Computer question: After Re-Gear
Super Moderator
Joined: May 2004
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From: Central Coast of CA
No, no, no, Russ, of course not! But a lot of people, when they feel that "seat of pants" torque after a gear change, without really thinking about it, will often misstate what they feel as a gain in power.
I just wanted to make sure you understood that wasn't what was actually happening.
You started nothing!
And like Brent so aptly stated, this stuff that happens is common!
Stewart
I just wanted to make sure you understood that wasn't what was actually happening.
You started nothing!
And like Brent so aptly stated, this stuff that happens is common!
Stewart
Bleed Ford Blue
Joined: Apr 2009
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From: Anchorage Alaska
No, no, no, Russ, of course not! But a lot of people, when they feel that "seat of pants" torque after a gear change, without really thinking about it, will often misstate what they feel as a gain in power.
I just wanted to make sure you understood that wasn't what was actually happening.
I just wanted to make sure you understood that wasn't what was actually happening.
Of course not! its like your cordless drill, you have a 1-2 setting. when you put it on 1 (slower w/more tq) does that mean you have more power? nope, but your multiplying (best way i've ever heard of describing gearing down) the torque that the electric motor already puts out.
utilizing your power band in a different way then before.
Super Moderator
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From: Central Coast of CA
Slide it one way and you get full torque, slide it the other way and and it reduces the voltage from the battery to reduce the torque output.
Stewart
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From: Forest lake minnesota
Last edited by Bigpipes 35; Oct 26, 2013 at 10:01 PM. Reason: word change
Super Moderator
Joined: May 2004
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From: Central Coast of CA
Even funnier, I thought your post was meant in humor, talking about the gears!
Stewart
Stewart
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I did the 3.73 to 4.30 switch and wasn't impressed. I would have gone 4.56 if I could do it all over, especially if you are planning to to a bigger tire.
Frmr Ford Trans Engr
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From: SE Florida
Torque multiplication was just a poor choice of words and torque is rarely multiplied but an example of it is in a torque converter where the stator redirects the fluid and truly multiplies torque. There is no torque multiplication when going to lower gears, there is merely a shift of torque.
If there is 100 lb-ft of torque in the driveshaft with 3.73:1 gears there will be 373 lb-ft of torque in the axle shafts. If I change the gearing to 4.30:1 there will be 430 lb-ft of torque. That seems like multiplication to me.
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
So when I change the axle from a 3.73:1 to a 4.30:1 I don't get more torque in the axle shafts? My math seems to contradict this.
If there is 100 lb-ft of torque in the driveshaft with 3.73:1 gears there will be 373 lb-ft of torque in the axle shafts. If I change the gearing to 4.30:1 there will be 430 lb-ft of torque. That seems like multiplication to me.
If there is 100 lb-ft of torque in the driveshaft with 3.73:1 gears there will be 373 lb-ft of torque in the axle shafts. If I change the gearing to 4.30:1 there will be 430 lb-ft of torque. That seems like multiplication to me.
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From: Media PA
Good call James. Like Dave I too run 4.88s, but I was also running short tires (32") 275/65R18s. Our ToyHauler is tall and scales about 9500-10k and the Ex pulls it like a locomotive. We've been all through the mountains of New England, WV, TN and KY. "Tractive effort" to spare!
with this combo we have pulled from Philly to Savannah and back without the EX dropping out of OD a single time on the highway. We just swapped up to 35"s and made our first pull with them, the new "effective ratio" with the gears and larger tires is 4.39 and it still pulls fine but not quite as animal as it was. With your 6k trailer and 4.56s your rig should be pretty much unstoppable on those Southern mountains!
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Elder User
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From: North Florida
Good call James. Like Dave I too run 4.88s, but I was also running short tires (32") 275/65R18s. Our ToyHauler is tall and scales about 9500-10k and the Ex pulls it like a locomotive. We've been all through the mountains of New England, WV, TN and KY. "Tractive effort" to spare! with this combo we have pulled from Philly to Savannah and back without the EX dropping out of OD a single time on the highway. We just swapped up to 35"s and made our first pull with them, the new "effective ratio" with the gears and larger tires is 4.39 and it still pulls fine but not quite as animal as it was. With your 6k trailer and 4.56s your rig should be pretty much unstoppable on those Southern mountains!
with this combo we have pulled from Philly to Savannah and back without the EX dropping out of OD a single time on the highway. We just swapped up to 35"s and made our first pull with them, the new "effective ratio" with the gears and larger tires is 4.39 and it still pulls fine but not quite as animal as it was. With your 6k trailer and 4.56s your rig should be pretty much unstoppable on those Southern mountains!James
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