Picked up a new 2014 e4 with low miles last week . My current e4 is a 2014 HP gem that I drive / race daily . It’s a great Gem but I’m bored with it and decided to do another custom . So New Gem sat for years , low miles , bad battery pack and brushes on the motor were stuck ( common problem on the 7hp Advance black motors). So Sunday afternoon , removed the lead pack , swapped motor for a R4F blue motor , reprogrammed the controller , swapped tires and wheels , Installed 25 of INWO’S green batteries . 4 hours latter , it was back on the road . This is the 3rd Inwo lithium conversion I have done so kinda knew what to expect . Gem was fast and cranked out over 20 miles . This was a good start .
Yesterday had a few hours available and decided to step it up . Gem motors love higher voltage and when given higher voltage they use less amps and therefore go farther . So added 2 more cells (27 total ) reprogrammed the DeltaqQ to 94v charge . Took awhile to top balance 27 cells but it is worth the effort . Off I went . This thing accelerates very fast , Tops speed was over 40 before speed limiter kicked in . Best part was it did over 31 miles and still had every cell over 3v . It had a few more miles left in it , but I didn’t . One of the best things is that it was still fast and would easily hit mid 30mph even after 30 miles , It never became a dog . The 2 additional cells made a nice difference but require a lot more effort on the install .
The Gem can handle one more cell but it’s already faster then I want and has a farther range then i need . So I don’t see me pushing it farther . The controller still is running the stock minimum field amperage to preserve millage and motor so i’m expecting good long term results .
The only thing I’m not happy with is the whine . I run heavy regen and this combo whines hard . It has nothing to do with the batteries and these gear boxes are known to whine a lot . Going to try a Ge motor and an Advance motor to compare the differences with the RF$ motor . Will keep everyone posted with the head on comparison . Anyone know where i can buy a 7hp Ge motor ?