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6.5/6.2 High Performance Engine Modifications High Performance Turbocharger and Engine Related Modifications Discussion Forum - Specific To The GM 6.2 & 6.5 Diesel Engine.

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Old 12-04-2018, 06:40 AM   #21 (permalink)
guybb3
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The Suburban Club Member

I have 3:42s in the Sub. The tires make a huge difference as well. I have 235/85 with 50-60 psi in mine. Turbo gave me at least 10% when I put it on. I was VERY surprised by that. Everything adds up a little at a time. Getting rid of the drums saved me probably 80 lbs. in rotating mass. Alloy wheels with highway rib tires, instead of the steels (during the summer).

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Old 12-04-2018, 02:58 PM   #22 (permalink)
skylark
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I've hit a handful of "lucky" fill ups with my dually when I was running 235's. I drive VERY conservatively and drive at 62 mph maximum due to mpg falling like a rock above 2200 rpm. Even with the way that I drive most of the time my hwy mpg was upper 16's calculated with gps and the fill to the top method. I'd be happy to maintain that with the Optimizer, cko 40, Alcoa's and 265/75/16's. Time will tell.

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Old 12-05-2018, 03:15 PM   #23 (permalink)
Studentofbudo
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It helped alot with towing. Added about 2-2.5mpg, and keeps my egts in check.

I have 4.10s as well. If you are wanting better mpg, your gonna have go taller (numerically lower) gears... will lower towing ability, but that is honestly, the only way to get better mileage and keep freeway speeds....unless you dont mind cruising 55. Or, the possiblity of a gear vendors purchase....which, may be in my future.. hahaha
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Old 12-06-2018, 03:21 AM   #24 (permalink)
skylark
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Quote:
Originally Posted by Studentofbudo View Post
It helped alot with towing. Added about 2-2.5mpg, and keeps my egts in check.

I have 4.10s as well. If you are wanting better mpg, your gonna have go taller (numerically lower) gears... will lower towing ability, but that is honestly, the only way to get better mileage and keep freeway speeds....unless you dont mind cruising 55. Or, the possiblity of a gear vendors purchase....which, may be in my future.. hahaha
We'll be in your neck of the woods on Saturday night. We're going to Evergreen Aviation Museum on Sunday.
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Old 01-29-2019, 10:41 AM   #25 (permalink)
BowhunterBrown
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So...with a db2 can you turn up the fuel for power when towing, and turn down for daily driving? Adjusting the boost with a manual wastegate to match?

Is it that single to adjust fuel on a db2? Maybe some slight timing adjustment would be needed too?
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Old 01-29-2019, 11:10 AM   #26 (permalink)
dieselsj
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Quote:
Originally Posted by BowhunterBrown View Post
So...with a db2 can you turn up the fuel for power when towing, and turn down for daily driving? Adjusting the boost with a manual wastegate to match?

Is it that single to adjust fuel on a db2? Maybe some slight timing adjustment would be needed too?

Well, yes and no. Remember with a diesel, the accelerator pedal controls your fuel flow. So you can crank up the pump with the adjustment (and you won't want to be doing that often because it is a PITA), and during daily driving you just don't use as much pedal. Basically you tune fuel and boost to get maximum power while keeping EGT's in check then just leave the settings alone.
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Old 01-30-2019, 05:41 PM   #27 (permalink)
BowhunterBrown
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Ok, then what are the different tunes doing on the ds4 pumps? "Economy" vs. "towing" or "performance"? Just timing and shift points?
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4.10, gauges
Holset HX40W turbo with Quadstar WG manual controller and 3" downpipe.
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Heath Towing tune, plus Heath HD lift pump
Heath Waterpump, Fan, fan clutch, and t-stats
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Old 01-31-2019, 01:59 PM   #28 (permalink)
dieselsj
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Quote:
Originally Posted by BowhunterBrown View Post
Ok, then what are the different tunes doing on the ds4 pumps? "Economy" vs. "towing" or "performance"? Just timing and shift points?

The "tune" on a DS4 is basically the same as the fuel screw on a DB2, with the added benefit of being able to tweak timing and shift points. Think of it as tuning EFI vs tuning a carb.
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Old 02-11-2019, 01:44 AM   #29 (permalink)
turbovanman
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Tune, turbo and gearing, simple as that.
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