OK...

I am confused... I just bought the Bully Dog Outlook monitor and it comes with a thermocouple. I have been reading out here on how and where to install it and I have gotten some great instructions, thanks guys, but I am kinda "scared":eek2: to do it myself, so I went this weekend to a diesel shop nearby and asked if they would drill and tap the manifold for me. The guy agreed BUT he asked why I wanted it into the manifold before the turbo, because it would only read half the engine exhaust. He said he would rather put it after the turbo in the exhaust it self so it would read both sides of the engine.

Question 1: Do I want it Pre-Turbo??? My thought would be YES because then I know what temp is going into the turbo.

Question 2: Is the manifold divided and if it is will it matter if I am only reading "half" the engine?

Thanks in advance for the help

Bryan

P.S. Sorry for the long post

Well IMHO I put mine pre-turbo as I want to see how hot the exhaust is that is going into the turbo so you don't damage the turbo and also it is a truer representation of valve heat if you have it in the manifold pre-turbo as you don't want to be damaging the valves and heads as that can be really costly!!!

Is the manifold divided???

well yes as it is a v8 engine. there is one on either side of the engine. they do come together on the back of the turbo, but if you put it on the pass side like everybody else it will be getting only half the engine temp. if your concerned you can put another gauge and probe in the other side of the engine.

Really the EGT on one side should be the same as the other side, within a couple degrees correct?

You would think...

However, the Hoot method places the sensor in direct line of the exhaust port on the rightside, the sensor would see the hotest temps (flame). I would think the temps would be maybe 50 to 100 degrees cooler at the turbo. The PCM receives turbo temp readings, is it exhaust side or intake side or both? Like the others have said side to side temps should be close I would think.

However, the Hoot method places the sensor in direct line of the exhaust port on the rightside, the sensor would see the hotest temps (flame). I would think the temps would be maybe 50 to 100 degrees cooler at the turbo. The PCM receives turbo temp readings, is it exhaust side or intake side or both? Like the others have said side to side temps should be close I would think.

That makes sense to me, so if this is a given are we actually looking at temps that are higher than what should be measured or is this the temp we should be monitoring? I have not seen it discussed before and actually have no idea where the monitoring should take place. It sounds as if GM is using turbo temp and I would think that their egt recommendations would be based on that.

I would like to be more informed on this as it seems to be important for someone who does tow to be armed with the correct info.

Thanks to all that reply,

Tom

I had mine in the down pipe and changed it to the drivers side, I can run a 1100- 1200 when there is a load and if I don't downshift when under a load it will start climbing so that when I downshift, running hypertech on stage 1, before it never get over 1200 even under a heavy load

So passenger's side before the turbo is probably the best place for it?

It is the best location because it's the easiest to access and has a flat spot in the manifold that is almost made for having the thermocouple placed there.

Mounting the thermocouple post-turbo will show EGT's in the neighborhood of 200* cooler than pre-turbo.

passenger side manifold is also the "safest" place to mount a probe..... meaning you'd rather the gauge read a weee bit hotter than the turbo actually ingests, so that the system is working with you not against you. If you mount the the probe post turbo, the heat has already hit the fan.

This is why I like this site...:cool2:

You guys have helped me out tremendously...

Thanks a lot.

You could also get the BD exhaust manifold for the driver's side, it comes with a nice boss on it that is already tapped for a pyro probe, The only problem is the $300.00 price tag.

You could also get the BD exhaust manifold for the driver's side, it comes with a nice boss on it that is already tapped for a pyro probe, The only problem is the $300.00 price tag.
It is abit pricey. Where is the boss located? It would be nice to have it in between cylinders or not directly in front of a port.
I am going to tow my 13K 5th wheel over our mountains this weekend, 6% grade for about 15 miles and topping out at 4400 Ft. then down to the desert so...
I will run the Predator on live data mode and watch the turbo temps from the PCM's point of view and bounce that off of the gauge, to compare the temps.

i just installed this same thing on my dually last thursday it runs about 900 to 1200 under heavy load i install it my self took out the fender well and drilled in the flat part :)

It is abit pricey. Where is the boss located? It would be nice to have it in between cylinders or not directly in front of a port.
I am going to tow my 13K 5th wheel over our mountains this weekend, 6% grade for about 15 miles and topping out at 4400 Ft. then down to the desert so...
I will run the Predator on live data mode and watch the turbo temps from the PCM's point of view and bounce that off of the gauge, to compare the temps.


It's been a while since I installed it, but it looks like it pretty much lines up with the rear exhaust port on the driver's side.

The thing about the Hoot method and measuring the flame is that you can see what temps the top of the piston is seeing, or pretty close. I am not sure what material the pistons are made of (aluminum alloy of some sort?), but if you knew this, then you would have a good idea of the temp that could possibly burn a hole in the top of the piston, and then avoid this not-so-minor problem. Just thinking out loud here, as this is what I have done for my sled so that I do not melt a piston.