I have a pro street car that has an early Mustang II front suspension with manual steering rack. I bought the car from the guy who built it and did a nice job on most everything. I had the car shipped to me and first thing I started to drive it and at about 20-25 mph the road was a little bumpy and that sucker wanted to pitch itself to the shoulder of the road. I did give it a bit of gas when it did this but if I feather the throttle I can creep up to 70 mph and it doesn't bump steer but I sure don't feel safe even with it having a full roll cage. So say I'm cruising at a steady 40 mph and hit the throttle then in a couple seconds it gets very violent and scary heading for the shoulder of the road. It's a really cool car but I spent so much getting the car I really don't have the dough right now to have a high-end hot rod shop fix it. The front wheels look straight but when I called the guy, I bought the car from and I was not happy because I asked him before I bought it if he had any issues with the Mustang II front end. So, he said he never put it on an alignment rack and thought maybe he installed the rack to far forward of back to far. I took from front tires of and coil over shocks and ran the suspension up and down and the steering wheel went nuts back and forth. So, any suggestions on something I might be able to check out please let me know. I will not drive it this way. So the lower control arm should or should not run parallel with the steering tie rods? With thanks, Jason 1960 Hillman Husky 2 door wagon pro street car with SBC/9" rear end, tunnel ran 2 carbs. hood scoop, TH-350 trans ect ect
Thanks for the in depth explanation. As you discuss in one of your other videos, antidive angles the upper control arm so the ball joints would not be aligned as seen in the front view at 5:44. In this case, should the tie rod geometry be based off of the line through the forward ball joint, the rear ball joint, or in between the two?
Awesome video but some people may have a hard time understanding your english. I would suggest maybe putting subtitles on your video for the people who don't know how to turn subtitles on for UA-cam.
Excellent explanation. I'll admit, I had to listen a few times to fully digest the information. I do have one question, would placing a vehicle with a bump steer condition due to something bent (from a pot hole) on an alignment machine show where the bent component is? Simply, will the alignment machine show the cause of the bump steer?
An alignment machine can show SAI. Or steering axis inclination, which can indicate a bent strut or steering knuckle, when the measured angle is shown to be out of spec. It also can measure included angle, which is SAI including a camber measurement. Generally you use the measurements and visual inspection to determine bent steering and suspension components.
A company car I drove years ago, a Nissan Dualis had shocking bump steer and since I live in Australia the freeways are quite undulated and it was difficult to keep in my lane sometimes when going over bumps. It also had the opposite to bottoming out on the bump stops, not sure on what term should be used but when coming out of a bump or dip or even dropping off a speed hump the struts would fully extent and run out of travel and make a big clunk, as if the height of the SUV was not accounted for when selecting for shocker length when they designed the car. My best guess is perhaps they used the front end out of previous sedan model or something and not redesigned it to suit SUV ride height and just made it fit.
Ok so I definitely have an issue When my truck is up on jack the front toes But when I set it back down it goes to 0 toe I took a look at the tie rod angle and it’s a little off from the lower control arm I guess this makes sense on why the truck darts across the freeway on bumps
Nice clean drawings that made me completely understood all aspects of bumpsteer. Thank you man.
I have a pro street car that has an early Mustang II front suspension with manual steering rack. I bought the car from the guy who built it and did a nice job on most everything. I had the car shipped to me and first thing I started to drive it and at about 20-25 mph the road was a little bumpy and that sucker wanted to pitch itself to the shoulder of the road. I did give it a bit of gas when it did this but if I feather the throttle I can creep up to 70 mph and it doesn't bump steer but I sure don't feel safe even with it having a full roll cage. So say I'm cruising at a steady 40 mph and hit the throttle then in a couple seconds it gets very violent and scary heading for the shoulder of the road. It's a really cool car but I spent so much getting the car I really don't have the dough right now to have a high-end hot rod shop fix it. The front wheels look straight but when I called the guy, I bought the car from and I was not happy because I asked him before I bought it if he had any issues with the Mustang II front end. So, he said he never put it on an alignment rack and thought maybe he installed the rack to far forward of back to far. I took from front tires of and coil over shocks and ran the suspension up and down and the steering wheel went nuts back and forth. So, any suggestions on something I might be able to check out please let me know. I will not drive it this way. So the lower control arm should or should not run parallel with the steering tie rods? With thanks, Jason 1960 Hillman Husky 2 door wagon pro street car with SBC/9" rear end, tunnel ran 2 carbs. hood scoop, TH-350 trans ect ect
I put wider lower control arms on my car and was fighting bump steer for some time, this video clears up all my questions! Thanks
very good presentation, how to do feel about after market upper control arm replacement for 2022 isuzu dmax, all best
I enjoy your videos, very informative, explained plainly and thoroughly!
