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Thread: Extra Cubes

  1. #1
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    Default Extra Cubes

    I Have Just stroked my 2007 Yukon Denali 376 to a 418 And need to re-tune for extra Cubes. Where do I Start with the changes in the tune? Stock injectors and fuel system.

  2. #2
    Joe (Moderator) joecar's Avatar
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    Do you have a wideband...?

    Correct VE table (with MAF disabled; CL/LTFT/STFT disabled; use VE units g*K/kPa).

    Should also correct MAF table (with VE disabled; CL/LTFT/STFT disabled).


    Post your stock tune file.


    What HP/TQ are is the engine expected to deliver...? --> need to calculate injector size from this.
    What rpm is engine expected to spin up to...?
    What transmission will it drive...?


    I take it you have supporting mods (valvetrain, headers, crank pulley/damper, etc).

  3. #3
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    Default Adjusting tune for extra cubes l92 376 stroked to 418

    I have innovation lc-1 O2 sensors installed in each bank.

    I had a stock engine, with a comp cam 156-403 vvt cam installed, stock injectors, ported l92 heads, with comp valve springs and push rods, 1 7/8 kooks long tube headers (catless) and used EFI live to tune it in roughly so I could drive it south to get it professionally tuned. I put 60000 km on it and really enjoyed it. I Cracked a piston crown on the outside ring land.

    So now everything is forged, weisco pistons, dished -10cc, 4" stroker crank over bored to 4.085" with new dart ls3 heads(68cc combustion camber), stock thickness head gasket for 4.085" and dart valve train, comp lifters, comp push rods, same cam set up, yella terra rockers 1:7 ratio, High volume oil pump, ported stock throttle body, TCI high stall torque converter(2200rpm stall), pro flow mass Air, stock intake and injectors and fuel pump (future plan is for 2.3l whipple supercharger with light boost) static compression ratio is 10.5. rings are gapped for boost.

  4. #4
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    Shooting for 550 hp at the crank before boost.


    Thanks for the quick response, Joe.

    PS. I am rusty with my tune skills, I have not touched efi live since 2013 and have only done so because of necessity, no tuner up here in Ft.McMurray, nearest tuner is 3 hours south.
    Last edited by ARC; March 7th, 2016 at 01:47 PM.

  5. #5
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    Default Adjusting tune for extra cubes l92 376 stroked to 418

    I plan on reving it to 7200 RPM, and I am running the stock transmission which is a 6l80e, with the AWD system.

  6. #6
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    I tried to attach the original tune that I was playing with in 2013.

  7. #7
    Joe (Moderator) joecar's Avatar
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    Hey ARC,

    Do you have tge LC-1's daisy chained to the V2 serial port...?

  8. #8
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by ARC View Post
    I tried to attach the original tune that I was playing with in 2013.
    yes, please see if you can post it.

  9. #9
    Joe (Moderator) joecar's Avatar
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    Your V2 firmware probaby needs to be updated (by updating V7/V8 software).


    What year/model/vehicle...?

  10. #10
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    Quote Originally Posted by joecar View Post
    Your V2 firmware probaby needs to be updated (by updating V7/V8 software).


    What year/model/vehicle...?
    It's a 2007 GMC Yukon Denali originally had a 6.2l now stroked to 6.8l.


    I can't remember how the LC1 are wired in but I have the gear in a box in the garage. I had the truck tuned professionally but have a second ecm for my Efi live tune.( tuner locked the original ecm so I can't mess with his tune). It starts and idles nice but I assume that it would run lean if I stepped on it. It's a 5 hour drive to the tuners garage.

    Do you think that it would be okay to drive if I drive cautiously to get south?

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