I just got into the hobby! not racing yet but getting close. we built a track we are practicing on. I have a buggy and a truggy both with the older version of the S7! they both scream. both engine were bought used and i have gone thru 3 gal. of blue thunder 20%. without a problem. Iam running jp1 and jp2, and werks clutches. any Ideas would be appreciated or other engines I should try! reliable as the s7