Glad you like them!
Thanks for the in depth explanation. As you discuss in one of your other videos, antidive angles the upper control arm so the ball joints would not be aligned as seen in the front view at 5:44. In this case, should the tie rod geometry be based off of the line through the forward ball joint, the rear ball joint, or in between the two?
Awesome video but some people may have a hard time understanding your english. I would suggest maybe putting subtitles on your video for the people who don't know how to turn subtitles on for UA-cam.
Excellent explanation. I'll admit, I had to listen a few times to fully digest the information. I do have one question, would placing a vehicle with a bump steer condition due to something bent (from a pot hole) on an alignment machine show where the bent component is? Simply, will the alignment machine show the cause of the bump steer?
An alignment machine can show SAI. Or steering axis inclination, which can indicate a bent strut or steering knuckle, when the measured angle is shown to be out of spec. It also can measure included angle, which is SAI including a camber measurement. Generally you use the measurements and visual inspection to determine bent steering and suspension components.
Thank you very much! Please come again!
always support you bro ! keep moving
Thank you bro !
impresive presentation of comlex problem in simply way.. You realy know something .-)
Thanks a lot 😊
A company car I drove years ago, a Nissan Dualis had shocking bump steer and since I live in Australia the freeways are quite undulated and it was difficult to keep in my lane sometimes when going over bumps. It also had the opposite to bottoming out on the bump stops, not sure on what term should be used but when coming out of a bump or dip or even dropping off a speed hump the struts would fully extent and run out of travel and make a big clunk, as if the height of the SUV was not accounted for when selecting for shocker length when they designed the car. My best guess is perhaps they used the front end out of previous sedan model or something and not redesigned it to suit SUV ride height and just made it fit.
Thanks for great and clear info.
Good video, very clear and well presented 😊
Thank you
Great job on the video, very well explained
Thank you 😊
Hey your videos are pretty good and on the point, keep it up.
Can you refer any books for vehicle dynamics?
Thanks ! You can prefer bible of Vehicle dynamics milliken and milliken !
autodata do a book with all these angles
Please explain bump steer unit & acceptable range
thanks for making such a wonderfull video.
Thank you.
Thanks. If there is not the option to have the correct length tie rods can bump steer be tuned out or minimized?
Great explanation of bump steer!
Thanks 👍
Very informative 😊 thanks
Thank you !
Thank you!
could a sway bar end link being too long cause bumpsteer?
now I just need to include some trigonometry into this
Thank u very much! Please come again!
Perfect 👍
Thank you.
Thanks man
You're welcome!
greatttt videooo
If my steering arm extends more than the imaginary line of the upright, should i extend the same distance from the other imaginary line?
Ok so I definitely have an issue
When my truck is up on jack the front toes
But when I set it back down it goes to 0 toe
I took a look at the tie rod angle and it’s a little off from the lower control arm
I guess this makes sense on why the truck darts across the freeway on bumps
Is the the rack tie rods suppose to always be parallel with the lower control arm on a early Mustang II? Have radical bumpsteer.
at 2.05 i think you mean camber angle on the side of your tyre not castor.
Bro can I communicate u personal...I am working in design of all terrain vehicle....I have many doubts can u help me!
Yes, sure ! Mail your queries :- vatsal.jain51@gmail.com
thumbs UP
Toyota: what the hell is bump steer 😂
Great video but very hard to understand your voice
What a confusing and unexciting thing to watch.