In Reply to: talking non-lambda..., Kevin K [Profile/Gallery] , Sat, 4 Aug 2001 09:38:38

Look at the warm up regulators (as the control pressure regs are known by over here) for non-lambda (UK spec <89, EU spec <87) 900T8's (Sorry, don't have a pic that's clear enough. Will look and post to the 'new' TTE site as sson as I'm building it, however). There's a nipple to which a vacuum line connects. Control pressure is dropped from 3.8 to 2.4 bar when boost pressure exceeds 0.3 bar. I've sent two of those to Matthew Becker in the USA, I'm sure he'll report back when he has one on his car.

However, this replaces the lambda WOT enrichment and will only be sufficient for boost pressures up to slightly above stock (ca. 0.85-0.9 bar, corresponding to 185-190 hp max with proper tuning). Remember a stock 86-on non-cat 900T8 has 155 hp. Adding a 5th injector will support up to about 220 hp in conjunction with the 6-port (with two ports blanked off) fuel distributor used on non-lambda T8's.

Fuel distribution of the 5th injector's output is an issue though, but placing it as far from the combustion chambers as possible (i.e. well before the throttle body) and having it only open at high (i.e. over stock max) boost pressures (=high air velocity) goes a long way towards eradicating those problems. At any rate, they are far less significant than replacing the main injectors with counterparts that have a higher flow rate, and than having to recalibrate the whole system to avoid running over-rich on idle, light throttle openigs etc.

As I've often said, the rationale behind fitting a 5th injector to a turbo engine is this: car manufacturers have spent lots of development on fuel systems to provide optimum running chacteristics, performance, consumption and emissions for a wide range of running conditions. Are you willing to throw that all away, just because you want additional fuel for supporting higher boost pressures?

• 8V Turbo + 5th injector/water injection max boost?, Angus M Smith, Fri, 3 Aug 2001 13:58:25
  • Re: 8V Turbo + 5th injector/water injection max boost?, Brad, Fri, 3 Aug 2001 16:45:38
    • Re: 8V Turbo + 5th injector/water injection max boost?, Angus M Smith, Sat, 4 Aug 2001 07:22:37
  • what the heck is a 5th injector?? do you ad another cylinder? :), bob, Fri, 3 Aug 2001 14:56:56
    • It's the cold-start valve. n/m, jj, Fri, 3 Aug 2001 16:14:14
  • Re: 8V Turbo + 5th injector/water injection max boost?, Kevin K , Fri, 3 Aug 2001 14:10:41
    • Won't work, because we're talking non-lambda..., Eric van Spelde, Sat, 4 Aug 2001 09:16:49
      • talking non-lambda..., Kevin K , Sat, 4 Aug 2001 09:38:38
        • Not a myth..., Eric van Spelde, Sat, 4 Aug 2001 10:56:09 <-- Viewing This Message
          • Re: Not a myth..., Kevin K , Sat, 4 Aug 2001 14:23:34
            • Re: Not a myth..., Eric van Spelde, Sun, 5 Aug 2001 14:41:33
              • sure, will do. n/m, Kevin K , Mon, 6 Aug 2001 11:52:44

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