1994.5 - 1997 7.3L Power Stroke Diesel  

turbo boost preasure?

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  #31  
Old 07-30-2016, 09:07 PM
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17 psi sounds pretty good for stock injectors. By a "load" the way I understand it is if the drivetrain is not engaged there isn't a load... Somebody correct me if I'm wrong though.
 
  #32  
Old 07-30-2016, 10:45 PM
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That EGT probe should of been in either exhaust manifold, you'll get as much as a 300° difference.
Load means your driving your truck around making heat in exhaust to spool the turbo
No load -accelerate in parking/ neutral and there's no heat or air velocity to make the turbo spool.
 

Last edited by z31freakify; 07-31-2016 at 04:43 PM. Reason: stupid spell check
  #33  
Old 07-31-2016, 03:58 PM
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If you are running 1100 degrees with the egt probe in the downpipe, you very well could be asking for problems if not already caused some. Like Adam said above, there could be at least 300 degrees difference between there and the manifold, and you don't want to run over 1250 very long with it in the manifold..
 
  #34  
Old 07-31-2016, 11:34 PM
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You probably need to shut that propane off until you get this sorted out. And after that I would let it off
 
  #35  
Old 08-01-2016, 07:31 PM
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ok guys
This is getting crazy!
Lets assume turbo is working and making up to 17psi at 3000 RPM when truck is pulling a load.
If i keep the propane set mild and my tuner for no more than 50 HP and watch my EGT's am I in any danger to hurting the motor?
Thanks HB
 
  #36  
Old 08-01-2016, 07:40 PM
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Originally Posted by Harleyboy61
ok guys
This is getting crazy!
Lets assume turbo is working and making up to 17psi at 3000 RPM when truck is pulling a load.
If i keep the propane set mild and my tuner for no more than 50 HP and watch my EGT's am I in any danger to hurting the motor?
Thanks HB
What's getting crazy? That about right for a non intercooled intake manifold pressure in a stock tune with 90cc single shots.

I hope I don't make you angry, but have fun with the propane. My previous post was a forewarning. There is a reason no one does it anymore. I give you maybe 3 oil changes before you window a piston running 1100 degrees at the down pipe and adding propane and more fuel on a chip... Best of luck.

Run the chip, get rid of the propane, and put your egt gauge in the manifold.

I will say with propane and a mild tow tune on a stock turbo high 20s to 30 psi is achievable!!! Go for it!
 
  #37  
Old 08-01-2016, 08:59 PM
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Your better of with water method, get rid of the propane you will cause more harm than good.
 
  #38  
Old 08-02-2016, 08:59 AM
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Originally Posted by Harleyboy61
Lets assume turbo is working and making up to 17psi at 3000 RPM when truck is pulling a load.
If i keep the propane set mild and my tuner for no more than 50 HP and watch my EGT's am I in any danger to hurting the motor?
Yes. Propane screws with your timing, I can almost gurantee your timing is already advanced because of your chip, add in propane and your really just guessing at what your timing is. It's just a matter of time before a rod leaves the block....

And move the pyro probe to the manifold, you'll be amazed at how much difference there is.
 
  #39  
Old 08-03-2016, 07:40 PM
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Dose anyone have a picture of where in the exhaust manifold i should move the EGT too
Thanks HB
 
  #40  
Old 08-03-2016, 08:00 PM
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Originally Posted by Harleyboy61
Dose anyone have a picture of where in the exhaust manifold i should move the EGT too
Thanks HB
Most that iv seen were right beside a cylinder. There's no magic location as long as it's in the manifold
 
  #41  
Old 08-03-2016, 08:19 PM
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There is pictures around here someplace. Right in the end at the curve. If you don't feel like shopping Riffraff has the drill and tap on his website.
 
  #42  
Old 08-03-2016, 09:53 PM
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Originally Posted by oldbird1965
There is pictures around here someplace. Right in the end at the curve. If you don't feel like shopping Riffraff has the drill and tap on his website.
Right after manifold in the up pipe where you can drill from below. Just need to get that lil EGT adapter hole made and tapped.
 
  #43  
Old 08-04-2016, 09:06 AM
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It is virtually impossible to drill the up pipe, I did it ONCE....

If you lay under the truck look up at the drivers manifold, there is a nice open spot right in the middle of the bend between the #8 cylinder port and the exhaust donut.

With 2 bits and a tap i can install the probe in 15 minutes.
 
  #44  
Old 08-04-2016, 09:35 AM
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Originally Posted by 444dieselrod
It is virtually impossible to drill the up pipe, I did it ONCE....

If you lay under the truck look up at the drivers manifold, there is a nice open spot right in the middle of the bend between the #8 cylinder port and the exhaust donut.

With 2 bits and a tap i can install the probe in 15 minutes.
Exactly what I did.
 
  #45  
Old 08-04-2016, 10:00 AM
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