Kozy
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Everything posted by Kozy
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Page views shot up from about 50/day to nearly 500/day. Very pleased! Just got to keep them coming back now.
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http://www.pistonheads.com/gassing/topic.asp?h=0&f=23&t=1340224&mid=59071&nmt=For+the+%26apos%3Bnatural+aspirators%26apos%3B+-+How+tuned+is+your+engine%3F
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This particular piece is relatively straightfoward, there's not much need to water it down at all really. People on Pistonheads seem to like it, got lots of people comparing their engines now, interesting to see the highest and lowest values coming in, and how some supposedly very good production engines actually appear to be very middle ground.
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Yep 100% my own work, never seen that concept anywhere else.
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Another article, this one based on the performance limitations of naturally aspirated four stroke engines, and calculating your engine's PI number which is a simple as bore, number of cylinders and power, and is comparable across pretty much any NASP 4 stroke piston engine. http://blackartdynamics.com/EngineLimits/Index.php
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Thanks for the kind words Tony. Really I am only just scratching the surface of this subject myself. The amount I do not know is simply staggering, but I will be using the website to log my learning process and maybe tag a few people along in the process. I've just been having a look at something by someone with a good 20 years experience on me: http://www.dynatune-xl.com/uploads/1/2/6/7/12673370/dynatune_7.0.pdf Just... wow. I can't even begin to comprehend the amount of science involved there!
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Yes that makes sense, something I'll have to make do with I guess. I'll try and make it as accessible as possible but it's never going to be simple. The website is predominantly about the maths involved with vehicle dynamics so if people have an aversion to numbers and algebra then it's going to be a bit of a turn off!
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Hmmm, you may have a point there, I've certainly got a very particular way of approaching this sort of thing. Any suggestions on how it could be improved for the non engineering types?
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First of many articles where I attempt to mash some words together into some sort of explanatory article, to help make sense of the horrid abuse of numbers I have created! This one starts off the chassis articles, I posted this one on this forum a while back but it's been updated with interactive calculations, http://blackartdynamics.com/Chassis_Articles/Tyres_and_load_transfer.php
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More site upgrades, more tools added, changed the name and the hosting and er.. that's about it actually. www.blackartdynamics.com
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Here's another one, for brake bias and temperatures. http://blackartracing.zxq.net/Brakes/Index.php Works a bit differently to others that I have seen. The acceleration is a result, not an input, which should more accurately represent reality.
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AP are nothing to do with AP Racing, however I have seen the coilovers being sold in AP Racing boxes so BEWARE. I contacted AP Racing about this and they confirmed they have nothing to do with suspension components. AP are, as far as I can tell, just another Rokkor/Raceland/Jamex/VMaxx rebrand. Cheap s***e IOW.
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New link http://blackartracing.zxq.net/Chassis/LoadTransferDC2.php updated with a faster interface, removing the need to refresh the page each time the user makes a change.
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I guess so. HND Motorsport Engineering and currently studying with the OU towards a BEng. CAD monkey by trade but aiming upwards.
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The MX5 data was published on the Fatcatmotorsports tech pages. Should be pretty accurate, that guy knows his onions. DC2 info was found from various threads on the Honda Tech Autocross forum. These figures probably aren't quite as accurate, but should still be pretty close. The front ARB is mostly a guess on that one as it's a horrid shape. If anyone has better info, or has enough data to warrant creating a page for another car then I'm happy to update.
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Can't edit the OP. Link updated as I've changed the file structure on the server DC2 http://blackartracing.zxq.net/Chassis/Load%20Transfer%202.php MX5 http://blackartracing.zxq.net/Chassis/Load%20Transfer%20Miata.php
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Yes I'd love to hear what you think of it Tony. It's by no means comprehensive and I would love suggestions on improvements/corrections if you can think of any. Lot's more to come too!
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Thought I'd post this here, for use/discussion/constructive criticism etc. It's a suspension dynamics calculator, which calculates roll angles and load transfers, allowing you to see how changes to the vehicle set up affect them. The 'magic number' is the Front Lateral Load Transfer Distribution (FLLTD) which is the portion of the total load transfer that is taken by the front axle. Since we know that tyre load sensitivity dictates that a load differential across an axle pair results in a reduction in the total lateral tractive force of that axle pair, we can take this number as an indication of a cars tendency to understeer, with a higher percentage meaning more understeer. http://blackartracing.zxq.net/Load%20Transfer%202.php There are DC2 and MX5 versions in the sidebar. It won't work on Internet Explorer, some mobile devices may not render it correctly and if you have an over zealous AV program installed it might accuse it of being a spam site. I assure you it is not, I wrote it myself and all it is is some HTML, PHP and JavaScript.
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We do both tarmac and 'unsealed' events, though it's really the tarmac ones I want to set it up for. ARB might be worth a go, but the body roll is already quite high so I'd be wary of increasing it further. It's got a T1 Torsen AFAIK.
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What numbers do you have for the camber? It's not going on a machine until beginning of next month but when I bought it I was told it had a Flyin' Miata alignment on it, which I believe is -1°/-1.5°. I was hoping to get a little more up front, maybe 1.5 to 1.8° for some extra front end grip and to reduce the wear. The tyres were brand new Uniroyal RainExpert 185/60/14 and after two events there the tread has been totally scrubbed off the shoulder. I was running some odd pressures recommended by the previous owner, about 35psi rear and 25psi front, to get the car nice and loose. I think the low pressure is what is causing the tyre to fold over, however I'm wary of adding more pressure as it tends to increase understeer The rears are certainly wearing more evenly, but still showing signs of accelerated shoulder wear even with high pressures. It's undoubtedly the low front pressure which is causing the fronts to wear faster, but as I said, I'd rather counter it with more camber than more pressure. One can never have enough front end grip!
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Well, that throws my idea right out of the window then, I think it must be maxed out already. Just going to have to live with it I guess.
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I'm looking to add some negative camber onto my MX5 to combat some serious outer edge wear after autotesting. The suspension is completely standard, sitting at 14" rear and 13" front ('94 1.8iS). How much negative camber will the adjusters allow?
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That is understandable, keen to hear your opinion though!
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The basic model might be, but the new SRVs are apparently designed and built by Nitron in the UK and retail at between £1300 and £1500. Not sure they're the same thing at all... Should certainly hope not at that price anyway! Interested in your claim that the basic models are rebranded BCs though. I always suspected they might be, (to be honest most coilover systems in the £700 price bracket are), but the MR rep never gives up much info on that side of things. You know this to be fact?
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Are the BC racing dampers really up to the quality of Koni's FSD piston though? That piston is a patented design is it not? To my knowledge, the only dampers offering the same kind of technology are the Ohlins DFV and the nw MeisterR SRV coilovers.