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EFILive Tuning Software Discuss custom tuning & data logging the LB7, LLY, LBZ & LMM Duramax engines as well as the Allison transmission with EFILive software.

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Old 09-18-2015, 08:10 PM   #1 (permalink)
Libtekguy
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Read a lot, but still have some questions

I've been reading a lot about EFI Live, and I think I'm going to go this route but I still have a few questions I want definitive answers on. I have an LLY lifted on 35s with a 45 gal Transfer Flow fuel tank. Engine and everything related to it are completely stock. I have corrected the speedometer with a Hypertech calibration so that it reads correctly. The DIC is very optimistic w/ it's MPG ratings. It will read 18 mpg, when in reality I'm getting about 14 or 15. Although the fuel gauge works on a percentage basis (perfectly fine), the DIC isn't aware that it is a 45 gallon tank, not a 26.

1. Can EFI Live correct for tire size changes? (I'm pretty sure this is a yes)
2. Can it modify parameters so that I can get DIC MPG/fuel used more accurate?
3. Can I change fuel tank capacity in the DIC with EFI Live?

I'm hoping the answers are yes to all the above. I'm fairly aware with performance improvements EFI Live can do and I'm excited about the prospects of it.

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Old 09-18-2015, 09:18 PM   #2 (permalink)
TiredFarmer
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I know the guy who was going to put efi live on my LLY was a yes on 1 and 2. Not sure on #3.

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Old 09-18-2015, 10:36 PM   #3 (permalink)
D_R_C
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^^^
On your 3rd question I think it would be a good idea to just contact and ask a EFI tuner.
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Old 09-18-2015, 10:41 PM   #4 (permalink)
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1. Yes to an extent. I believe with 35's you will be fine, but once you go bigger I believe you need a TECH2 to also recalibrate the ABS.
2. Yes and no. If you go with a single position tune, then yes it can be corrected. If you go with a DSP5, then not so much. With a DSP5 tune you have 5 different tunes, but there is only 1 table to correct the DIC, so you can bring it in fairly close, but depending on which tune you run it may still be off.
3. Yes, you can correct the tank sizes. You will have to add in a 2nd sender into the transfer tank, install a transfer pump to move fuel from the transfer tank to the main tank, make sure there is a check valve in the transfer pump so it won't let fuel i nwhen the pump is not on, wire the 2nd sender into the ECM, wire the transfer pump to the ECM, input the 2 tank sizes into the ECM, and convert it to an ECM operating system for a 3500 cab and chassis with factory dual tanks. Then the gauge in the cluster will show how much fuel is remaining total, and the ECM will control the transfer of fuel from the transfer tank to the main tank. It is ALOT of work to do, but CAN be done if you're willing to wire and plumb it all in, and can find a tuner capable of doing the custom segment swaps for the dual tank operation.
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Old 09-19-2015, 06:43 PM   #5 (permalink)
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Quote:
Originally Posted by THEFERMANATOR View Post
1. Yes to an extent. I believe with 35's you will be fine, but once you go bigger I believe you need a TECH2 to also recalibrate the ABS.
2. Yes and no. If you go with a single position tune, then yes it can be corrected. If you go with a DSP5, then not so much. With a DSP5 tune you have 5 different tunes, but there is only 1 table to correct the DIC, so you can bring it in fairly close, but depending on which tune you run it may still be off.
3. Yes, you can correct the tank sizes. You will have to add in a 2nd sender into the transfer tank, install a transfer pump to move fuel from the transfer tank to the main tank, make sure there is a check valve in the transfer pump so it won't let fuel i nwhen the pump is not on, wire the 2nd sender into the ECM, wire the transfer pump to the ECM, input the 2 tank sizes into the ECM, and convert it to an ECM operating system for a 3500 cab and chassis with factory dual tanks. Then the gauge in the cluster will show how much fuel is remaining total, and the ECM will control the transfer of fuel from the transfer tank to the main tank. It is ALOT of work to do, but CAN be done if you're willing to wire and plumb it all in, and can find a tuner capable of doing the custom segment swaps for the dual tank operation.
Thanks for your reply! The tank is actually a mid-ship replacement tank, not an 2nd one.
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Old 09-19-2015, 09:54 PM   #6 (permalink)
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Quote:
Originally Posted by Libtekguy View Post
Thanks for your reply! The tank is actually a mid-ship replacement tank, not an 2nd one.
Then thats ALOT easier. You will need to do a few things to get teh DIC dead on, but it's not that hard to do. Depending on what tank you went with, your tuner might even have the specs for the sender on hand.
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