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Discussion Starter · #1 ·
I have a 11 rt 5.7 swapped a 392 cam no.mds vehicle has a 6.1 intake hemifever has tuned it. But driving steady speeds 20-40 i feel a surge of about 50 rpm you can feel it and hear it in the exhaust. Any ideas
 

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Have you done any revisions to the tune since you got it running after the initial start up tune? If not do a data log of the problem area, some normal in traffic driving, and a full throttle run in 2nd or 3rd gear from about 1500 rpm's to red line between 6000 and 6400 rpm's. E-mail that back to Hemifever and he will corrected it or let you know if it is a mechanical issue that needs attention.
 
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