Five things people get wrong about car suspension

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Five things people get wrong about car suspension

Рет қаралды 4,282

Күн бұрын

When thinking about road handling, all these are wrong: (1) To improve handling, you need to change all the suspension parts. (2) Tyres fix handling. (3) Aftermarket companies sell matched shocks and springs. (4) If you improve handling, the ride gets worse. (5) Suspension is really complicated to understand. www.amazon.com... or Amazon in your country.

Пікірлер: 45

@tiitsaul9036 Ай бұрын

I just received the book. It's a fat one 😮 it will take me a while to go through it. Cheers.

@JulianEdgar Ай бұрын

I hope you like how your pics are used. Thanks again for supplying them.

@peaceonearth8693 Ай бұрын

Please! How was the text or font size? Is it a strain to read it or comfortable and unnoticeable?

@JulianEdgar Ай бұрын

The body text is Arial 10 point with 1.15 spacing. Easy to read.

@dukinse5198 Ай бұрын

I can relate as being wrong at the 5. I always thought suspension is way too hard and complicated

@johnbarker5009 Ай бұрын

Super advice. Address the issue that's causing the problem. You even hear that at the level of professional racing, when you listen to drivers and crews talking about how the car is driving. The crew always wants to know what issue most concerns the driver. Understeer, oversteer, balance that changes dramatically from low speed to high speed, bottoming, unpredictability... The crew always wants to know what has the driver most concerned. We can think the same way about our own cars as we seek to tune the suspension. Not only does none of it require us to make mass changes, but if we do make mass changes we won't know which thing we did that has caused some new problem with the handling.

@JulianEdgar Ай бұрын

Absolutely.

@milesredgate4596 Ай бұрын

I ordered my copy today. If it's even half as informative as your videos it'll be a great read.

@JulianEdgar Ай бұрын

I think you'll find it is many times more informative than my videos - 10 minute videos are a poor medium for conveying ideas in depth. (If you like the book, please leave a detailed review on Amazon. Reviews are one of the few ways a self-published author can promote their books.)

@EvoraGT430 Ай бұрын

Point 3 is SO true. Bought a Bilstein/Eibach (B12) "matched kit" for a previous car. The damping was dangerously soft, with the car floaty or hitting the bump stops!

@MrWilliam.Stewart Ай бұрын

Don't shop online myself, but have made an exception for this book, my book is due on 5th of July 😃 Cheers Jules.

@mceajc Ай бұрын

Does this mean I could get a set of terrible, cheap tyres in order to test the limits of handling at lower - and safer - speeds?

@JulianEdgar Ай бұрын

To an extent, yes. Or test on slippery surfaces - refer to Page 218 of the book.

@avincombat939 Ай бұрын

Great video! I have always avoided diving into suspension up to this point due to how daunting it seems but this really simplified things for me.

@JulianEdgar Ай бұрын

Glad it was helpful!

@ChainsawChuck13 Ай бұрын

As far as tires and handling balance: I have actually heard of some specific cars where this does happen because of suspension behavior that the stock tires simply never allow enough load to expose. Specifically, some coil-sprung live axle setups, perhaps held back by packaging constraints, tend to bind up under load, causing massively increased roll stiffness (and snap oversteer) past a certain point. Supposedly, fitting stickier tires will make this much worse. I assume this is because, by the time the tires do run out of grip, the suspension has already been pushed way past the point where it starts to bind, so the outside rear tire then lets go quite suddenly. I've specifically heard of the fox Mustang and SA22C/FB RX7 having this problem; apparently the RX7 was so bad this way that people racing them on the track would set everything to full stiff (it can't move wrong if it can't move at all), replace the bushings with roll-bar padding to get a little bit of compliance back, then use alignment to tune handling. Doesn't really sound like a fun way to go fast, if I'm honest. Also, when people started racing the first-gen Miata, they apparently found out that upgrading the tires turned it into an oversteer monster, and a sway-bar change was the easiest fix

@JulianEdgar Ай бұрын

It's all very interesting, but actually calculate the grip change caused by changing tyres. Maybe going from crappy street tyres to racing slicks might cause that sort of quantum change in tyre grip levels, but that's a pretty unusual situation.

@Splarkszter Ай бұрын

Woah. This is so informative. Thank you so much for these videos! When i have spare money i'll buy your book but please keep making the videos too :D

@dukinse5198 Ай бұрын

At point number 2, I have heard a lot of tyre journalists comment about tyres making the car understeer or oversteer. Are they lying or what? I mean the same exact car just rotating through makes of tyres.

@JulianEdgar Ай бұрын

They're talking absolutely tiny changes. With setting up suspension, I am talking the ability to make huge changes.

@Mistabushi Ай бұрын

I’ll wait for reviews. My problem with buying these types of books online is that usually just cover general information with maybe some real-world stories, but nothing in-depth and proper technical info.

@JulianEdgar Ай бұрын

The contents page is shown on Amazon - www.amazon.com/Vehicle-Ride-Handling-Modification-Development/dp/B0D7327WSB Click on 'read sample' or scroll right down the page.

