harnishclan wrote:Had great access to a dyno last week and learned a lot. My car did many pulls, sadly peaking at 123.1 RWHP. I guess the 250K miles with no internal repairs is finally starting to take their toll. Guess a rebuild is in the not too distant future.
The learning occured as a result of the exhaust system. It is MSDS header to 2.5" tubing through a magnaflow resonator and ending in 19" supertrapp resonator. Car has an FR Wilk chip and a K&N air filter, all the rest is stock. Peaks all were 6000-6100 with the curve droping like a stone afterwards. With the cap off and no restriction HP was 123.1 torque 127. With 6 diffusers and endcap on, HP 116.4 and toque 123. With 12 diffusers and endcap HP 121.6 and torque 125. Mixture remained fairly consistent and well within acceptable ranges in each of three different configurations. And the shape of the curves is pretty consistent as well.
harnishclan wrote:"Typical" 944 N/A engine should have 129-138 at the rear wheels depending on environmental variables and early vs. late engine from all the information I have been able to gather in total stock form. I was hoping to be a little closer to that range, but the real surprise was the difference in the exhaust. All the marketing for supertrapp says increased torque with the cap on due to backpressure. But there was no appreciable difference in torque across any configuration, only the HP changed. And while 8 HP doesn't sound like much to most, that is about an 8% change for my particular engine on that particular day which is a lot of change.
harnishclan wrote:"Typical" 944 N/A engine should have 129-138 at the rear wheels depending on environmental variables and early vs. late engine from all the information I have been able to gather in total stock form. I was hoping to be a little closer to that range, but the real surprise was the difference in the exhaust. All the marketing for supertrapp says increased torque with the cap on due to backpressure. But there was no appreciable difference in torque across any configuration, only the HP changed. And while 8 HP doesn't sound like much to most, that is about an 8% change for my particular engine on that particular day which is a lot of change.
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