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Dyno Results of an Engle TCS-55 camshaft installation |
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Let me set the stage: Chris Thomason, one of "Those Baltimore Boys" has been creating a stir by running 13.9s at 102 in his surprisingly stock 87 Merkur (Mare-Koor) XR4ti. Modifications to date, include;
Chris was looking for even more power, and had heard about the Engle cam, that I sell and swear by. I think the Engle's cost was a determining factor in Chris' decision to get one, at this point in his car's development. At $149 delivered with the followers, it's a pretty good deal. For 2.3 owners (auto, and the earlier cars) that don't have the larger cam from the factory, it's an even better move. But I digress.. So, I've been hearing how fast Chris is running, and when he says he wants to buy a cam from me, I figure this is a good oppurtunity to show what they can do, and I volunteer to put it in for him. Then, coincidentally, a DynoJet dyno got installed about a block from my house. So, the stage is set! Here's the dyno sheets and my conclusions. Comments are welcomed! |
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This is the baseline run. Chris had just driven down here from B'more, and didn't even let the car cool off. These are rear wheel HP numbers. 216 with a correction factor of 20% HP loss works out to 270 at the flywheel. Pretty good! Note: I use a 15% correction factor now, so this would work out to 248.4 hp at the motor. |
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We had gone back to my house and installed the cam. Since we didn't have a degree wheel, we couldn't optimize it. We brought the car back to the dyno and made this run. ARGGG! What have we done! uhhh... We had reconnected the knock sensor. Who did that? :)
So, we pulled the connector off of the knock sensor and made the next pull. |
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Well, we've gained back the power we had, at least. And a little more. It's 4.9 HP more to be exact. Looking at the curve, you can see that it's bigger all over, from 3200 RPM on up. This is a different result from your normal cam installation. Usually the power curve is moved in RPM, losing some at the bottom, and gaining some at the top. You can ignore the differences between 2500 and 3200 RPM, because Chris was driving this time and it's hard to match driving styles between two different drivers. The conclusion I came to, and that the Dyno owners agreed on, was that the car is now flow limited somewhere. I would think it's all of it. Exhaust manifold, intake manifold and head. |