Variable vane turbo a quite interesting to drive. They make so much boost early and do not suffer from high back pressure. Back in the early 80's we worked with Aerocharge for applications on SAAB's. The Aerocharge has the vanes on the exhaust side and the bearings are ball bearing mounted in the inlet side of the turbo. When we started we were using prototype units. While there were problem with them at the time most of the issues have been resolved. We had developed kits for the 8V and 16V turbos having patterns made for casting exhaust elbows to adapt the Aerocharge to the stock exhaust system. The first benifit was being able to make full boost before 1800rpm in an 8v automatic. We performed a lot of tests, the most interesting was comparing exhaust manifold back pressure to boost. On an 8V with stock exhaust back pressure would never exceed boost. On a stock car of the time a 5000rpm back pressure would be three times boost so at 7psi boost back pressure was 21psi, not good for power.
Most of the problems with the Aerocharge have now been solved the only current reason I do not have one on a car is they do not make the larger size at this time. The smaller unit will not flow enough air for my use.
A year or so ago we got one of the old ones out and put it on a 1986 900 16V NA automatic and made a 13.9sec run in the 1/4. This car would make all the boost we wanted at the line. We limited make boost to 8psi. At 8psi the torque converted that is a 1800rpm stall unit would stall at 3000rpm. A large increase in launch power.
As for the unit pictured further down the post the vane design is very simulair but not as many.
If the turbo you have is made to with stand 1900F and the compressor map is of the correct size you will be happy.
Brad

posted by 208.229.4...

• Variable Vane Turbo, Mark, Thu, 29 Aug 2002 06:57:10
  • Re: Variable Vane Turbo, Brad, Thu, 29 Aug 2002 21:37:05 <-- Viewing This Message
  • Talk to Brad he had this on his racer. fast but short, Jack Crawford, Thu, 29 Aug 2002 12:44:43
  • Re: Variable Vane Turbo, Andrew , Thu, 29 Aug 2002 10:28:42
    • The spirit RT was the ultimate sleeper, Chad, Thu, 29 Aug 2002 14:17:23
    • quick is an understatement, nickR, Thu, 29 Aug 2002 12:35:56
      • Re: quick is an understatement, Stephen, Thu, 29 Aug 2002 13:28:42
        • Re: quick is an understatement, Mark, Thu, 29 Aug 2002 13:57:18
          • Uhhh.. what trans will hold yer 'hoped for' power?, Andrew , Fri, 30 Aug 2002 00:24:38
            • Um, his is a 9k, presumably ('91 2.3) nm, Eric van Spelde, Fri, 30 Aug 2002 01:44:06
          • Re: quick is an understatement, Eric van Spelde, Thu, 29 Aug 2002 15:37:57
  • Garrett was at SOC 2001, RS , Thu, 29 Aug 2002 08:45:12

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