Dear fellow enthusiasts: his book is cheaper than that dubious carbon fibre lip a company you’ve never heard of sells for your car. It’ll last longer too. Just get it, I know, you’re all “is this just an add, can it be that good, can’t I figure it out from the videos?” Get the book.
@JulianEdgar2 ай бұрын
Thank you!
@prophecyking3448Ай бұрын
I don't know boss, attaching a book to a front bumper doesn't seem like a good idea
@tcarter64622 ай бұрын
I was ready to buy about $1000 worth of chassis braces then you appeared on my feed and stopped me before costly needles mods that at best would have only marginally increased the speed at which the same handling characteristics would have happened with less margin for error and correction. Thank you.
@JulianEdgar2 ай бұрын
You can still buy them, it's just that it is almost certain that money is better spent elsewhere.
@tcarter64622 ай бұрын
@JulianEdgar my first book will be your aero book. My car is fairly well balanced by itself, but tends to power understeer. Lift off brake oversteer and has a considerable amount of lift at higher speeds.
@michaelblacktree2 ай бұрын
I've done some tuft testing with a cheap action camera and some yarn. I made a camera rig from PVC pipe, to film the tufts while I drive. Less than $100 US altogether, and you get video footage to watch and analyze all you want.
@buicksmith12492 ай бұрын
First off. Thank you for this video. It helped me a lot. I have plenty of Dirt and snowy roads. So will be doing that for sure. And will defiantly look at the Magnehelic setup for finding out how to get more air out of the engine bay on my 1971 Buick GS.
@SeanOBryanZZ2 ай бұрын
What's up! Nice too see you here. I deffinetly like the way Julian explains, and provides testable expiraments.
@buicksmith12492 ай бұрын
Loving the book by the way.:)
@nateracing2 ай бұрын
8:00 What units are those in? I'd imagine kPa over Pa given how small Pascals are, but I suppose it depends on the speed?
@JulianEdgar2 ай бұрын
Pascals.
@ixD92 ай бұрын
Would checking throttle position (from the ECU) to maintain a given speed be a good way to track changes in drag? If holding 75 mph takes less throttle then there must be less drag, right?
@JulianEdgar2 ай бұрын
Yes but I find maintaining a fixed throttle opening and measuring changes in speed works better. But needs to be done ultra carefully and with comparisons made in the same session.
@ixD92 ай бұрын
@@JulianEdgar Oh, huh. Interesting. Any theories on why that works better? Seems like maintaining specific throttle would be tougher than specific speed. If it's a streetable car, you could even have cruise control maintain speed extra steadily while logging throttle position over time. Just a shower thought on my part though. I yield to your experience.
@JulianEdgar2 ай бұрын
I imagine because the inertia of the car is such that car speed at a fixed throttle opening gives a smoothed result, whereas to maintain a speed, the throttle is constantly being juggled - especially under cruise control.
@michaelblacktree2 ай бұрын
Cruise control would be a bad choice, because it constantly adjusts throttle position. Your throttle position data would be all over the place. Any differences between one test and another would probably get lost in the noise. The fixed throttle position would be more workable, but would need a long section of straight level road with little traffic.
@ixD92 ай бұрын
@@JulianEdgar Ahhh that does make sense. Basically smoothing the value aerodynamically rather than mathematically like you'd have to with a throttle position plot. Thanks for the info!
@matsudakodo2 ай бұрын
Hey Julian, enjoying your videos. Let's say you're done prototyping and testing some aero mods and want to build them out to look more finished. Would 3D printing be viable?
@JulianEdgar2 ай бұрын
For smaller items, maybe.
@gerardvanwalstijn90772 ай бұрын
Hi Julian, it would be great with a link to the book, preferably as an e-book.
@JulianEdgar2 ай бұрын
No e-book is available. Hard copy - www.amazon.com/Vehicle-Aerodynamics-Modification-Development-alternative/dp/B0C87VYVL8 or Amazon in your country
@gerardvanwalstijn90772 ай бұрын
@@JulianEdgar Please consider publishing as an e-book, I am probably not the only potential buyer that only buys e-books to avoid the unnecessary cleanup of my office/house with piles of paper :)
@andersonchong7625Ай бұрын
And I don’t live in the US, oversea shipping fees would be very expensive
@qkurd91412 ай бұрын
Hey Sir! You have great archive here! Wish I could buy some of your books, yet they're impossible to buy from Iran directly! Even though I am United Nations employee, on and off for 8 years now! Yet, I hope we could benefit of'em very soon!
@JulianEdgar2 ай бұрын
If there's a postage service, you can buy them direct from me. But it will be expensive for freight.
@crispychicken79332 ай бұрын
Sorry, maybe I missed it, but what’s the actual method for measuring drag? Engine load?
@JulianEdgar2 ай бұрын
Constant load, varying speeds.
@crispychicken79332 ай бұрын
Ok, I guess as simple as a block under the throttle on the same road then! Thanks
@JulianEdgar2 ай бұрын
Yeah, but with a few more subtleties in testing technique.
@10weslleynereu2 ай бұрын
Hi Julian! I'm making a front grill to (hopefully) increase air flow on the radiator - would measuring the temperature rasing time difference be accurate enough measurement? (I'm planing on ducting the air all the way out behind the wheels but for right now the duct will end on the radiator). Nice information as aways btw!
@JulianEdgar2 ай бұрын
No. Why measure a secondary effect when you can so easily measure the primary? It will be far faster and, I'd suggest, more accurate to measure pressures.
@10weslleynereu2 ай бұрын
@@JulianEdgar Thanks! Im working on acquiring the necessary hardware for it
@johnkim38582 ай бұрын
Cyclist will get meltdowns at 14:07
@JulianEdgar2 ай бұрын
Yes, people calculating Cd values to three decimal places from coast-downs is one of the absurdities of aero misinformation. (At least, not without a huge number of runs, some very sophisticated modelling of rolling inertias, and use of a yaw based anemometer probe.)
@thedude47952 ай бұрын
Dont they spray some water based color that washes off with water on racing cars some how and watch the pattern it forms after laps?
@JulianEdgar2 ай бұрын
Yes, but I have never had any success in doing it on the road. Also, from the pics I have seen, much harder to accurately interpret than tufting.