TFI ignition upgrade

TFI ignition upgrade

258 I6 engine
Published by TerryMason
11-16-2005

TFI ignition upgrade

Jeep 258 TFI ignition upgrade - Using stock Ford parts, you can upgrade the ignition in your Jeep, allowing much better performance, gas milage, and reliability

Which engines can use this upgrade
The Jeep 258 CID I-6 from 1978 to 1990

Why would you want to do this?
Before I did this upgrade my jeep would not idle, it would hesitate and die all the time. This upgrade gave my Jeep the feeling of a new engine! It idles fine (even with the carter carburetor) and has more pickup and no hesitation. I would imagine that my Jeep now gets better gas mileage and has less emissions (although I have no real proof of this). Plus this upgrade only costs about $100. The upgrade is said to be better than the HEI.

What you need:Distributor cap, rotor, base (this distributor is a two piece type, with a base that mounts to the motor and a cap that clips to the base), spark plug wires, and ignition coil. All these parts are from a 1982 Ford F-150 Pick Up Truck With A 300 CID I-6 Engine
OPTIONAL : Distributor centrifugal advance springs, these get installed in the distributor and give you more midrange pickup.

#1 (permalink)

By TerryMason on 01-26-2008, 03:00 PM

Re: TFI ignition upgrade

Part Numbers of things you will need

	Rotor	Cap	Cap Adapter
Borg Warner	D219	C193	C193A
AC Delco			F334
Napa	FA159	FA136	FA139
Standard Ignition
Wells	F953	F952	F960
Niehoff	FF59A	FF78	FF78A
GP Sorensen	FR106	FR121	FR109
Autolite
KEM

	Ignition Coil	Ignition Wires	Coil Connector
Borg Warner	E92**	CH857*
AC Delco	F503Z
Napa	IC24	700313	ICC1
Standard Ignition	FD479		S-539
Wells
Niehoff	FF-179
GP Sorensen	GC407S
Autolite		86171
KEM	342FX	11-6007M

* CH857 is the wire set for a V8. The V6 equivalent is CH631. These are basically the same wires though, but with CH857 you get two extra wires
**Evidentially, the E92 is a premium
coil, the E92P is the non premium and cheaper version.

Last edited by TerryMason; 01-26-2008 at 03:08 PM.

#2 (permalink)

By TerryMason on 01-26-2008, 03:02 PM

Jeep TFI install process

How it's done: (click on the image to see a larger one)

	Start with the stock 258 ignition
	Take off the distributor and the plug wires
	Now screw down the new distributor base, it should line up perfectly with the old screw holes
	Put the new rotor and distributor cap on.
	Install new plugs and gap them depending on the chart below, if you Follow this article, you will use a gap of .045". Install the plug wires and coil, make sure you get the firing order right, its 1-5-3-6-2-4
	This is the TFI coil, which provides a big advantage over the stock coil.
	I made this connector, which is just a one foot of speaker wire with two female connectors on one end (the new coil end) and two male connectors on the other end (which goes to the old coil connector). I plugged one end into the new coil and the other into the old coil harness.
	Either get a bracket or make one, or you can just use the bold holes on the coil to bold it to the fender well.
	After possibly tinkering with the timing (you'll have to decide if you need this or not) You're done!

Spark plug gaps

stock canister type coil	-	0.035"
HEI, TFI, or any of the high out put aftermarket coils	-	0.045"
MSD module or other CDI ignition module	-	0.045" to 0.065"

Last edited by TerryMason; 01-26-2008 at 03:10 PM.

#3 (permalink)

By TerryMason on 01-26-2008, 03:08 PM

Questions and Answers

I've gotten several questions about this upgrade, and am in the process of compiling a list offrequently asked questions. If you have a question, please post here

Here is the list so far:
Q: Where did you get the background for this?
A: From the Off-road.com BBS (posted by Team Rush) click here to see the original posts.

Q: What vehicle are these parts from?
A: 1982 Ford F-150 Pick Up Truck With A 300 CID I-6 Engine.

