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johnev's Blog

A blog by johnev in General

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Electric Sprinting - Year 1

Entries in this blog

Sport E Sprinting - Dyno time

Finally, I have my Sport E repaired and working again - just in time to miss the season!  It's been a long haul - over 2 years actually. Last month I completed the wiring and so took the car over to Potenza Technology for electrical testing (my sponsor). Here is a picture of the car in the workshop alongside the original Westfield iRacer. The iRacer had been recently recommissioned (and painted) for a trade show. This is a quick car. About the same power and weight as today's Formula E cars
johnev

johnev

1

Sport E Sprinting - The rebuild (more welding than wiring so far)

Fixing the car has proven to be quite a task - big surprise! The chassis needed repair and modification to remount the diff, motor and new prop shaft and to add fixings for the new rollover cage. This involves welding - and a lot of it. So far I've used the services of an expert welder but this is expensive. This time I elected to do it myself - how hard can it be? I bought myself a Clark 151TE welder, some CO2 and Argon mix gas bottles and various wire sizes. After two months practice and a
johnev

johnev

3

Sport E Sprinting - Plan B

Back in July 2015 my Sport E electric Westfield was very badly damage due to a 'racing incident' at the Curborough sprint circuit. The car rolled three times and in the process ripped off or bent all four corners of the car. None of the wishbones, uprights or wheels escaped undamaged. In addition all the bodywork was broken in some way. On the face of it this was a total loss situation. However, amazingly all the electrical systems, motor and battery remained undamaged and in full working order.
johnev

johnev

3

Sport E Dyno Results and Electric Power

I'm busy rebuilding the battery pack with half the battery cells to reduce weight. While this is ongoing I thought I might share my dyno results from last year and talk a bit about electric power verses petrol power. The following graph shows power and torque against road speed. Remember the car has no gearbox. The motor is directly coupled to the diff. You can see that the graph ends at about 80mph. This was due to a software speed limit bug which was fixed before the sprint events. I have add
johnev

johnev

8

Electric Sprint Racing - Year 1

My first sprint event with the electric Westfield was at Croft. This is quite a long circuit so I wondered if one charge could last for a whole days sprinting? I also wondered what sort of reception the car would receive from the authorities. The MSA Blue Book has nothing to say about electric cars. In the end the scrutineers were diligent and helpful if a little bemused but they gave it the OK. On the way to the circuit for first practise all cars line up for the noise test. When it came to my
johnev

johnev

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