Does anybody else think the LML with a full delete exhaust (including downpipe) with an H&S tuner (in my case the Black Maxx) sounds sort of weird at idle? I assume it has something to do with the orientation of the turbo veins, but my rig just has a very loud "hiss" at the tailpipe at idle. It doesn't actually sound like a turbo when it's spooling, it's a different noise. I'll try to capture a video later, but it's not the best sound. Every now and again the veins cycle (or something else changes) and the exhaust note turns to a nice, deep big block "glug glug glug" type sound (please excuse my poor phonetic description).

I'd love if the tuner could command the turbo to whatever position makes the healthy "old school" sound at idle at all times, rather than the odd hiss. Anybody else experience this? H&S?

-TJ

http://www.dieselplace.com/forum/showthread.php?t=427207&highlight=

Sounds like you might have the same thing going on. I would get a hold of H&S and see if they got it figured out yet. If you read through the thread it has something to do with the truck being stuck in regen

Oh and i fully agree I wish H&S could do the same thing as Edge Evo and tune out the hiss at idle. The rumble sounds awesome at idle IMO

Im still working with HS to figure it out.... I will keep my thread updated once we have a fix! I now of several other people on this board that are having the same issue.
OP- Are your running DPF delete with the tuner on HOT?

Thanks for all the responses and help folks! I was down in Pismo for the weekend, so I'm just getting back to this now. H&S responded to me on the "other" board so I'm about to email them and work on a new tune to change the sound, I'll keep you posted.

-TJ

Any news on this from your end? I was told the next update after 6.6.10 should have a fix. However, I was the next release was "imminent", and that was about month ago....

Any news on this from your end? I was told the next update after 6.6.10 should have a fix. However, I was the next release was "imminent", and that was about month ago....

Bentley at H&S has been really responsive via email and keeping me in the loop (great customer service). He's found a few ways to control the turbo vanes at idle which are not usable for a final tune and reports it sounds "MEAN" when he commands the vanes to 15% closed (rather than the 97% closed it is now). Again, those methods are not usable for a drivable tune. He's still working on a usable solution.

-TJ

Bentley at H&S has been really responsive via email and keeping me in the loop (great customer service). He's found a few ways to control the turbo vanes at idle which are not usable for a final tune and reports it sounds "MEAN" when he commands the vanes to 15% closed (rather than the 97% closed it is now). Again, those methods are not usable for a drivable tune. He's still working on a usable solution.

-TJ

That would be great if he could tune out the hiss at idle and keep the rumble:cool:

I agree the rumble is AWESOME when it lasts (3 seconds). I have lost contact with Bentley at HS over the last month.... I hope we all see a fix soon though...

I wish we could also get a fix for the cruise control/speed limiter thing plus shift on the fly tuning would be nice too.

X2.... That would be nice. Maybe in time.... Right now I'm just glad to get rid of the DPF/UREA crap....

Will be following this closely, I have the same sound and I hate it!

Ok, now that my blood pressure is up after posting on another thread I figured I would ask a question on here related to all of those running the MM with full delete exhaust...
Has anyone with the hiss problem noticed your EGT's increasing over time? Mine have slowly increased since I installed the Mini Maxx and full exhaust from mid 1400's at WOT to 2200 under WOT? Anyone else noticed this also???? I have brought this to HS attention however, I don't really think I was heard.....
I know that shit starts to melt at 2200 degrees. Not a good feeling for me with no warranty left, and a $10,000.00 motor... HS???

I have not noticed this at all. My egt's are lower than they were stock. Of course I have only run the MM at stock power level.

Ok, now that my blood pressure is up after posting on another thread I figured I would ask a question on here related to all of those running the MM with full delete exhaust...
Has anyone with the hiss problem noticed your EGT's increasing over time? Mine have slowly increased since I installed the Mini Maxx and full exhaust from mid 1400's at WOT to 2200 under WOT? Anyone else noticed this also???? I have brought this to HS attention however, I don't really think I was heard.....
I know that shit starts to melt at 2200 degrees. Not a good feeling for me with no warranty left, and a $10,000.00 motor... HS???

