Gross Laden Weight - NA

jspence · Post by **jspence** » Sat Sep 29, 2012 6:07 pm

Does anyone know the Gross Laden Weight of a 1993 NA 1.6 MX5? It is also known as GVWR(gross vehicle weight rating) or GVM (gross vehicle mass)
I have weighed mine mine with the hard top on and it was 995kg with about 1/4 of a tank of fuel. The Certificate of registration for my car lists the GVM of 1050kg, which is close to what it would weigh with no occupants and a full tank of gas.
I have spoken to Mazda, but they cannot tell me the the GVM.

Your help would be much appreciated

jspence · Post by **jspence** » Sat Sep 29, 2012 8:51 pm

Ooops I used the wrong numbers. The weight of my car is:
Hard top on 1017 kg
Hard top off 995 kg

Donovan · Post by **Donovan** » Sun Sep 30, 2012 11:14 am

Wow, I weighed my 1990 NA6C before undergoing the knife, and with 14" wheels, no in the car, but a hardtop on it, it weighed 960kg.

It had no AC or power steer, and only manual windows.

WideOpenThrottle · Post by **WideOpenThrottle** » Sun Sep 30, 2012 6:18 pm

Try here

http://en.wikipedia.org/wiki/Mazda_MX-5

forum.miata.net › ... › MX-5 Miata Discussion › NA (1989-1997)

jspence · Post by **jspence** » Tue Oct 02, 2012 10:42 am

The car has power steering and AC, so I expect that is some of the weight difference.
The GMV on my registration papers is 1050. This should be the wight including passengers and luggage. However with a full tank of gas and the hard top on it would be very close to 1050 without any passengers and luggage.

The reason I am asking the question is that I am converting it to electric, and the electric vehicle certifier needs to know the Gross laden weight. If I can keep it below this figure with 160kg for two passengers it is OK, otherwise the certification becomes more complex and expensive.

The motor will be 75kW and will be very similar in performance to original. The total weight will go up by about 100- 150kg.

Can anyone provide the GMV that is listed on their registration papers for a NA and their year. I am wondering if mine is incorrect.

Thanks
john

WideOpenThrottle · Post by **WideOpenThrottle** » Tue Oct 02, 2012 10:48 am

When i re-vin'd my car i had to provide the weight so i went to the local tip & for $10.00 they gave me a print-out of its weight.
Do the same...its the easiest way forward.

Snapfrozen · Post by **Snapfrozen** » Tue Oct 02, 2012 7:45 pm

jspence wrote:The car has power steering and AC, so I expect that is some of the weight difference.
The GMV on my registration papers is 1050. This should be the wight including passengers and luggage. However with a full tank of gas and the hard top on it would be very close to 1050 without any passengers and luggage.

The reason I am asking the question is that I am converting it to electric, and the electric vehicle certifier needs to know the Gross laden weight. If I can keep it below this figure with 160kg for two passengers it is OK, otherwise the certification becomes more complex and expensive.

The motor will be 75kW and will be very similar in performance to original. The total weight will go up by about 100- 150kg.

Can anyone provide the GMV that is listed on their registration papers for a NA and their year. I am wondering if mine is incorrect.

Thanks
john

Feel free to provide me your registration# and I can check a few of the LTSA databases for you

Might only turn up the same results you have already

jspence · Post by **jspence** » Thu Oct 11, 2012 11:52 am

I have an update on the GVM issue:
Mada here in Christchurch and head office in Auckland were able to give me a curb weight of 983kg. They were unable to provide a GVM. The 983kg curb weight would be correct for the New Zealand new models which didn't have hard tops, power steering and AC.

I had an email back from Mazda Japan last night stating the GVWR for my Chassis number is 1060kg. This is about 10kg over the curb weight of my car with all its options, rear wing, new tyres, and a full tank of fuel.
I am now going to assume that there is no GVM for this vehicle, as per Mazda, and talk to the certifier again.

