Bump Steer Explained, Build a Gauge and USE IT!
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- Опубліковано 26 бер 2022
- This episode is all about Bump steer. We show you exactly how to build your own bump steer gauge for the cost of two dial indicators or digital indicators plus some scrap steel. We show you what parts on the car create bump steer and how they interact both on the car and on the white board. And then we show you how to use a gauge to measure and change your bump steer. Bump steer applies to any type four wheel vehicle which uses drag links such as Street Stocks, Factory stocks, Pure Street, Modifieds, Late Models, Drag Cars, etc.
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I honestly believe you missed your calling bc you should have been a PROFESSOR bc you are great at explaining everything to the tee Appreciate your knowledgeable videos
Thank you Junior, I appreciate you watching our videos
Great tips for folks that don’t have deep pockets but want to use their brains and tools to get better. 👍🏼
Glad it was helpful!
Did you take physics in school? You do a tremendous job at explaining concepts! Got a gift. You coulda been a physical science teacher.
Just the school of hard knocks :) Seriously though I really enjoy the engineering side of how devices and concepts work. It's cool to figure this stuff out.
Great info on what bump steer is, and how to adjust it.
I love that You are showing how to do this as cheaply as possible.
I’m quite sure You will be consistently competitive with racers that have out spent You by a factor of two.
With recent price increases that may be a factor of 3 Chuck! LOL
Great job explaining bump steering can’t wait till your on the track
It can be aggravating until you figure out the geometry that is really controlling it. And then, not too bad to wrestle with ;)
I’ve done learned so much from Jason’s videos, and not only did I learn I was able to use a good bit of what I learned on my own car.
Amazing job explaining bump steer, I have been altering the geometry on my 2019 wrx sti, with adding full adjustment for caster/camber/toe I used my string alignment setup to rough in bump steer which I got the arcs really close but it’s not perfect & next step is to do it this way & make a custom spacer after using shims to get it perfect. Will be tracking car on road course & get into time attack so have spent a lot of time getting suspension dialed in with good components. This is last thing I need to do until I swap front LCA to independent caster adjustment arms then start the process over again.
Glad it was helpful 😀
I have long suspension travel on my no prep truck front end that I am installing and this is an awesome awesome explanation of how to eliminate the bump steer that I will create with 9 in of movement. Thank you very much sir.
Glad to hear it sir and thank you for watching!
this is the only video on youtube that made me understand everything about bumpsteer and how to correct it. Thank you!
Really glad to hear that Christian because that's just what I am trying to accomplish. Sure appreciate you watching our channel!
That's why it makes things much easier to buy a car that has it set already, not everyone can get this or wants to fool with that. That is the difference between someone racing for fun and the one that tak s it serious. Love the videos you put out and I will buy one of your Ts if you let me know we're to purchase it. Thank you.
I agree Dana, I bought a car years ago that was total junk but he gave me all kinds of items like raceivers, air gages, camber gauge, etc.
Check out my site www.dirtracelife.com for shirts and also more info I have been adding.
Thanks, this is what I needed for my front end design, two thumbs up
Thank you sir, glad it was helpful
I scribe 1in marks on the plate so you can ditch the tape measure. Next car I have will have an easy way to lock the steering shaft built in, IDK how many times i have screwed up these measurements with the steering moving. nice video.
Well That will be getting done ASAP! Thanks for the tip.
Thank you for all the great information
Thank you Tracey, and thanks for watching too
Wow absolute genius here, best teacher ever.
Kind words sir, Thank you.
Thanks so much for the information. I learned a lot. I gong to use it on my dirt track car. I'm already setting up the diagram. Ha.
Thanks again and good luck on the race track.
Yes sir, thank you for watching
Thank you so much, you are value-adding to this universe.
Thank you sir.
Hey Jason, one thing I noticed when you were running through bump was that the lf horn raised up and went back down when you were raising and lowering the assembly. Just wanted to let you know in case you got any readings that didn’t make sense! I love your design for the homemade bump gauge. Simplicity is king! Can’t wait to see her at the track!
It could have been rocking on my lift. Sounds like I am going to do it again.
@@DIRTRACELIFE you can see it at about 39:15 when you let it back down to extension.
I just saw that and I know you would want me to point it out to you! I suspect it probably won’t change much, but just in case.
@@rollrateguy6109 yes absolutely. Rushing to make that Golden Egg and cutting corners is no good!
@@DIRTRACELIFE you’ll make it!
Great video Jason
Thanks man, appreciate you watching.
Hey Man, yes great explination. Im racin formula ford and what I dont underand is how to make the adjustments if needed as I wouldnt want to change my toe link and have my toe out of wack. thanks and hope to learn more.
Glad it was helpful and thank you for watching!
Hey dirt race life. Someone from road racing life here I love ur videos. I learn a lot here.
Regarding camber: Should I ensure the camber at each side of the car is equal before doing the measurements? For example, if the tire temps dictated 1 degree more camber on the front left than the front right, would I want to reset the front camber angles to be equal before measuring bump? Thanks man!
