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Vacuum pump for agressive cams

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  • #1

    Vacuum pump for agressive cams

    O.k....without going into a huge story on my car (its all posted on TSN, which is down right now) I have a 12:1 N/A engine with very agressive cams being run by a MegaSquirt with MSnS-e doing both fuel and spark.. Right now it idles around 500 - 600 PRM, does fine without a load but runs like crap under load. Also overlap on the cams is so high that its pretty much impossible to tune under 2k as a lot of fresh air get through to the exhust and the wide band picks that up as a lean condition when in actuality its just right.

    So I was talking with some V8 power guys who's judgement I trust about my issues and explained everything going on. A couple suggested a vacuum pump for the intake manifold, it would pull vacuum and elleviate some of my lopy idle issues and missing/bogging issues under load. I'm talking to SDA about a set of less agressive cams but that would be in addition to the current setup (I want a sporty daily driver, not just a drag car) so I'm persuinfg all avenues. Anyone ever try one of these? Work out, didnt work? Any experiences?

    -Allan.
    -Allan
    Bought a 2001 Saturn SC2 new, sold it in 2008, bought it back in 2017. I don't know why.

    The carbon-metabolizing physical presence that currently houses my conscious and those physical manifestations of my comrades all possess as our common residential abode the interior of a mid-visible spectrum double hulled buoyancy controlled ship of war!
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  • #2
    Have you tryed adding adv to the spark to increase idle speed and vacuum?

    Also, what are your egt's like at idle. With an egt gauge, you could get another spectrum of data to tune with.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

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    • #3
      Originally posted by TURRRBOOO
      Have you tryed adding adv to the spark to increase idle speed and vacuum?

      Also, what are your egt's like at idle. With an egt gauge, you could get another spectrum of data to tune with.
      There hits a point with adding advance where it starts to backfire. And since its idling so low I usually get a kickback and stall. I hate hearing that kickback and cyl releive resonate throught the AEM...I always feel like its gonna break something.

      And I need to get my EGT working. I built the DIY EGT circuit into the proto area but it requires +12v and all thats in the proto area is +5v. I need to find a decent regulated +12v on the MS board I can tap into and get that displayed. All the other wiring is done and the probe mounted 3" from the head on the #4 runner.
      -Allan
      Bought a 2001 Saturn SC2 new, sold it in 2008, bought it back in 2017. I don't know why.

      The carbon-metabolizing physical presence that currently houses my conscious and those physical manifestations of my comrades all possess as our common residential abode the interior of a mid-visible spectrum double hulled buoyancy controlled ship of war!

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