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Old 11-24-2017, 07:18 PM   #1
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Default Adjustable rear toe modification?

Hello, I need to have the rear toe adjustable because my HPI Sprint 2 tends to have unpredictable random steering. It runs like a boat because the too much inward toe makes the rear end "float" because each side tries to push the car to the center.

Anyway after a testing I found out that the solution to my problem is to have zero toe on my wheels. On the internet I have seen some guys have adjustable rear toe but the Sprint 2 doesn't.

So I need to figure out how to adjust it maybe putting parts like the front wheels but without the servo. If you have any STL files to 3D print the rear suspension arms a little differently, would solve the problem too!
If you know how to do this mod please tell me
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Old 11-24-2017, 08:17 PM   #2
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Starting a second thread about your car isn't necessary.
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Old 11-24-2017, 10:22 PM   #3
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Pretty much every chassis with IRS has some amount of rear toe-in, without it the car will be very unstable at speed

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Old 11-24-2017, 10:58 PM   #4
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More than likely, your steering issue is not because of rear toe. If any, it makes the car stable. It must be set at 3 degree toe in. I heard that Sprint has quite a wobble in the front wheels and it does not center well. You may want to check your servo to see if it has enough torque. It might help if you describe what you meant by unpredictable steering.
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Old 11-24-2017, 11:02 PM   #5
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How many degrees toe does it have now?
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Old 11-24-2017, 11:51 PM   #6
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Quote:
Originally Posted by snuvet75 View Post
More than likely, your steering issue is not because of rear toe. If any, it makes the car stable. It must be set at 3 degree toe in. I heard that Sprint has quite a wobble in the front wheels and it does not center well. You may want to check your servo to see if it has enough torque. It might help if you describe what you meant by unpredictable steering.
They've got more info and some videos in the other thread on this same issue.
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Old 11-25-2017, 01:58 AM   #7
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Again, the video's you showed have nothing to do with the setup of the car but more with the play or electronics.
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Old 11-25-2017, 05:38 AM   #8
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Guys thanx for all the replies, but it's not the electronics or the servo, or the floppiness of the steering system, I am saying this for sure because the exact same thing was happening when I DISCONNECTED the servo and locked in place the front wheels with wires so they stay dead straight. After some testing making the rear toe much less, the car finally started going straight without unpredictable course changes. In theory you must be right (maybe for a heavier car) but I really couldn't go straight before decreasing the toe!

Don't know how many degrees toe is this but this is the before and after:


Here's the original thread I opened, has some videos in there too. I opened this thread because I thought was a different subject looking for a mod for adjustable rear toe.
http://www.rctech.net/forum/electric...l#post15086765
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adjust rear toe, hpi sprint 2, rear toe, rear toe mod


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