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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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Hey guys Im new to the forums and i have a 96 6.5l turbo diesel gmc, its got a front mount intercooler and i turned up the boost but i would still like to get abit more power from it, i just want to know ... JOIN NOW TO REMOVE TRACER

6.5 turbo upgrade

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Old 03-11-2009, 07:58 AM
_Mitcho_'s Avatar
Diesel Fan

Default 6.5 turbo upgrade

Hey guys

Im new to the forums and i have a 96 6.5l turbo diesel gmc, its got a front mount intercooler and i turned up the boost but i would still like to get abit more power from it, i just want to know if a Holset hx35w turbo would be much of an upgrade for my motor? im going to get the marine injectors, what else do you guys reccommend getting for some decent power?
thanks Mitch
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Old 03-11-2009, 08:19 AM
wildbill's Avatar
Being Twisted In the Wind

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Advance the timing a bit is the only thing that comes to mind right now.

wildbill's Sig:
2006 Ram Cummins

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Old 03-15-2009, 06:24 AM
_Mitcho_'s Avatar
Diesel Fan


will the holset hx35w make any difference over the stock turbo? ill be running marine injectors so whats the max boost can i run my truck at for a daily driver?
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Old 03-28-2009, 06:00 PM
Diesel Enthusiast
the million dollar engine in the 10 cent truck



hopefully you have some headstuds in it or you going to blow a head gasket.
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Old 03-28-2009, 10:26 PM
Woody35's Avatar
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Lovin the KOJO Tune

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right now your truck is making 7-9 PSI max with your stock turbo. check the specs on both turbos and compare the size. if the HX-35 has a similar size it should spool quick enough as stock but make more boost. 15-16 PSI MAX with head studs and heavy duty gaskets is what i would do

Woody35's Sig:1997 Chevy K1500 4X4 EC/SB L56 6.5TD/4L80E
KOJO Tune, GM-8 Turbo gated @ 15 psi, 2100 PSI Pop Pressure Bosch Injectors,
Bosch Duratherm Glowplugs, Steel Braided Oil Cooler Lines,Relocated D-Tech PMD,Tekonsha Voyager Brake Controller
Autometer Gauges, ARP Headstuds, K47 Air Box , Flowmaster Crossover & 4 Inch Diamond Eye Exhaust
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Old 04-01-2009, 11:36 AM
farmboy56's Avatar
Diesel Fan



Check my signature for all my mods. I hit 20psi with a mechanical wastegate on my stock turbo then turned it down to 13 max boost. I am going to rebuild my engine soon and do head studs with oversized gasket and 18:1 compression ratio, along with some other goodies :-)!!!

As far as the holset turbo goes, you ought to make more boost but whether or not it is efficiently, that would require one to look at some Turbo Pressure Maps.

farmboy56's Sig:1993 Chevy 2500 4x4 5sp 6.5TD (Mechanical, not Electronic). 205,000 miles. Pump cranked, Cold air intake, 4in straight exhaust, 3in Down Pipe, 40hp marine injectors, Leveling kit, 32x8.50 Firestones, HO water pump, D-max fan/clutch kit. Mechanical wastegate set to 13psi. Pyro and boost gauges.
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