Thread: New Member - 1988 IROC

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The cam is a comp cams xtreme energy 284H.

I was wondering about the engine being within it's powerband in OD.

I was doing the math and the OD would take me from 3200 down to 2400 RPM at 65 MPH, thats not counting a little torque converter slip, say another 300 RPM? I had planned that i would only drop it into high gear when at highway speeds, as it is now I am afraid to take it on the highway as it's just hard on the motor. Speed limits here are 75 on the interstate, that would be 3700 down to 2750 RPM with OD. I definitely don't see me running the OD except when rolling at a speed that would give me at least 2500 RPM.

What do you think? I want to keep the 4.10:1 differential performance at the strip and not wear my motor out getting there lol.

Originally Posted by Renfro

The cam is a comp cams xtreme energy 284H.

I was wondering about the engine being within it's powerband in OD.

I was doing the math and the OD would take me from 3200 down to 2400 RPM at 65 MPH, thats not counting a little torque converter slip, say another 300 RPM? I had planned that i would only drop it into high gear when at highway speeds, as it is now I am afraid to take it on the highway as it's just hard on the motor. Speed limits here are 75 on the interstate, that would be 3700 down to 2750 RPM with OD. I definitely don't see me running the OD except when rolling at a speed that would give me at least 2500 RPM.

What do you think? I want to keep the 4.10:1 differential performance at the strip and not wear my motor out getting there lol.

http://www.compcams.com/Technical/Dy...84H-10_001.asp
Here are some dyno results on that cam. You can see that they began reading it at 2500......
If I just wanted to keep the r's down for longevity and was not too concerned about mileage, I'd use the motor as is.

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