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In my car ('91 9000T), I thought my overboost switch was non-existent because I had seen my VDO gauge touch 20psi on more than a few occasions.

Then one day, my friend was driving my car on the highway and I guess he decided to floor it at 55mph, in fifth gear, up a hill (that'll get the 'ol turbo goin'!!!). I wasn't paying attention until suddenly it felt like someone had dropped an anchor and I looked over to see the gauge reading 21-22psi (I guess he kept his foot on the gas)...I can only imagine what it might have been reading before the cutoff occurred...

- and so I'm having flashes of pistons and valves joining together in a glorious molten stew, and I'm like "ummm...yeah...if you could just go ahead and never do that again..."

The point is, I have a pressure switch that works, but only kicks in at some unearthly, piston-melting boost level. So I trust my boost gauge far more than this mysterious item.

I know that my boost gauge is resonably accurate because it seems to correspond to what I would expect for the stock gauge, meaning that the beginning of the solid red is equal to about 13-15psi.

I use a maual boost controller that I designed, and I always have been very satisfied with how it functions, given the fine level of control that it offers. If you're willing to take the risk of neutering the APC, I believe that an MBC would be the cheapest way for you to achieve the boost levels your looking for. From my perspective, the increased response and faster spool up are well worth the risk.

Good Luck!

-Kyle
'91 9000T



posted by 24.60.14...

• Who’s running the highest boost on an 88 9KT?, ben, Fri, 13 Sep 2002 10:08:36
  • from yer answers.. yer Gauge is way inaccurate, Andrew , Fri, 13 Sep 2002 23:27:44
    • I see lots of umpty-hundred dollar ones ..., Quasi, Sat, 14 Sep 2002 01:24:25
    • and how would this help me?, ben, Fri, 13 Sep 2002 23:34:17
      • Re: why is my guage inaccurate?, Phil, Sat, 14 Sep 2002 00:40:12
        • My experience coincides with Quasi's., Aaron Gilbert, Sat, 14 Sep 2002 01:48:34
          • Re: My experience coincides with Quasi's., Phil, Sat, 14 Sep 2002 09:53:55
        • I'd bet on the gauge accuracy ..., Quasi, Sat, 14 Sep 2002 01:27:48
          • I agree with Quasi..., Kyle, Sat, 14 Sep 2002 02:20:41 <-- Viewing This Message
            • Actually, the 91 doesn't have a switch, Quasi, Sat, 14 Sep 2002 09:46:45
  • Surprising you get as high as you do with stability.., Aaron Gilbert, Fri, 13 Sep 2002 12:44:56
  • Re: Who’s running the highest boost on an 88 9KT?, Andrew , Fri, 13 Sep 2002 12:08:52
    • please tell me how?, ben, Fri, 13 Sep 2002 12:32:16
      • Re: Autometer is wrong then >, Phil, Fri, 13 Sep 2002 13:17:08

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• Prev by Date: My experience coincides with Quasi's., Aaron Gilbert, Sat, 14 Sep 2002 01:48:34
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