16 Silverado 5.3L mods & tuning help

[Rockstar1]

What's up Guys. Writing this to gain some knowledge from gear heads that are more educated then I am.

I probably did all this backwards but available funds played a role in the sequence of my purchases.

Below is the order and links to all purchased items.

1. Diablo I3 Tuner- https://www.diablosport.com/intune-i3-performance-tuning/  
2. Throttle Body Spacer- https://www.amazon.com/gp/product/B00IBV4K6A/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
3. Cold air intake- https://www.amazon.com/gp/product/B00GP8FKGU/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
4. Performance exhaust- https://www.magnaflow.com/products/12867-performance-muffler-magnaflow-5-round-straight-through-performance-muffler?variant=18434149384307

 

I started off by tuning it with the performance preset tune that is pre installed on the I-3. There is a total of 3 pre installed tunes based on Octane Level. I believe it was ( Eco, Mid, Performance). I set the Tire size + Soft Shift points. I DID not change the Speed limiter or Throttle Limiter. No other changes that were available were made.

At the time is was happy because it basically got rid of the clunk when the transmission would shift at certain times upon quick on and off acceleration moments. Also the throttle response was much better. This was done somewhere around Sep of 2019.

Next up was the Throttle body spacer and cold air intake. Both installed at the same time. At this point it turned into a completely different truck. I believe it cut the 0-60 down by about a second. I did notice hearing a higher amount of back pressure in the motor. It didn't seem to be enough for a concern. Also it seemed to not fall into V4 mode as much as in the past.

Last was the exhaust, I had it professionally installed, They cut the 3rd Catalytic converter out added 2-1/2 pipe to approximately the same OE muffler location added the muffler a Y pipe and dual 2-1/2 pipes to (cowboy cut tips, Not that this matters).

At this point I have to be pretty heavy on the accelerator to take off and its falling into V4 mode constantly. In my opinion exactly opposite when it should be.

I went by a performance shop and asked some questions. they want me to pull the diablo tune and do a custom tune (Pay Me). They also mentioned there is an update for the I3 that allows you to turn off the V4 mode. When the guy connected the tuner in the truck after installing the update on the tuner from his shop PC he mentioned that it was asking for a new license purchase. " He couldn't do anything for me."

I honestly was in to much of a hurry when I did the tune. I didn't really keep up with what all was going on during installing in the vehicle or even if I registered the product. Lesson learned.

 

At this point I have contacted Diablo Sport via email awaiting a response. 

Basically just looking for advice on which way to go at this point. I'm currently on the fence about adding a leveling kit and after market rims and tires. Which in my mind would require another tune.

Thank you ahead of time for any and all that take the time to respond.

     

 

[SeekAndDestroy]

Get a custom tune or learn how to tune it yourself. It will be so much better than the handheld cookie cutter tune

[M1ck3y]

When you remove restriction you're increasing efficiency, when you increase efficiency the engine can operate easier (less load), when the engine is operating in low load conditions, AFM activates. Less restriction = More AFM 

[pokismoki]

you can turn off v4 by manually shifting into 5th gear on the 6l80, for some reason gm likes the restricted exhaust to improve the v4 functionality, i think they want to do this to improve torqe in the powerband

Edited March 22, 2022 by pokismoki