synthtk Posted October 8, 2009 Share Posted October 8, 2009 I searched but didn't really find any info... for those of you that have Dyno'd your RB how are you picking up RPM? I usually dyno on a DynoJet and we always have issues with the RPM signal being not synced correctly or going crazy above ~6000 RPM. The Dyno in question has an inductive pickup which we tried looping around the little pigtail off the ignitor and around the coil 1 wires but it never got a good reliable signal. Last time I went we ended up using an optical pickup w/ a mark on the crank pully which worked great until around 400 ft/lbs of torque and the car seemed to move too much for the optical to work... Thanks -Chris Quote Link to comment Share on other sites More sharing options...
eh? Posted October 9, 2009 Share Posted October 9, 2009 Use the white wire going to coil #1. It has always worked well for me with my cheap actron timing light and on the dyno where they verified timing with a $$$ snapon light. I've been on two dyno jets and they were able to pick up rpm with it. Quote Link to comment Share on other sites More sharing options...
cheftrd Posted October 10, 2009 Share Posted October 10, 2009 If that fails, you can pull the #1 coil and make a jumper coil wire between the plug and coil to put the pick up on. Ground the coil. Quote Link to comment Share on other sites More sharing options...
stony Posted October 10, 2009 Share Posted October 10, 2009 Havent tried that... seems this is a common issue for rbs on the dyno. i had the same issues with both my stock motor and my current motor. lost RPM right around 6K Quote Link to comment Share on other sites More sharing options...
Drax240z Posted October 10, 2009 Share Posted October 10, 2009 Is there an option of an RPM pickup that isn't inductive? On the DD machine I used to have we would just use the tach signal wire. Quote Link to comment Share on other sites More sharing options...
Tony D Posted October 10, 2009 Share Posted October 10, 2009 On the Mustang there is a gearing option to take drum speed and interpolate engine rpm. Input ratio of total gear you will make your pulls in (ours fourth is 1:1, and the final drive is 3.70 so that makes it easy...), and make the runs. Of course if you slip your clutch, or the tires have slippage on the roller...it skews. Quote Link to comment Share on other sites More sharing options...
synthtk Posted October 13, 2009 Author Share Posted October 13, 2009 Thanks for the info guys, hopefully the next trip to the dyno will be more productive Quote Link to comment Share on other sites More sharing options...
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