8.1 to dmax 3500 HD GMT-400 body

[malibu795]

stock lb7(300/520) run 5/16 line on the sending unit.. ALL diesel engines use fuel to cool and lubricate parts.
with the steel tank and no bed to hinder airflow around the tank, i dont think it will be much of a problem.

even a detune van engine i dont thing i will have a problem with spinning the tires if i wanted to..

 

[THEFERMANATOR]

stock lb7(300/520) run 5/16 line on the sending unit.. ALL diesel engines use fuel to cool and lubricate parts.
with the steel tank and no bed to hinder airflow around the tank, i dont think it will be much of a problem.

even a detune van engine i dont thing i will have a problem with spinning the tires if i wanted to..

I can assure you that even the stock 01 LB7 used 1/2" feed and 3/8" return line. They do use a short piece of 5/16" after the filter to go from the tee to the CP3, but that's it(and I believe all DURAMAX's use the same section of 5/16" line). Just make sure to put a cooler in the return line before the tank, a good lift pump(like the larger WALBRO that the 6.5 guys are running), and I would put a lift pump warning set-up on it like the CUMMINS guys run so that if you lose fuel pressure a warning light comes on.

 

[malibu795]

I can assure you that even the stock 01 LB7 used 1/2" feed and 3/8" return line. They do use a short piece of 5/16" after the filter to go from the tee to the CP3, but that's it(and I believe all DURAMAX's use the same section of 5/16" line). Just make sure to put a cooler in the return line before the tank, a good lift pump(like the larger WALBRO that the 6.5 guys are running), and I would put a lift pump warning set-up on it like the CUMMINS guys run so that if you lose fuel pressure a warning light comes on.

you forgot about the 5/16" pick up line in the sender as well :thumb:

if i cant maintian rail pressre at 900-1000uS there is something def wrong...

my lb7 maintained 23k at 2000uS with no lift pump.

 

[THEFERMANATOR]

you forgot about the 5/16" pick up line in the sender as well :thumb:

if i cant maintian rail pressre at 900-1000uS there is something def wrong...

my lb7 maintained 23k at 2000uS with no lift pump.

I'm not running a DMAX pick-up, just a 1/2" line straight to the bottom of the tank with a sock on it.

 

[malibu795]

done well basicly its starts and moves on its own now. tranny is in limp mode 2nd/reverse
tach, speedo, OP, ECT need connected got a P2510 code.. out side disabling EGR, VATS i havent touched the stock van tune.. drove the truck to retrive my trailer (8 miles away) i will say that running in 2nd gear the truck moves 10x better then the 6.5 did in 1st with just a 6400lb trailler hooked to the back. the 99 is currently loaded up on the trailer hooked to my 75 headed to the dealer first thing to correct the TCM issue( its brand spanking new, original got compacted by a telephone pole) then go weigh it since pilot scale is just down the road. the custom engine mounts definently transfers more noise and vibration to the frame. im expecting it to with in 150lb of the old weight of 4000/2400

ferm as for the fueling.. im runing through the oem 3/8 5/16 lines with lift pump off i actual rail meets commanded rail pressue.. FWIW

i will post video some time tomorrow..

 

[RPM Motorsports]

Glad to see that it was an easy fix for ya

 

[THEFERMANATOR]

Why are you going to the dealer to flash the TCM? Theres a van TCM file in the library here for an 06 DMAX van.

 

[ChevyDieselLLY]

Glad you got her running, this is why I love this site so many guys doing great things with the duramax.

 

[malibu795]

Why are you going to the dealer to flash the TCM? Theres a van TCM file in the library here for an 06 DMAX van.

cant read or flash tcm.. i have a 06 dmax van tcm file from josh H

 

[malibu795]

got the tcm tuned, got it weighed... gain 30lb on the truck after the swap quite stoked about that part.
working on optimizing the part throttle shift points and TCC engagment speeds.. towed my brother 12klb JLG man lift home.. move much easier power application wise.. aux tranny cooling fan did kick on.. took it 3 minutes at idle to cool then trans fuild down below 180* moving 25k with out the TCC locked in. and hilly winding roads at 40mph. probaly the reason..
i think the oem convertor is little on the loose side.. stalled 1600rpm with the 6.5 closer to 2000rpm now.
then 06 VAN tcm shift firmness is better then the 6.5 stock shift firmness. got rid of the go into N crap when you let of the trottle.. still working on hooking up the speedo tach(wrong alt) OP and ECT which are all now stand alone.
i posted a thread about piggy backing the sensors.. the only one that will be easy is the OP.. i pull a boss plug out of the oil filter/cooler housign and put it there.
ECT im not sure yet.. def want it up by the t-states.. heater core supply line is an option but havent had much luck with one wire electric setup there.

 

[Alaska_AV]

nice:thumb:

 

[emiller3]

Congrats man, that seemed like a nice accomplishment.:thumb:

 

[TheBac]

Adam, check Summit? http://www.summitracing.com/search/Part-Type/Temperature-Sender-Adapter-Fittings/

IIRC, the temp sensor is 3/8" x 18 NPT and the upper hose is 1.8" ID (1.75" adapter would work).

