REM and Surface Treatments

Andy Friar · 10-17-2019, 02:48 PM

REM finishing your gears does help reduce friction between the gear mesh. Getting your gears down 4 Ra surface finish still enables the teeth to still have enough roughness to hold an oil film. Based on what I could learn from the Microblue website, the surface coat is to encourage cover and retention properties of the oil but won't change the surface hardness. My first guess is that you would then be able to run a lighter weight oil in the diff, and thus be able to reduce the windage and churning losses associated with gears going through and slinging oil. Like any of these kinds of changes, the percentage gain is minimal, but I can not see it making the car slower. As another data point, Nascar ring and pinions are DLC coated these days and that combined with improved tooth geometry I am told yields 1-2 mph in an A to B comparison test on a Super Speedway depending on the ratio used. There are 42 different ratios for nascars...

10-17-2019, 02:48 PM	#6
Andy Friar Member Join Date: Aug 2013 Location: Howell, MI Posts: 250 Likes: 699 Liked 226 Times in 76 Posts	Re: REM and Surface Treatments REM finishing your gears does help reduce friction between the gear mesh. Getting your gears down 4 Ra surface finish still enables the teeth to still have enough roughness to hold an oil film. Based on what I could learn from the Microblue website, the surface coat is to encourage cover and retention properties of the oil but won't change the surface hardness. My first guess is that you would then be able to run a lighter weight oil in the diff, and thus be able to reduce the windage and churning losses associated with gears going through and slinging oil. Like any of these kinds of changes, the percentage gain is minimal, but I can not see it making the car slower. As another data point, Nascar ring and pinions are DLC coated these days and that combined with improved tooth geometry I am told yields 1-2 mph in an A to B comparison test on a Super Speedway depending on the ratio used. There are 42 different ratios for nascars... __________________ Andy Friar