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Thread: Sensor Warning - Boost PSIG?

  1. #21

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    So maybe my mechanic was onto something? I should have my distributor vacuum plugged into the far right one instead of the far left (the one dead center bottom)?

  2. #22
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    No, the (ported) timed spark port is only for emissions/EGR engines (LINK).
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #23

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    Quote Originally Posted by schweigert
    I should have my distributor vacuum plugged into the far right one instead of the far left (the one dead center bottom)?
    Quote Originally Posted by Danny Cabral View Post
    No, the (ported) timed spark port is only for emissions/EGR engines (LINK).
    Holley quick start manual specifically states on page #4 that the upper right port is for vacuum advance distributors.
    P.S. Danny all those links you provided are toast, they're dead end at a privacy policy.
    Click image for larger version. 

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    Last edited by Zmann; 11-18-2017 at 01:17 PM.

  4. #24
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    Quote Originally Posted by Zmann View Post
    Holley quick start manual specifically states on page #4 that the upper right port is for vacuum advance distributors.
    Yes, it's for vacuum advance canisters on emissions/EGR engines only.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  5. #25

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    Why just EGR engines? That port is where most people hook up their vacuum canister EGR or not, AFAIK?
    EDIT: I do see a reference to the variable here (your links are dead).
    Click image for larger version. 

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    Last edited by Zmann; 11-18-2017 at 02:15 PM.

  6. #26
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    Quote Originally Posted by Zmann View Post
    EDIT: I do see a reference to the variable here (your links were dead).
    Not all the links are dead. I can't possibly update all the links I provide. Those links were active at the time I posted them.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  7. #27

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    Quote Originally Posted by Zmann
    P.S. Danny all those links you provided are toast, they're dead end at a privacy policy.
    I never said you could keep track and update them all. I was simply stating the fact that they are dead, so to post them as reference in the future would be a waste of time on both ends.

  8. #28
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    Thank you for your time, Zmann. (Can we have a phone conversation? If so, click on my username, "View Profile" & "About Me" for my email address.)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  9. #29
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    Quote Originally Posted by Zmann View Post
    Why just EGR engines? That port is where most people hook up their vacuum canister EGR or not, AFAIK?
    EDIT: I do see a reference to the variable here (your links are dead).
    Click image for larger version. 

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    Because you want full vacuum to advance the timing at idle. They introduced ported vacuum so that there is no advance at idle to increase exhaust gas temps. It's kind of a precursor to catalytic converters.
    http://chevellestuff.net/tech/articl...r_manifold.htm, and other numerous links on the internet, including one from a GM engineer who worked with vacuum advance.

  10. #30
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    Quote Originally Posted by bryaneh View Post
    ...and other numerous links on the internet, including one from a GM engineer who worked with vacuum advance.
    Incidentally, that's one of my links that isn't dead (the most informative one).

    Yes, I almost always recommend "full manifold vacuum" for vacuum advance distributors. However, there is an exception: Sometimes a big radical/race camshaft can fluctuate the manifold vacuum too much, and exacerbate an erratic idle. Of course, the entire distributor centrifugal and vacuum advance curve needs to be properly modified. Another benefit of EFI (easily programmed fuel & ignition curves).
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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