Pre/post Pyro?

[Bandit1]

i know that someone on this board is running dual pyros, i was considering doing the same thing and i wondered how accurate they are compared to only one and any tips needed for the install. thanks

 

[Mundgyver]

How are you planning on mounting them? Pre and post turbo or one on each three cylinders pre turbo. Together in a pre turbo fashion you would be able to watch the front three cylinders seperat from the back three. This might give you some indications when a injector started to have problems. At least you would know where to look. If I were going to run two of them, it would be pre turbo and in the configuration just stated. Good luck with it.

 

[Bandit1]

i already have a post installed, i went post bc that is what i heard was best for turbo cool down after highway travel and that his all i do, but after adding my fuel plate and reading on the tdr i wish i would have went pre. i have a pic of what the configuration looks like if i can figure out how to post on here i will.

 

[Ethdee]

A lot of people run dual thermocouples. I use pre/post myself, and I have a switch next to the gauge for switching between the two.



I just use a mini DPDT switch. As long as the temperature is the same at all the connections at the switch, and the junctions are all the same materials, I don't think it will significantly affect accuracy.



Jim

 

[Champane Flight]

Both

I do believe that pre and post is the way to go. I did one like this for a friend and it turned out pretty good. It is amazing how the temps differ. I would love to put a thermocouple at each cylinder and see how they differ. This would be the ideal setup.



On my friends 96 the pre and post install temps are wildly spread on warm up. But when you get her hot and on a hard pull the temps are 200' to 250' apart. He has a fuel plate and stock exhaust and can only pull 1250 pre and 1150 post. I have a stock 95 and pull 1000 post. I have talked to many, many proffesional diesel mechanics ( including myself ha ha) and 1350' is my limit. However short bursts of 1500' should not hurt. I had a old diesel mech who told me that the temp drop from the back of the turbo is 200' per inch. He told me this years ago. He was not far off.