altitude

Discussion in 'General Automotive Discussion' started by 392, Apr 27, 2016.

  1. 392

    392 Silver Member

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    I live at 5700 ft. because of altitude I'm only getting 8 lbs of boost. besides doing pullies, is there any way to increase the boost? also I can get no better than 91 oct.....would octane boost help? just wondering.......thanks all.....
     
  2. Cruisin1966

    Cruisin1966 Silver Member

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    No to the octane boost. At best it's temporary bandaid.

    Same issue we have here (elevation: 3400ft; average DA: 5000ft). If you go with a pulley change (one or both), get it tuned, just so it's safe to drive when you venture closer to sea level.
     
  3. 392

    392 Silver Member

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    I think I'm gonna leave it......I don't go to the track, so no point in playing with the pulleys, don't want to void warranty just yet.....
     
  4. Mopar22

    Mopar22 Silver Member

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    Same a you I am only getting 8-9 lbs of boost, the only way to increase your boost is a smaller pulley. Metco just came out with a 3.10 pulley and we could get away with installing this with no tune as its good for about 2 lbs of boost, though as cruisin1966 mentioned if you come down from the mountain you would need it tuned.

    Higher octane and a tune will make you more horsepower. I recently purchased an unlocked PCM and the Diablosport Trinity and ran the diablo 93 octane tune, It's good for what they claim of 30 hp. I went from an 11.4 @ 121 mph to an 11.3 @ 122, then I raised my rev limiter 350 rpm and ran an 11.2 @ 124. So after I bumped up the rev limiter my on dash horsepower went from 600 ish to 648, not sure how accurate that is but it had never went that high before. The tune and octane made me a believer so Josh over at HHP is making me a custom 93 octane tune and race fuel tune for vp 109. I can not get pump 93 octane either so I just get the VP 109 in 5 gallon containers or some Torco and make my own 93 octane.
     
  5. 392

    392 Silver Member

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    I guess it's fast enough for me now......race fuel gets expensive for the street.....
     
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