1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Star Wheel and Full Power Adjustment

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  #21  
Old 03-31-2011 | 07:55 PM
1989w250's Avatar
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Yuo don't want this to happen
And it will if you turn that screw to far.
 
  #22  
Old 03-31-2011 | 08:03 PM
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buy your self some guages!! this is a must for any truck, stock or upgraded. it is always nice to know how your truck is doing and you need to watch EGT's after turning fuel screw. boost guage is necessary after tuning the star wheel. you dont want to turn it to much and have too much boost which will cause your head studs to fail and an expensive repair.
 
  #23  
Old 04-03-2011 | 07:08 PM
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jdbigblue12v :

Doesn't the stock turbo set up use a waste gate? How would this over-boost condition occur?

On another topic, what is the maximum boost these trucks can generate (or should be generating) with the 3200 governor spring and stock turbo set up?
 
  #24  
Old 04-03-2011 | 07:49 PM
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the stock turbo isnt waste gated on these trucks. the hx35 can put out 35psi or more if i am correct someone will probably correct me but that is what i run at on my truck
 
  #25  
Old 04-03-2011 | 07:56 PM
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im not sure on the max psi but with my stock h1c i max out the 30 psi boost gauge before the pedal even hits the floor. need a bigger gauge
 
  #26  
Old 04-03-2011 | 08:00 PM
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i took out my spring and removed the nylon washer it madea big change but now i have a ton of smoke my mpg's fell off a little i lost like 20 miles on a full tank
 
  #27  
Old 04-03-2011 | 08:14 PM
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i removed the washer but decided against removing the spring, i tow some and didn't want to burn half my tank every time i take off.
 
  #28  
Old 04-03-2011 | 09:27 PM
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Boost is good.
 
  #29  
Old 04-14-2011 | 09:28 PM
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Yea I,am also about 1/2 turn from run away, should I back it off more. Im going to be on a dyno at the end of the month in Snowflake az. I dont want runaway on the dyno.
 
  #30  
Old 07-24-2011 | 09:32 PM
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Originally Posted by JBradley500
be careful with the full power screw. go in 1/2 turn increments (with the truck running) and rev the engine after each increment. If the RPM's dont come back down like normal then you need to stop and turn the screw back out 1/2 turn. if you go too far the engine can rev out of control.
I got a big issue. started out turning the fuel pin. i turned it correctly, no boost leaks, all was well i thought. when i went to test drive it it had no ***. would barely get rpm's to climb... i was told to adjust the full power screw... it got my power and throttle response back but now my idle is too low and wont rev out all the way. any ideas?
 



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