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I posted a while back regarding performance on my 1992 turbo convertible. I wanted to post the results of a tuning / dyno session yesterday. I have 30 # injectors, a rrfpr (Group 9, fuel management unit), and a red series Swedish Dynamics APC unit. First pull on the dyno and the tuner said that it was the sickest car he had ever seen. In my previous post, I stated that I was having a rough spot when the car went into boost. This rough spot turned out to be a dangerously lean air to fuel condition, (13:1). The car was making 58 hp at the wheel with not much more than that for torque. There was a check valve in the vacuum line to the fuel regulator restricting air movement that we removed. That improved things. Secondly, we checked the timing. It was advanced 4 degrees; we set that to the factory setting of 16 degrees. From there we played with the rrfpr. It was running rich, (lower than 9:1), for a while as we turned the needle valve in. Finally, we got it close to 11:1 with the needle valve turned out .75 of a turn. At that time, we made 125 hp at the wheels with 154 # of torque. With front wheel drive, there is an estimated 70 - 80 hp loss from the engine to the wheels. The APC unit would cut the boost at that point and not permit the engine to go any higher. The turbo boosts to 16 on the gauge at this point. We then disconnected the knock sensor and the power curve was much more even through the pull, however, there was some detonation on the upper end.
Overall, it was the best money ever spent getting all of the components to work together and maximize horsepower from the car. It was much faster and spool up was snappier than it had ever been.
Jon Jennings
'91 SPG
'92 Turbo Cvt. (Now very fast)
'99 95
posted by 205.188.116...
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