Front battery packRear motor bayCockpit detailRoad testEV gauge podUndercarrriageMaster cutoff switchEVCCON 2011
OwnerKriss Motors
Owner's Other EV1969 Saab Sonett V4
LocationMiami, Florida United States map
Web/EmailWebPage email image
Vehicle1957 Porsche 356A Speedster
Based on Special Editions Beck replica kit (chassis,
body, finished cockpit) following the original Porsche
design. All new parts, no donor vehicle. Judged BEST
Motor AC50 3-Phase AC
Regenerative braking triggered by pressure
transducer on master cylinder
DrivetrainModified VW transaxle 3.88, 4-speed; 3.11, 1.93,
1.22, .824 ratios
ControllerCurtis 1238-7501 with 1311 programmer
Dedicated supplemental chill plate and cooling fan to
achieve 550amp - 126v peak performance;
regenerative braking parameters are programmable
Batteries36 Thunder Sky 200AH, 3.50 Volt, Lithium Iron Phosphate
71mm form factor (now Sinopoly Battery); EVWorks
terminal connectors with Nord-Lock washers;
fiberglass battery boxes with Lexan covers
System Voltage126 Volts
ChargerElcon JCWC12624 (Chennic)
Charge to 131.4v, 3amp cutoff. Charges 110VAC at
15 amps; also 220VAC capability.
DC/DC Converter 400w, JCDI41-12012 (Chennic)
Separate cutoff switch
InstrumentationEVWorks (AU) ZEVA2 displays on original fuel
gauge and amps on tach, Curtis 840, temperature
gauge displays controller chill plate surface
temperature using Borg Warner WT533
Temperature Sensor, Xantrex LinkLite, RPMs on
tach driven by Westach magnetic sensor
Top Speed110 MPH (176 KPH)
Top speed not tested, estimate based on gear ratio
and torque capacity of motor; tested to 70 mph
AccelerationVerified EVCCON 1/4 mile 22.57 seconds, final speed
61.9 mph
Range125 Miles (201 Kilometers)
Average 1.6Ah/mile with 200Ah pack for 125 mile
maximum range; practical 80%DOD range estimated
at 100 miles based on test drives in hilly terrain,
various ambient temperatures, and 45mph average
Watt Hours/Mile225 Wh/Mile
See white paper entitled
full discussion of vehicle efficiency
EV Miles
Current:1,700 Miles (2,735 Kilometers)
    As of 10/4/2015
Seating Capacitytwo, roadster
Curb Weight2,009 Pounds (913 Kilograms)
Verified EVCCON racing weigh-in with 49.5/50.5
front/rear balance. Electric version of the 1957
Porsche 356A Speedster is approximately 250 lbs
heavier than the original with full gas tank.
TiresGoodrich 155/80/15
Conversion Timesix months (Kriss Motors) assembly time only, not
planning, procurement, testing, etc.
Conversion Cost$70,000 inclusive of base vehicle; all new parts.
Additional FeaturesKoni coilover shocks, disc brakes front and rear;
Chennic foot controller, Hall Effect 0-5v model
JCTH; Tyco Kilovac contactor relay model
LEV200A5NAA; heavy duty cutoff switch
GIM2304A; Nord-Lock steel washers for battery
terminals NL8sp; custom fiberglass battery boxes
with Lexan covers; Ferraz Shawmut fuse A3T500
rated 300v 500a; Marinco plug, 125v onboard
charger inlet 150BBIW; cockpit fire extinguisher;
EVWorks braided cell interconnects; 500lb
pressure transducer for regenerative braking;
electric cooling fan Comair Rotron JQ12B4 placed
under controller chill plate; custom 10x13x3
aluminum chill plate for controller; adapter with
taper lock, spacer, hub, key, custom machined by
Cape Precision; front hood straps replace locking
mechanism; custom shift and dash knobs;
traditional Porsche badges/emblems; LED signal
lights matched with power resistors.
No BMS system for lithium battery pack based on
pioneering research by Jack Rickard of EVTV; major
component selection follows Rickard's Speedster

More details at and Kriss
Motors WebPage

UPDATE 7-17: swapped kilometer speedometer for
one calibrated in miles, same classic VDO gauge

code by jerry