IVA Application Form

[peterol1]

Can anyone give me a steer on what the answer is to the following IVA questions please. details of my engine etc in my signature;

Q3s - What is the maximum design road speed of the vehicle.?

Q3t - What is the engine maximum power and the engine speed at which it is obtained (bph/rpm). ?

Q3u - What are the design weights of the vehicle
Axel 1 (lbs/Kg)
Axel 2 (lbs/Kg)
Gross (lbs/Kg)
Train (lbs/Kg)
Towable mass (lbs/Kg)

Any other tips/advice when filling in the forms greatly appreciated.

Many thanks,
Pete

[andicole0]

Hi Pete,

Not sure about the actual figures for your car but the max road speed is used to determine whether you have correctly rated tyres but can be worked out by using max revs, gearbox and diff ratio and wheel circumference. I'm sure someone will have the answer already worked out. Just make sure your tyres are rated for whatever max speed you put on the form.

Engine max power revs is used for the noise check which is done at 75% of the max power revs. So again make sure that the noise level is below 101Db (?) at that (75%) engine speed. Max power revs will depend on engine and build. a bog standard Chevy 350 taken from an old truck could be as low as 4000rpm but Vosa are fully aware of what most engines rev to. You will probably be asked for some sort of proof of that figure. Either from the engine builder or data from a recognised engine builders site. I used a print out from Summits site in the US. Vosa questioned it and there were raised eyebrows at the sva but it was accepted.

Design weights should be available from the kit manufacturer. If you don't supply a towable mass value you won't be allowed to tow a traier! I think you only need the first three weights listed.

HTH.

Andi.

[realyweely]

The design weights are in the Build manual at the back

[peterol1]

Thanks Tony and Andi,

My engine data sheet says max power is 300bhp/5500rpm. With my pipes on that will sound like a nuclear explosion and blow the db test...!

Thanks for pointing out the load data in the back of the manual Tony.

[jason barnes]

hi pete as you know mine failed iva hopefully should be ready to rebook by next weekend if all goes well.as for weights axle 1 600 axel 2 650 gross 1250 train 1750 mine is a 350 chevy and i put down 145mph 5200 rpm and that all went through ok.

[peterol1]

Many thanks for that Jason.
Hope all goes well with re re-test.
By the way, how did you get on with the re-engineering of the fuel cap..?

Keep us posted,
Cheers, Pete

[jason barnes]

hi pete no go my self spoke to chris of brasscraft and he said he is having 5 made up to go through iva fingers crossed should be this week.