Pyro pre or post turbo??

[KHarrower]

I plan to install a boost and pyro gauge. Where should I install the pyro probe, exhaust manifold or after turbo?? I am currently looking at ISSPRO or Autometer gauges, any recommendations. Thanks.

 

[Forrest Nearing]

pre-turbo as always

 

[Matt400]

Ditto

 

[dpuckett]

Throw in some altitude, and the "rules" for adjusting the pre vs post turbo go right out the window, or tailpipe, take yer pick. I had a 450 deg difference between post and pre turbo on my current rig; at only 18 psi boost. So much for the 300deg, or add 10deg per lb of boost. More like 15 deg, but can you really be sure?



If something causes the tip to break off, you have bigger issues than taking out the turbo; ditto on chunks taking it out.



Daniel

 

[Jeremiah]

Choices, choices

It depends on whether you want to monitor the health of your engine or health of the turbo. Most of the power shops I know recommend hot side installation (pre-turbo). That's also helpful for those of us who don't like math

 

[bmoeller]

Mines pre. Responds MUCH faster than post.



I have the Isspro R607T pyro. http://dieselpage.com/iss25.htm Works great.

 

[rweis]

I put in both and ran them for a year. Took out the post to free up for a different gauge.



If only one I would recommend pre and cool it down to 300* before shutdown. Keep the oil from cokeing.



Bob Weos

 

[Wiredawg]

Both, one gauge

I installed both on my 3500 to dbl pole/dbl throw mini switch to a single gausge. I run on pre and cool down on post.



Wiredawg

 

[ben_ak]

I have a IssPro Turbo Temp Monitor that uses a post turbo probe for shut down... I can't tell you how many times I have to explain why the truck is still running when the key is out and I'm walking away. But, as mentioned above, if you really want to see what your engine is doing, you need a pre turbo probe.





-Ben

 

[College Cummins]

I would defintely go with pre-turbo. I have the westach gauges and am very pleased with them and got them relatively cheap I'd say. I got the boost, fp (electric), and EGT for 220, and then found the A-pillar used off of the TDR for 25 already painted to match my truck. Sorry, I have no experience with use of the Auto Meter or Isspro. James

 

[dremelts]

If you do decide to go pre-turbo you do have to be careful to not get any drill chips in the turbo. I disconnected my turbo from the manifold and blocked off the turbo intake when I drilled/tapped my manifold. Then, with the turbo intake still blocked, I fired up the engine to blow any chips out of the manifold.



You can do a search on this topic and you will find lots of info. Many will say that they use grease on the drill/tap to keep the chips from getting into the manifold. Others use a small magnet to fish any chips out of the manifold. Maybe I'm just too cautious.

 

[Forrest Nearing]

I would say so... a small chip or two of iron will pass right past the turbine upon fireup and will not do any damage. as long as you are careful on the install, you will not have any problems.



Forrest

 

[Wiredawg]

flexible magnet

Fellas:



Sears makes a great small flexible magnet you can remove all metal with. Also, use lots of bearing grease on the drill bit so metal filings cling to it.



Like I said, I have both on my 3500, but only put pre on my wife's truck.



Wiredawg

 

[nickleinonen]

pre on mine

 

[C. Harlan]

I run post, but would recommend pre. . Just my opinion from what I have learned [the hard way].



-Chris-

 

[RustyJC]

Pre

 

[CFast]

I've never seen a big, over the road truck with a pyro probe PRE- turbo. They always put them post. So that's where I put mine. As far as the turbo being ok after it eats a "chip or two of iron", I sure as hell wouldn't try it on mine. Just take off the 4 nuts holding it on and move it out of the way. It's NOT a blender.

 

[CumminsPower98]

Pre and post on single gauge with stitch. Drilled with magnetized/greased bit and went fishing with magnet. Done four trucks this way, very easy and no problems. Any little flake that might be left is blown out before the turbo even moves.

 

[SMorneau]

If only one, Pre. (turbos are cheaper than pistons?)



But, I have seen 300 on my Pre while my post is still much higher and it can take awhile for the post to come down. So the pre isn't the best for watching cool down.

 

[Turbo Tim 1]

Originally posted by charlan

I run post, but would recommend pre. . Just my opinion from what I have learned [the hard way].



-Chris-

I remember not too long ago being in one of these debates that you were part of, what happened to change your mind? Just curious.