Top speed question

Grizzley

Member
I have a question for all you math gurus out there. I have 25 inch tires(circumference is 78.5) on my EZGO and I have the stock rear end which is 3:875 ratio. What approx. MPH would I reach at 3000 rpm? And if I bought the HS gears which is a 3:105 ratio how much would it change my speed? I know the BU catalog says you get an approx. 6 MPH gain. But would it be different on my cart since I have bigger tires and engine? I could probably figure this one out myself if I had a year or so to think about it, so I was hoping that someone on here would know a few formulas for this crap.
Thanks Gregg
 

spriddle

Post Decoder
I don't have any formulas or anything like that but I will comment on the top speed of your cart. With stock engine and stock rearend (governor completely adjusted) you will not get much over 25mph due to the rev. limiter on the ezgo. With the bigger tires you might reach close to 30mph, but doubtful. And yes, the high speed gears will only give you about 5mph more at the most (of course that depends on rpm's which are limited on the stock engines by the rev. limiter). My personal opinion on the high speed gears: not worth the price that they are sold for. If they were around half the price, I would say do it.
 

Grizzley

Member
Yeah, its about 56 bucks per MPH. A little too much for my tastes.
Thanks Spriddle
Wonder why they are so much?
Gregg
 

spriddle

Post Decoder
Popularity is the only thing I can think of. Everyone is looking for speed out of these carts. I bought some, but they were $100 dollars cheaper last year. They are around $300 now which is ridiculous in my opinion and it is not that much of a difference in speed. I wouldn't suggest the high speed gears at all to anyone with large tires and stock engine due to loosing torgue. One thing I will share here: if you are looking for speed in a golf cart, lean toward higher rpm's. Power is good and these big engines will produce more than anyone would want as far as torque goes. But if your looking for all out speed, you got to go with something that will produce high rpm's like a snowmobil (2 stroke) engine. Also, I hate the rear clutches on the ezgo's. They only allow the belt to go halfway down the sheaves before hitting a stop or ledge to ride on. Unlike the Yamaha rear clutches where the belt is allowed to completely move down the sheaves and hit the trans. drive shaft (more rpm's).
 

Grizzley

Member
You know BU has to have a supplier for these gears, wonder where they get them? (evil grin appears)
 

TheNewGuy

New Member
The price is way too high. BUT being a machine shop guy I can say if I were to
setup to make them, I would have to sell lots of them before I could make any
money. Material cost, labor cost, heat treat, finish grinding. Just to recoup
the programing time would be lots.

I don't think there is that many being sold. Just my 2 cents.
 

Grizzley

Member
Well for 279.99 I would expect more than 5 to 6 MPH increase.
If the price was lower or the MPH increase was higher then I could see a possibility of them being worth the effort and money. I do understand that we are talking CARTS here and not vehicles, but that is a vehicle price on a cart upgrade. IMHO

Gregg
 

Bob-o

New Member
Wow, BU is in it for the money aren't they LOL. Their a 250 option on new cars, or 300 installed afterwards. That includes labor from us, shipping, and tax. Too bad BU's price is starting price, add on their rediculous shipping and tax then your over our installed price by quite a bit.

I can't say it over there, but in all reality it is cheaper to buy everything they have from a dealer. It shouldn't be that way, but it is. BU's shipping and tax makes everything they sell more expensive than what you can pick up from a dealer. Here are a few examples:

Steering column cover from us: 27 Installed; Them 22.99 plus 17 shipping and tax

THis one is funny: Billet Aluminum Choke plate: us 25 installed; them 29 now start adding shipping and tax

Also, Chrome Sand Bottle Holder: Us 20 installed, them 13 plus 16 shipping and tax

My favorite one though is two tone seat assembly Us. 230; them 250 plus and plus
 
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