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Thread: I bought an Optimizer NAVSTAR

  1. #21
    Join Date
    Jul 2020
    Location
    Montana
    Posts
    227

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    Quote Originally Posted by phantom309 View Post
    Nice build,.. i personally would have put on a better turbo than the GM8,...
    Truck looks great.
    What would you have chosen for a turbo and why?

  2. #22
    Join Date
    Dec 2009
    Location
    In the North
    Posts
    698

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    The cummins style H (holset) turbos push more volume with less drive pressure resulting in a cooler running engine that can handle more power with less problems. You can change exhaust turbine housings on them and tune the turbo to your preference.
    Read up on the different swapped turbo's the GM 8 has a small exhaust turbine and is very inefficient above 2600 rpm-ish
    The latest and greatest is variable pitch turbo, its giving amazing performance and economy best of all worlds.
    1999 chev suburban C2500
    300,000 mi
    1997 tahoe 2dr 4x4 125,000

  3. #23
    Join Date
    Jul 2020
    Location
    Montana
    Posts
    227

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    Quote Originally Posted by DmaxMaverick View Post
    Nice gage selection, but you overshot the boost gage. You need a 15 - 20 PSI max range for the 6.5. I think you'll find the resolution will be way off at 30, which is more than double the potential, and 3 - 4 times your operating range. 30 PSI is more in the rage of late model Diesels.

    Drill the bunghole for the pyro thermocouple in the collector manifold below the turbo, outward. It will sample temps from all cylinders there. Cold bit with NO lube or oil-type coolant (cast iron). Use a good anti-seize for the bushing, and don't overtighten it. If you will be installing it on an installed engine, drill/tap with the engine running at idle to clear the shavings (wear good eye/face protection!!!) An alternative thermocouple location is the downpipe or crossover (clamp-on type). They are easier to install, but less accurate and less immediate. Both would be ideal, being able to track turbo efficiency trends, but that ups the cost and complexity.
    Well, you were right! The points on the boost gauge are bigger then the actual needle so it is difficult to actually determine what the boost really is. I’ll return these gauges and probably go with the Banks.

  4. #24
    Join Date
    Apr 2001
    Location
    CA
    Posts
    12,902

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    I got the Isspro gages from Kennedy. VERY easy to read at a glance, mounted overhead. The Banks gages look about as nice, but I've only seen them in other's trucks on a pillar mount.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  5. #25
    Join Date
    Feb 2000
    Location
    Michigan
    Posts
    363

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    I also like the ISSPro gauges, I have had them on my 1995 for a long time (18 years)
    2016 GMC SLT 2500 CC 4x4 Duramax All Terrain 46K
    1995 GMC 2500 EC 4x4 6.5TD,233K,Custom Tuning,HX40W-II turbo,Amsoil Bypass Filter,KD Exhaust,FSD Cooler,KD Headlight booster,Hi-cap Cooling
    TDP member #14

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