4 Link Instant Center to Center of Gravity Explained | Street Outlaws Suspension Rant
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- เผยแพร่เมื่อ 7 ก.ค. 2024
- 4 Link Instant Center to Center of Gravity Explained: 4 Link Instant Center Explained and the 4 Link Instant Center to Center of Gravity relationship! Let's breakdown how the instant center's relationship to the anti squat line and the center of gravity influences your drag car's suspension and chassis! This video should help with 4 Link Suspensions and provide what many search for as 4 Link Explained. The Anti Squat line is not just for 4 link drag cars. That same line applies to leaf springs, ladder bars, f body torque arms, and any type of suspension mount points with a solid rear axle. IRS is a different beast so see the link below for IRS rear.
There is a Street Outlaws Suspension rant toward the end of the video. I apologize now if that offends you. I am a fan of the show, but I just had to share my thoughts on what I saw on a recent TH-cam video. Please learn from it and take it to heart.
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0:00 Introduction Set the Stage
2:09 Chalkboard Time
7:56 Big Tire Slick
8:56 Instant Center weight transfer
11:04 Unequal 4 Link Bars
13:44 Common IC Big Tire
14:48 Chassis Balance
16:32 High level IC's
19:03 Perfect World IC
20:40 4 Link Wizard
21:37 Big Tire Bottom Bar
23:18 36 Inch Slicks act as a Shock
24:45 Street Outlaw Suspension Rant
27:42 I need your help PLEASE!!
Understanding (Four Link Suspensions) 4 link suspension principles in relation to the Center of Gravity and the Anti Squat line is critical for drag racing rear suspension tuning. Also adjusting rear suspension for no prep racing! How instant center location impact squat versus separation.
Samson Performance of Sam's Alignment in North Charleston, SC:
Get with us at our shop to let us help you scale your car and do a complete plot of your car as it is today and then we can discuss what changes, if any, we would recommend. We do drag car chassis tuning, chassis setup and ensure the suspension is setup for the best drag racing launches possible! We also offer online remote services from our website here below:
samsonperformance.com/service...
Longacre Scales:
amzn.to/3Frdg8K
Drag Racing Suspension and Instant Center Calculator:
www.baselinesuspensions.com/i...
Real Customer Drag Car Suspension Challenges at our Shop:
• 4 Link Tuning Challeng...
How To Scale a drag car:
• Scaling a Drag Car | M...
4 Link Plotting:
• 4 Link Setup with Slic...
Finding Center of Gravity and Neutral Line:
• Pre-Load | Rear Steer ...
More on 4 Link Bar Angles:
• 4 Link Bar Angles | 4 ...
Understanding Shock Dyno and Valving:
• Shock Dyno Graphs Drag...
• Drag Racing Rear Suspe...
Independent Rear Suspensions IRS:
• Independent Rear Suspe...
4 Link Wizard Software:
www.jerrybickel.com/4-link-wi...
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#suspension #dragracing #kevinwilsonsbc #dragcar #noprep #smalltire #bigtires #chassistuning #4link #streetoutlaws - ยานยนต์และพาหนะ
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Thanks for explaining things in a way that makes sense. When my buddy and I get in a little shop time we now make time for a little Kevin Wilson University schoolin`. Kinda funny how most of us knot head car guys spend most of our money chasing power.....well eventually we all get to the point of "Man that pass put a little pucker in the exit hatch". Thanks again Kevin for passing on some knowledge to try out and most important get the car down track SAFE.
Thanks so much for your comments and supporting my channel! I don't take that for granted. I love the University part... I love sharing this stuff and I still am learning myself. I enjoy reading every comment, and this one is near the top!! Go fast, go straight! Be SAFE!!!
Thanks for the video it was what I needed to hear at this time with trying to get a new combination to work
Great video as always! Always learn from your channel!
Awesome! Thank you! Appreciate you! Go fast, go straight! Be SAFE!!
