L76 Suburban tune needed
01-10-2016, 10:39 PM
#1
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L76 Suburban tune needed I need a stock engine and trans tune for a 2007 1/2 ton Suburban 4wd L76 6.0L. Truck tune will not work, nor will a 2008 Suburban tune. 07 Suburban is kind of a bastard. I'm using EFILive. Any help is appreciated.
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Thanks
Last edited by Maxirat427; 01-12-2016 at 09:43 PM.
01-13-2016, 08:07 PM
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L76 Suburban Tune LSX Power Tuning: 07 Suburban does not have fuel system control module. 07 trucks do. 08 Suburbans do. The fuel curves are set up for rail pressure changing with flow demand. Even if I toggle the "FSCM YES or NO" to NO you can tell it is not running just right. There apparently isn't alternate injection mapping so it fuels the same toggled either way. This LC9 to L76 swap has not been so straight forward. Have learned a great deal about the differences in 07-09 Suburbans and Silverados. The original problem I ran into was VVT on L76, none on LC9. Had to build a new harness and pin it in at ECM.
Last edited by Maxirat427; 01-13-2016 at 08:13 PM.
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01-14-2016, 10:00 AM
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That is a project you have on your hands for sure. You are right on the FSCM being different between the years. Changing that to no should work but your going to have to change more than just that single table for it to run right since the tune was based on having it. I have tuned trucks where that was deleted (due to aftermarket fuel system) and didnt have any issues.
01-14-2016, 07:54 PM
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L76 Suburban Tune Has been a project for sure. Every time I thought I had found the last thing keeping it from running right, something else popped up. Was by accident I came across the FSCM issue. Thought, Lord that is it! Now just need to get that dedicated 07 Suburban tune. Trans build was a pain too. They only used that trans in 07 and 08.