Re: What performance gains? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: What performance gains?
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Posted by Dean (more from Dean) on Wed, 4 Oct 2000 14:49:45 Share Post by Email
In Reply to: What performance gains?, Talladega900, Wed, 4 Oct 2000 14:25:46
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The turbo spins up faster. It is like your throttle was never able to open fully before. The rework eliminates the step ID reduction that creates a great amount of turbulance. When this is fixed, the air flow is much smoother. You get more power, and the engine acutally runs smoother. This is because the cylinders were getting inconsistant air charges and varying AF mixures.

Others have also done this rework and have come to the same conclusions. More responsive, more power, smoother at WOT. The result is definately obvious, but not in the same league as increased boost pressure.

Gas consumption should not be affected. But there was one report of improved consumption.

The manifold pressure under boost at WOT will not change. The pressure control feedback point is at the manifold. The rework allows the turbo to not have to work so hard to overcome the restriction. The turbo then heats the air less, and works at a more efficient part of the compressor map, which also means less heat. So the cylinder air charge will be denser. And because the compressor needs less power from the turbine, the wastegate is running more open, which means less turbine back pressure. That translates to more power as less power is expended pumping the exhaust gasses out of the cylinders and through the turbine. You can also apply the same explanation to the effect of removing other restrictions such as a restrictive air cleaner and air box, removal of the turbo discharge silencer or upgraded intercooler.

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