PRE or POST

[CLAYTON]

Do you run your pyro pre or post... and why?

 

[RankRam]

Pre and the reason for me is accuracy .

 

[timjones]

Ditto: Pre and the reason for me is accuracy

 

[MMeier]

Same here!

 

[Bertram65]

Post, reason being I am interested in the temp of the turbo, if the air I measure is at a safe temp after it has passed through it then the turbo is at a safe temp.

 

[RankRam]

As far as shutdown temp I watch the pre-turbo temp when I'm driving and when it's @ 300 or below I note the time it takes to get to my destination and if it has been three minutes or more I feel comfortable with shutting down.



I think the turbo has to cool within this time frame.



Does this sound right to you?



Of course if I'm loaded I let it idle longer.

 

[rashwor]

Pre. I want to know BEFORE something melts... it is obvious AFTER it melts.

 

[David Muench]

Pre, for accuracy and response time.



As far as the heat of the turbo, I'd rather know about the heat of the engine. The turbo is not that expensive compared to a short block.

 

[Dean Upson]

Pre. Accuracy.



Dean

 

[KLockliear]

Pre. The 03/04 truck use a HY35 w/9cm2 turbine housing. That tiny turbine housing helps keep the hot EGT upstream of the turbo... which is why we see such a large discrepancy in EGT from Pre to Post in these trucks.



Definitely want to see the worst case scenario.

 

[curatchko]

I have it pre-turbo and voted WRONG!!!



So subtract one Post vote.

 

[CLAYTON]

What is the max sustainable egt for pre and post?

 

[JRG]

ALSO, If someone has both; what is the max differance between the 2 have you seen?



JRG

 

[rbattelle]

Post, for monitoring shutdown. But I plan to add a pre-thermocouple later for completeness.



Post temp should not exceed around 900 F sustained.

 

[KevinO]

Everybody that is running pre, has anyone ever heard of one breaking off and shreading the turbo? That is why i went post on my last truck.

 

[Dean Upson]

Originally posted by KevinO

Everybody that is running pre, has anyone ever heard of one breaking off and shreading the turbo? That is why i went post on my last truck.

Never heard of that happening. There was a post awhile back saying that they are pre turbo on airplanes.



Dean

 

[CLAYTON]

Originally posted by rbattelle

Post, for monitoring shutdown. But I plan to add a pre-thermocouple later for completeness.



Post temp should not exceed around 900 F sustained.

Isn't pre turbo not has hot as post turbo?



What temp is melt down territory?:--)

 

[Cooker]

Exhaust gasses pre turbo are hotter than post turbo.

 

[CLAYTON]

Oh. . I thought it was the other way around... So you can hit up to 1400+ pre turbo?

 

[Cooker]

1300 pre turbo is the magic number for sustained runs. There are a ton of guy who blast past that daily in short burst