Love your videos keep up the good work 😁
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
When I had the 1471 on my car I ran 1000-1100 degrees on my EGT’s. They made it so easy to turn the motor.
It was a 565 big chief head with coil on plug and I had the timing locked out at 32° all the way up to four boost at 27 pounds.
Thank-you so much for taking the time to leave a comment and for supporting my channel! This is great info for me. Thank-you, Thank-you, Thank-you!!!! I don't take your views and support for granted. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
@@KevinWilsonSBC no problem my friend! I appreciate all the videos and help with the car. Made the change to small tires in 2021 and still struggling with my 60ft but we did manage to get the W at NPK Denver!
Thanks for the info
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
Lots of big tire high HP guys are now running rear wheels with liners & higher air pressure. The new Hoosier 36" tire seems to be the tire of preference. Not interested in anything related to "street racing" so have no idea what they are doing. Good video as always Kev. Once you learn the basics as far as how 4 link works it makes the chassis tuning adjustments much easier to figure out. Performance Trends 4 Link program actually shows you how IC changes at launch depending upon bar length etc.
On EGT's they are dependent upon the combo of course. A roots mild motor 1100 -1300 range, on a all out screw motor 50# of boost 600 down low & maybe 1100 on top end. (1/4 mile).
A good rule of thumb on a screw is using a flow meter & boost gauge. (boost pressure/gpm) A ratio of approx 2.6 to 3.0 puts it in the ballpark as a general rule. I guess the answer is "depends" 😜 Read the plugs is bottom line. A web site with a lot of good info for blown Alky stuff is Inside Top Alcohol. A big nitrous motor will have EGT's in the high 1600's for a comparison. Cheers
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. I am seeing the big tire trend going more and more to liners. You gave me some great info for sure. Thanks so much, Austin!!!! Especially appreciate the insight on the EGT's!! I will checkout Inside Top Alcohol for sure. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
Excellent video Kevin. One thing to add, the higher the IC the easier it is to transfer the vehicles weight to rear tire, the lower the IC the harder it is to transfer the weight to the rear tire.
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
I'd love to hear more about setup for hard tires and how IC changes throughout suspension travel.
Very good Video
Learned alot today
Thanks so much for watching my videos and supporting the channel! I don't take your views for granted. I have so many videos on my list that I need to get through. I need to get the lighting in the garage fixed for sure. Much more on the way! Go fast, go straight! Be SAFE!!!
It been a while but on blown BBC alky altered we ran 32 deg locked out. 35lbs of boost. This was a 6.50 bracket car. Main tuning was clutch, pill for air. Maybe pull a degree or 2 to adjust power overall.
On NHRA TAFC PSI hemi we were high 20's for timing if I recall (2002-2008). Low gear power management was a degree or 2 in or out for coarse adjustments and fuel in or out (6 shooter) for fine adjustments.
Both were 11-1200 egt but as you stated the plugs will tell you what egts will be. I found egts were most helpful in seeing stage distribution ( nozzle spring checks to adjust), if you had a problem and top end distribution. In that order
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. This is great info!! I bet that altered was a blast. I considered dropping this BlownSBC in my altered but dad talked me out of it. LOL! Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
@@KevinWilsonSBC hey, it's good to see you enthusiastic about this and suspension stuff. I havent been involved for over a decade until recently so I'm excited too. Glad to pass anything that I can recall from back then and look forward to your videos
So the Hemi, was it twin-plug or single-plug Gen III?
The Gen III is known for fast flame front propagation.
Nice
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
Do you have any recommendations on who to watch about road racing on rough surfaces? I don't have enough seat time with different known parameters to really trust my own math.
-- For example when I crest a hill WOT at 72mph and run over a cattle guard that's recessed on the exit side, the rear tends to buck and the front tends to bob. I'm on leaf springs, 470hp, 29" tire, 3900lbs with me in it, 56% front weight, 117" wheelbase, 32" from the axle tube to the front spring bracket, 18" high front bracket, 31" high rear bracket, 28" CG height, I want to go to a triangulated 3-link with a lower anti squat value and a forward I.C. to make the rear suspension squat over that bump.
