Hi Ross, sorry I let this reply slip.rossnzwpi wrote:Hi Tim, I've joined the forum to follow your open source project. Have you continued to develop it?
Ross (in NZ)
Agree. You must choose 2.4 or 2.0 type R engine or something like that. Because for example 2.4 Lt engine also near to 200 Hp but more Light weight. I think this engine will give you better performance because of weight advantage.spacer wrote:Big as in displacement/power or big as in reliable yet racing-pedigree v6?
You could take a look into the Honda K-series 2.4L unit. Recent engine, lots of potential and very easy to get to about 300BHP. But most important, probably lighter and easier to package. But then again, I don't know how much money the alfa unit will set you back...
Love these kind of things btw, been doing something similar in solidworks for myself. What cad system are you using?
This would be interesting - I work with a couple of driving simulators and have been meaning to setup a model but I've had such little time available in the last year. I'm particularly interested in seeing if I can come up with a way to manage the transient instabilities which are inherent in vehicles with so much rear weight bias. Then I've got a shopping list of things I want to investigate from roll centres to ackermann. I've actually written a parametric K&C curve generator and want to use it to do some subjective driveability studies in the simulator.garyjpaterson wrote: ↑Thu Jun 01, 2017 4:31 pmAnd if I was able to come up with something worthwhile, I'd also be keen to implement it into a driving simulator as a bit of fun, complete with accurately represented physics (though the interconnected suspension is beyond consumer driving sims...). Would be cool to see it in motion virtually anyway
Nothing special, probably nothing compared to what you're used to - Just Assetto Corsa. I use rF2 aswell but I don't have any experience creating anything with it. In AC its very simple, the only problems I usually have is just due to the lack of real data, which obviously isn't a problem in your case.Tim.Wright wrote: ↑Thu Jun 01, 2017 5:42 pmThis would be interesting - I work with a couple of driving simulators and have been meaning to setup a model but I've had such little time available in the last year. I'm particularly interested in seeing if I can come up with a way to manage the transient instabilities which are inherent in vehicles with so much rear weight bias. Then I've got a shopping list of things I want to investigate from roll centres to ackermann. I've actually written a parametric K&C curve generator and want to use it to do some subjective driveability studies in the simulator.
What kind of simulator do you use? What vehicle model is behind it?
Honestly I've done very little work on the whole project in the last 1-2 years due to work commitments. I'm hoping to pick it up again during this year - perhaps after summer if work slows down a bit.
I think I changed something drastically in the frame around 6 months ago so I don't think the line drawings are accurate. I will see if I can make something more updated. Someone at work made a shooting brake concept and it looks awesome so I'm quite set on that idea. Should give me storage space for beer in the back which you otherwise wouldn't have for a coupè.
Hello,Tim.Wright wrote: ↑Mon Apr 06, 2015 2:07 pmhttps://lh6.googleusercontent.com/-azjd ... _model.png
No real progress recently. I'm without access to CAD and MBS software at the moment which restricts the ability to do things properly.
Angles on the driveshafts are at their max that I'm comfortable with. A lot of their angle is eaten up already in the static alignment because I'm trying to keep the drivetrain as low as possible and the wheels as far back as possible.AngusF1 wrote: ↑Sat Nov 03, 2018 1:53 amSome thoughts on the weight distribution:
This is caused by two factors. One, your transverse engine is practically between the rear wheels, and two, the seat positions are very far rearward - this is enabled by the transverse mounted engine and lack of large fuel tank. Why not either increase the car width, allowing you to push the driver forward so the pedal box is in between the front wheels, or increase the wheelbase by lengthening the passenger compartment and moving the seats forward by the same amount? I know normally increasing the wheelbase forward would send the distribution rearwards, but if you move the pilot along with it the net effect could be more frontwards. A third option could be to move the rear wheels further back, but I guess you're stuck because then you'd have to move the engine backwards, too. How much angle could you put on the driveshafts? If they can endure some angle, you could move the rear wheels back as much as possible. I think some combination of all the above would solve your problem.
That's seems reasonable but I've developed another theory over the years. More rearward weight distribution causes bigger delays between steering input and LatAcc/Yawrate response. When you have a rear-heavy vehicle, fitting larger front tyres it helps reduce these delays so that they will remain under the driver's perception thrshold of a "slow" handling response. Of course this comes at the cost of reduced understeer/stability.AngusF1 wrote: ↑Sat Nov 03, 2018 1:53 amSome thoughts on front tyre width:
You remark that front tyres of rear-engined sports cars are proportionally larger than an allocation purely based on weight distribution would suggest. Yes, I've noticed the same thing. I think the reason is that allocating purely by weight distribution % assumes that a weight of zero implies zero tyre width (ie, the minimum tyre size is zero). In reality, for anything approaching a normal car there is a minimum tyre width of something between 100 to 150mm.
Thanks youTim.Wright wrote: ↑Sun Nov 03, 2019 6:32 pmI've put the engine model (with original FWD gearbox) in STP format here:
https://1drv.ms/u/s!AioEiFs0jfZSgWqTBy_ ... v?e=xacYy1
The alternator and AC compressor are not in the production locations but they are the production parts as I measured them.