Duramax Diesels Forum Truck of the Week
  #16  
Old 08-31-2009, 03:01 PM
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specialagentPK specialagentPK is offline
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Ahh I didn't know the sticks on an LB7 were bigger so the LB7 ecm would allow more fuel to be injected through the LLY sticks?
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  #17  
Old 08-31-2009, 04:09 PM
KEVINL KEVINL is offline
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What is it about the LLY ECM that makes it suck ding dong
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  #18  
Old 08-31-2009, 04:44 PM
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Quote:
Originally Posted by specialagentPK View Post
Ahh I didn't know the sticks on an LB7 were bigger so the LB7 ecm would allow more fuel to be injected through the LLY sticks?
PW would need to be increased for the LLY sticks. I am just saying the LB7 is easier to tune, so if you had an LLY with a LB7 ecm that would be the ticket. Good injectors, easy to service fuel system.
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  #19  
Old 08-31-2009, 08:56 PM
Hawk355 Hawk355 is offline
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Default My Truck

Ok, this is my truck we are talking about here.

For starters I would like everyone to know that this thread should NOT be about weather or not it can be done, or why one would want to do it, but more "how it was done".

I’ll try to answer some of the simple question now but I don’t have time to go into details at the moment. I will look for the procedures that I wrote up (over a year ago) later this week. Along with posting a few pictures.

I have 35,000 miles currently on this dyno proven 600rwhp daily driver to back up all of my statements.

For those that WONDER WHY: My injectors failed at 160,000 miles and they replaced all of the fuel lines on top of the engine including the fuel rails due to corrosion. This time was under warrenty and it would have cost me over $3,800 if it hadn't been. So if I had put another 160,000 miles or so on the engine they would probably have failed again. But the engine didn’t make it that far, long story short it locked up 25,000 miles later. The block and pistons were scared really badly and I wanted to get the injectors out from under my valve covers for ease of access and safety. The LLY has dry injector cups witch means there is no coolant surrounding the injectors that can leak into the cylinders (this was the cause of my LB7s failure).

1. This LLY is setup like a LB7, NO EGR OR EGR COOLER!!! AND NO VVT

2. I’m using the stock LB7 ECM and FICM

3. The voltage and wire location between the two computers are identical from 2001 to at least 2005

4. The voltage to the Injectors may be different. This is why I’m using the FICM from a LLY (A Bosch engineer told me that all of the injectors that they supply to GM run off of a 12v supply line. He also told me that this engine would never run in my truck! 5 minutes after I got off of the phone with him the truck was running!!)

5. I spent more time studying the wire diagrams on the LB7 and LLY then the time it actually took me to install the engine.

Again I will post the detail later this week when I have time.

Last edited by Kat; 09-05-2009 at 11:29 AM. Reason: Fixed #2
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  #20  
Old 08-31-2009, 08:59 PM
KEVINL KEVINL is offline
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What did you do about the injector wiring splice on the LLY ends?
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  #21  
Old 08-31-2009, 09:02 PM
Hawk355 Hawk355 is offline
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I "unpluged" the injector wires from the LLY harness and "pluged" them into the LB7 harness at the FICM connector. This is very simple if you have the right tools.
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  #22  
Old 08-31-2009, 09:02 PM
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Well even if this it your 1st post but have been lurkin since Feb 2008.
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  #23  
Old 08-31-2009, 09:08 PM
Hawk355 Hawk355 is offline
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Thank you MadMaxx61. I usually do alot of reading on all of the Duramax sites, but I would rather stay out of all of the Political BS so I usually dont bother posting.
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  #24  
Old 08-31-2009, 09:14 PM
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MadMaxx61 MadMaxx61 is offline
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Well it seems like you have some good tech info for us so when you get the time it would be nice to see what you know.
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2008 2500HD 4X4 LTZ Z71 6.6L LMM
Mods: EFILive, MBRP 4" DPF Delete, BD Manifold, SD Manifold, SD Center Link, SD Sleeves, S&B Intake, FS-2500, PPE Trans Pan, Bushwacker fender flares, PPE Oil Centrifuge, And other non-go-fast things.

Things still need to put in: PCV Re-Route,Air Dog AD-200.

1984 GMC Jimmy 2-Door

1998 Buick Century Limited

Sold It will be missed. 1985 Mercedes 300SD - Running still need work.

Sold It will be missed. 1995 C/K 3500 4X4 Dually 6.5L
Mods: K&N air intake, 80Hp chip, 97 cooling, twin fans, #9 Resistor, FSD Heat-Sync, Full Pillar 3 Gauge (EGT, Boost, Transmission),

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  #25  
Old 08-31-2009, 09:19 PM
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Thanks Hawk355 you answered my question as to why. I to this day with about 160k miles on my truck havent had an injector problem and if I do have a GM certified mechanic friend that would help me do the work so I guess it doesn't seem like a big deal to me to do the injectors on mine.