Heck, Russ might even be able to make something for you.

What is the issue with the speedo? Old one gear driven? I found some info to vendors here: http://ls1tech.com/forums/conversio...-electronic-mechanical-speedo-conversion.html

 

[malibu795]

Adam, check Summit? http://www.summitracing.com/search/Part-Type/Temperature-Sender-Adapter-Fittings/

IIRC, the temp sensor is 3/8" x 18 NPT and the upper hose is 1.8" ID (1.75" adapter would work).

Heck, Russ might even be able to make something for you.

What is the issue with the speedo? Old one gear driven? I found some info to vendors here: http://ls1tech.com/forums/conversio...-electronic-mechanical-speedo-conversion.html

i ran across the autometer stuff last night.... the sender that runs the dash guage is 1/2 npt and the snedor that runs the OP is 80 bucks..
speed o old and new is electric. from what the guy said with the harness all i need is a 40t reluctor mounted on the driveshaft..i got a pigtail that he made will connect to the speed sensors on the tranny.
basicly im going to unplug the tcm OPS which will put it into limp mode. plug the speedo in to see if it works.. according to TCI i can run the two in parrallel

 

[THEFERMANATOR]

Your over thinking the speedo. Use the ECM output from the ECM to run the speedo, and then you can adjust it with EFILIVE to fine tune it if needs be. The output speed sensor should be split and go to both the ECM and TCM if it is anything like the LB7/LLY wiring, and then the ECM will have a speedo output for the cluster. Otherwise just tap youre old VSSB wires into the trans output speed sensor wires(pretty sure ALL 6.5's still used a VSSB for speedo calculations).

 

[duratothemax]

Your over thinking the speedo. Use the ECM output from the ECM to run the speedo, and then you can adjust it with EFILIVE to fine tune it if needs be. The output speed sensor should be split and go to both the ECM and TCM if it is anything like the LB7/LLY wiring, and then the ECM will have a speedo output for the cluster. Otherwise just tap youre old VSSB wires into the trans output speed sensor wires(pretty sure ALL 6.5's still used a VSSB for speedo calculations).

Thats not how the LB7/LLY wiring worked.

On all duramax's ever since the beginning, the output speed sensor wiring goes straight to the TCM, and to the TCM only! Then the TCM turns the raw AC signal into a 128k pulse/mile 1-wire signal and fowards that to the ECM. Then the ECM does the speedometer calculations and turns that 128k ppm signal into something that the cluster and the ABS module can use. Then the ECM has 2 separate "finalized/calculated VSS" outputs...one goes to the cluster, the other to the ABS.

LBZ was the same.

LMM is also the same (speed sensor ---> TCM, TCM generates replicated speed signal ---> ECM, ECM calculates actual speed and sends to ABS and cluster), except the VSS signal from the ECM to the instrument cluster is over the databus

 

[malibu795]

its not that easy or it would be done..hopefully he left the VSSB wired in the harness. the pigtail pull the raw VSS signal and run that..
the GMT400 run of a 4kppm on the auto and 8k for the manual usually..
this is the dash guage lay out for a GMT400 truck

this is the 06 dmax van
just little different

 

[duratothemax]

The ECM will still have the proper "old fashioned" VSS output though, even though the van speedometer in a factory application is via class 2 data.

 

[malibu795]

hmm ecm pinnouts both connectors

only VSS pin is #54 on the C2 unless i missed it is that the one it should use of VSS signal?
CC is C-1 #10(r/a), #34(s/c), #61 on

 

[THEFERMANATOR]

Thats not how the LB7/LLY wiring worked.

On all duramax's ever since the beginning, the output speed sensor wiring goes straight to the TCM, and to the TCM only! Then the TCM turns the raw AC signal into a 128k pulse/mile 1-wire signal and fowards that to the ECM. Then the ECM does the speedometer calculations and turns that 128k ppm signal into something that the cluster and the ABS module can use. Then the ECM has 2 separate "finalized/calculated VSS" outputs...one goes to the cluster, the other to the ABS.

LBZ was the same.

LMM is also the same (speed sensor ---> TCM, TCM generates replicated speed signal ---> ECM, ECM calculates actual speed and sends to ABS and cluster), except the VSS signal from the ECM to the instrument cluster is over the databus

I'm 99% certain I tried it when I did my swap without a TCM and I still had the speedo. The diagrams also show circuits 821 and 822(the OSS wires) as going to the ECM and TCM because I remember that I started to splice my VSSB inline for my speedo but decided that I didn't want that signal going to 3 things so I tried the ECM outputs for my speedo and ABS(which ended up working). As for the BOSCH outputs, in the truck it is pin 42 of the C2 plug(circuit 817) for the standard 2K PPM output. I don't know if teh van will be the same or not htough as I remember pussow said he had to repin quite a bit of stuff to run a truck OS and ALLISON TCM from his van set-up.