just wanted them to be the same so everything is interchageable, plus I don't have any other significant mods that I am planning to do, and the $$$ was burning a hole in my pocket, LOL.
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Old 02-27-2015, 05:24 PM
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Quote:
Originally Posted by jeepgcoman View Post

He has a 2010 which has the coil over both plugs. To change them to a higher output coil setup costs over $300. (By the way, SOS makes them for the early Hemi's too, but you'll still need the Shorty wires. On your 05 (like the one of mine I converted) the cost would be even higher yet, as you'd need late model valve covers, the coil plugs, and the coils. Not cheap. On mine, I just wanted them to be the same so everything is interchageable, plus I don't have any other significant mods that I am planning to do.
Ya realized that he could have ment the coils setup after the fact. I looked into it for 05s. Not even remotely interested after I saw the total price haha.
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Old 02-28-2015, 06:33 AM
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Re: Ignition coils and tb for 5.7

Thanks for the replies! So in your opinion get. A cat back first before the tb or is it still not worth it without changing the manifolds? I thought I read somewhere that the tb was best bang for you buck mod. In terms of felt gains. If it makes a difference I have a catch can and cai


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Old 02-28-2015, 02:30 PM
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Re: Ignition coils and tb for 5.7

Yes, that is my opinion, and not just a cat back. Without improving the VE of the engine you'll only get minimal gains, if any. Again, IMO, some folks pay big $$$ for at TB and almost have to say it works to justify the expense. I am just saying you certainly won't get anywhere near the full potential without getting rid of the biggest choke point (exhaust manifolds) in the combustion tract of the 5.7. (With a bigger TB, you'll be able to get the air into the engine, but not out.) If you're not aware, Chrysler used the same stock 80mm throttle body on all of their 2010 and earlier Hemi's....5.7, 6.1 and 6.4's, so you know it is adequate for those displacements in stock format. To give you an idea of the differences, below are a couple references I had done showing the differences between the stock 5.7 WK (the smallest), the stock 5.7 LX (Chrysler 300C, Dodge Magnum and Dodge Charger) exhaust manifolds, and my custom built headers....see Post No. 8 of second reference. My collectors are 3 in. making the whole system, from collector back to the tailpipe, 3 in.

A better exhaust system for the 5.7 WK??

Headers for my 5.7 Hemi

In the end though, it's your choice and $$$ to spend on what you feel is the best bang for the buck. The throttle body change was the next to the last mod. I did, and the ignition coils was the last mod. I did. My reasoning was to make the VE of the engine as good as I could get it without major engine teardown (see signature) and then do the last couple things that will help it a little more. If you don't have a tuner, IMO FWIW, that would be a better bang for the buck than either a TB or coils, at least until you get the exhaust squared away.
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Old 02-28-2015, 02:47 PM
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Re: Ignition coils and tb for 5.7

Quote:
Originally Posted by Sully6541 View Post
Is it worth it to upgrade the ignition coils with after market ones? Also any input on upgrades throttle bodies. Fast man, bbk, modern muscle? Is one better than the other? Any other options out there?


Sent from......
Also, Sully, the $$$ you'd spend on a TB and coils, would just about cover the cost of a used set of SRT stock headers and a good 3 in. straight through cat. back exhaust. This would bring you probably a ~25-40 hp., depending on how efficient the 2010 exhaust is. To give you an idea, 4 years ago this month it cost me $1400 to have my custom ceramic coated headers and 3 in. exhaust built, and that was experimenting with 3 different muffler/resonator combinations in order to get the sound the way I wanted it.
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05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.
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