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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)
Diesel Boss
Join Date: Dec 2009
Posts: 1,003
iTrader Score: 2 reviews

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.

1994 F350 4x4 ZF-5 7.3 IDI Turbo. (SOLD AND NOT LOOKING BACK)
1993 ext cab 3500 4x4 6.5TD 360,000 (SOLD)
1985 K10 6.2 banks TD (SOLD)
2000 Turbocharged WS6 TA 524rwhp 498Torque (SOLD)
2001 LQ9 IRON 409, T56, 9 inch, 471rwhp 450Torque (SOLD)
2005 GSXR-1300 (SOLD)
2002 2500HD LB7 4x4 (PPE valve, MBRP 4 inch, AFE stage 2, Profab horn, EFI live) (SOLD)
2002 3500 DRW LB7 4X4 ZF6
1985 Toyota PU 4x4, Solid axle, 35 MT's, duel lockers, 5 speed.

Last edited by cbr600rx7; 06-19-2010 at 12:48 PM.
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Old 06-19-2010, 06:07 PM   #42 (permalink)
Low Boost
Join Date: Jun 2008
Location: Poplar Bluff, MO
Posts: 5
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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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