Search results

Search the forum Search Articles
  1. DAVe3283

    Piston protrusion too small

    OK, so I am just an idiot 😅 At least that means I know how to measure. Just not necessarily how to read...
  2. DAVe3283

    Piston protrusion too small

    I am putting together a near-stock rebuild for my utility bed, and noticed something I think is odd with piston protrusion. The right bank measures 0.006-0.008" protrusion, left measures 0.009-0.010" (±0.0005" with the tools we have). Grade A protrusion spec is 0.0088-0.0108", so the right bank...
  3. DAVe3283

    Paul Vasko's new Dmax RailCar makes its Debut Technical info Thread!

    Heck yes, we want to know all the gory details! Sent from my FlashScan V2 using Tapatalk
  4. DAVe3283

    Quiet today

    Between work and the farm I'm falling behind on the fun projects. I have all the parts to put together the motor for my utility bed, but haven't had the time. Hopefully things will slow down a bit this winter. I've been trying to get that truck going for a couple years now. Even ended up taking...
  5. DAVe3283

    Battery Issues

    I get 4-5 years out of a set of batteries, regardless of brand, chemistry, or price. I now just buy the cheapest batteries I can get (usually AutoZone) and replace them at 4 years. Not worth getting an extra year out of them if I get stranded somewhere.
  6. DAVe3283

    Chevy1925 (James) Truck/motor build

    It's a shame the Wagler aluminum castings had problems at high power levels. I'm running a set (only 790 HP) and they flow great as-cast. But they discontinued them, so I can't use them on the lower power stuff for some easy performance. I was disappointed in the Edelbrock heads too. You...
  7. DAVe3283

    Chevy1925 (James) Truck/motor build

    I have a much higher tolerance for lag than most people, so keep that in mind, but I'd second the S369sxe recommendation. Sent from my FlashScan V2 using Tapatalk
  8. DAVe3283

    Chevy1925 (James) Truck/motor build

    I know the thread you are thinking about, but can't find it for the life of me. We were discussing how to add GMT800 captain's chairs to a vintage truck and keep the heated seat. Simplest way is to just wire the butt and back heaters to a 3 way switch as series/off/parallel which gives you...
  9. DAVe3283

    LLY Ficm

    If I were to speculate, the glitches look like a result of using a threshold on the incoming signal with no hysteresis, so the tiny analog noise on the CKP line cause it to flip back and forth a couple times as the signal transitions. That would imply the ECU is replicating the CKP signal using...
  10. DAVe3283

    sac45 idle

    I had to dial the tune in the Suburban down from my normal because the transmission is a bit weak. It is only semi-built, and if I turned the power up any more than that, it would slip in 2nd gear. Should be pretty straightforward to add a bit of PW / timing at high throttle to hit your power...
  11. DAVe3283

    August '24 Chat -- Its too damn hot!!

    Yeah, how dare he sleep in on the first of the month [emoji38] Sent from my FlashScan V2 using Tapatalk
  12. DAVe3283

    Chevy1925 (James) Truck/motor build

    Really? I have a RoadRunner module I swap between LB7 and 512k and 1MB LS1B PCMs and it's slick. Never had any issues with stability and I've tuned 3 or 4 2003-2005 LS swaps using it. I do wish I could get a 2nd one, and was sad to see them go out of business. Sent from my FlashScan V2 using...
  13. DAVe3283

    MAP sensor scaling Lb7 2002

    It looks like you were entering it as a [email protected] to [email protected], which is relative pressure. Instead use 0 to 600 kPa absolute, which will get you the table I run. Though I recall shifting mine a tiny amount (a fraction of a percent) to get the MAP to match the barometric pressure exactly. It's...
  14. DAVe3283

    To build or not to build?

    I've done studs one at a time with good luck, but at the age of these engines now, and if the previous owner didn't change coolant every 5 years, the head gaskets are likely to be sus anyway. Your plan to do it right is the way to go, you'll not be wondering in the back of your head if the whole...
  15. DAVe3283

    MAP sensor scaling Lb7 2002

    OK, here is the scaling I use for the LOWDOLLER 899006 (6-bar MAP). Looks like I did leave it scaled linearly all the way to 5.0V, but I wouldn't trust any reading above 4.5V to be accurate. Looks like I haven't logged above 500 kPa on the compound setup, but I seem to recall it did on the...
  16. DAVe3283

    MAP sensor scaling Lb7 2002

    Almost all the expected boost tables are a uint8_t (0-255), natively in kPa, so any time your actual MAP measures over 255 kPa (37 PSIA, ~22 PSIG) you will fail the diags. Luckily, GM appears to have written the OS to handle the boost sensor being higher than a uint8_t can represent, and I have...
  17. DAVe3283

    MAP sensor scaling Lb7 2002

    I'll post up the table I use tonight, but I can confirm the lowdoller 6-bar MAP actually reads 0 to 6 bar absolute, and I am 90% sure the 0 bar/0 PSI point is 0.5 V. EFILive / the LB7 operating system expects the table to report absolute pressure. Don't worry too much about what you read on...
  18. DAVe3283

    MAP sensor scaling Lb7 2002

    I'll post it here, I'm not trying to keep it a secret ;) Just have to do it tonight after work, don't have my laptop with me today.
  19. DAVe3283

    MAP sensor scaling Lb7 2002

    The MAP (Manifold Absolute Pressure) sensor reads absolute. Technically it reads kPa natively inside the ECU, but most people have EFILive display it as PSIA. The Baro sensor is just another 1-bar MAP so the truck can compensate for altitude without having to come down to an idle to get a new...
  20. DAVe3283

    Towing speed up 6% grade

    That doesn't sound out of the ballpark, but if you haven't cleaned your cooling stack in a while, it might help. The other thing is if the fan clutch is original, it might be getting weak. I know they are electronic on the LML, but I think they just run a heater to help the fan engage when...
Top Bottom