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  1. gmduramax

    L5P programming injector trims with Hp tuners ecm

    Has anyone successfully programmed injector trim codes on a L5P with an Hp tuners ecm? I have a friend's truck that was taken to a shop for a misfire and an injector was replaced and a snap on used to change the trim codes, but they all went to zeros and now will not allow it to be programmed...
  2. gmduramax

    Is a big single turbo right for you

    Little slow at work so I thought I would mention the turbos I've ran if anyone is on the fence about a big single. This is on a LMM stock heads with springs, SoCal 6460 cam. First turbo I ran was a Box stock S475 83 turbine 1.0AR definitely not the stock turbo, the turbo would start to come...
  3. gmduramax

    Not another compound turbo thread

    I need help and maybe some opinions for a small turbo in a compound setup. Atmosphere turbo is a S483 billet 1.15AR on the turbine. And of course, I want 1300hp of air and instant spool. Little back story this is for the Limo, port and polished LB7 turbo in a compound setup with an S483. This...
  4. gmduramax

    Real cold air intake thoughts and discussion

    So im going to make a new intake for my truck but I have questions hopefully someone has the answers lol. Im running a S480 ball bearing double batmowheel with a 87 turbine. I know one air filter isnt enough so I was either going to run two filters or have a custom filter made. I have seen...
  5. gmduramax

    LLY new engine won’t start.

    Well I might need a little help :o I have an 05 LLY and I dropped in a new engine. Callies crank(hopefully it doesn’t eat itself) Carrillos, AF cam, girdle, head studs, main studs, ported heads, 60% overs. I cannot get the truck to start. It cranks over shows rpm on the scan tool. Has fuel...
  6. gmduramax

    2012 LML no start issue

    Have a 2012 LML was working fine. Went to restart after a few hours and nothing. Everything works, windows, lights, etc. I can turn the key on and jump the starter relay and it will start and run. Went to read codes with EFI Live and a code reader and it will not connect to the truck. Going to...
  7. gmduramax

    adjusting driveshaft, pinion angle

    So long story short I lowered the rear of my truck an inch more and I cannot get my driveshaft angles correct. I shimmed the rear of my transmission up and have shims under my axle. So the driveshaft was pointing up then would get to the pinion and I have a 6* angle there. I had a slight...
  8. gmduramax

    S&S street fighter engine dynoed

    What’s everyone think about this? They seem pretty happy according to their instagram posts. Made 1250hp 18xx torque on an engine dyno after 78 runs they cracked a piston. How long is an engine dyno pull 10/20 seconds. So their motor lasted 13-26 minutes at power, very few of those being over...
  9. gmduramax

    Subwoofer under the center console.

    Got tired of my sub taking up space under the back seat and I really don’t put much in my center console so I’m working on this. It’s still a work in progress. For the sub I used a 8” DC audio M38. It sounds amazing but the box ended up bigger than I needed so I cut it down. I believe I can...
  10. gmduramax

    Idea for new members.

    Would it be possible to have a page that pops up when a new member is signing up asking them to use the search function first. And maybe we could come up with the top 10 things commonly asked with links they can click on.
  11. gmduramax

    Fastest L5P

    My dad just picked up an 18 L5P and of course we can't leave anything alone. I was hoping to get it to the track to get a baseline but the rain isn't cooperating. Have something to throw into the trans, picked up a AFE intake, and AFE's plug in module(just fools boost and rail pressure) AFE...
  12. gmduramax

    Lift kit for a 2018

    My dad got a 18 L5P and I wanted to do an actual lift instead of a leveling kit so he can launch it without having to lower his torsion bars. I was looking into a cognito 4-6 but their front shaft can't handle launches from what ive read. And the factory shaft might vibrate if I go over 20mph...
  13. gmduramax

    Mishimoto thermostats

    Has anybody else had problems with their mishimoto thermostats? I bought their regular temp set hoping they would respond quick and they don't. Bought their 185 stats and the temp goes from 185-200 constantly. Ended up going back to 160 degree thermostats.
  14. gmduramax

    Help: Anybody near Gallup NM with a code reader?

    Of course the one time somebody takes my dads truck and I don't send them with a code reader they have a problem :roflmao: pretty sure it threw a turbo code and it sends it straight into reduced engine power. The truck used to do it every time over the grape vine but I thought I fixed it :o is...
  15. gmduramax

    Which turbo should I run?

    I want to run a single turbo, but it needs to spool quick :D Horsepower goal is 1200 to the tires. I was looking at the GTX4508. I've never ran a ball bearing turbo but from what everyone says they spool good. I originally wanted the 4202 but 1000hp just doesn't seem like enough. Am I crazy to...
  16. gmduramax

    Brake upgrades

    Thought I'd make a thread about braking upgrades for 01-10 trucks and I have a few questions as well. I have a 2008 2500. It has braided brake lines, LML hydroboost, napa rotors, and hawk super duty pads. The LML hydroboost made a huge difference with pedal feel and fit a 2004 LB7, a 2005...
  17. gmduramax

    Can't get the turbos to light in a cummins

    So it's an 07 6.7 cummins. It had 120hp industrial injectors (so who knows how big they really were). Dual CP3's. 2400 pulse tune. 66/80mm twins. The truck ran great but was losing a little rail pressure. So it got dual 12mm exergy CP3's and some huge 48LPM injectors. (I was told these injectors...
  18. gmduramax

    Help: In need of a stock tune ASAP

    I'm in need of a stock tune 1GT4K0B6XAF117774 Can anyone help me out? EDIT - Link to factory calibration list by VIN
  19. gmduramax

    LB7: Oil in coolant.

    I have an 04 LB7 with 160,000 miles. Truck runs good, injectors were replaced at 120,000. But now it has oil in the coolant. Upper hose isn't hard after sitting all night. Where could the oil be getting into the coolant?
  20. gmduramax

    Who is good with Photoshop?

    I need something photoshopped. I'd like to get it done quick if possible. Pm me
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