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Old 09-25-2011, 12:52 PM   #1
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TFI Upgrade

I've got all the new parts recommended for the TFI upgrade on my '88 YJ 258cu Jeep. I was ready to start the conversion when I came across a couple of threads that mentioned a possible problem with some wires heating up excessively. It seems there might be an issue with the ICM wiring and the new high output coil. Any thoughts and/or suggestions would be helpful. I'm a little nervous making the upgrade as described in the posts then having wiring hotspots afterwards. Thanks

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Old 09-27-2011, 01:06 AM   #2
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i read some where that u have to splice in a ground off of the black wire coming from distributor and i think the ignition module i forget wher i found it try google team rush upgrade, ford tfi jeep upgrade something like that.

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Old 09-27-2011, 02:05 AM   #3
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With the higher voltage you'd need 8mm spark plug wires if that's what you mean. I went hei since it's all in one and had to have at least 8mm the wires going to the coil don't make the voltage but the current might be stepped up. I'll have to check into that hmm
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Old 02-06-2013, 08:38 PM   #4
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I believe it is strongly suggested to run an additional ground from the black wire on the ignition module (driver's side fender well) to the engine block and then to the negative post of the battery.
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Old 02-07-2013, 04:24 AM   #5
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Quote:
Originally Posted by nmtjr77 View Post
i read some where that u have to splice in a ground off of the black wire coming from distributor and i think the ignition module i forget wher i found it try google team rush upgrade, ford tfi jeep upgrade something like that.
You do NOT cut and splice ANYTHING at the Distributor for the TFI upgrade. The only things you do to the Dist. swapping the rotor, cap adaptor, and larger cap. You may be confusing TFI with the Nutter Bypass - but even so, there is no splicing into any grounds - only the purple and orange wires. You wuold also splice into the purple and orange wires at the ignition module for the Nutter Bypass. But once again, that's a completely different thing (though the two together are a pretty awesome team! )


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With the higher voltage you'd need 8mm spark plug wires if that's what you mean. I went hei since it's all in one and had to have at least 8mm the wires going to the coil don't make the voltage but the current might be stepped up. I'll have to check into that hmm
x2. You don't NEED them. But you're gonna' be wasting the benefits of the upgrade, and running through plug wires like hot cakes. 8mm will do you good. Get yourself some "cut to fit" plug wires. Them things are awesome! And are typically of higher quality than the ones out of the box. Should last you MUCH longer.

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I believe it is strongly suggested to run an additional ground from the black wire on the ignition module (driver's side fender well) to the engine block and then to the negative post of the battery.
I've never heard of this... But who knows? I've been known to be wrong probably as often as I'm right.

.....

How far are you going with this TFI upgrade? Are you adding a CDI module or something? "Everything" for the TFI upgrade could be a wide range of parts, actually, depending on how far you're taking the upgrade. If I remember right - TECHNICALLY the only thing the Team Rush or TFI upgrade TRULY is, is an upgrade to your Distributor and plug wires. Now, you can go further with the coil and even a CDI module... But neither of those are required for a TFI upgrade.

I did the TFI (Team Rush) Upgrade on my '89 I-6 and have had no problems with anything overheating or anything like that. Have no clue what these guys are saying about extra ground wires and what-not.

You gotta' let us know some stuff though. What style coil did you decide to go with? Did you stick with the "Canister style" coil (same as your stock one, but "high output" - I would recommend this as it saves you the headache of messing with trying to make or find a bracket for the e-core style) or did you go with the Ford E-core coil? Both are "higher output" so based off of your original post I still have no idea what setup you're running with that.

Like other guys have said - you're gonna' want 8mm MINIMUM plug wires and PREMIUM plugs to get the most out of your upgrade. You CAN run it with "standard" plug wires - I did it for a little bit (the day of, the next day ran to the store and got new ones) and had no problems, to be honest. I wouldn't recommend it though. Get the good stuff right away. You're also going to want to gap your PREMIUM plugs out to about .045... I DIDN'T gap mine, and they still work... You're just not going to be getting the most out of the upgrade. I didn't gap mine because I want to see what the difference is. So I'm running mine non-gapped through the winter (thinking about gapping soon though) and then going to gap them and see how she runs for a year - and maybe make adjustments along the way.

You're gonna' want to get a new "pigtail connector" (forget the real name) - the thing that connects to the top of your coil. It just cuts and splices into the same wires as the old one. Don't worry, nothing too complicated and there are NO extra splices and ground wires and what-not that you're going to need to run.. I only suggest a new connector because bad connectors can cause some freaky and intermittent problems - and are a PITA to figure out down the road. While you're upgrading, might as well replace it. (And if you got the Ford e-core style coil, you're DEFINITELY going to need a different connector.)

If you went with a CDI module, let us know. I have a wiring diagram of how that is all supposed to look. But even with the CDI, there's no extra ground wires or unnecessary splices. IF you ARE running a CDI module, there WILL be a wire that runs straight from the module to the negative battery terminal... But it doesn't ground anywhere else. The MSD instructions for CDI modules I've seen don't have you ground other than the wire running to the negative battery terminal.

I don't know where you're reading about this overheating thing... It may be something year-specific (though I doubt it) but I've never heard of it and would think that the inventor of the "Team Rush" upgrade (not me) would've included this information in his upgrade instructions (which I have never read about - though I may have missed something. I'm definitely not perfect).

Anyways - let us know what else we can do for you.
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Old 02-08-2013, 05:38 AM   #6
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Not everyone has needed the extra ground wire, which may be the difference in the coil or it may mean there was a bad ground to begin with. I've even seen posts where people have said that they needed to put a ballast resistor on the positive coil wire because they keep burning out the e-core coils. Some brands/part numbers run on straight 12v and some need 8v. My take is, an extra dedicated ground wire can't hurt. Finding out after the insulation has roasted off of one of the wires is not how I want to go.

http://www.squidoo.com/jeep-tfi-team-rush-upgrade

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