# Efficiency of my conversion

**URL:** <https://community.electricforum.com/t/efficiency-of-my-conversion/1021>\
**Category:** Conversion Kits\
**Created:** [October 24, 2008, 8:09pm UTC](https://community.electricforum.com/t/efficiency-of-my-conversion/1021 "2008-10-24T20:09:53Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![37fordelectric](https://avatars.discourse-cdn.com/v4/letter/3/9de053/32.png) [@37fordelectric](https://community.electricforum.com/u/37fordelectric)\
**Post date:** [October 24, 2008, 8:09pm UTC](https://community.electricforum.com/t/efficiency-of-my-conversion/1021/1 "2008-10-24T20:09:53Z")

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I converted my 1937 pu to a 144v dc system.  
I was curious how much less drag a new vehicle has.  
My truck draws about 100 amps at 35mph and 150 amps at 45mph on flat terrain.  
I would appriciate any comparison numbers you might have and what vehicle it is from.

Thanks

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**Author:** ![Tom\_Thomson](https://avatars.discourse-cdn.com/v4/letter/t/f6c823/32.png) [@Tom\_Thomson](https://community.electricforum.com/u/Tom_Thomson)\
**Post date:** [October 25, 2008, 12:13am UTC](https://community.electricforum.com/t/efficiency-of-my-conversion/1021/2 "2008-10-25T00:13:47Z")

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37pu  
My 924 Porsche (3160#) draws 100A and 80V @ 35mph.  
By the way, I have LRR Nokian tires which ride like brick bats but the car will coast over 1/4 mi from 30mph tommyt

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**Author:** ![37fordelectric](https://avatars.discourse-cdn.com/v4/letter/3/9de053/32.png) [@37fordelectric](https://community.electricforum.com/u/37fordelectric)\
**Post date:** [October 26, 2008, 7:42pm UTC](https://community.electricforum.com/t/efficiency-of-my-conversion/1021/3 "2008-10-26T19:42:00Z")

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Thanks for the reply.  
I had a feeling I was fighting forces.  
I think that I am going to have to look into some lower rolling resistant tires.  
My truck is almost stock right now, including tube tires. It is a fun work in progress.  
Joel

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**Author:** ![BBrown](https://avatars.discourse-cdn.com/v4/letter/b/f07891/32.png) [@BBrown](https://community.electricforum.com/u/BBrown)\
**Post date:** [October 27, 2008, 5:31pm UTC](https://community.electricforum.com/t/efficiency-of-my-conversion/1021/4 "2008-10-27T17:31:20Z")

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I’m afraid I can’t be much help. There isn’t a 100 yards of flat anything anywhere around here. My 1999 S10 pickup sees numbers quite a bit higher half the time. (The other half they are close to nothing.)  
Bob

'37 pickup sounds cool!

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**Author:** ![Bombardier](https://avatars.discourse-cdn.com/v4/letter/b/f07891/32.png) [@Bombardier](https://community.electricforum.com/u/Bombardier)\
**Post date:** [October 28, 2008, 8:11pm UTC](https://community.electricforum.com/t/efficiency-of-my-conversion/1021/5 "2008-10-28T20:11:52Z")

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Michelin tyres claim a 25% less rolling resistance form their silicone based compound.

May be worth a look.