-- I'm of the thinking if I move the I.C. closer to the center of gravity and run 32" lower links into the stock leaf spring brackets, it'll be easier for the damper to do its job. If I promote this squat situation, then maybe I can at least isolate my front damping choices.
I can tell this guy likes to party talking about 1500hp and dumping it 😆 🤣, great video thanks for sharing knowledge these videos really helped do alot of winning this past summer
LOL... Thanks so much, Speedracer412, for commenting and letting me know the videos have helped!!! Keep winning and Go fast, go straight! Be SAFE!!
So lowering the rear mount of the cal=trac design on a leaf set up is for a hard sidewall tire on a prepped track. And closer to the axle will lift the front for more transfer even with the increased leverage of the the distance it has from the differential?
Thank-you so much for taking the time to leave a comment and for supporting my channel! Generally on the caltracs you add bite to the sidewall by using the lower hole, if more than one, on the rear end, then the upper hole on the front cantilever. Really a parallel bar is a good amount of bite, but if I was on a hard tire and was looking for every bit of help I would get the bar angle going up from the rear towards the front. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
have you ever heard of using a pressure transducer to see whats going on with in-cyl pressure and looking at valve timing with an ocillloscope..... i'v done engine running test for automotive diagnostics....funny thing is i'v never heard it talked about.....i would think that this would be one of the most important things to know....you can see valve timing, and cyl back-pressure....
Wow... I have never thought of that!! Very interesting... for sure. Thanks for taking the time to share and comment. I appreciate you watching the videos, and dropping that one here! Go fast, go straight! Be SAFE!!!
I bet that t-bucket would have been scary as hell with a big block with some real power and tires on it. but a perfect deadly hard tire car with a moderate 400 to 500 hp with low torque like a high rpm 283 to 327 cid. rang power plant
Thank-you so much for taking the time to leave a comment and for supporting my channel! I bet... the little thing runs 6.60's in the 1/8 like it is with a set of Hoosier Quick Time Pros. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
we run a level lower bar and 77 inches out at 112 wheelbase weighing 2985#. It runs .980 60' on a 34.5x17 hoosier. the farther you go out the tamer the hit is so we can run more power early and not crush the tire. big power changes things. On egt we run methanol procharger at 43# egt runs 11-1200 but each cylinder is different on what the plug shows. probe end goes in center of tube.
Thank-you so much for sharing all of this!!!! A ,980 60' makes you an authority on your big tire car for sure!!! Also, thank you for watching my videos and sharing about EGT's. To make sure I am following you, I should set the height of the probe so that the tip is in the center of tube, right? Go fast, go straight! Be SAFE!!
@@KevinWilsonSBC yes tip in center of tube. Mine read almost 150 different between all 8 cylinders if you get the spark plugs even. We run efi with coil near plug so we can individually tune fuel and spark
@@btadams123 Thank-you!!!
You're going about the EGT thing incorrectly. EGT is nothing more than a reference point to use for balancing the cylinders. Pull your timing back to 20 degrees and start sneaking up on it, watching the ground strap. Keep the plug happy, and the motor won't milk the oil nor burn pistons/head gaskets.
As an example, I ran a 568 BBC with a 14-71. At 30% OD, it made 32 PSI. Egts were 1250-1300. At 1320 is would tulip the intake valves. But again, that was MY motor. Where you put the EGTs isn't as important. Anywhere 1-3" from the header flange. Just be consistent on the distance. The EGT is a reference for YOUR motor.
Once you find a good looking plug, record the EGTs, then start using your port nozzles to balance the EGT readings. Then use some good software to know what to change your next main jet to for the weather of the next pass.
