Dig (squat) or Separate with Slicks - 4 Link Bar angles - Roadkill nights big tire street example
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- เผยแพร่เมื่อ 25 ก.พ. 2023
- Dig or Separate with Slicks - 4 Link Bar angles - Let's break down some key fundamentals of the 4 Link drag racing rear suspension. Rear squat, dig, or rear anti squat?? How does the bottom bar angle impact suspension squat or separation?
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Now for the 69 barracuda, if we took it to a prepped track, I would raise the ride height just a tad, then bring the top bar down 1 hole on the chassis and test it. I would actually test it just like it is with the single adjustable strange engineering shocks to get a base line, then I would shorten the instant center a tad... Hope this helps!! Go fast, go straight! Be SAFE!
thanks i have 30 in radials changing to slicks 28 -29 but i feel like these 4.56 gear to much for 1150 rear weight
also i think like you said the plates are in wrong for this set up great videos👍
This is like going to school, but learning something that I care about!
I have Modern IRS multi link and double wishbone cars and I learn so much from you. I still apply what I learn best I can. Thanks !
Looking great, Kevin! Great video, as always!
Another great video, I had our race car up on tire blocks measuring all the link bars. Now I got plots of every position and can sort them any way I want. I.e. %rise/squat, ic length, etc
Thanks for the video! I've learned a ton! I made big improvements last year on just 2 trips to the track and looking forward to more this year. also congrats on the weight loss, I lost a 30lbs last year too and feel 100x better!
This is great info for me! Thank you for doing these videos.
Awesome info Kevin. These videos are a lifesaver tremendous help I'm on my first build and it's all new to me. Thank you
As always great information. Thanks again.
Appreciate your input and willingness to post on these subjects. I will be testing my 4 cylinder fox body soon on 10” slicks. I set the engine forward and still have 51% rear bias. I’m going to try to get to slight AS separation. Once I get it close I’ll tag you on FB thanks again
another great lesson Thank you so much.
Definitly one of yur best vidios .
Helping me understand what to do with my gasser drag car .
750hp stick .small tire .nose high gasser .leaf spring ladder bar .
Im always crushing the slick .then unloading the tire ...
It was really hard .to know where to locate the front mount on the ladder bar since Im so nose andfront end high .
From what Im understanding .I need to lower that front mount a couple holes ...and calm this thing down .
You vids are awsome
Wow! That really made a difference on the Barracuda. He almost stalled it! LOL! That was awesome!
Thank you. Good stuff!
Thanks, that was good information.
WOW! Great video Kev. I just subscribed.
Thanks for the sub! Go fast, go straight! Be SAFE!
Your looking good buddy. Great video great info. Thanks
Makes good sense. thanks
Well done
Awesome video, love to see info like this on a leaf spring car
Checkout my leaf spring playlist at th-cam.com/play/PLK2JQ7QIgx_IM33p0dYnW24ic27RShWgA.html
Great info
Good luck with your weight lose, good to see your car on the track.... But love these tech videos the most ...
I would emphasize a point Kevin made... DO NOT get caught up in numbers! They are "guidelines" as a starting point, but in the end you have to give the car what it wants. Understanding how a 4 link works is a must before making changes. Take lots of notes, "I did this, and the car did that" to use for reference.
I absolutely agree. The numbers Kevin gives are a good guideline to go by but you can’t ever bank on those numbers being the only absolute truth that every car has to meet. Each car is different and will react different to various changes. Understanding the fundamentals of 4-link, ladder bar, and leaf spring setups and the physics and forces that are being applied will go a long way toward a great hooking drag car regardless of surface. It can be tweaked and fine tuned from there but a good baseline must be established. My dad and I are learning how to do all that Kevin is teaching with our own car. It’s only a mid 10 second 1/4 mile car but after tuning all the suspension up, we can 60ft side by side with cars 2 seconds quicker than us
Another Father and Son getting it done! Go fast, go straight! Be SAFE!
100 percent!!!! The car will tell you what it wants. 👍👍👍👍
I have been watching some videos showing local tracks typical weekend racing from the 60s and 70s. It was amazing how much the cars were separating the chassis. It’s like the whole car jumped straight up to the limit of suspension travel and then started moving forward. It seems like a lot of wasted motion and time but maybe this was what was required for the track prep and tires of the day.
Yes... technology has changed a bunch for sure! Go fast, go straight! Be SAFE!
ill try it on my s10
Could you do a video on tire pressure and rear tire wrinkle.. how much and how long should it wrinkle
Dam I need you..genius..
Kevin, where does rear shock rebound setting come into play when setting the car up below the A/S line? What does it affect when you tighter or looser, when trying to bring more traction into play?
Question every one says separate with drag radials ie Mickey Thompson but what about Hoosier drag radials? They are way softer sidewall than a Mickey I run 275/60 Hoosiers and the sidewall is literally paper thin wrinkle wall
Thanks for the valuable information. What about tyre pressure? Is it involved? Weather for example if it’s cold or hot do I need to change tyre pressure. I will be much appreciated if you talk about tyre pressure. Thanks 🙏
I need to do a video focused on tire pressure. I will get that on the list. Go fast, go straight! Be SAFE!
