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 Post subject: torque steer?
PostPosted: May 4, 2017, 7:19 pm 
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Joined: September 22, 2005, 10:29 am
Posts: 599
So if one were to mount a bike motor transversely with a direct (guibo) connection to the rear axle, on most bikes one would end up with a left weight bias - not so great on a left-driver car. So what if you were to shift the entire thing over a bit to compensate? You'd end up with unequal half-shafts, which I understand isn't so hot - particularly in front-engined situations. Does anyone have knowledge and/or experience that can be brought to bear here? Is it a big no-no, or not really a thing in RWD applications?

On a related note, does anyone make a rear axle without a really long nose cone? What can be done to get the motor close to the axle without using a chain?


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 Post subject: Re: torque steer?
PostPosted: May 5, 2017, 10:21 pm 
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Joined: June 8, 2010, 8:02 pm
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Location: White Rock, BC, Canada
kreb wrote:
So if one were to mount a bike motor transversely with a direct (guibo) connection to the rear axle, on most bikes one would end up with a left weight bias - not so great on a left-driver car. So what if you were to shift the entire thing over a bit to compensate? You'd end up with unequal half-shafts, which I understand isn't so hot - particularly in front-engined situations. Does anyone have knowledge and/or experience that can be brought to bear here? Is it a big no-no, or not really a thing in RWD applications?

On a related note, does anyone make a rear axle without a really long nose cone? What can be done to get the motor close to the axle without using a chain?



The FWD torque steer does not apply to RWD applications unless your toe-control in the rear is deflecting (which it certainly shouldn't). What does apply is axle-torsion and it's effects. Basically axles twist when loaded, and different length axles would need their thicknesses adjusted so that they twist the same amount. Also, I *think* Torsen diffs hate unequal torsion.

Pretty sure the FSAE guys have dealt with this. Maybe peruse their forums about it.


The smart-ass in me says that BEC have no torque so can't twist anything enough to worry about....... :mrgreen:

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 Post subject: Re: torque steer?
PostPosted: May 11, 2017, 7:11 am 
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Joined: May 13, 2016, 9:28 pm
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I've looked at suburu diffs that had a long housing nose leading up to the flange. Vinny


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 Post subject: Re: torque steer?
PostPosted: May 11, 2017, 11:28 am 
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Joined: April 26, 2008, 6:06 pm
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Location: Under the weather. (Seattle)
To the best of my (limited) knowledge, while less than ideal, it's not really a major problem either. Especially when you're not talking about crazy inputs. Alternatively, you can run equal length short axles, and a jack-shaft to equalize the axle pickups...Something sort of like this.

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