Q: Do you need to start using premium fuel after this upgrade?
A: Nope, After I upgraded my two Jeeps, I was able to stop using premium and use regular unleaded.

Q: Does it work with the Nutter by-pass?
A: Although I have never tried it, this should work fine.

Q: Are there any other websites with info on this upgrade?
A: Sure, try these:

Trailhed.com a Jeep Information Web Site
http://www.driveajeep.com

#4 (permalink)

By t3chn1c0 on 03-08-2008, 06:41 PM

Re: TFI ignition upgrade

Is the 258 distributor the same as the distributor for the 4.0L? Besides the Coil, what makes this better?

#5 (permalink)

By TerryMason on 03-08-2008, 08:29 PM

Re: TFI ignition upgrade

I don't know if the distributor is the same, but I'd guess not

this system has a better coil, and a larger distributor cap - the terminals are farther away on the new cap (the stock cap is pretty small). This prevents the spark from your new hotter coil from jumping from one plug wire to the next. Also, the plug wire are better.

#6 (permalink)

By josieg72 on 04-17-2008, 06:50 AM

Re: TFI ignition upgrade

is there anything like this for a 1977 CJ7 V8 Jeep?

#7 (permalink)

By TeamRush on 05-10-2008, 08:53 PM

Re: Questions and Answers

Quote:

Originally Posted by TerryMason

And I got it from racing AMC's for 30 or so years.

Quote:

Q: What vehicle are these parts from?
A: 1982 Ford F-150 Pick Up Truck With A 300 CID I-6 Engine.

'82 gets you the screw down cap adapter.
If you try other years, you might wind up with a clip down adapter, and that won't work with the '78 to '86 Jeep/Motorcraft distributor.

Quote:

Q: Do you need to start using premium fuel after this upgrade?
A: Nope, After I upgraded my two Jeeps, I was able to stop using premium and use regular unleaded.

Will not require any different fuel, and in fact, you may be able to run cheaper fuel since the cylinders are actually getting fired when they are supposed to.

Quote:

Q: Does it work with the Nutter by-pass?
A: Although I have never tried it, this should work fine.

Works fine with the 'John Nutter Bypass'.

Quote:

Q: Are there any other websites with info on this upgrade?
A: Sure, try these:

Lots of 'Clones', but most of them have incorrect information...
Since this is an evolving thing, the information changes when I get my hands on different parts...

SOMETHING YOU SHOULD REALLY STRESS!
Brass terminal caps!
Nothing like a distributor with brass terminals instead of aluminum!

Once aluminum oxidizes from the high voltage discharge, the aluminum is no longer a conductor...
Hard to get a plug wire to fire if you take it's conductor out of the circuit!

#8 (permalink)

By TerryMason on 05-31-2008, 10:07 PM

Re: TFI ignition upgrade

Thanks TeamRush!

#9 (permalink)

By black87yj on 06-02-2008, 09:32 AM

Re: TFI ignition upgrade

just finished the tfi upgrade and what a rush (pun !) the 2150 carb and ford dist and nutter have transformed my jeep . the milage power and driveavbility are awesome. THANK YOU !

#10 (permalink)

By ursman on Today, 12:02 PM

Re: TFI ignition upgrade

Great article! I'm thinking about doing this to mine. Is it necessary to change the gear on the distributor? I know with other conversions (Chevy HEI) they say that the gear is reversed and needs to be changed out. From what I read here though, it seems to be a direct bolt on swap.

#11 (permalink)

By TerryMason on Today, 12:11 PM

Re: TFI ignition upgrade

You are really just changing the distributor cap, and adjusting the timing. No need to change out any gears.

#12 (permalink)

By TerryMason on Today, 01:27 PM

Re: TFI ignition upgrade

Yep, you are swapping in a better coil. This better coil creates a bigger spark, so you need to upgrade the plug wires. The new distributor cap is larger, and keeps the spark contacts farther apart, so that it doesn't jump into more than one one plug at a time.

the new coil, cap, and wires all hook up to the old stock distributor.

Take a look at this dist cap, it's alot larger than the tiny stock one