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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 11-29-2019, 11:45 PM   #1 (permalink)
Swiftly
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Newbie to 6.5 need advise on new build for proformance and reliability

So I got a really good on a 93 sierra 3500 and I am going to get the engine rebuilt. Since I am doing a rebuild what are somethings I can do to gain some power. I will be mainly using the truck for a camper while towing my race car. It's the mechanical pump and has a overdrive underdrive ? tranny upgrade.
Thanks trev

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Old 11-30-2019, 09:51 AM   #2 (permalink)
OkDually
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Welcome to DieselPlace

The first thing you would need to do is inspect the block carefully for cracks before attempting to do any rebuild.

The best performance mods you can do for the 6.5L is :
Larger intake
Larger exhaust
OEM oil cooler lines changed over to Stainless Braided lines
OPS Relay Mod
Replace/Upgrade Harmonic Balancer and Pulley

For towing:
Cooling System Upgrades ( listed within the FAQ)

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 11-30-2019, 09:40 PM   #3 (permalink)
Swiftly
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Quote:
Originally Posted by OkDually View Post
Welcome to DieselPlace

The first thing you would need to do is inspect the block carefully for cracks before attempting to do any rebuild.

The best performance mods you can do for the 6.5L is :
Larger intake
Larger exhaust
OEM oil cooler lines changed over to Stainless Braided lines
OPS Relay Mod
Replace/Upgrade Harmonic Balancer and Pulley

For towing:
Cooling System Upgrades ( listed within the FAQ)
Thank you
Is there any preferred harmonic balancer to go with. Feed the beast mod beneficial?
And since I will be rebuilding it arp mains and head studs ?
Use the stock head gaskets ?
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Old 11-30-2019, 10:14 PM   #4 (permalink)
OkDually
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Quote:
Originally Posted by Swiftly View Post
Thank you
Is there any preferred harmonic balancer to go with. Feed the beast mod beneficial?
And since I will be rebuilding it arp mains and head studs ?
Use the stock head gaskets ?
You can use the OEM Balancer and Pulley or upgrade to the Fluidampr Balancer and Billet Pulley and never worry about the HB again.

Feed the Beast has little benefit.
ARP Studs are a plus and use Felpro or Victor Reinz head gaskets

Install a K47 intake and a 4" exhaust to let it breathe
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 12-02-2019, 02:27 AM   #5 (permalink)
alex1234
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Quote:
Originally Posted by OkDually View Post
Install a K47 intake and a 4" exhaust to let it breathe



where i can find a K47 air box?

i would need to buy ....never found one available

what i need is the lower and upper shell, without other connector ... but never found one used available for sell

new is impossible (discontinued)
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customized performance eprom, 5521 PDM relocated to front bumber, variable map sensors, gauges boost, pyrometer, oil temp engine and trans, EGR system erased, Aquamist 2 stages water injection, race air cool system, 180 Amp CS-244 alternator, 3.5" downpipe to 4" exaust, 3.73 gear, 33x12.5x16, dual termostat 180 and HO w/p, Evans Heavy Duty Coolant, Flex Fan for very fast spooling/economy, engine and transmission oil radiator relocated with dual electric fan under bump with custom air scoop, 4L80E with HD transgo kit and low rpm torque converter.


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Old 12-02-2019, 09:44 AM   #6 (permalink)
OkDually
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Quote:
Originally Posted by alex1234 View Post
where i can find a K47 air box?

i would need to buy ....never found one available

what i need is the lower and upper shell, without other connector ... but never found one used available for sell

new is impossible (discontinued)
They can be hard to locate but, they are out there..

You have to scour the net and look on sites like Craigslist, car-part.com., eBay, etc..
Walkthrough local junkyards and keep your eyes open here in our Marketplace section.
They do pop up from time to time.

When on the hunt, be sure to find a k47 that is for a Diesel Engine.
The gasser k47 will not work..
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old Today, 12:28 AM   #7 (permalink)
paleyjim
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Power is easy. As with all diesels, more fuel = more power. Put on a bigger injection pump. Conestoga diesel is one source to look at.
Keeping it together once you start putting more fuel to it is the harder part. As mentioned by others, cracks are common in the bottom end. Head cracks are also common. Some can be ignored, some can't.
Open up the exhaust as much as possible. I custom fabbed my complete system out of stainless. Put more fuel to it without opening your exhaust is asking for problems.
If you're going to put more fuel to it, head gaskets get difficult to keep in place. Dropping compression will help. Head studs will help. I also oring-ed my block.
With my electronic injection pump and an automatic trans, I went BIG on my turbo to keep back pressure down. I really only get smoke when I want to (stab the pedal). I don't know how big you can go with the turbine with your mechanical pump. Mechanical pumps seem to like to deliver more fuel at lower RPM - and a big turbo won't want to spool at low RPM. However you may be able to get around that with your transmission and torque converter - make sure you don't lug the engine.
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96 ECLB, T4 S300, Home Built Custom High Output DS4, +0.010 gaskets, Diamond Cups, ARP head studs, FASS pump @ 20 psi, FTB
Custom stainless exhaust: 3.5" DP, 2.5" Crossover - wrapped, 4" DP back.
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