Weight

[Davidbolam]

I'm just about to fill in my IVA form but not sure what weights shall I put down on my IVA form?

what has anyone else done for this?

David

[Peter-C]

I put down 450 kg, 450 kg and 900 kg gross. This is the same as on my manufactures plate. The examiner said that was ok.

[K4KEV]

yep they are the numbers I used.... BUT the way I built mine sent my rear axle weight over but being the manufacturer you can just write it down on a piece of paper informing them /him of a specification change:D

[Davidbolam]

Thanks for the replies

I will fill out the forms hopefully this weekend


David

[Stot]

I did the same. My MX5 build is weighing in at ~620kg without fuel so if there is more than 450 over the back something is up!

Cheers
Stot

[baz-r]

i put the same as thats in the book and i pased fine even with a 35l fuel tank

axle 1=450kg
axle 2=450kg
total = 900kg

[flyerncle]

It does not make sense the weights being the same,if you put both axles at the same weight then the DGW is say 900 kg one axle would possibly be overloaded ie the front one.

[skov]

450 / 450 / 900 worked for me.

[flyerncle]

After thinking about it,its probably good numbers and maybe a little high for the rear.

[snapper]

The axle weights are the max fully loaded that the car is designed to take not the actual as measured
Weights include full fuel tank 25 to 35Kg
Driver and passenger 75Kg each
Luggage 25Kg each

Design weights for IVA are used to find if the build is within design limits and also to work out the brake bias when tested on the brake rollers
As axle weights are measured on the rollers and one axle is on the hard standing there is a slight lever effect

[flyerncle]

As I said above if you weigh the axles as they are the weights are probably somewhere near,what you put down for axle weights is the DGW and and this should not be exceeded.

It would be interesting to put one on an ATL brake tester and see what the axles actually weigh.

[Stot]

As I said above if you weigh the axles as they are the weights are probably somewhere near,what you put down for axle weights is the DGW and and this should not be exceeded.

It would be interesting to put one on an ATL brake tester and see what the axles actually weigh.

My car comes in at Front 320kg rear 300kg total 620kg as made but the declared weights on the IVA form were 450/450/900 so nothing should be overloaded.

These numbers are up to us at the end of the day and if we wanted to put 550/550/1100 we could. If a car is reaching the 450/450 range its probably been built to cope with a lot more anyway.

Cheers
Stot

[skov]

Mine came in at a very similar weight to Stot's.
Here's the test sheet from my IVA. This is from my first attempt that failed due to dodgy brakes :rolleyes: Sadly I didn't get a copy of this when I passed:

https://lh4.googleusercontent.com/-q8MdRvRR1N0/UcmaA_L3eWI/AAAAAAAAKcA/zhppQ7Becq0/s800/iva_brake_fail.jpg

[flyerncle]

Looks like an ATL brake tester was used as the kerb weight and unladen axle weights are on the sheet,as I posted the weights of 450/450 are good figures and leave plenty of room for extra weight.

Its working against you if the brake readings are low,it can be worked out from weights and brake force easily.

You have the MAC cert so its all handy for others to know.

If you used 550/550 -1100 kg you would need a total service brake force of approx 640 kg to give 58% rate to pass.

[skov]

To be fair I failed because there were a couple of problems with my brakes :o
Once I fixed those it passed easily enough.

[flyerncle]

You passed !! One of these days I will be able to say the same ;)

Like I said its good for others to see what can and will happen.:eek: