The pinion bearing in C900 trannies is a weakness, but once you get beyond that, you have to deal with several other weak internal components. The forks on pre 91 boxes are weak, as are the gears themselves. I stripped half the teeth off of third gear a year ago! This was on an 88 box, of which I did not know the total history. Now I have a totally rebuilt 91 box with 89 - 90 900S (not turbo) gearing and components. It seems to be handling the power just fine.... for now!

Lack of proper fueling with the higher boost levels = predetonation inside the engine = blown headgasket. Of course, over fueling washes down the cylinder walls with fuel, decreasing oil pressure, which is also quite bad! ;o)

Check out the link below. My brother and I have been running this small mod on our C900s for about 100K miles now with pleasant results. Saab instituted this modification on their own in Aero and NG900 HO Turbos. Combine this mod, a 3.0 bar FPR, and turn the pots on the APC, and have a ball, all for under $20.

Mike
88 SPG
95 Aero



posted by 12.40.175...

BOC Solenoid Mod for Cheap and Easy Boost

• Minimum mods 88SPG, bgant, Wed, 8 Jan 2003 12:56:24
  • ah, to be at the beginning again!, WASSAAB, Wed, 8 Jan 2003 15:21:35
    • When you get past 15psi what can be damaged?, KB88900T, Wed, 8 Jan 2003 16:43:07
      • Re: When you get past 15psi what can be damaged?, tyler, Thu, 9 Jan 2003 20:00:34
        • Re: When you get past 15psi what can be damaged?, Taylor, Fri, 10 Jan 2003 01:53:28
          • Re: When you get past 15psi what can be damaged?, Tyler, Sun, 12 Jan 2003 21:11:40
      • Re: Red box looks good, but not much different..., JohnK, Wed, 8 Jan 2003 17:18:26
        • Thanks for info. I have all the '88 ECU black box and, KB88900T, Wed, 8 Jan 2003 17:27:33
          • Re: Thanks for info. I have all the '88 ECU black box and, JohnK, Wed, 8 Jan 2003 17:48:14
            • Thanks JohnK. Best, KB. n/m, KB88900T, Wed, 8 Jan 2003 18:21:37
      • Engine can blow in several different ways..., Chaz, Wed, 8 Jan 2003 17:12:01
        • I have rebuilt tranny with pinion upgrade. When I go, KB88900T, Wed, 8 Jan 2003 17:21:06
          • The pinion is bad, but the rest ain't great either!, WASSAAB, Thu, 9 Jan 2003 10:17:36 <-- Viewing This Message
            • How come someone doesn't come out with a bulletproof, KB88900T, Thu, 9 Jan 2003 14:27:52
              • Re: How come someone doesn't come out with a bulletproof, GM, Fri, 10 Jan 2003 18:00:58
              • There were FWD dragsters for years...., Chaz, Thu, 9 Jan 2003 23:43:58
                • Re: There were FWD dragsters for years...., GM, Fri, 10 Jan 2003 17:49:53
                  • Is it true that Saab LSD's on 9000 were a problem?, Chaz, Fri, 10 Jan 2003 21:02:58
                    • Re: Is it true that Saab LSD's on 9000 were a problem?, GM, Sat, 11 Jan 2003 00:15:35
              • Because Saabs are FWD? ;-), Eric van Spelde, Thu, 9 Jan 2003 14:41:14

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