Duramax Diesels Forum Truck of the Week
  #16  
Old 08-10-2017, 10:18 PM
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Nate was this an LLY?
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  #17  
Old 08-10-2017, 10:57 PM
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Originally Posted by 2004LB7 View Post
My homebrew tune is maxed out at 2800uS and 32* @ 4800 RPM / 25.5* at 3200 rpm. rips pretty good with just a haze at the top end but get sh!t milage. holds rail pressure good. thought about turning it up a little bit more but I have LMM stock pistons, so i don't.
Mine was 2300 us tune and 28 max timing. They still crack
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  #18  
Old 08-11-2017, 06:27 AM
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Cracked pistons are a crap shoot. My truck hasn't been on a tune less then 2800us 28*(IIRC)in the last 100k. I'm an aggressive driver too.


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  #19  
Old 08-11-2017, 07:10 AM
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Cracked pistons are a crap shoot. My truck hasn't been on a tune less then 2800us 28*(IIRC)in the last 100k. I'm an aggressive driver too.


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Go figure. I'm still debating on a built motor or a junk yard motor and trade, either way it's more money and time than I want to waste.
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  #20  
Old 08-11-2017, 07:17 AM
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Originally Posted by WVRigrat05 View Post
Go figure. I'm still debating on a built motor or a junk yard motor and trade, either way it's more money and time than I want to waste.
You were already looking to sell or trade t either way so I'd just swap in a motor and trade it for something you're more satisfied with
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  #21  
Old 08-11-2017, 07:46 AM
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You were already looking to sell or trade t either way so I'd just swap in a motor and trade it for something you're more satisfied with
I'm never satisfied. The newness wears off within a month and after that I just tolerate it.
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  #22  
Old 08-11-2017, 07:59 AM
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I'm never satisfied. The newness wears off within a month and after that I just tolerate it.
Honestly same here. That's why I usually just get new parts for the truck lol the. I'm excited and don't have to buy a new truck
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  #23  
Old 08-11-2017, 08:21 AM
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Quote:
Originally Posted by WVRigrat05 View Post
Mine was 2300 us tune and 28 max timing. They still crack
28* at 3250rpm or higher?
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  #24  
Old 08-11-2017, 08:56 AM
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28* at 3250rpm or higher?
Don't remember, it's up there in the RPM range though. My tuning was pretty conservative for built trans tunes.
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  #25  
Old 08-11-2017, 09:00 AM
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Quote:
Originally Posted by WVRigrat05 View Post
Don't remember, it's up there in the RPM range though. My tuning was pretty conservative for built trans tunes.
assuming it was 28* on a 2300us at 3250, that is a pretty decent amount of timing for that little shot.
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  #26  
Old 08-11-2017, 09:56 AM
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Quote:
Originally Posted by Chevy1925 View Post
assuming it was 28* on a 2300us at 3250, that is a pretty decent amount of timing for that little shot.


I know what your saying, but the other side of that argument is, no matter how long the pulse is after tdc, the same amount of fuel is injected before tdc..... So if 28* is ok with a 3000 pulse, why not 2300?


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  #27  
Old 08-11-2017, 10:28 AM
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Quote:
Originally Posted by IOWA LLY View Post
I know what your saying, but the other side of that argument is, no matter how long the pulse is after tdc, the same amount of fuel is injected before tdc..... So if 28* is ok with a 3000 pulse, why not 2300?


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true but the flame front is shorter to live than at 3000, plus the reason we HAVE to use 28* at 2800uS and up is due to how long the fuel duration is. less timing drops power out as the spray of fuell continues too far into the down stroke. like mark had shown that a shorter pulse and less timing from larger injectors can net more power and less cyl pressure. So i see it as adding more cyl pressure for diminished returns.

i wasnt saying it cant be done/ran but more of the fact that his tune wasnt any safer than a larger uS tune if that makes sense.
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BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

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back from the dead 7:04pm 4/9/2012

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  #28  
Old 08-12-2017, 12:02 PM
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Keep in mind more fuel will cool cylinder temps some, and push peak cyl. pressure back some. I would run the same timing value with 2300us as i do 3000us.
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  #29  
Old 08-12-2017, 08:53 PM
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Why? There is a substantial difference between a 2300us and a 3000us tune. Unless your really conservative on your timing on a 3000us tune.


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  #30  
Old 08-24-2017, 12:24 PM
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My bad, meant to say "wouldnt"... Dang samsung phone must not be able to understand my Engrish
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