DTR members have the greatest interest in HP upgrades for the ProR800 and Etec800! Where is the long awaited data?
We’re still waiting for pipes to test on the ProR800–SLP is doing their flatland field testing this week before shipping, and BMP and DynoPort should be shipping their production stuff soon. As soon as we can get pipes from them, Casey Mulkis is ready to test a stocker, and one more time with the shim kit.
Billy Howard was scheduled to test stuff he’s acquired for the Etec800 but his field testing on his long plowed snow strip has shown strange issues–one 1/4 mile blast with good acceleration, followed by another short blast with poor acceleration, underrevving. So we’ve put that session on hold until we figure out what is causing the grief. My pal Rusty from Rapid City SD is experiencing the same problem with his bone stock Etec800 at 6000 ft altitude. We’re thinking now that it is exhaust temp creating this strange loss in power after some reasonable time at WOT. The probe in the muffler may be getting up to some temperature, and then the ECU drops the power level and causes underrevving. What causes the drop the power? Retarding the timing would only increase the ex temp, making the pipe even hotter. Adding fuel would even help Billy’s sled, which is boarderline lean with the exhausts he’s testing. So could they be lowering the exhaust valves slightly to choke off airflow? At any rate, Billy has eliminated the power dropoff by advancing his ignition timing with his buds computer. Rusty is planning to do the same with his stocker, and test it this weekend. Now, advancing the timing reduces exhaust temp (the fire stays inside the combustion chamber instead of blowing out the exhaust ports, hopefully making more cylinder pressure and torque), and maybe Billy advanced his enough to heep the muffler temp below the threshold temp. We’ll know more about this phenomenon next week, and hope we can reschedule the Etec800 test session.