Tone ring mod = MPG gain



This mod is free for the 3rd gens other than a little bit of time under the truck, I did the mod on a 04.5 and have noticed a better grunt on the lower end and well as .7 mpg gain. The truck is now getting 21.4 MPG highway at 65 mph. So heres the deal: Basically, it is doing about the same thing as the RokkTech Cam sensor by advancing the timing 2 maybe 3 degrees. Behind the Crank Pulley for the serpentine belt there is a Tone Ring. It has 4 bolt holes and a dowel pin hole. Take off the belt, loosen up the crank pulley and remove, the tone ring will then slide off. Now you will see the tone ring has the 4 bolt holes and an alignment pin, use a Dremel tool or a good round file and remove about an eighth inch off the left side of the hole as you look at the front of the tone ring, don't worry about taking too much off and the 4 bolts will only allow the tone ring to adjust so far. Now reinstall the tone ring and the belt sheave and finger tight the 4 bolts, install serpentine belt and make sure it is clear of the crank position sensor as it is a close tolerance . Now with the bolts just finger tight rotate the tone ring in a clock wise rotation as far as it will go...........this is looking at the FRONT of the motor. Secure the 4 bolts to 30ft.lbs. plus another 60 degrees per manual ( weird I know) or do like I did and just tighten the **** out of them. So the end result is you just advanced your timing about 2 or 3*. This mod is very simple to do and well worth the time, If you have a manual tranny it will be easy to do the bolts, if you have an auto tranny you will need a hammer to loosen them so the motor just doesn't rotate. Also check the bolt torque again after a week or so.



Tools needed
15mm socket and breaker bar or ratchet long handle.
hammer if auto tranny
dremmel tool or good small round file
1/2" ratchet for the belt tensioner


I have attached a couple photos of before and after on the tone ring


Stock tone ring


Modded tone ring

 

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Good one.

 

this mod is free for the takin.........not that hard so dont let it intimadate ya.


it is also easily reversable if needed

 

free mods are the best mods!

 

Curious about how this is reversible, also...what exactly does the tone ring do?

 

easy to reverse........simply loosen the 4 mounting bolts and turn the tone ring back to OEM setting and tighten the bolts back down

the tone ring just tells the crank sensor where its at so it can set the timing

 

Ok...I'm dumb...I didn't really understand the concept at first but I got it now I think...

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What if any are the side-effects of doing this?

 

tone ring has nubbins that the sensor reads as the crank turns and sends signal to ECM where timing is controled or set

in a nut shell we are basically rotating the tone ring to falsify the timing so the ECM will adjust for us

 

Whats the site for this??