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cyclopathic · 09-17-2016, 01:45 AM

I am looking to replace the OEM Shunt type R/R with series unit, and if my math correct depending on speed this should give me 3-13% MPG improvement?

OEM stator is rated at 35A (420w) and this is constant load due to shunt type R/R. The actual electric load is 190w less, which with series unit should reduce engine drag by 0.26hp.

Per calculator depending on speed (35-65mph) road+aero load is 2-10.3hp, so the 1/4hp drag reduction should give ~3-13% improvements.

Am I missing something?

I suppose at lower speed the stator output will be less than max, so 13% is over-estimate.

09-17-2016, 01:45 AM	#1 (permalink)
cyclopathic EcoModding Lurker Join Date: Apr 2015 Location: suburbia Posts: 76 Thanks: 15 Thanked 14 Times in 12 Posts	Replacing R/R for better MPG? I am looking to replace the OEM Shunt type R/R with series unit, and if my math correct depending on speed this should give me 3-13% MPG improvement? OEM stator is rated at 35A (420w) and this is constant load due to shunt type R/R. The actual electric load is 190w less, which with series unit should reduce engine drag by 0.26hp. Per calculator depending on speed (35-65mph) road+aero load is 2-10.3hp, so the 1/4hp drag reduction should give ~3-13% improvements. Am I missing something? I suppose at lower speed the stator output will be less than max, so 13% is over-estimate. Last edited by cyclopathic; 09-17-2016 at 02:30 AM..