When I asked my question as to why it was simply wondering as to what aspect was so much better about the LLY than the LB7 and I was never thinking about changing injectors as that is not my big worry running big power it is the rods and internal workings of the engine which IIRC are the same.
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Suncoast Stage 4 Tranny & McRat Converter- Special thanks to Mike L.
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FASS 150GPH
530hp and 1000 lb.ft daily driver
Max Dyno 569hp and 1260 lb.ft
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  #26  
Old 09-01-2009, 04:21 AM
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Too cool. Looking forward to hearing how you did this swap.
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  #27  
Old 09-01-2009, 04:36 AM
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me too!! ben and I have talked about this for a while......i guess my new motor is gunna be a LBYZ

i cant wait to hear more from you Hawk, are you using stock sticks or are you using bigger ones? geez, this is awesome to finally have confirmation that this works!!

and
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  #28  
Old 09-01-2009, 05:37 AM
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Sandracer799 Sandracer799 is offline
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Quote:
Originally Posted by Hawk355 View Post
Ok, this is my truck we are talking about here.

For starters I would like everyone to know that this thread should NOT be about weather or not it can be done, or why one would want to do it, but more "how it was done".

I’ll try to answer some of the simple question now but I don’t have time to go into details at the moment. I will look for the procedures that I wrote up (over a year ago) later this week. Along with posting a few pictures.

I have 35,000 miles currently on this dyno proven 600rwhp daily driver to back up all of my statements.

For those that WONDER WHY: My injectors failed at 160,000 miles and they replaced all of the fuel lines on top of the engine including the fuel rails due to corrosion. This time was under warrenty and it would have cost me over $3,800 if it hadn't been. So if I had put another 160,000 miles or so on the engine they would probably have failed again. But the engine didn’t make it that far, long story short it locked up 25,000 miles later. The block and pistons were scared really badly and I wanted to get the injectors out from under my valve covers for ease of access and safety. The LLY has dry injector cups witch means there is no coolant surrounding the injectors that can leak into the cylinders (this was the cause of my LB7s failure).

1. This LLY is setup like a LB7, NO EGR OR EGR COOLER!!! AND NO VVT

2. I’m using the stock LB7 ECM and FICM

3. The voltage and wire location between the two computers are identical from 2001 to at least 2005

4. The voltage to the Injectors may be different. This is why I’m using the FICM from a LLY (A Bosch engineer told me that all of the injectors that they supply to GM run off of a 12v supply line. He also told me that this engine would never run in my truck! 5 minutes after I got off of the phone with him the truck was running!!)

5. I spent more time studying the wire diagrams on the LB7 and LLY then the time it actually took me to install the engine.

Again I will post the detail later this week when I have time.
Thanks for coming in here man and telling them I was not crazy. I will say I was very skeptical when you first told me you had an LLY under the hood.

Then you proved me very wrong. I think it is awesome what you have done with your truck, proving to the community that it can be done.
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Last edited by Kat; 09-05-2009 at 11:30 AM. Reason: Fixed #2
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  #29  
Old 09-01-2009, 05:44 AM
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Cougar281 Cougar281 is offline
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Very cool! Guess my theory was correct I kinda figured that you could do it like that.

Quote:
Originally Posted by Hawk355 View Post
Ok, this is my truck we are talking about here.

For starters I would like everyone to know that this thread should NOT be about weather or not it can be done, or why one would want to do it, but more "how it was done".

I’ll try to answer some of the simple question now but I don’t have time to go into details at the moment. I will look for the procedures that I wrote up (over a year ago) later this week. Along with posting a few pictures.

I have 35,000 miles currently on this dyno proven 600rwhp daily driver to back up all of my statements.

For those that WONDER WHY: My injectors failed at 160,000 miles and they replaced all of the fuel lines on top of the engine including the fuel rails due to corrosion. This time was under warrenty and it would have cost me over $3,800 if it hadn't been. So if I had put another 160,000 miles or so on the engine they would probably have failed again. But the engine didn’t make it that far, long story short it locked up 25,000 miles later. The block and pistons were scared really badly and I wanted to get the injectors out from under my valve covers for ease of access and safety. The LLY has dry injector cups witch means there is no coolant surrounding the injectors that can leak into the cylinders (this was the cause of my LB7s failure).

1. This LLY is setup like a LB7, NO EGR OR EGR COOLER!!! AND NO VVT

2. I’m using the stock LB7 ECM and FICM

3. The voltage and wire location between the two computers are identical from 2001 to at least 2005

4. The voltage to the Injectors may be different. This is why I’m using the FICM from a LLY (A Bosch engineer told me that all of the injectors that they supply to GM run off of a 12v supply line. He also told me that this engine would never run in my truck! 5 minutes after I got off of the phone with him the truck was running!!)

5. I spent more time studying the wire diagrams on the LB7 and LLY then the time it actually took me to install the engine.

Again I will post the detail later this week when I have time.
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Last edited by Kat; 09-05-2009 at 11:30 AM. Reason: Fixed #2
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  #30  
Old 09-01-2009, 06:41 AM
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LB7Diesel LB7Diesel is offline
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Welcome to the site Hawk!! Continue on!
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