Pashley26 Posted January 25, 2013 Report Share Posted January 25, 2013 (edited) There was a whole bunch of fail in the early build though, lots of engine and fabrication issues which were glaringly obvious. There was a build thread for this on Drift Works but it was deleted by the owner because of all the arguing and the blokes attitude. I don't think it has even been driven yet? It certainly hadn't last time I looked. Whilst I appreciate the workmanship I think the car itself is pointless and I really don't like it. Edited January 25, 2013 by Pashley26 Quote Link to comment Share on other sites More sharing options...
Simon Posted January 25, 2013 Report Share Posted January 25, 2013 Nah, he's been building it for like 2-3 years though, he even says he's re-done a lot of it to be fair. I guess taking that long you learn what you did wrong, while still doing it ha. Meh, for someone who's built it in his shed, that he also built, i think it's pretty spectacular. There's no real point to anything anyone does to their cars, like i want to build an airbag trailer - why? why the hell not. Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 25, 2013 Report Share Posted January 25, 2013 Diffusers proven to make lock to lock much quicker. Some guy tried with, and without, and the different is noticeable even from watching, he's on other lock while other guy is just coming out of other lock. That makes no sense at all. Edit: but then I have just googled 'rear diffuser drift car' and found some very bad science on aerodynamics so there you go. Quote Link to comment Share on other sites More sharing options...
george_seamons Posted January 25, 2013 Report Share Posted January 25, 2013 More rear downforce means the front end is effectively lighter, so the wheels can turn easier (I guess?!) Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 25, 2013 Report Share Posted January 25, 2013 But diffusers don't generate downforce at the rear, they allow the floor to work harder so the force will be effectively exerted between the axles somewhere, increasing both front and rear downforce. Quote Link to comment Share on other sites More sharing options...
Greetings Posted January 25, 2013 Report Share Posted January 25, 2013 Do those work by creating a lower pressure at the diffuser, effectively sucking out air from under the car? Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 25, 2013 Report Share Posted January 25, 2013 Not really. In motorsport terms (i.e. F1) basically you have high speed, low pressure air under the car acting on the floor (creating downforce) and the diffuser's job is to return that air to atmospheric pressure as efficiently as possible. The diffuser itself is basically a pressure recovery device. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 25, 2013 Report Share Posted January 25, 2013 Is it true that they also clean up the airflow off the back of the car, thus reducing turbulence and therefore drag? And in a lot of 'normal' cars can help to remove the void that's made by the rear bumper and reducing 'parachute' effect? Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 25, 2013 Report Share Posted January 25, 2013 In theory yes. Because of the ramp you can effectively reduce the size of the wake of the car and so reduce drag. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 25, 2013 Report Share Posted January 25, 2013 Sweet, cheers. I am guessing by the 'in theory' bit, you mean that you have to do it right or it can have the opposite effect Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 25, 2013 Report Share Posted January 25, 2013 Basically provided the floor upstream of the ramp is reasonably smooth and the transition to the ramp doesn't make the flow separate then it should help reduce drag while increasing downforce. If it's done wrong then I think the worst that could happen is that it won't be able to do anything but it probably wouldn't make things worse. Quote Link to comment Share on other sites More sharing options...
Pashley26 Posted January 25, 2013 Report Share Posted January 25, 2013 Cannot wait for Robin to comment. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 25, 2013 Report Share Posted January 25, 2013 Because you think Dave is wrong? I'm fairly sure he could 'out aerodynamics' anyone on this forum... 4 Quote Link to comment Share on other sites More sharing options...
Skoze Posted January 25, 2013 Report Share Posted January 25, 2013 In non-calling-someone-out-on-something-they-really-know-their-shit-on news, my mate's just left his job as feature editor of Land Rover Monthly and clearly has too much time on his hands. Read this if you want some funny fictional stuff about shit old cars; http://issuu.com/brownmag/docs/brownmag_issue_one http://www.facebook.com/BrownMEngineering http://www.facebook.com/Brownmag Quote Link to comment Share on other sites More sharing options...
