Re: linky that was quoted from a no name thread will expire - Saab 900 Bulletin Board - Saabnet.com
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Re: linky that was quoted from a no name thread will expire
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Posted by Chaz [Email] (more from Chaz) on Tue, 16 Oct 2007 09:36:34 Share Post by Email
In Reply to: linky that was quoted from a no name thread will expire, Chaz, Tue, 16 Oct 2007 09:28:45
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fifth injector -- 1989 900T

This is the substance of the quoted page. I will copy the pics to my Saabnet pics BB.

I would love pics of the wiring and what exactly was done, as 'refer to Bentleys Manual' is annoying. I am not sure why wires to the ECU need grounding.
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The U.S. 1989 900 Turbo has a cold start injector plug included in the wiring harness, so adding a fifth injector is simplified. Other years may be similarly equipped but, if not, you can easily tap into the injector harness -- there is sufficient power for a fifth injector.

For power, you need to access the ECU wiring plug, ground the wire (see your Bentley manual), and add a pressure switch to the circuit so the injector only runs at high boost. The switch, which is adjustable, can be found on LH2.2 Saab 900 Turbos, and is located under the dash (refer to Bentley for specific location).

To supply fuel to the injector, go to the boneyard and grab a double banjo bolt from a CIS Audi or Volkswagen; you'll also want to grab a braided stainless steel fuel line from the same car; be sure it's long enough. The banjo bolt will fit right on the Saab fuel rail and allows you to easily supply the injector. The follow photo diagrams the fuel line set-up at the fuel rail:



Mount the fifth injector at the intercooler outlet. You can do this by poking a very small hole in the rubber coupling, then forcing the fifth injector nose through the hole. It's a tight fight (as it should be), so take your time. Once installed, secure the injector with a couple hose clamps. Do not mount the injector in the throttle - the 4th cylinder will receive insufficient fuel and run lean.

The following photo shows the installed injector:



Using a 100ml graduated cylinder, I carefully measured the flow of a number of Bosch cold start injectors (average of three times sprays). The largest one came from a 5-cylinder Audi. Presumably, larger CIS-equipped engines, such as V6 Volvos or V8 Mercedes will flow more.

Some data: Saab CIS cold start injector at ~9.2 lb/hr (89 cc/min), Audi 5000 at 11.6 lb/hr (113 cc/min). Tested in car, while running, with 3 bar FPR, healthy fuel pump, and nearly 43 psi on pressure gauge.

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Just to explain, it is easy to add an injector to the set, as our cars are batch fire, meaning all fuel injectors fire at the same time. All we need to do then is add a oressure transducer to limit when the injector is turned on.


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