Re: Direct Drive Van under construction

[Daniel F Sartain <dfsartain@JUNO.COM>]

My RX-7 with a ADC 9" was not adequate  accellerating from a dead stop in
4th gear 1:1 for keeping up with city traffic.  I would at leats suggest
gearing that maxed out the rpm at his absolute max speed (say 55mph) if
he insists on one ratio only.
On Mon, 30 Mar 1998 10:31:47 +1000 steve downing <downing@RSC.ANU.EDU.AU>
writes:
>>Date: Wed, 25 Mar 1998 17:52:02
>>To: E.V.
>>From: steve downing <downing@rsc.anu.edu.au>
>>Subject: Direct Drive Van under construction
>>
>>        My friend Karl, is more than 3/4 of the way through
>converting
>>a Nissan Vanette to a direct drive electric. He is using an ADC 9",
>>144 volts of T145's and a curtis 1231c.
>>
>>With the motor close coupled to the diff. and mounted on a swing-arm
>frame,
>> he estimates the motor will be going 5,500 RPM at 120 klm/hr(75
>mil/hr).
>>The diff ratio is 4.6:1, but there is a 5.1:1 from a similar model
>that
>>might be made to fit. The all up weight will be  4,100 lbs (1870
>kg)empty.
>>
>>        I am concerned that with the present gearing, that in city
>driving
>>that he will be operating in a low RPM and high current situation a
>lot of
>>the time, and the curtis 1231 will be hammering itself to death in
>very
>>narrow PWM every time he pulls away with that big mass.
>>
>>        Last time I saw him I suggested he use a gearbox, but he has
>>already installed the rear battery box clear across the transmission
>>tunnel,and really wants to retain the rear motor position.
>>
>>        What do people on the list think? will this work OK, or will
>he
>>need the other diff ratio.
>>
>> I think that a single planetry gear set out of an automatic, in a
>custom
>housing
>> with a clutch pedal cylinder controlling the band giving him two
>ratio's
>>between the motor and the diff, would seem ideal ie.(1.7:1or1.4:1)
>>multiplied by the diff. = 7.82:1 in low gear and 6.44 in high.
>>
>>Will this need an oil pump, or would splash lube be enough? and
>possibly
>>a 3.2:1 diff would be a better match?
>>
>>        Regards Steve Downing
>>
>
>
>
>Steve Downing
>downing@rsc.anu.edu.au
>
>Direct Drive Van under construction
>

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Re: Direct Drive Van under construction