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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 Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
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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.
__________________
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 Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
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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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