|
Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
|
Thread Tools | Display Modes |
11-30-2017, 12:19 AM | #1 |
Gone Wild
Join Date: Jun 2015
Location: Philippines
Posts: 570
|
High speed gear installed
After a lot of hesitation, I decided to installed a 8:1 high speed gear on a stock G15-A...
The G15-A is a Japanese Yamaha which is a mix of several for the US:
Prior to this installation:
Please note, original wheels (8" rims) are in place and no lift kit. As there is no 8:1 kit for the G11-A, I ordered for G9-A. If the small gear is exactly the same, the center hole of the large gear must be increased a bit; I had it done in a machine shop... Once all installed, here are my first remarks:
I was hesitating installing such gear as I never found someone who did it without swapping a bigger engine and my conclusion is that it is something to do, even on a cart with the stock engine! From there, I do not really want to hit the highest speed, and let say 40/45 Km/h is really the best for the region. I use this cart daily as my main transportation mean. For different reasons, I shall put back the original sliding sheave and see what it does. Of course I shall post about it later... I did not test neither this new configuration with 3 "heavy passengers" () but shall post as soon as I try... Would you have any question... |
Today | |
Sponsored Links
__________________
This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum |
|
11-30-2017, 07:33 AM | #2 |
Gone Wild
Join Date: Apr 2014
Location: Ohio
Posts: 960
|
Re: High speed gear installed
Did you have a chance to clock your speed before all the changes?
|
11-30-2017, 10:31 AM | #3 |
Gone Wild
Join Date: Jun 2015
Location: Philippines
Posts: 570
|
Re: High speed gear installed
Yes, I was 28 Km/h (17 mph), but around 4,500 rpm...
...BUT to remove the transmission and put it back, we must remove the governor so its setting, of course, becomes different after the operation! Now there is something I did not think about is that I have a RPM in the engine compartment so tomorrow, I shall see at what rpm I go, but I suspect I was around 3,750... I shall see tomorrow (night here). Anyway the purpose of this post - and I would have liked to know it before, I would not have waited more than a year - is that we can install a 8:1 with the original engine, it easily support it. ...and it is, by far, more efficient than to change the wheel size!!! For me, it was different, the frame/suspension/steering are totally different than US versions. To create a lift would have been a nightmare and, by the way, I use it in town and do not like the lifted look. |
12-02-2017, 09:37 PM | #4 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,443
|
Re: High speed gear installed
Putting 22-23 tires on is about the same as 8:1 gears and stock tires. Yes, about 30mph.
The cut sheave will help at very low speeds say 0-5mph. It gives a lower low gear when you take off, tow, or climb very steep hills. Otherwise it does nothing much different at high speeds. So it should be ideal for your HS gears and give you back nearly the same power at 0-5mph as you had with stock gears. The HD kevlar belt will also do that a little because it is slightly wider and rides little higher on the secondary. |
12-04-2017, 09:45 AM | #5 |
Gone Wild
Join Date: Jun 2015
Location: Philippines
Posts: 570
|
Re: High speed gear installed
Not really the speed calculator of this site calculates:
This being said, I am not surprised by their calculation, according to Maths:
It is very clear than changing the gear ration from 12.5:1 to 8:1, is BY FAR more efficient than changing the tire size (not talking about the cost difference)! |
01-27-2018, 05:52 AM | #6 |
Gone Wild
Join Date: Jun 2015
Location: Philippines
Posts: 570
|
Re: High speed gear installed
After almost 2 months, no trouble when we are 4 persons plus a child onboard , the engine is powerful enought.
Having installed back the original sliding sheave instead of the machined one, I cannot see much difference concerning the torque... IMHO, a waste of buck$ but again, the region is flat! |
02-20-2019, 03:46 PM | #7 |
Not Yet Wild
Join Date: May 2018
Posts: 38
|
Re: High speed gear installed
Anyone installed this on a lifted 23” wheeled lifted tire?
Sent from my iPhone using Tapatalk |
02-20-2019, 04:45 PM | #8 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
|
Re: High speed gear installed
Torque will suck with high speed gears, stock engine, huge tires.
|
02-20-2019, 05:22 PM | #9 |
Gone Wild
Join Date: Jul 2017
Location: East Central Missouri
Posts: 1,955
|
Re: High speed gear installed
Agreed. The 23" versus 18.5" tires will tax the stock engine enough. The gear change might even lower top speed if the engine can't pull it.
I didn't install 8:1 with 23" tires until I installed a 23hp engine. |
02-20-2019, 05:44 PM | #10 |
Not Yet Wild
Join Date: May 2018
Posts: 38
|
Re: High speed gear installed
Ok I figured so but was hoping. Haha
Sent from my iPhone using Tapatalk |
|
|
Similar Threads | ||||
Thread | Forum | |||
D&D PDS High Speed Motor and 8:1 High Speed Gear Experiment... | Electric EZGO | |||
Top Speed with high speed gear and D&D Torque Motor | Electric EZGO | |||
8.1 high speed gear | Gas Club Car | |||
Anyone need High Speed gear set for G1-a? | Golf Carts and Parts | |||
High Speed Gear Kit Help | Gas Yamaha |