Hello you awesome people,
I'm on the hunt for lots of info to build a very special car with very special needs.
Our small team wants to build a specific car to raise funds for an organization focused on children's wellbeing.
Of course we need to check the viability and cost involved, to inform our sponsors. You could consider this a charity start-up.
The team is technically, mechanically, and fabricationally (is that even a word?) skilled. Help is all around us.
The car in question is a 90's compact car, small petrol engine, manual gearbox, fwd, 1000kg driveable. It has a smaller tire size. (185cm circumference).
The Aerodynamics will be taken care of to bring it to much higher levels of efficiency.
The car will be purpose built, so no extra weight, no luxery for the driver... Basically, an empty shell to build on.
The car will be used for international long distance Road rallies. (+10h driving) The goal is to have a large range, short charging time, and high speeds. Since the end goal is the lowest time to arrival.
So charge fast, drive fast (sub 120mph). And efficient
I am a petrolhead at heart and this electric stuff is very new to me.. but basically the build has yet to start so we are open to any direction regarding parts etc.
So here are the questions I hope you can answer before we continue.
Efficiency factors:
- tire size, does it make much of a difference to change circumference / width
(To like i3, 155 wide, 220cm circumference).
I know it does with an ICE, so I'm guessing YES
- is there an efficient rev range in electric motors?
- size of motor or way of driving for longest range?
- most efficient air / water cooled Netgain?
HyPer9 is available in Europe.
- any other motors you would advise? Preferably available with controller as pack
- gearbox or direct drive? (HyPer9 diff 1:5 or 1:7)
See also 2nd question/ efficient rev range
- gearbox with straight cut gears worth the investment?
- is rwd more efficient in EV's ( enough to convert, because I could)?
- I understand Tesla units are the most efficient, but need a very expensive controller? And they are also aircooled?
Range:
- size & type of battery pack (I'm thinking Tesla all day long?)
You guys probably can advise when the weight outweighs the advantages of range.
I think the car could haul about 16 Tesla modules.
We would love to surpass 400miles range.
- is a 130v motor more/less efficient than a 400v with the same battery pack (say 16 cells, differently connected of course )
- dual packs, dual loading system? Halve the charging time.
- what would be the charging (stopped) time, and to what % would you advise loading?
- is it possible to add an extra pack when a very long run is planned? (I don't mean plug&play, since there is cooling etc...)
- solar panels on car efficient? kWh?
Thank you for answering all the previous.
I thought it was best to ask most questions at once, instead of scattered throughout the thread.
There is, however, more to come.
Can you please advise before we proceed so we can steer this build in the right direction before electrifying?
We really need the expertise on this forum to succeed...
We would thus like to eliminate most of trial&error and go straight to Kick-Ass build/ end product.
I have been reading A LOT already (most of it on this forum, love the Wiki), please excuse me for wanting to repeat the same questions (if that sort of thing annoys you). But I would rather have all the answers in one place to document.
That way we can anticipate (and stretch) the budget.
And this makes it also possible for everybody interested or involved to understand the complete build (not just the person who did al the research. aka myself) and form their opninions on all the options and considerations. Hopefully you all understand.
So hey, what would be the setup of YOUR dreams for our goals?
Thank you all very very much!
