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altitude

  1. Jet Boats
    Well, I may take my boat up to Antelope lake in the Northern Sierra at 5000 feet altitude...Do I need to adjust the carb(Lean it out a bit) for that altitude, or will it run ok? I have an Edelbrock 750 on a slightly improved 460 w/Stealth manifold. I normally go up to Trinity at 2370...But...
  2. GN7 On the Dyno
    Does anyone know the formula of how to calculate density altitude. I can't afford one of those weather stations and I just want to put some data on some sheets. Thanks
  3. Jet Boats
    1976 Spectra Daycruiser running a ZZ502 Chevy crate motor with a tunnel ram and 660 center squirter Holleys. Have the carbs jetted with 72s which was ideal at sea level in Virginia. I'm living in Colorado now and thinking about bringing the boat out here. Will I need to change jets in the carbs...
  4. Jet Boats
    taking a daytona to firebird. The boat runs at 4600ft with air anywhere from 6500 to 10000ft. need to know how much plate and nozzle change to make before we leave. the plate is 3* up and nozzle is 2* The boat should run t/e.
  5. GN7 On the Dyno
    Blower Overdrive for Altitude I am running a Littlefield 6-71 with an Enderle Birdcatcher tuned and running great at Irvine Lake on pump gas. I would like my boat to run just as hard at Lake Tahoe as it does at Irvine Lake. I would like to understand how much more I need to overdrive my...
  6. PB Open Water
    Hey guys Is anybody running a 26 Playcraft PowerToon at high altitude with a Bravo 3, Magnum 350 (Big Bear lake California) aproximatly 6500 feet. Im curios as to what pitch propellers you are useing. I have a set that I use at Lake Powell, but Big Bear being about twice as high I though I...
  7. Jet Boats
    trying to get an idea of et gains at sealevel, i know there is a 8 to 10mph gain from N.M. to AZ. but never had clocks to see ET difference. I know there are alot of variables, just looking for an average. My boats runs 7 teens in a 1000ft at 5000ft 100* day. Hoping it will run TE #s
  8. GN7 On the Dyno
    I just got the results back for my Gale Banks TT BBC from the dyno shop in Greeley Colorado. Actually, he left a message yesterday explaining that it didn't produce the 700 to 750 horspower I was excepting. That's because it made 853 HP at 5500 on pump gas! Naturally, I was stoked! After...
  9. GN7 On the Dyno
    I just had a professional engine builder tell me something that I disagree with, so I was hoping to get some input from the motor gurus on here. This is a 510 BBC, 8-71, carbureted, pump gas motor in a 25 eliminator. It runs well at sea level. I am taking it up to lake Tahoe, which is about...
  10. PB Open Water
    I need to buy a prop that will run good at high altitude. Running a 390 cadillac on v-drive flatbottom. Can anyone help with pitch, blades, size, etc... Thanks all
  11. West Coast - South
    Doe's any one with efi that has run this lake notice that ur boat doe's not perform very well ther I have 22 daytona 509 efi with dustin whipple maping/tuning an it runs like sh$%t ther
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