Aftermarket Waste Gate on a 6.5 Diesel.

RacerM95 · Jun 13, 2024

I question for you diesel guys out there, I am working on a 94 Sierra with 6.5 Diesel. Thinking of putting an upgraded turbo and an aftermarket wastegate, is this doable or do I have to stick with the original set up ? (that adjustable spring setup )

Please let me know,
TIA

L31MaxExpress · Jun 13, 2024

Several companies offer a bolt-on kit to use a wastegated HX35 or 40 on them.

CumminsFever · Jun 14, 2024

The best external wastegate would be put in the crossover tube coming from driver's side manifold. A 40mm gate in that position does work well when paired with bigger turbo. This assumes a tune designed to work with such modifications.

smokymtn65 · Jun 16, 2024

I c

RacerM95 said:
I question for you diesel guys out there, I am working on a 94 Sierra with 6.5 Diesel. Thinking of putting an upgraded turbo and an aftermarket wastegate, is this doable or do I have to stick with the original set up ? (that adjustable spring setup )

Please let me know,
TIA

Cannot remember for sure is that a bd2 or 4 pump. If 2 waste will be fine or 4 and you turn boost up to much it will go in limp mode without at fooler or tune

L31MaxExpress · Jun 16, 2024

At ~21:1, small injectors, and no intercooler the boost one can run is fairly limited anyway.

BNielsen · Jun 16, 2024

L31MaxExpress said:
At ~21:1, small injectors, and no intercooler the boost one can run is fairly limited anyway.

I've seen a max of 10-12 pounds on a factory turbo, but that's pushing it, after 10 the factory turbo doesn't do jacksh_t. The GM8 on my truck is set at 8 pounds with my manual wastegate; I've got an HX35 to swap in.
Allegedly you can run 15 pounds without lifting a head with an HX. I'd like to do an LB7 intercooler and head stud with an HX35/40 hybrid it to see how much I can get out of it then.

RacerM95 said:
I question for you diesel guys out there, I am working on a 94 Sierra with 6.5 Diesel. Thinking of putting an upgraded turbo and an aftermarket wastegate, is this doable or do I have to stick with the original set up ? (that adjustable spring setup )

Please let me know,
TIA

Quadstar Tuning
Leroy Diesel
These two share a lot of the same products, but they do have individual components that only they carry. Zombie Solutions offers a Holset turbo conversion kit as well, that can be found on Ebay.
Most of your aftermarket wastegates are all going to be a spring and bolt type deal.
Without a tune you'll go into limp mode over 10 pounds, your truck being a 94 means you'd be able to get a muti-position tuner from Quadstar, a tune and a turbo swap will wake these trucks up immensely

RacerM95 · Jun 19, 2024

@smokymtn65 Im not sure which pump this thing has. Im still learning

RacerM95 · Jun 19, 2024

@BNielsen , Thank You. Looks like Quadstar is getting a call soon !

smdk2500 · Jun 19, 2024

RacerM95 said:
@smokymtn65 Im not sure which pump this thing has. Im still learning

It should have a DS4 being a 94 unless some one has changed it. This is what a DS4 looks like.

Leroy Diesel

leroydiesel.com

CumminsFever · Jun 19, 2024

The ds4 pump is limited in it's fueling capability, but it'll make the 6.5 run respectable. The quadstar tune and turbo will wake the truck up significantly. 4 inch exhaust is a huge plus too.
For comparison, the quadstar tune and turbo with a 4 inch exhaust will have you running within a vehicle length of a stock 2018 duramax in the 1/4 mile.

Aftermarket Waste Gate on a 6.5 Diesel.

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