Thread: Stumble Valves
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9/30/17, 7:56 AM   #2
jdperform
jdperform is offline
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Join Date: Apr 2008
Posts: 61
 

Yes most time you will set barrel a touch richer. The stumble will generally be its most effective between 2500 and 4500 rpm. When used I do like to include a shut off valve for the stumble. It can help keep the motor a little cooler during yellows etc. to shutoff the valve. Also the driver can easily test restart response both using the valve and having it shut off.