Mount Pyrometer before of after turbo?

[AllGoodHaywood]

Hi guys I am new to the forum and new to Cummins world, I have an 05' 2500 4x4 QC Cummins. After reading all the posts I decided to bite the bullet and buy a Volant air intake (quite happy with the fit and finnish), MBRP exhaust, and an Edge Juice w/ attitude. The Edge arrives this morning and I am going to attemp to install it. My question is where to mount the Pyrometer? The dealer I bought this from etrdiesel in TN says to mount post turbo (so you dont mess with the maifold) and then set the attitude to 900 degrees as opposed to 1350. This makes sense to me but I wanted to confirm before I did the install. Also I have the air intake installed but my catback MRBP has not arrived yet, any words of caution on setting the attitude to level 4 or 5 with the stock exhaust? Will I blow something?



One more Question whats the Hot Juice?



ps Jeff at http://www.etrdieselperformance.com/ has been great, His prices were very good and he answered all of my lame questions with patience.



Thanks for any replies,



Allgoodhaywood

 

[JFaughn]

I can only help you with the pyo. ? it would seem that most are mounting before , the only thing that I've read is if you mnt. after then you need to remember , when your foot is in it that you need to take your foot out of it a couple 100deg. sooner becouse the over heat range[1250] is at the hottist spot and if you choose not to put it there then your foot needs to remeber.

 

[BILLUA]

Haywood, you could do it that way ( post turbo ) it has been shown in studies that the EGT differences between pre and post turbo can be as much as 500 degrees! With that said, I believe that it is most important to put the instrument at the point closest to that of which you want to monitor. That would be in the exhaust manifold. Then you can set your attitude to a limit of 1300 f and run all day long. After all, with a modified truck, you need to be more concerned about the 8,000 dollar engine with the 1200 dollar turbo secondary... . That takes the guessing game out of the EGT difference pre and post turbo...





The advantages to post turbo are: easier installation and a more accurate reading for engine shutdown. The engine egt's cool down faster than the turbo, so the post turbo pyro is a better indicator of the turbo temp which is what you are looking for at shutdown.



With all that being said, it is your truck and I hope I explained this well enough for you to make the decision.



There are plenty of threads on here about pre turbo pyro install. It is not difficult at all. It just takes about 30 minutes longer to do.



Cheers, Bill

 

[rbattelle]

I would generally advise that in the case of running fueling boxes you should go pre-turbo.



-Ryan

 

[Diesel Nut]

Preturbo! Real easy. Get your tap (pipe tap) and your drill size and a magnet. Put the magnet next to the area you are going to drill on the manifold and remember to use cutting oil on the drill bit. Drill out your hole, the magnet should catch the majority of the chips. Then, lubricate the tap with cutting fluid and tap out the manifold, but don't go too far through. If you have a scribe or small peen magnet you can stick it down the hole and pull out some of the chips. Don't worry if you don't, as you crank the motor the exhaust pressure will safely blow out the exhaust housing. No worries about stuff going through the turbo. Should take you less than an hour being your first time, but its not hard. Good luck.



Also - Welcome to the group! Good to see new members!

 

[Parks]

Install the thermocouple pre-turbo. If you install it post turbo you are going to be playing a guessing game.

Also, welcome to the TDR! We are glad you joined.

 

[RMalone]

I concur, pre-turbo. Most of the egt numbers you see posted will be for pre-turbo. On post-turbo you may not have many numbers to compare your own readings against.

 

[KLockliear]

Always pre-turbo.