2015-2016 LML hiss/rumble idle

[honduh]

MODS feel free to direct me to the correct write-up thread and delete this one if needed. I'm having a hard time finding any info on this.


I am trying to change the 5th position on DSP5 tuning to make it hiss at idle.

I thought the tables I needed to change were Engine Operation > Turbo > Position
-I am editing 600-1200 RPMs and 0-20 MM3s


Client's truck has a goofy inline device connected to the OBD2 port and I'm not sure if it's disabling my changes I'm making with the tune. Any help is appreciated. TIA guys

[Road]

MODS feel free to direct me to the correct write-up thread and delete this one if needed. I'm having a hard time finding any info on this.


I am trying to change the 5th position on DSP5 tuning to make it hiss at idle.

I thought the tables I needed to change were Engine Operation > Turbo > Position
-I am editing 600-1200 RPMs and 0-20 MM3s


Client's truck has a goofy inline device connected to the OBD2 port and I'm not sure if it's disabling my changes I'm making with the tune. Any help is appreciated. TIA guys

Did you increase max limit too?

[honduh]

I did not. I’ll check there next.

Thanks! I AM in the correct tables, correct?

[honduh]

22786

Confirmed min and max were already set.

[GMC-2002-Dmax]

MODS feel free to direct me to the correct write-up thread and delete this one if needed. I'm having a hard time finding any info on this.


I am trying to change the 5th position on DSP5 tuning to make it hiss at idle.

I thought the tables I needed to change were Engine Operation > Turbo > Position
-I am editing 600-1200 RPMs and 0-20 MM3s


Client's truck has a goofy inline device connected to the OBD2 port and I'm not sure if it's disabling my changes I'm making with the tune. Any help is appreciated. TIA guys

The SOTF File or as you are referring to it as DSP5 is not 5 tunes, its one tune with a limiter value applied based on switch voltage.

You cannot make only one of the switch positions rumble or hiss and the others do the opposite.

Its not the way that particular setup works, you can pick one or the other for the tunes.

[honduh]

The SOTF File or as you are referring to it as DSP5 is not 5 tunes, its one tune with a limiter value applied based on switch voltage.

You cannot make only one of the switch positions rumble or hiss and the others do the opposite.

Its not the way that particular setup works, you can pick one or the other for the tunes.

Ahhh I completely forgot about this. So I will need to edit values on ALL low, med, and high altitudes? Do you happen to have a snapshot of the specific tables I need to edit just to ensure I’m doing this correctly?

Thank you!

[GMC-2002-Dmax]

Ahhh I completely forgot about this. So I will need to edit values on ALL low, med, and high altitudes? Do you happen to have a snapshot of the specific tables I need to edit just to ensure I’m doing this correctly?

Thank you!

The editor has most of what you need to make it rumble or hiss @ idle, with respect to, that IIRC there is 6 or 7 single bit values as well as a "idle vane position" only table and 15 or so "max vane pos" tables that are currently missing in the editor and have to be found in hex, identified and a CAX created to see/edit them in the editor.

Most of what you need is in the editor, some trucks will hiss @ idle and then switch to rumble when in reverse or in motion.

Good Luck

[honduh]

The editor has most of what you need to make it rumble or hiss @ idle, with respect to, that IIRC there is 6 or 7 single bit values as well as a "idle vane position" only table and 15 or so "max vane pos" tables that are currently missing in the editor and have to be found in hex, identified and a CAX created to see/edit them in the editor.

Most of what you need is in the editor, some trucks will hiss @ idle and then switch to rumble when in reverse or in motion.

Good Luck

Hey Tony,

I shot you an email. I need a bit more assistance if you are able to help. Thanks!

Bryson

[hoppytruck]

The editor has most of what you need to make it rumble or hiss @ idle, with respect to, that IIRC there is 6 or 7 single bit values as well as a "idle vane position" only table and 15 or so "max vane pos" tables that are currently missing in the editor and have to be found in hex, identified and a CAX created to see/edit them in the editor.

Most of what you need is in the editor, some trucks will hiss @ idle and then switch to rumble when in reverse or in motion.

Good Luck

I know this thread is REALLY OLD AND ROTTEN, but out of curiosity, once things like this are figured out, why are they not added to EFI.

[Omega_5]

I know this thread is REALLY OLD AND ROTTEN, but out of curiosity, once things like this are figured out, why are they not added to EFI.

Usually by the time the community finds these tables, EFI is on to the next controller.
Many of these tables are quite niche, so there is no benefit for them to track them down for every OS.

[Apptruck2020]

I always just change the timing at idle and command turbo closed for exhaust hiss sound. Just my .02

[Lennydmaxguy]

I always just change the timing at idle and command turbo closed for exhaust hiss sound. Just my .02

Getting hiss is easy. What we want to do is open the vanes for rumble at idle. I've never figured out how to do it consistently. I can get them to rumble in reverse, and when rolling, but not in park or in drive sitting still. I've seen what several of the big name tuners change, and I've done the same with no luck.

[Omega_5]

Getting hiss is easy. What we want to do is open the vanes for rumble at idle. I've never figured out how to do it consistently. I can get them to rumble in reverse, and when rolling, but not in park or in drive sitting still. I've seen what several of the big name tuners change, and I've done the same with no luck.

With the tables EFI has exposed, it will still command 35-55% vane, until the main tables take over. It will also cycle in to open loop mode at idle and periodically command 95% vane.
As MSC mentioned, there are an additional 15 tables that need to be modified the same way to get the full rumble effect.