RobinJI Posted January 25, 2013 Report Share Posted January 25, 2013 (edited) Yeah, I can't argue with any of that, I don't know a huge amount about aero, but what I do tends to agree with what Daves saying. The only thing I would say is that in terms of most tin-tops where the diffuser's lengths quite limited, (and/or the rear overhang's long) the centre of pressure caused by the diffuser can often be around or only just forward of the rear axle, so although they'll help front downforce, it is mostly a rear-biased force. They certainly shouldn't make the front lighter though, unless you've done something very wrong. (Edit, I know Dave wasn't saying otherwise, just thought it could be interpreted that way.) The diffuser on that truck did make me think it was an 'all show no go' affair from the first picture, it certainly goes against what I've been told. Still, I think calling it faux is a bit harsh, I've seen a lot worse, and I expect it still does something, ok a fraction of what a well designed one would do, but I guess it's probably better than nothing. Out of interest, what's makes Dave an aero expert? Not questioning it at all, just being nosey haha. Edited January 25, 2013 by RobinJI Quote Link to comment Share on other sites More sharing options...
greg1040 Posted January 25, 2013 Report Share Posted January 25, 2013 New goodies arrived today Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 25, 2013 Report Share Posted January 25, 2013 Out of interest, what's makes Dave an aero expert?http://www.southampton.ac.uk/engineering/about/staff/dwm101.page 1 Quote Link to comment Share on other sites More sharing options...
RobinJI Posted January 25, 2013 Report Share Posted January 25, 2013 Cool, must be an interesting thing to do. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 25, 2013 Report Share Posted January 25, 2013 Sorry, thought that would be easier than me typing it out Quote Link to comment Share on other sites More sharing options...
Pashley26 Posted January 25, 2013 Report Share Posted January 25, 2013 (edited) Because you think Dave is wrong? I'm fairly sure he could 'out aerodynamics' anyone on this forum... Love all the likes from cretins who missed my point. Especially Matt. The reason why I couldn't wait for Robin to reply was because FINALLY somebody has thoroughly and accurately answered a difficult technical question without Robin having to take time out to do the question justice. Edited January 25, 2013 by Pashley26 Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 25, 2013 Report Share Posted January 25, 2013 Right. That was a pretty tenuous link I must say! 1 Quote Link to comment Share on other sites More sharing options...
RobinJI Posted January 25, 2013 Report Share Posted January 25, 2013 So you wanted me to reply because I didn't need to reply haha. Plenty of questions get answered well in here without me though, there's lots of other equally knowledgeable people on here. 1 Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 25, 2013 Report Share Posted January 25, 2013 Still, I think calling it faux is a bit harsh, I've seen a lot worse, and I expect it still does something, ok a fraction of what a well designed one would do, but I guess it's probably better than nothing. Out of interest, what's makes Dave an aero expert? Not questioning it at all, just being nosey haha. I wasn't so much saying it was faux/bad rather that it's supposedly a drift ute yet they've added a diffuser to potentially produce downforce (and therefore increase grip and stability) when my instinct tells me that a drift car wants to be inherently unstable with as little grip as possible (within reason). Edit: happy for someone to point out why a bit of downforce/reduced lift might be good for a drift car but doesn't seem to tally with how I see drifting! Cheers Ad... that page (and photo!) leaves a lot to be desired! But yeah Aero Engineering degree followed by a doctorate in rally car aerodynamics and now manage and consult for the University wind tunnels . Quote Link to comment Share on other sites More sharing options...
N.Wood Posted January 25, 2013 Report Share Posted January 25, 2013 This place bottles my mind sometimes. Quote Link to comment Share on other sites More sharing options...
Pete.M Posted January 25, 2013 Report Share Posted January 25, 2013 followed by a doctorate in rally car aerodynamics Fancy sending me your thesis? Ha My sh*tty Uni only has a little tunnel that one of the lecturers made. Why I'm still bothering with this Uni I've no idea! Car news: May have accidentally ordered some Bilstein dampers for the brick, and maybe possibly also some lowering springs. oops. Also, two people said they were coming to look at the Focus, neither showed up. Quote Link to comment Share on other sites More sharing options...
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