LLY: my custom big twins build

duratothemax

<--- slippery roads
Aug 28, 2006
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Just a geuss, but I'm betting tq control Limit is set to low!

Simon come on im not that smart, but Im not that stupid either. ;) :p: Everything is (and always has been) maxed out to 756ft lbs...

the only thing I have not tried (and will not try) is removing all the TCM defuel. Im not going to try that because we all know how well that worked out for Larry and a few other guys. :eek: I cant even count the number of tunes and crap people have sent me and said "here, this will fix it..." and no, it still does it.

If you want proof, watch some of pat's LSR videos, you can hear it cutting out randomly the same way mine does.

I dont like trying 500 different tunes because for starters, it takes a run from 0-90+mph in order for it to have "the problem". I dont have many places to try this safely, and each run I do I take a risk of blowing something up.
 
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duratothemax

<--- slippery roads
Aug 28, 2006
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What were your EGTs?

with that "bigger than stock" tune on a 0-90mph run, maybe 1150*???

My cruising EGT's are significantly lower than with the MPI twins as well. And after I beat on it, and come down to a stop, the EGT's drop a lot faster. When I go to shut it off, it idles about 100* lower than the MPI twins.

With the old MPI twins I had to actually wait a couple seconds for the EGT's to get below 400* (my 'shutdown' point). With my own twins I dont have to wait, by the time I put it in park its already below 400*.

When I do a WOT run on the "bigger than stock" tune, the EGT's seem to climb faster (than with the MPI twins) until about 1000* where they slow down...

ben
 

HEEPJEEP

<--- Solid Axle "Leveled"
Mar 26, 2009
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I has something in my pocket for you. Be down tonight! I also haz dmax this time instead of the race truck.
 

sweetdiesel

That's better
Aug 6, 2006
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Simon come on im not that smart, but Im not that stupid either. ;) :p: Everything is (and always has been) maxed out to 756ft lbs...

the only thing I have not tried (and will not try) is removing all the

If you want proof

1st off stop putting words in my mouth. You will know when im calling you stupid,ok.
Your problom is not lly specific I have logs that use to do the same thing on my 01.

if you have the tq control maxed out in the table it goes higher than 756lbs but you allready know that,right? Next you will say it doesn't matter that the table goes higher but you have not tried it and won't! As far as shutting off defuel in the tcm ..... What you don't understand hurts you

if you choose to b that way than enjoy the defuels. I done posting in this
thread.
 

duratothemax

<--- slippery roads
Aug 28, 2006
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1st off stop putting words in my mouth. You will know when im calling you stupid,ok.
Your problom is not lly specific I have logs that use to do the same thing on my 01.

if you have the tq control maxed out in the table it goes higher than 756lbs but you allready know that,right? Next you will say it doesn't matter that the table goes higher but you have not tried it and won't! As far as shutting off defuel in the tcm ..... What you don't understand hurts you

if you choose to b that way than enjoy the defuels. I done posting in this
thread.

now how am I supposed to set it higher than 756 ft lbs. As far as the TCM, I understand it simon. I understand it blew up larry's (and a couple other people's) transmissions. Could you explain it better to me?
 

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JoshH

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Feb 14, 2007
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I have a log from an LLY that is from 0 to 88, and I don't see any weird defuel. Can you explain to me when exactly it occurs? Does it only happen on big power trucks? This is a pretty mild tune in an otherwise stock truck.
 
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TrentNell

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Jul 7, 2008
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now how am I supposed to set it higher than 756 ft lbs. As far as the TCM, I understand it simon. I understand it blew up larry's (and a couple other people's) transmissions. Could you explain it better to me?

Ben i know your hesitation on changing the tcm torque table but as the table you posted clearly shows the TCM is requesting a torque reduction right in the area you are complaining about i would at least test it :confused: there inst a race truck out there that hasnt corrected that part of the tcm tune I know my truck has it corrected . but it is a dangerous table and should be treated with respect . I dont care whta is changed in tunning , if you trust the quality of shift and know what it needs to feel like then you will not hurt a thing .
 

JoshH

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Trent, I think that is a stock table. I think Ben was just posted that to show the EFILive maximum limit of 756.
 

sweetdiesel

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Aug 6, 2006
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now how am I supposed to set it higher than 756 ft lbs. As far as the TCM, I understand it simon. I understand it blew up larry's (and a couple other people's) transmissions. Could you explain it better to me?

02 tcm d5196 5197 then tune the ECM properly to accomidate your shifts
 

JoshH

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Ben, I see you think, or at least thought at one time, that the issue is boost related. Did you shut off any overboost codes? Maybe turn them back on and see if they pop up at the same time the problem does. Could be like the 1093 where you can turn the light off, but the truck will still go into limp mode in the event of a FPRV opening.
 
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TrentNell

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I have had good results from 5196 , I NEVER remove the torque reduction request(5197) , but in your case i would maybe try it just to see if it fix's it and decide from there .
 
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duratothemax

<--- slippery roads
Aug 28, 2006
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wow got the boost sensor hooked up last night, the big turbo is certainly working. Makes 35psi on a completely stock tune and when rolling into it/going WOT on the highway in 5th gear with my "not big at all" tune (2050us), it makes 50psi easy. :eek:

I really need a drive pressure gauge...
 

duratothemax

<--- slippery roads
Aug 28, 2006
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ok it runs ok, but the f'ing thing is so quiet. Im talking like stock LLY turbo-whistle quiet. Thats not an exaggeration either. My BD/HTT whistled louder. I still can only barely hear any whistle even if I beat the crap out of it in a tunnel.

I know this is a trivial issue, but its really annoying to me. I pay 900 bucks for this stupid turbo and the damn thing doesnt even make any noise. Why?????

Im seriously considering selling these to dave/heepjeep and taking my old twins back.

:rolleyes:
 
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TrentNell

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Jul 7, 2008
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ok it runs ok, but the f'ing thing is so quiet. Im talking like stock LLY turbo-whistle quiet. Thats not an exaggeration either. My BD/HTT whistled louder. I still can only barely hear any whistle even if I beat the crap out of it in a tunnel.

I know this is a trivial issue, but its really annoying to me. I pay 900 bucks for this stupid turbo and the damn thing doesnt even make any noise.

Im seriously considering selling these to dave/heepjeep and taking my old twins back.

:rolleyes:

Are you Being Serious Ben ? you would sell a more powerful combo of turbo's for more wislte :baby:

Edit , I would still put in a boost gage in the charge pipe to make sure what kind of boost you are seeing out of the second charger .
 
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duratothemax

<--- slippery roads
Aug 28, 2006
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Are you Being Serious Ben ? you would sell a more powerful combo of turbo's for more wislte :baby:

Im dead serious...I dont race the truck anymore because im afraid of blowing up an LBZ piston, I really only did this because I wanted the experience of building them; and what do I have going for it now that Im done, some neat looking pipes and thats about it.

Its not just whistle; its the TWINS whistle. The smooth lower pitched howl is so unique...not at all like a cheetah (which I find totally obnoxious in sound) that has a raspy dentist-drill shriek.

The stock VVT will choke out the S480 if I turned it up anyways...
 
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