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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 06-19-2010, 12:47 PM   #41 (permalink)
cbr600rx7
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Some times on bolted 6.5s you can see a little boost when reving the engine but it will be very minimal (1-2 psi on a well bolted truck) A boost gauge should tell you just what the turbo is doing under load where it maters. Most of the mechanical injected trucks are only running 4-6 psi stock so dont expect to see any thing crazy.

If power is a problem check out SSdiesel and there down pipe and intake for the 6.5. Add a boost gauge and check out the DIY mods and i think you will see a hole new animal. For about 400 bucks you can wake a 6.5 up a good bit and still get 17+mpg.

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Last edited by cbr600rx7; 06-19-2010 at 12:48 PM.
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Old 06-19-2010, 06:07 PM   #42 (permalink)
mattchatman
Low Boost
 
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Cool that's what I figured. Ill sort out my fuel problem get a boost and fuel pressure gauge and then start with exhaust, cooling, turning up the pump etc. I've an extra 6.5 sitting in my shop out of a 95 and I'm thinking about tearing it down and rebuilding it with better performance in mind, better cooling, lower compression for more boost,a better crank. Any opinions on whether that would be a waste of my time? I know it still wouldn't compare to a Cummins or power stroke but I've got the engine already.

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