Re: $1.50 Modified Retard Capsule - Saab 900 Bulletin Board - Saabnet.com
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Re: $1.50 Modified Retard Capsule
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Posted by Saabina [Email] (more from Saabina) on Fri, 17 Nov 2017 14:10:02 Share Post by Email
In Reply to: Re: Modified Retard Capsule Re-Visited - Followup, Saabina, Wed, 15 Nov 2017 18:39:46
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Subsequent to the prior posts, I bought a 2-pack of small Raindrip R612C 1/4" Barbed Valves for $2.99 at the local hardware store. These are commonly used for lawn and garden irrigation systems. I installed one in the supply line from the intake manifold just upstream of the dizzy retard capsule. A series of highway and stop/go test drives resulted in a 3/4 closed setting being optimal on my '93 c900 turbo. Suspecting this was too much restriction, I tested the valve at 10-12psi using an air compressor and glass of water. Surprisingly, there was still significant flow but dramatically less than would be allowed without the valve. Given the small volume of the capsule, the reduced flow will ultimately fully actuate it but over a longer period of time. YMMV but it is working well for me and my c900 is a joy to drive accelerating smoothly in 3rd, 4th & 5th from non-boost to boost and no noticable issues with idle or otherwise. I don't have a modified spring capsule or a -10 dizzy to compare but for $1.50, I'm stoked on this simple improvement. The valve is small enough and actually looks like it belongs there. I'm adding them to the '90 SPG, '92 Turbo Vert and '91 MCY SE as soon as possible.

Thanks to Craig (thetallguy) for piquing my curiosity on this subject!

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