Im tapping for probe and Bully dog installation kit says( Post Turbo vs. Pre Turbo. Post-turbo mounting is recommended on the Dodge because it is easy to install and provides accurate, safe readings).Also it says to tap it running on pre tubo because it blows the metal back out the hole anyone do this?

 

A lot of people tap them with the engine idling. The ones I've put in, I just taped a shopvac hose up right next to the hole while I drilled and tapped, then ran a small magnet through the hole and picked up all the shavings that fell inside.

 

Drill and tap down from the top where #3 exh joins the manifold. Putting a couple of magnets close to the hole will help keep some of the chips out of the hole while drilling and tapping. When done take a small teloscoping magnet and clean out the bottom of the hole. Works a lot better than trying to work on a running eng and safer to. When drilling make small bit size changes it makes the chips smaller

 

I've done it either running, OR using grease. If you don't want to do it running, this is how I'd do it. Load up a drill bit with axle grease. Drill slowly, and clean and regrease drill bit often. When tapping, grease tap. After every 1-1.5 rotations of the tap, clean and re-grease tap. The grease will catch and hold the metal shavings, which is why it is important to keep the grease fresh on the drill bit and tap.

 

I haven't done this personally, but I am goin' to soon, just waitin' on the funding....but in the research I've done I was seeing NOT to put grease on the drill bit. A drill bit is designed to throw the shavings back, and grease does nothing but hinder that action. (not sayin' either way is right, just sayin' what I've seen)

 

A drill bit is designed to pull the shavings back. However, shavings will fall into the hole once you break through. The grease, holds the shavings.

 

No grease and engine off when I did it. Step drilled using 1/8", 3/8" and 7/16". Then tapped the hole. After that I used a shop vac and a telescoping magnet to get as much as I could and installed the probe. Jumped in the truck and started it up. That was 100,000+ miles ago.

 

Do yourself a favor and tap Pre Turbo not Post turbo if you are only doing one.

I have both and the pre turbo is the one I watch. Reacts faster and is hotter than post. Its the one I watch for shut down.

Ideally do both if you can.

 

Here are my .02...

Put it pre-turbo, it's the most accurate way to monitor EGT's.

Drill with the engine off and cold. Use a sharp drill bit and most the shavings will fall out on the outside. For the few than fall inside put a little shop air into the hole, it will blow most the pieces out the exhaust. Once you have tapped and installed the pyro start the truck. By the time the turbine is spinning at speed to do damge from the small shavings they will all have been blown away.

Do not drill with the engine running for a couple of reasons. It hot for one, the noise is also distracting, and lastly if the drill bit or tap breaks the piece will fall into your turbo, and your change of buying a new one is good.

Do not use grease. Drill bits are desinged to pull shavings out of the hole. Grease doesn't allow for that to happen, so you stand a better chance of a greased up piece of metal falling into the exhaust manifold, especially since the bit is hot and grease doesn't stick to hot metal. So if you do have a greased up piece of metal fall into the hole it will stick to the maniflold, now when you start your truck it will sit there until the manifold is hot enough for the grease to let go, now the turbine is spinning fast enough that damage can occuer to the blade as its struck by metal.

Good luck with the install.

 

Exactly what AH64ID posted...
Been over 30k miles and not a problem...

 

Thanks did it cold no grease and a shopvac pre turbo,no prob
it was simple.

 

Good job...
Simple is usually the best choice...