You should not be seeing 2200 degrees EGTs. Are you seeing this consistently or does the max setting on the gauge just show this. There could be a connection issue causing a spike in the readings, or it could be a faulty PCH board. If you have more problems with EGT readings that you think are out of range please give us a call. 888-628-1730. Thanks

You should not be seeing 2200 degrees EGTs. Are you seeing this consistently or does the max setting on the gauge just show this. There could be a connection issue causing a spike in the readings, or it could be a faulty PCH board. If you have more problems with EGT readings that you think are out of range please give us a call. 888-628-1730. Thanks

Yes the EGT's are increasing and I have notified Bentley at HS (about a month ago). They are MAX egt's at WOT. They are consistently increasing on a daily basis and have been since I installed the MM in June. I hit 2221 last night on a max. Day before that I was at 2213 on a max EGT at WOT

Yes the EGT's are increasing and I have notified Bentley at HS (about a month ago). They are MAX egt's at WOT. They are consistently increasing on a daily basis and have been since I installed the MM in June. I hit 2221 last night on a max. Day before that I was at 2213 on a max EGT at WOT

Sounds like a bad Thermocouple or PCH board. Give our tech department a call and they can help you through diagnosis/warranty.

888-628-1730

Thanks.

Yes the EGT's are increasing and I have notified Bentley at HS (about a month ago). They are MAX egt's at WOT. They are consistently increasing on a daily basis and have been since I installed the MM in June. I hit 2221 last night on a max. Day before that I was at 2213 on a max EGT at WOT

I am betting your probe took a Sh!t. I went through about 4 probes on my Edge Inshight.

Well I would hope that is the case... However, I don't think so since I have two and they are both pretty close in temperature...

Sounds like a bad Thermocouple or PCH board. Give our tech department a call and they can help you through diagnosis/warranty.

888-628-1730

Thanks.
Thanks HS... I will call tomorrow!

Here is the latest from HS regarding the problem....
"From your original observations and reports, we were lead to believe something was different with your truck. But after further review, we have found that the symptoms your truck exhibits is normal for the LML Duramax. Thanks for your patience. "
http://www.dieselplace.com/forum/sho...95#post4386595

Here is the latest from HS regarding the problem....
"From your original observations and reports, we were lead to believe something was different with your truck. But after further review, we have found that the symptoms your truck exhibits is normal for the LML Duramax. Thanks for your patience. "
http://www.dieselplace.com/forum/sho...95#post4386595

Strange, I just heard from Bentley @ H&S and they are still "toying" with it but have not found a solution. The correspondence I've had indicates they agree it isn't the desired result and are working on it - but haven't found the right table(s) yet to keep the veins open at idle but still have them operate properly during driving conditions.

I still have my fingers crossed since it sounds MEAN when the veins are open at idle!

-TJ

Will the LML's hold up to higher EGT's or something? I wouldn't continue to do WOT runs if your EGT's are truly that high...That has to be unimaginably hard on things!

Will the LML's hold up to higher EGT's or something? I wouldn't continue to do WOT runs if your EGT's are truly that high...That has to be unimaginably hard on things!
I don't think they will hold any more than any other motor.... I have quit. I will test again when I install a new probe to see if its a probe issue....

Strange, I just heard from Bentley @ H&S and they are still "toying" with it but have not found a solution. The correspondence I've had indicates they agree it isn't the desired result and are working on it - but haven't found the right table(s) yet to keep the veins open at idle but still have them operate properly during driving conditions.

I still have my fingers crossed since it sounds MEAN when the veins are open at idle!

-TJ
This is the second time I have heard from HS that my truck is acting "normal". The problem I have is "why are there a select few" that have the hiss issue? I always hope for the best, however, I don't see a need to reinvent the wheel here when not all LML's are having the same problem.... According to Bentley, (in a personal email) the issue could be swiftly resolved if they had access to an LML with the issue. I kindly offered my hospitality with no luck.... Now, here we are several months later and still no solution....

This is the second time I have heard from HS that my truck is acting "normal". The problem I have is "why are there a select few" that have the hiss issue? I always hope for the best, however, I don't see a need to reinvent the wheel here when not all LML's are having the same problem.... According to Bentley, (in a personal email) the issue could be swiftly resolved if they had access to an LML with the issue. I kindly offered my hospitality with no luck.... Now, here we are several months later and still no solution....

Once again, when we first heard your reports, we were lead to believe that you had something different going on with your truck (based on the information we received). For this reason, we worked with you to further diagnose the symptoms. After digging into the matter, we have found that the "issues" you are seeing are not problems at all, but rather symptoms of the vehicle. We would love to provide you with a modified idle vane position tune. But, this technology has not been developed yet by H&S Performance, or any other tuning company. We are working on a tune to satisfy the desire for those that want a "throaty" exhaust note. But, as with any other reverse engineering project, there is no easy way to put a time constraint on it. It will be available when breakthroughs are made and everything functions as designed. Simple as that.

