6.6L programmer

L8T · March 18, 2021

Anyone heard any news on a programmer or tuning availability coming yet?

L8T · February 6, 2022

Year later, still nothing.
Thing is don’t even think they need to crack the ecm or be able to flash it to make hp/tq changes. They could go old school like the old edge piggy back systems with sensor foolers and such.

Samuel Martell · February 23, 2023

So I Found a "tuner". Its website is https://www.magnumtuning.com/en/detail/smart-tune-x-performance-fuel-tuner-chip/gm/6-6l-gas-fuel-injection.

It seems like it is a speakeasy website. It seems like we are going through a second prohibition for tuning. I was wondering if anyone has tried to contact them or used their tuners?

Kjduvall · February 23, 2023

no way id use that gizmo tuning thingy, if its not hp tuners or equivilent . really from my understanding its encrypted pcm like the c8 vette. my personal dyno tuner guy says its gunna take a serious amount of time and effort for some one to do it. and he tunes 300 to 4000+ hp cars all the time for a living. so until somebody (cracks it open) its going to be damn near impossible. really sucks too, cause id like to do a tvs 2650 blower/ bigger injectors/ 1 7/8 headers/ true dual all 3in stainless and some e85. but i really dont see it happening.

davester · February 24, 2023

You really can't go wrong with a product where the support for it is described like this "RUSH-RUSH Help Center replaced former Magnum Tech Support"

It appears to not be a tuner, but rather just intercepts various sensors to trick the ecu into putting more fuel into the engine.

Just based off that one web page, it's not a product I would plug into my very expensive truck, even if they paid me to do it.

GMC4Zee · April 22, 2023

This is what I came across. A little pricey but time will tell what gains we can get. https://www.hptuners.com/articles/hp-tuners-continues-to-grow-gm-tuning-support-with-exclusive-e93-ecm-services/?utm_source=rss&utm_medium=rss&utm_campaign=hp-tuners-continues-to-grow-gm-tuning-support-with-exclusive-e93-ecm-services

Mic_ · April 27, 2023

sure

the BBB gives them a F

with multiple complaints

sky google address is a shipping yard

nothing can go wrong...just send you money

Dr1ft3r · April 28, 2023

It seems that Whipple has cracked the ECU.

https://www.gm-trucks.com/forums/topic/262716-l8t-whipple-for-2020-2022-2500hd/

https://gmauthority.com/blog/2023/03/whipple-will-soon-launch-a-gm-6-6l-l8t-v8-supercharger-kit/

"The kit includes an HP Tuners RDT flash tool to reprogram the computer, as well as a VCM scanner for data logging and tire / axle adjustment."

Edited April 28, 2023 by Dr1ft3r

GMC4Zee · March 28

This just out recently. Good news for all:

2020-2023 GM Silverado/Sierra 2500/3500 Truck 6.6L L8T Gas tuning has arrived! DiabloSport has combined their industry exclusive Locksmith device with the required ECM harness, and developed tunes specific to the L8T 6.6L Gas applications. The provided preloaded/preset tunes have shown gains of 28 RWHP and 50 RWTQ over stock, on good 93 octane gas! These are huge gains, that you'll feel when you stomp the go pedal! You can also adjust throttle response, tire size, speed limiter and more!

For those that want numbers thats 429 HP and 514 RWTQ!!! on 93 octane

BCGM · May 21

On 3/27/2024 at 5:18 PM, GMC4Zee said:

This just out recently. Good news for all:

2020-2023 GM Silverado/Sierra 2500/3500 Truck 6.6L L8T Gas tuning has arrived! DiabloSport has combined their industry exclusive Locksmith device with the required ECM harness, and developed tunes specific to the L8T 6.6L Gas applications. The provided preloaded/preset tunes have shown gains of 28 RWHP and 50 RWTQ over stock, on good 93 octane gas! These are huge gains, that you'll feel when you stomp the go pedal! You can also adjust throttle response, tire size, speed limiter and more!

For those that want numbers thats 429 HP and 514 RWTQ!!! on 93 octane

Just curious would this apply to 2024 Chevrolet 2500 HD 6.6 engines ? Also what would change just using regular fuel ?

64BAwagon · May 22

93 octane is at least 75 cents more per gallon anywhere I have been.

Part of the beauty of the L8T is that it runs on 87 regular.

Not to mention the issue with warranty if GM finds you cracked into the ECM (and they will no matter who says otherwise)

But thats just me and I am old and dont like drama.

newdude · May 22

17 hours ago, BCGM said:

Just curious would this apply to 2024 Chevrolet 2500 HD 6.6 engines ? Also what would change just using regular fuel ?

No. 2024's use the GM Global B platform so new ECM and encryption. 2020-2023 are GM Global A.

HP has access for the 1500s 2022.5+current which are also Global B, so I'd imagine they will announce support for 2024+ HD in the near future if they haven't already, so HP Tuners would be the only path I know of so far.

Edited May 22 by newdude

KARNUT · May 22

2 hours ago, 64BAwagon said:

93 octane is at least 75 cents more per gallon anywhere I have been.

Part of the beauty of the L8T is that it runs on 87 regular.

Not to mention the issue with warranty if GM finds you cracked into the ECM (and they will no matter who says otherwise)

But thats just me and I am old and dont like drama.

I did the program thing all the way to my last new truck. I like to feel I had some control. Eliminating top speed governors, backing off the shift nanny, raising shift points and the premium tune. I didn’t pay for gas so let her rip. That sometimes was the minimum but could be done the first weekend along with exhaust. I drove lots of miles so it helped with boredom. My avalanche I’ve done nothing. Not even exhaust it has a little sound. I only average 18 miles a day with it. The exhaust could still happen. If the engine quits, look out. A 400$ hand held tuner, probably not. That’s a first.

BCGM · May 22

4 hours ago, newdude said:

No. 2024's use the GM Global B platform so new ECM and encryption. 2020-2023 are GM Global A.

HP has access for the 1500s 2022.5+current which are also Global B, so I'd imagine they will announce support for 2024+ HD in the near future if they haven't already, so HP Tuners would be the only path I know of so far.

Thank you NewDude !

BCGM · May 22

2 hours ago, KARNUT said:

I did the program thing all the way to my last new truck. I like to feel I had some control. Eliminating top speed governors, backing off the shift nanny, raising shift points and the premium tune. I didn’t pay for gas so let her rip. That sometimes was the minimum but could be done the first weekend along with exhaust. I drove lots of miles so it helped with boredom. My avalanche I’ve done nothing. Not even exhaust it has a little sound. I only average 18 miles a day with it. The exhaust could still happen. If the engine quits, look out. A 400$ hand held tuner, probably not. That’s a first.

Karnut Thank you for the reply ! I'm not sure I understand your last sentence could you explain .

Thanks