RuneStorm
http://www.runestorm.com/forums/

[Tuning Log] Really irritating me to tune this car in FM2....
http://www.runestorm.com/forums/viewtopic.php?f=6&t=63863
Page 1 of 1

Author:  OCAdam [ Fri Aug 01, 2008 11:14 am ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

Okay, I'm a bit bored, and I've got a quite decent car set for a racing series in FM2. The series (which I plan to try entering when I get Live up and running) calls for only 4 rules:

1. The car must have a maximum horsepower limit of 400.
2. The car must weigh over 2800 pounds.
3. The car must be Rear-Wheel Drive.
4. The car must not exceed A850 in the Performance Index.

--

Of course, I've got myself a decently fast car tuned up for the rules, a Border tuned Toyota MR2. Stock it weights about 2900, and had 240HP. I got it tuned to 398HP, about 385 ft/lbs of torque, and also weights now... somewhere around 2860. I'll have to re-check, but that's the basic stats of the car.

Tuning-wise, I've been using Sunset Peninsula Infield as my testing track, since it can get the car up to top speed on the speedway section of the course, and has a few high speed chicanes and corners to test handling. Low speed handling is also taken car of with one specific left-hand corner. Brakes get checked on stability from the first major corner in the track, where you go from top speed to 75MPH for the dual-apex 180 degree right hander. Overall the track tests a lot of the car's capabilities. On top of that, it's also one of the tracks they run with in the series.

--

[8/1/08]

Right now, the car loves to oversteer quite a bit after hitting certain rumble strips when it comes back down. Other corners it'll plain understeer. Top speed reached on this track was 167MPH. On the full speedway track (with some gear tuning) it achieved 175, so it gets close to top top speed on the Infield. Some more notes on the car is that the turbo kicks in at about 3500RPM, and the car has a near flat HP curve over 6000RPM. Redline at 7000RPM means it can be using next to max power for quite a while on the speedway.

Maybe I need to do a few more pounds of downforce, but I don't want to lose my top speed on the speedway section... It could potentially be something I could fix by lowering the tire pressures on the front... Well I'm off to do a few more laps tuning.

On a last note: The track outing it had yesterday went quite well. I raced it as a 450HP car (still using 398HP though... I kept in the orig series rules) for 5 laps on the SPI, and it won by quite a distance. With a bit more tuning, I bet it could take on the 500HP series. I'll just have to see after I remove the oversteering tendency of the car... That slows me down more than the understeer... at least the car is easy to control during a drift.

---

Update:

Well I figured the reason I could never stop the oversteer on certain corners... It just happens the car will be producing abit too much power for the tires to handle. The way I fixed my problems were to lay off full throttle until I was slightly more out of the corner. Another solution for one corner only was to shift from 4th to 5th before I even apexed the corner so the car's power wouldn't get jolted while I tapped the rumble strip. Instead of that last one slowing me down, it speeds me up since the car has full grip by the time it gets back into 5th gear.

Final Update: This might be the only place I'll post here. So for anything to say, it's here or nothing.

Author:  OCAdam [ Sat Aug 02, 2008 11:22 am ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

[8/2/08]

Well, I can't seem to get my car to run a sub 1:29.55x lap... I'm aiming for a 1:26 also, so this is REALLY slowing me down... Maybe I need to tune up the anti-roll bars to more drastic settings...?

All I've done is very minimal changes to the original racing anti-roll bars' settings. If this doesn't help the cornering speeds, then I don't know how else to get faster lap times without messing with the downforce (still want the passing speed on the speedway sector). Hmm.... I could potentially change the shock absorbers to be a bit harder/softer depending on how the roll bar tuning goes...

Author:  OCAdam [ Mon Aug 04, 2008 11:23 am ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

[8/4/08]

Well, looks like not many people care to look in here, eh? :P

Anyways, I've finally figured out what I should have been doing to tune out oversteer other than improved technique (although that REALLY helps too!!). Instead of doing more rear toe-out (induces oversteer), I now switched over to add more toe-in to the front tires. This makes the car turn as well as before, but without the side-effect of oversteer.

Obviously, if you think about it, I can't overdo the toe-in/out on the tires ever. Since toe angle of a car's tires refers to the angle the tires are constantly turned at, too much of it will reduce tire life SIGNIFICANTLY. Think of it like this: 2 steering wheels, 1 per wheel. Turn the wheels in opposite directions and drive forward. You'll go straight, but not only is the car unable to accelerate well, you'll probably hear the tires just screeching LOUDLY.

So now I've also figured that the downforce amount I use right now is the optimum amount to keep the car going 165MPH as I cross the start/finish line consistently (other times it goes faster). Even 3lbs more of downforce will cause the car to only go 164 past the line. Seems insignificant for a 1MPH lose, but I don't even gain anything in corner speed with that minimal difference in downforce. Tis useless tuning downforce anymore.