And please, for the love of God, flow the entire system. You have no idea how far off those jets/nozzles are until you get them flowed. The stamped numbers are a joke.
Thank-you so much for taking the time to leave a comment and for supporting my channel! Your points make a bunch of sense and I appreciate it. Each motor is unique so keep using the plugs, then determine what that EGT is for my motor and keep an eye on the data logs. I did have Enderle do a full flow of my setup with my pump, square valve, and birdcatcher so I have all of that data. Thank-you so so so much!!! Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
@@KevinWilsonSBC Ditch the square valve and get a K-Valve. You need to be running port nozzles. Don't trust Enderle. Get someone with a good flow bench and have the pump, and every nozzle/jet flowed. You're not screwing around once you're above 20 PSI and you need to know what you're putting in that motor, and that when you make a change, it's the anticipated change.
@@billbirmingham Do you have any recommendations on someone? I will need to find a SBC intake that has port nozzle options. The TBS intake I have today does not and I am still running water with the standard 23 degree heads to keep the center exhaust valves cooled. Sorry for all these questions... feel free to just ignore me.. LOL! Regardless, Go fast, go straight! Be Safe!!
Kevin an you do a video on 3 links ? Like 2005-2014 mustangs run ? Or are the principles the same
Same principles apply. Go fast, go straight! Be SAFE!
Seems like that old truck suspension was awesome after all.
Bobby for the W... lol Cut (jump) that light! roflmao
What is separation
Wife kicked him out. hahaha classic!
It true... LOL... Go fast, go straight! Be SAFE!!
what are the effects of completely parallel bars at 0 Degrees? not information on infinite instant centre. cheers
This is a topic included in my next Q&A video... stay tuned!! Go fast, go straight! Be SAFE!!
What defines the anti-squat or neutral line. Did I miss that detail??
th-cam.com/video/nU4PXWg2Dg8/w-d-xo.html
Go fast, go straight! Be Safe!
Are you saying to run tubes in all cases, including small tire radial?
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. I am definitely saying run tubes in the small tire slicks. I am seeing more and more run them in big tires slicks also. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
@@KevinWilsonSBC bias ply slicks, but not radials?
@@billbirmingham Correct. I don't run tubes in any of my customer's drag radials.
I have a foxbody with -32% anti squat 😢 IC is 100
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Where is the leaf spring version of this?
th-cam.com/video/WcA5xQGWpuY/w-d-xo.html
Lol shame on you for not having a proper mans gave with manly race car s***. She's figuring two race cars ?Get that nonsense out of my house. your probably intrigued about a 74 year old women that watches drag car suspension theory videos . lol .... Love the videos, keep them coming! LOVE THEM!!!
Thank-you so much for taking the time to leave a comment and for supporting my channel! I don't take your views and support for granted. Go fast, go straight! Be SAFE!!
Kevin Wilson
KevinWilsonSBC
The average guy doesn't have access to four corner scales......please talk to the guy in his garage once in awhile
How about how to estimate CG and therefor establish IC
I will cover this more soon, but this is why I always tell everyone including the average guy to video their car on the launch. With just a video you can learn a bunch about your IC and what to do next. Thanks! Go fast, go straight! Be SAFE!!
@@KevinWilsonSBC Thanks, saw your vid on using cam height and anti squat line. Building a 40 Buick Coupe...454, Tremec 5-spd, Ford 9", not a drag car but want it to launch straight. You vids will get me there.
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If your using egts your in trouble. Only thing in that chamber is the plug. Plugs are gospel. all that matter.
Absolutely the plugs are the only measure of truth. EGTs are simply a datalog point once I determine the best plug reading for that cylinder. Go fast, go straight! Be SAFE!
Your way off base on egts. do not make changes on egts
See my response on your other comment. Not sure what EGT statement I made in this video. Regardless, EGTs are simply a datalog point for me to correlate to my plugs. Go fast, go straight! Be SAFE!
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