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General Forums => The Mess Hall => Topic started by: Nicks92jeeper on November 19, 2011, 03:27:47 AM
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So I have the MSD ignition coil for my Jeep and that runs at 40,000 volts, stock distributor cap and rotor and double platinum I think iridium plugs. Anything better for plugs or the setup I have? What gapping on the plugs could I get away with? I think they are set at the recommended gapping. Is gapping plugs more about experimenting with what your engine likes? Will better wires give me much of an improvement.
Anything else I need to consider?
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the wires are one of the most important parts. doesnt matter what the coil is if the wires are too high resistance to make use of it. you need good set of low resistance wires and then id say go ahead and start playing around with the gap a little. just dont go to far with the gap or youll start missfiring from the spark not being strong enough to make the gap.
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For wires then. what size would you recommend?
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I also have the MSD ignition coil at 40,000 volts. Should I be looking at something better than that coil?
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No that coil is fine, just get some performance wires that are 8mm or Higher and are made well
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http://www.performancedistributors.com/livewire.htm :thumbsup:
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Those wires shure are purdy!!! Thanks for the link and the info. Out of curiosity, does anyone know how many volts the screamin demon coil puts out. I got a 40,000 on my MSD coil and was wondering the difference. I already have 8mm wire but they are just autolites and not really for performance.
I figured with the intake mods and swapping out the injectores with the ones that came out of the Lincoln Town car that this would just about be as fine tuned as I can go without spending serious cash.
With a bored out 4.0 TB, cold air intake system, openened up opening on the intake manifold, P and P, injector swap and ignition coil, what would be a safe estimate that gapping the plugs and adding performance wires would get me. Am I looking at 1 or 2 miles per gallon better and a bit better HP or am I looking at less? Will it be worth the money for performance or just smiles per mile. My Jeep already sounds like my dads F250 and any more I fear the cops will be called for disturbing the peace!
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Those wires shure are purdy!!! Thanks for the link and the info. Out of curiosity, does anyone know how many volts the screamin demon coil puts out. I got a 40,000 on my MSD coil and was wondering the difference. I already have 8mm wire but they are just autolites and not really for performance.
I figured with the intake mods and swapping out the injectores with the ones that came out of the Lincoln Town car that this would just about be as fine tuned as I can go without spending serious cash.
With a bored out 4.0 TB, cold air intake system, openened up opening on the intake manifold, P and P, injector swap and ignition coil, what would be a safe estimate that gapping the plugs and adding performance wires would get me. Am I looking at 1 or 2 miles per gallon better and a bit better HP or am I looking at less? Will it be worth the money for performance or just smiles per mile. My Jeep already sounds like my dads F250 and any more I fear the cops will be called for disturbing the peace!
if you get 5% more air compared to before and you added 5% more fuel you're lookint at 5% more HP - so that would be 6HP for the 2.5L. all guessing game unless you do some AFR monitoring/logging at wot before and after the changes or some dyno time.
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They don't list the volts on their web site. But the wires are 10mm.
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5% is still better then what I had before!
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5% is still better then what I had before!
that was an example, but if your injectors have 5% more flow it is a good guestimate
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You only need the voltage higher if the compression of the engine is higher.
At anything under 12 or 14 : 1 40K will do the job fine.
Spend your money on better injectors before a better coil.
If you go too high on the voltage it can start arcing to the piston
Or the head and do bad things (TM)
Dave
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About 2 months ago I went with the #19 stock mustang injectors. Well I got them out of a Lincoln Town car. I like the response I got from those and helped the engine come alive. At this pont I do not want to mess around with fuel pressure. This summer I had to fix the head gasket and had to have the head plained down a bit so that created a bit of difference and the engine had a bit more pep. With all the upgrades I have on the engine primarily on air and exhaust flow and the MSD ignition coil I have, I just wanted to have all the benefits I can have. In the next week I will be getting some performance wires and then start gapping to see what happens.
Thanks for all the info everyone.
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About 2 months ago I went with the #19 stock mustang injectors. Well I got them out of a Lincoln Town car. I like the response I got from those and helped the engine come alive. At this pont I do not want to mess around with fuel pressure. This summer I had to fix the head gasket and had to have the head plained down a bit so that created a bit of difference and the engine had a bit more pep. With all the upgrades I have on the engine primarily on air and exhaust flow and the MSD ignition coil I have, I just wanted to have all the benefits I can have. In the next week I will be getting some performance wires and then start gapping to see what happens.
Thanks for all the info everyone.
