Is it better to put the sensor after the turbo or before? I know they make all aftermarket downpipes predrilled after the turbo but I was told it should go berfore it??

I'm also looking to lower my EGT's a little, so should I put on a bigger down pipe or go with a cat back system?? Which will lower it more???

Last but not least what are the temps that are dangerous on the pyrometer? and psi on the boost???

 

Pre-turbo is the most accurate location for the gauge. I have mine in the downpipe because I'm too lazy to drill and tap the exhaust manifold.

I'd start with a catback system and see how that works. I have a few customers that are running 5 inch systems and love them. I don't know what all is available on these trucks yet for downpipes.

I seem to remember 1400 being the magic number if the probe is pre-turbo, 1050 post turbo is the limit. your turbo should be rated to handle about 22 psi of boost.

 

Bagstroke - The Auto Meter instruction sheet said on the down pipe 2 " from the turbo outlet. With mine in that location, today the first day driving aropund the top temp reading was 600 Deg at 50 mph and 400 at idle with outside air temperature of 50 deg. All the info I've read says that 1200 deg on the turbo blades will destroy the temper and lead to failure. They say this translates to 900 on the turbo outlet temp. JMorton is correct in saying preturbo is the most accurate because there is a delay in the temperature rise in the after turbo reading. Read everything you can. I have decided that 750 to 800 will make me worry and at 850 I will back out of it until I know more.
I've seen 27 lbs on my boost gage but I think it's bumping up against a governor because it will drop off just before it shifts from 3 to 4th gear. Kind of like hitting a hard rev limiter on a stock mustang. A friend of mine says he gets 34 but I don't know how.
I have a predator set at 65 and a K&N cold air kit which includes a large mass air. I am looking at exhausts also. Very few have a complete system including downpipe. I think it may be against Federal law to remove a cat from a vehicle even if the state doesn't require it. I think I will probably buy a complete 4" system and try to find a 4" cat or splice this one in.

 

I have the predator in mine set at 65hp and I'm getting my turbo up over 25psi (maybe more) when I hammer it. My exhaust is stock except muffler delete..I've been hearing that some of these catback systems are lowering egt's quite a bit..A shop near my house has a downpipe for my truck that is a non-smashed 3.5 to 4 inch..But he thinks that the catback might give me lower temps than just the downpipe??? I'll probably end up doing both..I would like to get a little more sound out of my truck, even after removing the muffler it's not very loud.. You can hear the turbo whistle alot easier thats about it....

 

Click Here to read a post that discusses the placement of the thermocouple.


Hope this helps.

 

I read the posts that DCSpecial referred to and I have one comment. There was a post that said to the effect that it would cause no damage for a thermocuple to break off and go through the turbine. This may be true for a 7.3 and most cummins turbos but not for a 6.0. The turbine housing is one of the most compilcated and fragile components of the 6.0. It is the opening and closing of vanes in the turbine that controls the engine speed like the throttle blade does on other engines. It would be disasterous for anything to go through here. I would not feel comfortable with the shavings from the drill going through the turbine.