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New [Driftable] Car! WIP - Alfa Romeo GTV6 2.5L (1985 trim)
12-26-2007, 02:38 AM
Post: #1
New [Driftable] Car! WIP - Alfa Romeo GTV6 2.5L (1985 trim)
Hey guys,

This is my first car for VDrift, and incidentally also my first car in real life. Don't be disheartened, it is not the first car I have ever modelled, and as I have driven (and drifted) this car myself, I've been very careful to get it right. You should love it.

Car model and data made exclusively for VDrift, I'm happy to release under GPL.

Alfa Romeo GTV6, 2.5L version.

- 170kg V6 (Aluminium block and head)
- 117kW @ 5600rpm
- 219 Nm @ 4200 rpm (I spent ages getting the torque curve right)
- 50/50 weight distribution, 90% inside axles
- Double wishbone front suspension - this means a lot of understeer, so start your corners early
- De Dion rear suspension (semi-indepent triangular suspension cage, auto-levelling suspension). This is not quite correct as the engine does not support linked rear suspension, however is as close as I could possibly get it.

I'll spare you the technical details of how the suspension geometries work, but the overall result is a very driftable car on hard compound tyres (It is a GT car after all - Grand Turismo Veloce 6). There are a couple of caveats (steering in a drift is perhaps a little too intuitive. You'll find out what I mean), however you should be drifting in no time.

Without further ado, Here is the car: Direct link to file stored on googlepages (maybe we can get this in SVN? :mrgreenSmile

As described above, power is a little sparse to be useful as a race car (now. Then it was practically the fastest thing on a race track), so could possibly be considered as a drifing trainer.

Speaking of training drifting, the best technique for a fast approach drift in this car (noting that this didn't really work properly until the inclusion of the bullet physics engine):

!! Turn off 200 degree wheel. It will kill you. !!

Before trying this, get a feel for driving the car without drifting. Initially you will find that you have to steer into the corners very early. The race markers are pretty much useless to you, by the way. You'll find eventually that nosing the car in very early and gradating the throttle from as early as the apex will reward you best. At this point you can start thinking about this.

1. Select an appropriate corner. Most sweeping curves are good, optimum drifting gears are 3rd and 4th at between 100 and 150 kph (60~95 mph).

2. Don't enter the corner faster than you're prepared to come out - but this is not a traffic simulation game, is it?

3. Steer into the corner under acceleration, gentle steering at first, but then sharp.

4. Back off the steering as the nose breaks loose and slacken the throttle (sometimes entirely). This should cause the back end to break loose and the front end to come into line. If you want to wuss out at this point, there's still time to stand on the brakes, but you won't be able to complete the corner properly.

At this point you should be facing the inside of the corner, however in all probably you'll be spinning out into one wall or another. Contrary to what you'd expect from the nose breaking loose so dramatically, it's probably the inside wall. Repeating the first four steps is all you can do at this point. Try until you succeed.

5. Now you're into more familiar territory. Get the throttle back on, as it's now your main controlling force for the direction the car is going. Steer to adjust the direction the car is facing relative to the direction it's going, similar to normal with with the strangeness that counter-steering is not as effective as with most cars, and will quite possibly cause you to spin out. For best results, avoid wheel steering angles greater than 3 degrees.

6. Exiting the drift. This should be fairly straightforward and is where counter-steer is most effective. About halfway between the apex and the exit of the corner, you should be facing 15-30 degrees in from the corner exit. countersteer this angle as excatly as you can (you'll have to do this by guesswork, in the real world it's done by feel and is *much* easier), and floor the throttle. For optimal torque, you want to be in the 3800-5800 rpm range at this point - don't be afraid to change gear if you have to, but you're not likely to have to change up as you'll just barely break peak power doing this at best (you've gone well past the peak of torque and going flat out works surprisingly well for the corner). You should hit the exit facing not quite the right way, having gone in almost a straight line sideways

7a. If exiting the corner at this point, slacken the throttle and steering. You'll know if you've dumped too much throttle as you'll fishtail (if you were facing 30 degrees in, all throttle is just enough, though). Repeat step 6 until straight or you spin out or hit something (You'll get better as time goes on).
Throttle on into the straight. Congratulations, that's your drift.

7b. If you're in a chicane, continue through from step 4, noting that your change of spinning out is about doubled.

When executed properly, you should find that the actual road speed of the car drops by about 15-20% during the drift but is back up to the speed you entered by the end, possibly more. Slow approach drifting (power slides) work as normal. You'll get the fastest times by avoiding fast approach drifting, of course.
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Messages In This Thread
New [Driftable] Car! WIP - Alfa Romeo GTV6 2.5L (1985 trim) - fudje - 12-26-2007 02:38 AM
[] - Kricor - 12-26-2007, 02:59 AM
[] - joevenzon_phpbb2_import3 - 12-26-2007, 03:16 AM
[] - joevenzon_phpbb2_import3 - 06-27-2009, 12:17 AM
[] - fudje - 06-27-2009, 06:56 AM
cars - dannyhut - 09-17-2011, 01:53 AM

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