Recent content by L31MaxExpress

  1. L31MaxExpress

    TBI / ECM tuning options. Chip / Burn / etc.

    I did and it is getting swapped to a P59 sooner than later.
  2. L31MaxExpress

    4l60e cooler line/aux cooler

    That is absolutely not how mine was setup from the factory on my 97 Express and 99 Tahoe. Hot fluid entered the top of the radiator on both and exited the bottom. Factory Express van diagram for reference. Fluid flows down from the top to the bottom because it cools the best with the coolest...
  3. L31MaxExpress

    L31 Extreme Budget Build

    Covering the inner door skins on the rear doors with about 85% coverage or so with that butyl sound deadner insulation material made a dramatic difference. Will definitely be using it again in future projects. Greatly reduces the sheet metal rattling common with GMs. I was pounding on them...
  4. L31MaxExpress

    Speed limiter on '91 454 SS ?

    Dwell is time based in a GM ECM and is in Msec. If the minimum dwell time is set too long, the ECM will basically prevent the coil from ever sparking.
  5. L31MaxExpress

    Speed limiter on '91 454 SS ?

    No the dwell is too long. The minimum dwell is too long for the time available at higher rpm, thus acting as a rev-limiter.
  6. L31MaxExpress

    1997 Vortec 5.7 exhaust, shorties CEL

    I actually just noticed trying to find the fitting size for the 454 that the 454 tube is actually being made again.
  7. L31MaxExpress

    1997 Vortec 5.7 exhaust, shorties CEL

    He must be thinking of the 454 tube which is truly NLA. Then again it is the same size as a natural gas supply pipe for a furnace or water heater and a trip to Lowes/Home Depot/ACE Hardware, etc will easily provide a replecement.
  8. L31MaxExpress

    Speed limiter on '91 454 SS ?

    The 1992 299 ECM with ALWD I ran my 83 G20 on would run balls to the wall too. No speed or rev limiter in it. The old 700r4 in that G20 would shift into overdrive at 5,000 rpm and keep on going.
  9. L31MaxExpress

    Speed limiter on '91 454 SS ?

    Going from memory here, BAMY was actually an upgraded Memcal for 91-93 and was installed in some later factory 93 454 SS trucks. It had some tuning corrections to correct problems in earlier calibrations.
  10. L31MaxExpress

    Speed limiter on '91 454 SS ?

    BAMY was a 454SS cal from memory.
  11. L31MaxExpress

    TBI350 to L31 swap. I'm told close to impossible.

    I never ran across one that ran even half way right without tuning the ECM. The exception being the Edelbrock MPFI TBI to Vortec conversion that included a revised chip.
  12. L31MaxExpress

    Speed limiter on '91 454 SS ?

    I believe that to be correct. The 91-92 4L80Es used that ECM for both the 350 and 454.
  13. L31MaxExpress

    Speed limiter on '91 454 SS ?

    https://www.gmt400.com/threads/vortec-black-box-over-5-800-rpm.57523/
  14. L31MaxExpress

    Speed limiter on '91 454 SS ?

    In 91 on the 4L80E trucks.
  15. L31MaxExpress

    Speed limiter on '91 454 SS ?

    At one point it was not known what made the black box act like it had a secondary rev-limit.
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