For now, I suggest that you get your EGT readings addressed as they seem to be inaccurate. This I assume based from your other postings and reports. Please feel free to give the H&S tech line a call and they can work through any product warranty you may need. 888-628-1730.

Thanks!

Is the problem with getting the rumble at idle a tuning issue or a driveability issue? My LMM rumbles at idle and the hiss kicks in as soon as I get obove idle RPM a little ways. I know the LML is a different beast.

Is the problem with getting the rumble at idle a tuning issue or a driveability issue? My LMM rumbles at idle and the hiss kicks in as soon as I get obove idle RPM a little ways. I know the LML is a different beast.

I'm not sure I totally understand your question. The issue is purely about the sound of the truck at idle - which is controlled by the tuning. H&S already sent me a file to get the idle rumble just to check it out, but it is not a proper solution and is not drivable. So in that respect, I guess you could say it is a drivability issue except that H&S stated the tune was NOT for driving ahead of time. The issue is finding the right table/parameters to modify to get the veins to open at idle, but then still cycle as needed once you are driving.

-TJ

Well I wondered if they just couldn't tune in the rumble or if they did tune in the rumble it wasn't drivable with the vanes open at idle. I guess I'm just wondering what's different on the LML that won't allow it to be drivable like my LMM with the rumble at Idle and even a little above idle. H&S just can't control the vanes on the LML as well as EFI could for the LMM?

Well I wondered if they just couldn't tune in the rumble or if they did tune in the rumble it wasn't drivable with the vanes open at idle. I guess I'm just wondering what's different on the LML that won't allow it to be drivable like my LMM with the rumble at Idle and even a little above idle. H&S just can't control the vanes on the LML as well as EFI could for the LMM?
This is a very good point! I have always been fine with a little bit of hiss....

Don't aluminum pistons begin melting at 1220F? Hence the oil jets in the block.

Well I wondered if they just couldn't tune in the rumble or if they did tune in the rumble it wasn't drivable with the vanes open at idle. I guess I'm just wondering what's different on the LML that won't allow it to be drivable like my LMM with the rumble at Idle and even a little above idle. H&S just can't control the vanes on the LML as well as EFI could for the LMM?

Correct, H&S just hasn't found the right tables to properly control the turbo vanes. They can load a tune with them open, but only open, hence not drivable. This is obviously all based on what I understand of the situation, not an official statement from H&S.

-TJ

HS, Anything new to report on a fix for this yet?

I have a 2011 with 5" flo-pro the cat still intact. at idle it makes 0 psi of boost and doesn't have the hiss. it is still on sw1.01.5 tv6.6.1. the 2012 has 5" Turbo back(no cat). it makes 1 psi of boost. this one is on sw1.01.9 tv6.6.16 and it has the annoying hiss. I hate the stupid hissssssssing sound!!!!!

I just updated the mm to 6.6.17 lastnight and it's still there... Not as bad, but still hissing...
Interesting how the different versions will change it.

I have a 2011 with 5" flo-pro the cat still intact. at idle it makes 0 psi of boost and doesn't have the hiss. it is still on sw1.01.5 tv6.6.1. the 2012 has 5" Turbo back(no cat). it makes 1 psi of boost. this one is on sw1.01.9 tv6.6.16 and it has the annoying hiss. I hate the stupid hissssssssing sound!!!!!

The Cat makes a huge difference in sound output from the exhaust. I would be curious to know if your 2011 has the same exhaust note as the '12 if you remove the Cat. Nothing in the tuning versions should be creating differences in turbo vane position at idle.

The Cat makes a huge difference in sound output from the exhaust. I would be curious to know if your 2011 has the same exhaust note as the '12 if you remove the Cat. Nothing in the tuning versions should be creating differences in turbo vane position at idle.

Great! I didnt figure the backpressure would change it that much? The 11 with the cat is quiet, but has a slight rumble and no "hiss". I will swap the exhaust when i get a chance. If that is the case i will just buy another cat-back :rolleyes:

It's all in the turbo. When my turbo veins close just after start up it sounds perfectly fine. Once they open, that's when the hiss starts.

It's all in the turbo. When my turbo veins close just after start up it sounds perfectly fine. Once they open, that's when the hiss starts.

Very true. The turbo is the cause of the original sound. When fully open, it sounds nice and throaty, but when the vanes tighten to spool, it sounds like a jet engine. But it is the modification of the exhaust system that allows this change in air flow to be heard.