Boost puzzler
#1
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Boost puzzler
Ok, I've just finished breaking in my Atkins rebuild. Now I'm ready for some boost. I have been getting 3 psi but that was fine for break in. I started going through the troubleshooting guide on http://www.autosportracetech.com/RX-7/rx7stuff.htm
and I disconnected the vacuum line on the CCA. I found no vacuum so I left it disconnected. I went for a drive and I get 10 psi boost ! I reconnect it and I'm back to 3 psi. Anyone know what's going on here ?
and I disconnected the vacuum line on the CCA. I found no vacuum so I left it disconnected. I went for a drive and I get 10 psi boost ! I reconnect it and I'm back to 3 psi. Anyone know what's going on here ?
#2
The Power of 1.3
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Sounds like the CCA is malfunctioning and staying open. If the CCA stays open some of the pressure made by the primary would back-track to the secondary, and if there was enough pressure it'd go right out the intake, wouldn't it? (Just a guess based on knowledge of seq. system. Sorry if thats horribly wrong.)
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Right, I'm looking at the manual now. The primary can vent boost to the secondary if CCA is open. Maybe I'm getting boost to the vacuum side of the CCA ? Then disconnecting the line makes it atmospheric so the boost closes the CCA and gives me full primary boost ?
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Got it. The check valves to the vacuum chamber were wrong. No vacuum = open charge control = primary vents to secondary = 3 psi boost max. Got 10+ now, gotta do the hd boost controller.
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