Help - Pre or Post Turbo Pyro?

[sean3073]

What do you people reccomend. Pre turbo or post turbo on a 2002? If it's pre turbo where? Any special tricks to it?

 

[Slow Six]

I went pre turbo on both of my trucks. I went this way as they have both been turned up and I wanted as accurate a reading as possible. This is just my thought on this. I drilled and tapped the manifold where the runners all dump into just before the turbo. Do a search and you should find all kinds of info on this including some excellent pictures as well as a lot of opinions on this. A pyrometer is a must if you are going to bomb.

 

[elandon1201]

I went pre turbo on both of my trucks. I went this way as they have both been turned up and I wanted as accurate a reading as possible. This is just my thought on this. I drilled and tapped the manifold where the runners all dump into just before the turbo. Do a search and you should find all kinds of info on this including some excellent pictures as well as a lot of opinions on this. A pyrometer is a must if you are going to bomb.

DITTO!!!!!!!!!!!!!!!!!!!!11 Oo.

 

[BBRam]

Like they said, Pre for the best reading.

 

[dpuckett]

The only thing post turbo is good for is cooldown on a stock truck. Go preturbo, even if your only BOMB is an aftermarket air filter. You will KNOW your EGT, and not have to account for heat dissipation and load on engine (increased load increases difference between pre and post).



You will need to drill and tap to the front or rear of the divider in the manifold- go dead center, and you drill through a wall, possibly breaking the bit.



Daniel

 

[sean3073]

Thank you guys for the info. Now saying I drill a hole pre turbo, is the best place where the two sides of the exhaust manifold meet?

 

[NoSeeUm]

Thank you guys for the info. Now saying I drill a hole pre turbo, is the best place where the two sides of the exhaust manifold meet?

You must pick one tube or the other. Measure about 1 inch toward the head from the engine side of the turbo flange.



The exhaust manifold is not split and the area between the tubes is solid. One tube dumps from cylinders 6,5,4 and the other dumps 3,2,1. Number 6 is the back cylinder and number 1 is the front. The 6,5,4 tube is able to port to the turbo waste gate.



I drilled a hole for a 1/4 inch sleeve. By sleeve I mean a 1/4 to 1/8 inch NPT piping adaptor. Then I installed the 1/8 inch thermocouple (T/C) into the sleeve. I have put two in so far.



My thinking is that unscrewing the T/C I can leave the sleeve in place. This, I hope, reduces my odds of cross threading the T/C or whatever that goes back in and messing up the threads in the exhaust manifold.



Jim

 

[pwerwagn]

Definitley Pre. I have both and there is a drastic difference between the two locations.

Post turbo, My readings stay fairly safe, not drastically over the "limit". They say 1050* as the limit, and I could maybe hit 1200*.



Yet pre, I have no idea how hot it gets. Well over 1600*. so definitley put it pre if you want to stay safe. Post is really good for nothing other than cooldown.