Re: Modified Retard Capsule Re-Visited - Saab 900 Bulletin Board - Saabnet.com
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It's a good idea! It may or may not work for the total boost curve but it should improve the flat spot. Restricting the boost pressure/signal to the Boost Control Valve was/is how some people build a manual boost controller. It could certainly work for this application; it's just a hardware modification to a mechanical process. If you have a flat spot in the initial boost curve try the restriction or advance the distributor...advancing the timing by moving the distributor does change the retard point at max boost (less retard because of more initial advance) which may or may not affect your max boost. Need more retard at max boost? cut down the retard "stop" or the "arm" some more. Easier done if you have an adjustable "stop". Timing specs. for cars with distributor cap/rotor hardware are "suggestions". What is deemed correct from the manufacture is a starting point only-every car will vary slightly from the factory spec when tuned for "best" torque, or "maximum" horsepower, or even "best" mileage. That is because the 900's non computer controlled mechanical hardware cannot meet all of these goals all the time. It can be tuned to meet one exactly and get close on the others...you pick a goal and tune for that. Only the newer engine management systems have the means to meet all goals under all conditions all the time...so play around with the timing and see how it goes. I apologize if you already know this.
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