Donovan · Post by **Donovan** » Thu Oct 11, 2012 7:08 pm

Silly question, but why does the certifier want the GVM, why can't he just work off what the weight of the car is now?

jspence · Post by **jspence** » Fri Oct 12, 2012 8:18 am

To meet the LVVTA standard the vehicle must be less than the GVM after conversion including 2 x 80kg passengers.

Donovan · Post by **Donovan** » Fri Oct 12, 2012 8:23 am

Is this only a standard that applies for when converting to Electric powered?

WideOpenThrottle · Post by **WideOpenThrottle** » Fri Oct 12, 2012 12:43 pm

jspence wrote:To meet the LVVTA standard the vehicle must be less than the GVM after conversion including 2 x 80kg passengers.

.

Is your certifier saying that regardless of what you do it has to be less weight than the original factory weight or what?

Why don't you go and weigh your vehicle as i earlier posted?..is it not drive-able?

jspence · Post by **jspence** » Fri Oct 12, 2012 3:33 pm

I put it on the scales and these were the figures
Hard top on 1017 kg
Hard top off 995 kg
At the time it had just a fraction less than 1/4 of a tank of fuel.

The standard can be found here:
http://www.lvvta.org.nz/documents/stand ... hicles.pdf
It is not the only standard but the main one for electric vehicle conversion, as some of the changes could affect other systems in the vehicle.
The full list of standards are availiable here:
http://www.lvvta.org.nz/documents.html#standards

The MX5 is a good choice for electric conversion as many have already been done. There are even adapter plates for the most common electric motors to connect to the orginal transmission. Some of the motor options availiable could give you 2 or 3 times the original horsepower, although at that power the range would be limited. Ideal for racing though.

jspence · Post by **jspence** » Fri Oct 12, 2012 3:37 pm

The secion of the standard that deals with weight is:
An electrically‐powered low volume vehicle must not exceed the vehicle
manufacturer’s gross vehicle mass or either of the vehicle manufacturer’s axle ratings, for that make and model of vehicle.

At present the certifier is stating that I can't exceed the GVM.

jspence · Post by **jspence** » Fri Oct 12, 2012 3:41 pm

And this part too:
NOTE 2: When weighing a vehicle to determine that the manufacturer’s GVM has not been exceeded, a simulated occupant weight of 80 Kg must be applied to each seating position, and any equipment must be in its maximum weight state, such as full water storage tanks.

jspence · Post by **jspence** » Fri Oct 12, 2012 3:51 pm

For my design the final weight of the car will be:
Curb weight after conversion 1091kg
+ 2passengers @80kg = 160kg
Final weight 1251kg
To pass the standard the final weight must be less than the GVM which is 1060 for my car from Mazda. The GVM given to me by Mazda is really the curb weight without passengers as they dont have a figure for this.

I expect my car standard is about 1050kg with a full tank of gas, new tyres, and washer bottles full etc.

WideOpenThrottle · Post by **WideOpenThrottle** » Fri Oct 12, 2012 3:53 pm

So its all to do with the massive amount of potential battery weight plus engine etc.

You really need to know the weight of your mods less the weight of what you are taking out to fit the mods.

Then you will know whether it will still be under an irrelevant GVM.

Badcat · Post by **Badcat** » Fri Oct 12, 2012 8:22 pm

Will you be posting pics?
What would it cost?
I'm really intrigued!

jspence · Post by **jspence** » Sat Oct 13, 2012 12:13 pm

The project is quite expensive. I estimate about $25,000 for the parts. The batteries are about $11,500 and motor about $7500. Fortunately I can do most of the work myself, so there will be no labour in it.

I was planning on doing a series of videos on youtube as the project progresses, but can post some pics as well

Badcat · Post by **Badcat** » Sat Oct 13, 2012 12:14 pm

i'd be very interested to watch your progress.

tomtikki · Post by **tomtikki** » Sat Oct 13, 2012 4:53 pm

I'll definitely be following it, fantastic project. Good luck.

Gross Laden Weight - NA

Gross Laden Weight - NA

Electric mx5!

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