Question....My car goes straight and handles great unless I get into a fast wheel spin near the end of the track where it will kick quickly to the right every time. Would adjustments to get more weight on the right tires improve this I am thinking? Thanks in advance!
All these angles are relevant to bar length and such…? So what makes 10degree top bar angle a sweet spot. Wouldn’t that depend on bar length/ride height/chassis rake?
I will add, besides the bar setups, the same approach goes for shock settings. You hear guys say I'm 4 clicks on Compression & 6 clicks on Extension with XYZ shocks. That means absolutely nothing. Who valved the shocks, what's their chassis & 4 link setup doing, on & on. AND don't forget, your front struts/shocks have a big time affect how the 4 link setup works as well.
How about a video on solid mounted rearend like an altered?
I actually own a solid mount altered dragster and still have it. My channel has some videos of that fun ride for you to check out!! I will add that video to the list for sure! Go fast, go straight! Be SAFE!
Stop counting calories. I was obese. Tried counting calories. I went ketogenic and now it is a life style. I’m now at 155. Check out Dr. Ken Berry on TH-cam. Keep the suspension vids coming👍🏻
Thanks Johnny M! I enjoy the calorie counting as I am all about the details so it keeps me accountable. More suspension vids coming for sure. Stay tuned
Go fast, go straight! Be SAFE!
👍👍 on a ladder bar rear coil over is extension typically softer than compression by 4 clicks or so?
That depends on so many things... generally on a ladder bar car I have the extension a good bit tighter than compression at a very high level.... Go fast, go straight! Be SAFE!
You ever tune a 4 link suspension on a roadster/altered with a torsion bar front end? Sure wish I had a way to slow down the weight transfer.
Shoot me some pics of your front suspension at samsalignmentsc@gmail.com
Go fast, go straight! Be SAFE!
Got any advice? I have a fiberglass 1997 Camaro that has a tube chassis it weighs 2424lbs with me (a 125lb stick) it’s a 17” wide tire bracket car and it doesn’t separate the rear end from the body enough so it spins right away then hooks, sometimes it spins hooks then spins or hooks and doesn’t spin or just spin hooks and doesn’t spin after, I need it to plant the tires faster and keep them planted but I’m changing the converter too because it is too tight
I would need a ton more info to even begin to give advice. I encourage you to look at my services on my website at www.samsonperformance.com/store/p1/RemoteSuspensionTuning.html
Go fast, go straight! Be SAFE!
Would the bottom angle on a caltrac bar on leaf spring be a similar set up .
Checkout my video to go deeper on that one: th-cam.com/video/WcA5xQGWpuY/w-d-xo.html
Go fast, go straight! Be SAFE!
I haven't been able to find the procedure for finding the height of the center of gravity.
My bad. I have added it to the description, but the link is: brakepower.com/center-of-gravity-calculator.htm
Go fast, go straight! Be SAFE!
@Kevin Wilson thanks!!
From ur experience. Where would u set up a stock style suspension foxbody on a 28” slick anti squat and IC Wise?
Stock location top bar. Powerglide and 1000hp on no prep
I wish it were that easy for me to answer. Sorry, but too many unknowns for me on your combination. Go fast, go straight! Be SAFE!
4 link
how much does this apply to a foxbody stock style suspension
It applies for sure. Go fast, go straight! Be SAFE!
How to I get ahold of you when my topsportman car is ready for the track?
www.samsonperformance.com/store/p1/RemoteSuspensionTuning.html Go fast, go straight! Be Safe!
www.samsonperformance.com/store/p1/RemoteSuspensionTuning.html Go fast, go straight! Be Safe!
Thanks I saw that after reading your description. Enjoying all your videos this morning. I bought a new build topsportman car from hamsted NC. Chromoly double frame rail. Should be here in Chicago next week. I’ll be contacting you this summer or maybe sooner to look the car over by video. And for help getting it set up. Thanks
Hey Kevin would the theory covered in this video also apply to a fbody torque arm suspension? I have an adjustable short chassis mounted torque arm, lcas & relocation, and cheap cheap competition engineering rear shocks on a 26 slick. Thanks!
Checkout my F-Body video: th-cam.com/video/vpMoOEG7WcA/w-d-xo.html
Go fast, go straight! Be SAFE!
Where are you located kev
Charleston, SC
I can’t believe you didn’t draw that to scale. What a sham!
I know man... sorry...🤣 🤦♂️ Go fast, go straight! Be SAFE!
@@KevinWilsonSBC what computer program is that you’re using on screen? I’d like to get that
@@DNRAuto Percormance Trends Plus 4 link. www.performancetrends.com/4link.htm
My big tire ladder bar bracket car works much better with a slightly uphill angle. The car separates a little with almost full loose rebound on the rear shocks. My 3 inch travel front shocks are full loose on rebound. With 12 pounds of air the tires don’t seem to crush the sidewalls all that much. Car just plain works. 900 hp BBC PG run 9 flat at 154 ish mph.
This is a great example of the entire combination working together. Each car is unique and you have found what your car likes!! Nice work! Go fast, go straight! Be SAFE!
That sounds like a lot of air pressure I'm used to running 6 or 7 psi maybe I need to air mine up to see what the outcome would be, I'm 2270 with driver and run 5.66 /496 easy on the motor at 6600 rpms, Thanks