I've slowed down a bit since 2 days ago, but still I run sub 1:30 every lap, even when I screw up (ignoring offcourse penalties obviously). It's now very rare for me to even hit a wall where possible. I'd say only once every... 70 laps. I'm learning the course pretty well! :D

In non-tuning news: I've started to design a Lucario based car design for the MR2. I have to use a Mini Cooper to actually create Lucario himself, since the Mini's roof is large enough to get a good feel of how to get him in proportion to a ref pic I am using. Painting in FM2 is way harder than trying to draw in some ways, but easier in others.... I don't have to do sucky coloring in FM2 (yay for color wheel!!), and erasers aren't needed (but delete function is!). So far: His head's base shape (plus 2 of the... things sticking out the back of his head (his left side)) are done. I'll probably only need to complete the rest of his head's details and maybe part of his upper torso. Hard, but fun! I'll need to figure what else to do with the car once I'm done with actually adding Lucario on it...

Author:  SHAD0Wdump [ Mon Aug 04, 2008 1:31 pm ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

I might have a brother who would understand what your saying perfectly...
As for me,I can only try to use logic.

Author:  OCAdam [ Mon Aug 04, 2008 5:04 pm ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

lol, it's fun trying to figure stuff you don't understand!

As for me, I'll post a course map so you guys can reference what corners I mean if I say a certain turn number.

Image

Anyways, I raced the Border MR2 in it's 2nd race. I finished the car in a close battle for 3rd, even after a nasty spin on lap 5 of 7 coming off 15. I was second, but there was NO way I'd have caught 1st.

The race? 600HP max power. Since my car was tuned for another series, it still had 398HP.

Now for the technical and fun part. Lap 1, turn 1, I rear-end 4th place in my attempt to pass him, and recieve very minor fender damage. Luckily there was no performance decrease.

Next exciting thing, lap 5, turn 15. I'm already oversteering from the exit of turn 14, and I get into a massive drift entering 16. Since I'm not able to control it at 50+ degree angles obviously, I spin it.... At the worst possible place. I try a 360, but only get a horrible 180 (the worst possible thing to happen). Finally get it going again, dropping from 2nd to 4th.

Now, lap 7 (of 7). I'm maybe 3 seconds from the 3rd place Dodge Viper Competition Coupe. I nailed turns 1 through 5. Exiting 5, I'm right on the back bumper of the Viper, so I swing wide, and get a drag race down the 5-6 straight. Side-by-side, slam the brakes, and the Viper hits his too late, and cuts the corner VERY wide. I nail 6 perfect and get an easy 1 second lead on him.

The Ferrari F50 in front of me is just a bit too hard ahead to pass by turn 11, so I just attempt to nail 12 and 13's chicanes for the 13-14 straight. Luckily I do that and the Viper is still a full 1.5 seconds behind me. I get a bit sideways on the exit of 15 (uh-oh) and keep it going. By the time I reach the start/finish line, that Viper is where now? 0.283 seconds behind.

^^ Podium, yeah! THat was a GOOD race though... pure skill for me to run in that one so well.

Author:  ShadowBlade [ Tue Aug 05, 2008 5:04 pm ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

i'm lost..

Author:  SHAD0Wdump [ Tue Aug 05, 2008 5:36 pm ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

Good,I'm not alone.

Author:  OCAdam [ Wed Aug 06, 2008 2:37 pm ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

Well if I had a camcorder... or somthing to record what I'm doing... then you'd understand about 33% more.

Understeer = the car doesn't turn (front tires losing grip simply)

Oversteer = the car is about to spin out (rear tires losing grip simply)

Other than that, just use Wikipedia...

---

[8/6/08]

Today I've gotten worse at driving the car it seems... I tried more fixes to the oversteer, and I was able to find that increasing the rear anti-roll bar stiffness helped a bit. Decreased caster angle some more... increased toe angles (0.3 to 0.4 in front, -0.2 to -0.3 in rear). This all seems to make the car a bit better in the corners.

I haven't done anything to painting more of Lucario on the Mini Cooper though... I probably should, shouldn't I? It'd make for a nice design on the car when I get a chance to record what I'm doing on the game! :D

Author:  OCAdam [ Thu Aug 14, 2008 9:26 am ]
Post subject:  [Tuning Log] Really irritating me to tune this car in FM2....

[8/14/08]

I have not been able to figure anything new to make this car faster whatsoever... I can't get any new tunes setup for the car... However, I DID find that the car really hates bumpy/hilly tracks with this tune-up! It made a great drift car on Suzuka... if I learned control on that course, it'd be running faster corners than some of Forza's RACE CARS. @_@

Page 1 of 1 All times are UTC - 6 hours
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/