Black Magic Clutches – Interactive Clutch Tuning Podcast with Cale Aronson – April 23, 2020

Excellent clutch tuning webinar by Cale Aronson:

Part 1:

Part 2:

Roger Young & Jamie Roth – 2016 BC Super Shifters Race at PR – Mike Ward photo

We confirmed by the webinar that we’re not very far off on our clutch settings. When we have the unit rebuilt we’ll lower the base pressure spring rate and rely more on counterweight to give us a larger tuning window from what we learned from Cale last evening. I thank Cale for sharing his extensive knowledge with all of us!!

Below is a capture of our RacePak data from last run of 2019. Blue line is Engine/Driveshaft ratio. I’ve placed the vertical cursor where high gear goes 1:1 and clutch lockup is at 6488 engine rpm – we’re shooting for 6600 so we’re close. The blue line also vividly shows where you spike the tires on the gear changes, 1-2 naturally being the worst due to less ground speed and lower ratios. This was with the 3.19 1^st gear. – Roger

[Click on photo for full size]

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About Roger

Driver of our '57 Chev from 1972-2019, Vietnam veteran (A Troop, 3/17th Air Cavalry Scout helicopter Line Chief and later Cobra Periodic Inspection team leader), retired ASE rated automotive mechanic. Roger became involved in drag racing during his high school days and after his stint in the Army ran E & F/MP [Modified Production] here in Division 6 before switching to bracket racing when the '57 became obsolete for class racing. He often raced at Puyallup, Kent-Pacific Raceways, Bremerton, Portland & the original Mission, B.C. track.

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