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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 04-18-2019, 09:18 AM   #1 (permalink)
steakman
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Questiion: Turbo Exhaust Brake

Heres the deal. I have EFI Live - DSP5...but I dont have the files and its locked.
Do not know if Turbo Brake Function was enabled at the time of tuning. However, I haven't noticed any turbo braking capability whatsoever while hauling my 12,500 lb 5th Wheel through the BC Rockies.

As such:

I've read through a number of these threads. BBaller182's DIY and others. To activate this feature one must do the following.

C2 ECM Connector (the small one)
Add Pin to 53 to switch & then to Gnd.
Add Pin to 11 for Incandescent light to show it's enabled, to Gnd
Both PIN Slots should be Empty-Unused before you start this mod.


If, as I read this, it's only in operation with T/H on & NO Throttle input.....then if one only uses this when hauling a Trailer, 4-6 times a year to go camping, is there any reason to have a switch in the first place.?

Could ya not just go from said Pin 53 to Gnd and leave it on permanently...while maybe adding the light to let you know its activated..? Seems to me thats how the medium duty trucks of the same vintage have it set up.

Love to hear yea or nay.
Acquiring pins today.


Thanx,
Theo

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Orig: Injectors/cp3
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Last edited by steakman; 04-18-2019 at 09:23 AM.
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Old 04-18-2019, 12:56 PM   #2 (permalink)
phat rat
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Is it safe to assume you've tried all 5 settings of the DSP5

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Old 04-18-2019, 05:58 PM   #3 (permalink)
Gunman23
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There are a couple of ways to tell if the turbo brake is on. It should have been set electronically in the tune to come on above 1500 RPMs and at 0% throttle. if you have a data monitor you can see this, the veins on the turbo should close to 90% and you should hear the turbo whistle. there shouldn't be a need to do the pins or mechanical switch it can all be done with a tune. mine is set up this way and it only comes on when in downshifting manually or in tow haul mode.
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Old 04-19-2019, 11:55 AM   #4 (permalink)
steakman
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Quote:
Originally Posted by Gunman23 View Post
There are a couple of ways to tell if the turbo brake is on. It should have been set electronically in the tune to come on above 1500 RPMs and at 0% throttle. if you have a data monitor you can see this, the veins on the turbo should close to 90% and you should hear the turbo whistle. there shouldn't be a need to do the pins or mechanical switch it can all be done with a tune. mine is set up this way and it only comes on when in downshifting manually or in tow haul mode.
i'll check that today...CTS in the Truck.

Tks,
Theo
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06 LBZ CCSB SLE/T
Blanco
(all mods - in my garage),
344,010 miles (553,625km)..
Orig: Injectors/cp3
HG's - ARP Studs: Sep '15..

Pulling a 2003 Canadian Built - Citation 26RKS 5th Wheel

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Old 04-19-2019, 02:58 PM   #5 (permalink)
Dmaxmoe
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It will make boost when turbo brake is active as well. I can’t remember exactly, but I will see around 10 psi at 2500 ish rpm.
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Old 04-20-2019, 12:25 PM   #6 (permalink)
steakman
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So took er out on the freeway.

TH in and in Manual. in 5th.. Truck only.

Got up to 2500 rpm and let off the throttle...I had my CTS showing VPOS and when it kicked in, I did see 98% momentarily and about 6-8lbs of (reverse) boost. Once rpm's went below 2000 - Nadda. I did it a few times smilar results and in both position 2 (Econo Tune) and positon 3 (Tow tune). No difference between the 2. it certainly did not sound like a jake, rather sounded/felt like simply the trans slowing me down would be more like it.

Regardless: To me, these results - what I experienced seem a "light" version of what I am/was expecting to see when I pull my Citation.?? I mean it will help, but hold my truck n 12,500 lb trailer on a 5-7% grade..?? not so sure.

I was hoping for - Wanting something that will REMAIN on or at least a bit longer.? From what I have read of others experience with this: It's supposed to be next thing to the coming of Jesus ffs.! I just dont see that kind of action from what I experienced....? not even close. I do know that if I do in fact have this feature enabled and want to change the parameters of when the Vanes stay Locked up , (say 1700-1900 rpm or so), it would require new programming at $550 CAD.

[B]But[/B, before I go and do something I don't need to. I am going to hook up and test this out on a few hills in my area with the trailer......That will be the one Real Test worth discussing.


We shall see.

Cheers,
Theo
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06 LBZ CCSB SLE/T
Blanco
(all mods - in my garage),
344,010 miles (553,625km)..
Orig: Injectors/cp3
HG's - ARP Studs: Sep '15..

Pulling a 2003 Canadian Built - Citation 26RKS 5th Wheel

Alberta Coal Roller Member Numero Uno


Last edited by steakman; 04-20-2019 at 12:27 PM.
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Old 04-21-2019, 06:50 PM   #7 (permalink)
LBZjunkie
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I wouldn't use mine with no trailer, it is too aggressive. Works great on ours! It will only operate when the torque converter is locked. So no T/H you'll need to be above 45mph and it will stay engaged down to 20 mph, but if you unlock it by just a touch of throttle it will not go back in. In T/H mod it will come in and out under 45mph down to 20 mph. Love ours, works great holds the truck on everything east of the Mississippi. We are about 18k
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Old 04-21-2019, 08:20 PM   #8 (permalink)
steakman
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Well I can tell ya categorically...what I found was not even close to Aggressive...it was for all intents and purposes not really doing anything. Yes VPOS went up to 95-98% but only above 2000 rpm and barely slowed the truck own at all.... I was in T/H and in Manual using 4th & 5th gear.

Im leaning towards the evidence thats telling me it was never activated in my EFI Live programming.

I've asked the question in the EFI live forum....Yet for some reason, not one person has responded when I asked: "Given I have EFI Live, Will i do harm if I manually enable Bballr 182's method of" :

Using PIN 53 on the C2 Connector (ECM) - to a toggle switch - to Gnd
Using PIN 11 on the C2 Connector (ECM) - to incandescent illuminator (small bulb) - to Gnd (to show it is engaged)

I'm thinking that the only way to know is to give this manual mtheod a try and see what happens.

Cheers,
Theo
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06 LBZ CCSB SLE/T
Blanco
(all mods - in my garage),
344,010 miles (553,625km)..
Orig: Injectors/cp3
HG's - ARP Studs: Sep '15..

Pulling a 2003 Canadian Built - Citation 26RKS 5th Wheel

Alberta Coal Roller Member Numero Uno


Last edited by steakman; 04-21-2019 at 08:20 PM.
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Old 04-21-2019, 08:35 PM   #9 (permalink)
Mikey52
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Some have said before that on older trucks it may not work if not in drive.
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Old 04-22-2019, 05:48 PM   #10 (permalink)
Kalimax
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Hey Steakman,

I'll lean towards your assessment in that the braking power is not terribly aggressive. I gave mine it's best tests going down the Grapevine as well as from Mammoth to Bishop here in California, both times towing about 10k. The Grapevine is 6% for 5 miles and I'm not sure of the stats on the Bishop grade but it's also quite aggressive for it's length.

I feel that the braking is very helpful the way it is. I am able to hold my speed without much, if any, braking input from the foot. At first I wasn't convinced that it was working either. But once I really put it to the test on these and other steeper grades, I do see that it really works quite well.

As far as enabling it to work at all times I'd recommend against it. What I am finding is that you can enable the turbo brake when you are not in tow-haul mode and I end up with erratic behaviour. It will brake intermittently (still with no throttle) and lurch around. What I would be interested in would be to see if I could trigger the tow-haul mode to 'on' when I flip on the turbo brake switch.

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