Going to build a tool like this. I hate my longacre tool
Ok first. . . . Road racing! I'd love to do it but it sure isn't dirt circle so take this as just some outside your field type ideas.
I think you should ALWAYS do bump after setting caster and camber. If you change them significantly then I would re-run bump because it can change a little. As far as temp differences with the same camber on both sides..... Ok that road specific but couldn't that actually lead you in a bad direction because it is simply happening due to the shape and pattern of the course. So if you tune to it at the track, all is good and you get faster but if you take that split setup to a difference course couldn't it just as easily make you slower than you would have been? just some thoughts :)
I have a daily Crosstrek 2015, that has the following:
Lifted 1.25 inch.
Camber is aligned by the whiteline Bolts.
Rallitek springs with Belstien dampers.
Purren Endlinks.
Double offset low arm rear bushings - for caster.
Now, i'm thinking of the Whiteline Front Roll Center Adjuster Bump Steer Correction Kit (KCA313).
Do the lifted cars needs Bump-steer coreection ?
My expertise is in circle track GM based frames however I can answer, YES anytime you significantly change the ride height you will have to make bump steer corrections.
Great video explaining bump steer. Did you notice while compressing the suspension you were slightly moving the chassis as well? As a result of this movement and measuring height from the ground wouldn’t this give you an incorrect bump measurement?
Yes it moved on me and I didn't catch it at the time but the measurements were very close. I learn with every new car and you'll see on the car I built this year we did a much better job measuring ;)
HELP! I have a center R&P from a Cavalier installed in my 1948 Chevy Coupe. If I have the Tie Rod parallel to the lower control arm AND the tie rod length exactly the same as the lower control arm....would you expect my bump steer to be acceptable? This is a street car...no drag racing or circle track. All rest of front suspension is stock...king pins, etc. Any input will be appreciated.
I think you would be very close but the camber and caster curves will have an impact if they are significant. On a street car I would always tell you to consult with an expert specifically working on road legal builds. Remember, everything I am doing is to only turn left hand circles.
@@DIRTRACELIFE. Thanks for sharing your knowledge and encouraging me. Some of my misspent youth was hanging around 1/2 and 1/3 mile dirt and oiled dirt tracks in SE Ohio. Keep on keepin on.
can you you use a castor change to fix bump steer?
It does have an effect but it's not a way to make adjustment. I think if you had huge caster gain or loss in compression then it could be an issue that shows up in bump as well.
Well this is such a great channel. Although I am not a dirt guy, many things still apply. I would very much like to share with some knowledge. I noticed that doing your bump the chassis did move. Sure maybe a minor thing however me being me. Had to point it with a solution.
On my bump jack I found some scrap turnbuckles and put those in place of the shock I have a much smoother and repetitive reading.
But Jason, loving the content, wish I could help with sponsoring but my asphalt car needs my cash lol.
But thank you again for the great content!!
Well this is good timing. I am fixing to run my bump again as part of getting ready for the Street Stock Nationals. Since I have a load stick now I will just use that sucker as my turn buckle same as you. Thanks for the tip and the feedback :)
Awesome, I’m fixing to do mine over after fixin a wreck. I’m much like you and a one man show.
Awesome, I’m fixing to do mine over after fixin a wreck. I’m much like you and a one man show.
Awesome, I’m fixing to do mine over after fixin a wreck. I’m much like you and a one man show.
Awesome, I’m fixing to do mine over after fixin a wreck. I’m much like you and a one man show.
Are those 1/4-20 couplers round or hex?
Those are hex. I used the basic hardware style because they were just right to drive into the tube and the edges bite in very well.
What tie rods are you using?
The inners are the 73-77 GM's which are the same as camaros but straight instead of bent. The swedge tubes are the conversion tubes that are 11/16ths LH on the inner tie rod end and then 5/8ths RH on the outer end and then I am using 5/8ths hiems which are for steering and have a built in grease fitting.
Do you think running a front sway bar in a pure stock class is better or not running it is best
Do u think it's better to run away bar or not to run it in pure stock class we have to run factory strings
Is there anyway to tell what weight rate factory springs are without a spring machine
Junior, I have never run a sway bar on dirt. My thought on this is I want the car to be freed up and able to roll easily without having a sway bar modify the spring rate.
If you have access to a hydraulic press and scales then you can measure rate by putting the scale on the base and the spring on top of it. You may have to rig up a piece of wood or something to make a holder for the spring bottom. Measure one inch of compression on your scale. It won't be very accurate but it will let you know the ball park.
BUT BE CAREFUL! That spring has to be secured with a chain or something because it's a missile if it slips loose.
I agree if a sway bar was used then it would sure make sense to go lighter on springs. I just have no experience so far doing it.
You don't need to eliminate bump steer you need to correct it
I agree, you can't eliminate it because the front end geometry won't allow it, but you can get it close to zero right in the critical movement point and that's all we need ;)
Yeah buddy some ingenuity to get r done!
Ur only gonna spend $300-550 to buy one 🤣
I know it seems super lightweight and simple but I have used it about ten times now and it is holding up great. Sometimes its just not necessary to spend a ton on something.