@parrotraiser6541 Ай бұрын

Point #5 Some people seek profundity through obscurity.

@jonclark25 Ай бұрын

Is this book also going to be applicable for club level race cars? Or primarily road car based?

@JulianEdgar Ай бұрын

The book is primarily aimed at road cars, however there is a great deal in the book that is applicable to club level racers. The content pages are visible on Amazon when you click on 'read sample'. www.amazon.com/Vehicle-Ride-Handling-Modification-Development/dp/B0D7327WSB

@TheBaldMiddleAgedMetalHead Ай бұрын

Most if not all road cars just understeer too much and a thicker rear roll bar is all most cars will ever need.

@JulianEdgar Ай бұрын

Yes, as covered in kzfaq.info/get/bejne/fquBlad4p87FZoE.html

@herniagaming Ай бұрын

An lsd as standard on fwd cars would be nice as well, probably ironically safer as well

@wopmf4345FxFDxdGaa20 14 күн бұрын

I'm wondering that cannot the manufacturers use computer simulation to do the matching with a vehicle? 🤔

@JulianEdgar 14 күн бұрын

All manufacturers use computer simulations - but all manufacturers also fine-tune the suspension by testing.

@wopmf4345FxFDxdGaa20 13 күн бұрын

@@JulianEdgar Thank you for the answer. I take it that the simulation is not accurate enough or the current state of the art tools are not developed well enough (that the aftermarket set manufacturers use), that you cannot do the process well enough in simulation. Yes, obviously testing is used, but testing especially in the full setup is often also most expensive as you highlighted. To highlight the principle, take an example from the Wright brothers when they were solving the problem of the flying machine, the airplane. Solving also this issue involved massive amount of experimentation and testing for many different areas, which of one was to figure out the optimal wing profile. Initially they tested the wings by flying them like a kite. It was very laborious (expensive) and not very accurate. But then they figured out that instead of making the wing move to test it, they decided to make the air move, so they developed a wind tunnel. This allowed them to test different wing profiles much faster, iterate the design much faster and with much better repeatability. Well, I'm just trying to highlight here the principle about testing and cost of testing, that the purpose of it is just to find out some truth and valuable information. Any shortcut you can come up in obtaining that same information is totally allowed and encouraged.

@johnkim3858 Ай бұрын

Will the content of the book help when designing a suspension from scratch? I am struggling with whether anti-roll bars are worth the integration hurdles. What I am looking for is mainly why car manufacturers choose to have anti-roll bars in their designs despite additional parts. Is it as simple as “to not bottom out the suspension when the car rolls under lateral accelerations?” Also, does the book have equations for determining how much flat-ride spring rates affect dynamic pitch stability from a traction to an NVH standpoint?

@JulianEdgar Ай бұрын

The content of the book will help those designing a suspension from scratch - it's one of the target audiences. Springs of appropriate stiffness don't provide sufficient anti-roll capability on their own. Re flat ride, I've already answered you on that topic - buy the book if you want more.

@johnkim3858 Ай бұрын

@@JulianEdgar You did answer the flat ride question last time; sorry, my bad. Thanks for the clue on anti-roll bars. 👍

@nooooooooooo6uoki67 Ай бұрын

@@JulianEdgar Ah ha, so even if you have overly stiff suspension the car will still tend to unload one side? Interesting, I guess this depends on how much speed you carry through a turn right? Cheers!

@JulianEdgar Ай бұрын

The greater the suspension stiffness *at one end of the car*, the more the inner tyre will unload at that end. Suspension stiffness does not change total weight transfer.

@nooooooooooo6uoki67 Ай бұрын

@@JulianEdgar Very interesting, bought the book and I hope you enjoy your weekend

@peaceonearth8693 Ай бұрын

I've noticed a trend in modern books. Which is, sometimes the size of the text or font is too small to read. Older books never had that cheap-shot built in. I hate to spend money on a book unless I know the publishing house did not pull this sabotage. Your book seems like it would be good.

@JulianEdgar Ай бұрын

The body text is Arial 10 point with 1.15 spacing. Easy to read. Some books go to small text to save in printing costs. I chose not to - one reason the book is expensive!

@peaceonearth8693 Ай бұрын

@@JulianEdgar 👍 👍

@goldar4846 Ай бұрын

I've got an issue with my car that nobody is able to diagnose. The front left likes to lose all grip without warning on right hand turns when driving spiritedly. An alignment has been carried out twice and every component other than the shocks and top mounts have been replaced. Tyres are mps4's. What could be the cause of this? What geometry change would cause it to act like this?

@JulianEdgar Ай бұрын

If the car behaves differently in left-hand versus right-hand corners there is something asymmetric left/right in the suspension. I couldn't comment further than that.

@Brainiac31 Ай бұрын

Does one wheel lock up first when panic braking? Does it pull to the left or right? If either of these are true, it could be your corner weights are off. Find a shop with scales and have it checked.