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#1
06-07-2024, 08:46 PM
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Minimum Cruise control vacuum?
Will a oem cruise control work with a raIV cam and 11 inches vacuum? Thinking of putting one on my 70 GTO. 400 ci.
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 1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Tri power, 4speed, barn find 1966 GTO Ragtop 1969 GTO Judge RA lll, auto 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds Factory stock oval track car |
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#2
06-08-2024, 07:13 AM
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I would put a long hose on a vacuum source and take the car for a drive and see what the vacuum is at light/medium load at 50-60-70 MPH. I assume that's the speeds you would most likely be using the cruise control at. The 11" you report I assume is at idle? If your cruising vacuum is 13 1/2 +" of vacuum, I tend to believe the cruise control system would work. I base this off the vacuum brake booster on my car. The brakes work just fine with 13 1/2" +.
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#3
06-08-2024, 09:50 AM
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Ok, thanks for input, thought someone may know if one could get cruise on a factory IV car or not an option.
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Tri power, 4speed, barn find 1966 GTO Ragtop 1969 GTO Judge RA lll, auto 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds Factory stock oval track car |
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#4
06-10-2024, 12:28 AM
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Since your car won't be correct anyways why don't you get one of the new after market electron cruise controls? I have one and it works great.
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#5
06-10-2024, 01:05 AM
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If you use an older setup, just make sure the servo seals well. You're fine at 11" as long as it holds vacuum well. Mine was a early-mid 70's setup
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#6
09-05-2024, 12:46 AM
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70s devices are actually old now but in terms of quality they are very good, you can refer to poppy playtime chapter 3 to know more about 70s devices
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