Ford 19# flow slightly less than the stock ones (by 0.1 lbs/hr so it's negligible) but probably compared to your old ones these would flow and atomize better, i would say you brought your engine back to stock specs with no or minimal power increase. You'd get better power output with about 5psi increase in fuel pressure (I wouldn't go higher than that).
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I knew that they were slightly less for # but after the install it felt better. I liked the noise it made and it just all around ran better. Then I seafoamed the crap out of the system which pry did nothing but cost me $8.00 but I felt better about it!! Pry no power gains if minimal at best , like you said.
With the fuel pressure, for a guy who doesn't have a machine shop, what would be a good option (For fuel pressure regulators) for that? I thought I read that there were a few you could swap in from other vehicles so as to not spend hundreds of dollars but I am not sure. Then again with my Jeep I am in a location with really no serious trail (IOWA) and no serious crawlin so power output is not a serious thing on my mind but is nice. I also use my jeep as a daily driver so the route I have been going for is to increase fuel efficiency as well as HP, compared to just HP and torque. Right now where I live, I could race any 2.5L Jeep and I know I could win! Which the last sentence really does go against what I am aiming for. :nono:
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I knew that they were slightly less for # but after the install it felt better. I liked the noise it made and it just all around ran better. Then I seafoamed the crap out of the system which pry did nothing but cost me $8.00 but I felt better about it!! Pry no power gains if minimal at best , like you said.
With the fuel pressure, for a guy who doesn't have a machine shop, what would be a good option (For fuel pressure regulators) for that? I thought I read that there were a few you could swap in from other vehicles so as to not spend hundreds of dollars but I am not sure. Then again with my Jeep I am in a location with really no serious trail (IOWA) and no serious crawlin so power output is not a serious thing on my mind but is nice. I also use my jeep as a daily driver so the route I have been going for is to increase fuel efficiency as well as HP, compared to just HP and torque. Right now where I live, I could race any 2.5L Jeep and I know I could win! Which the last sentence really does go against what I am aiming for. :nono:
Certain people with pull actually got Sharp to make them for them for much less than the Hesco runs... :whistle: :wall: :nod:
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if you have a spare FPR you could try to slightly compress it in a vice to increase thre pressure using 2 of 12 point sockets, one to fit right under the outer diameter where the clamp goes but on the rail side, the other one around the vac fitting. I have not tried it on the Jeep FPR but i did it with some success on BMW ones (on some 90s models) - takes a lot of press and try in small increments and it happened also to bend it out of shape too, so it's not a sure thing but it can be done - basically press a little, install and check pressure, do it again until you get to the desired psi. most challenging part is the small socket around the fitting, it's hard to keep straight since is small diameter, better to have something with a wider base so it keeps it aligned with the larger socket.
otherwise Hesco is the best option, other compatible FPRs i saw or were listed here in a post were too far off the stock pressure.
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Something I have not seen mentioned so I will,,,
Never go by the factory rating on coil voltage, many use a full 16.5 volts
(Alternator level) off a heavy DC power supply to rate their coils.
Also spark-plugs have different resistance levels. So you have to
match plug to wire to get the total resistance you want in the circuit.
Bosch are higher, NGK lower in general at a given heat range.
Gap affects the rise time of the coil, bigger the gap the longer the coil
saturates because the resistance across the gap is huge until the mixture
density and the spark energy reach the point an arc can occur. Higher
pressure means higher voltage to bridge the gap.
In "the old days" we used a engine oscilloscope to see the spark
discharge pattern during engine ignition. with it we could match gap,
plug, wire,coil, distributor for best ignition. Not many mechanics use
real scopes any-more...
Just some thoughts...
Dave
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So out of curiosity, do the live wire plug wires come with the ignition coil wire? I am looking around and finding that a lot of the different types out there only come with the wire that goes to the spark plugs to distributor which kind of defeats the purpose. I will pry give them a call later and see but figured I would ask and see if someone else knew.
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So out of curiosity, do the live wire plug wires come with the ignition coil wire? I am looking around and finding that a lot of the different types out there only come with the wire that goes to the spark plugs to distributor which kind of defeats the purpose. I will pry give them a call later and see but figured I would ask and see if someone else knew.
Yes, it comes with all 5 wires... Plus the dielectric grease (sp?). You could also get the kit that includes the distributor cap and rotor, as well as billett aluminunm wire holders.
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I think I will get the wires and the cap and rotor even though I just changed out the cap and rotor a a year ago. 10mm sure beats the MSD 8.5mm. Everything I read about them and research just seems to make them more appealing!
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http://www.performancedistributors.com/faqs.htm
They say the screamin demon is 50,000volts!!!
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http://www.performancedistributors.com/faqs.htm
They say the screamin demon is 50,000volts!!!
That should light your fire! :truck: