Automatics always shift to top gear and bog down.

Um, guys... is it me, or is the automatic transmission just completely broken? I can't get any of the vehicles to go faster than 30-40 mph without switching to a manual transmission, and putting in a more powerful engine just makes it worse.

You see, when I'm going like 30-40 mph, the vehicle just shifts to top gear and stays there. Even when I put the throttle all the way to full, the vehicle just stays in top gear and bogs down.

Has anyone else noticed this problem?

 

Only thing I've noticed is that the gavrils don't like to downshift under power, as a result if you wheelspin them they'll shift up (logically) and then they wont shift down again.

 

that really only starts to happen when you mess with the torque curves and shift points in the engine, as well as gear ratios, clutchtorque settings, etc. best thing is to run the updater (seems like a pretty common answer to any problem you may be having). just a tip.

 

I disagree. With the default curves I've actually had instances with automatic transmissions where I'm losing RPM and MPH, and the transmission won't shift down. The only way to get it to do so is to bury the brakes such that it shifts into neutral and then gently put the throttle back on, to avoid it immediately jumping back up to 3rd/4th again, and bogging right back down.

 

Keyboard will never be a good controller to simulate automated transmission because of its digital nature (0-1 input) which for the tranny translates to power off and permanent kickdown states. I guess you need an analogue controller (pedal unit or at least a joystick) to adequately assess if it shifts right or not.

 

I guess you need to read my post a little bit more closely.

PS: I use an Xbox 360 controller.

 

i've noticed cars don't downshift very often.

 

I don't have any problems, the auto trannies don't downshift unless you ride the brake and the throttle, but I've taken the GM up to 90mph on the track in auto

 

The gavril auto trannies are all very similar and do genuinely downshift at quite a low RPM, its not a bug with the game its a thing in the JBeam which I think needs changing.

Try the moonhawk and covet autos (the actual auto boxes, not manuals in arcade auto, although the manual in the covet is pretty decent too), they work far far better. I had pretty decent results with it downshifting predictably on the ecoboost mod I threw together from the data provided here: http://www.beamng.com/threads/8422-Torque-Curve-and-6SPD-Transmission-for-Ford-3-5-Ecoboost



In short. It doesnt seem to be a game bug. Its a vehicle tuning issue (and one I hope is rectified because the gavrils do bog quite heavily).

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Actually, for a comparison.

Both the ecoboost and D15 i6 max at 6000rpm.
The ecoboost low throttle shift down is 2500, the high throttle shiftdown is 4500. Up at 3000 and 5800 accordingly.
The D15, low throttle shift down is 1500 and the high throttle shift down is 1950.

Ecoboost:

Original gavril:

The ecoboost transmission, no bogging and does perform quite nicely with the stock i6 and v8 engine options in my opinion. It is simply a case of the stock transmission not being very good.

 

I don't have much experience with automatic transmissions in real life cars (since I live in Europe and here it's really rare for people to buy them).

But from what I know and from the little experience I have with automatic transmissions, they will usually use higher gears (low RPM's) if you are pressing the accelerator just a little all the way to about three quarters but, if you floor it, then they will drop a gear or even two, get the RPM's higher, and thus allowing you more acceleration and reaching higher speeds.

This characteristic doesn't seem implemented in-game yet (if ever) so I too notice that some cars don't go faster because they are already at top gear and should be one lower... However, if the devs changed this, you would see cars using stupidly high RPM's when you are just trying to enjoy the ride (which for me, being a person that usually rides with higher gears, would feel strange).

 

it is, look in my quotes above, highShiftUp is the shift up point when you are flooring it, lowShiftUp is the shift up point when you are not flooring it. I dont know when it defines something as being floored or not but it seems to be approximately around 75% throttle, maybe a bit higher.

Again from my post above you will find that for the gavril vehicles the highShiftDown is simply set way too low. If you raise it, it works fine.

 

Oh, that's awesome then!
I didn't saw it because I posted my reply a couple of seconds after you so I didn't noticed that someone had said something new, thank you for the post, now it makes more sense

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Yeah, I notice that cars tend to climb gear way too fast when their wheels are spinning...

Would limiting the automatic transmission to only be able to switch gear once every second or something like that maybe correct it?

It's probably a stupid idea but idk... xD
Just hear me out for a couple of seconds... Imagine, your car is stopped, you floor it, it engages 1st gear, wheels start spinning, the game would climb to 2nd gear as is right now but only a second later is the transmission allowed to change to 2nd gear due to this 'change' this keeps the wheels spinning a little longer, than it changes to 2nd gear after that time is over, wheels keep spinning, the car wants to climb a gear right away but it has to wait a second, meanwhile, wheels catch grip, stop spinning and that prevented the car from climbing to top gear just to spin the wheels and then drop 4 gears again, instead it only change gear once...

My logic probably as some huge flaw but maybe it works... That 'second' could be adjusted from car to car, a car with just 3 gears probably would be better to put like 1 even 2 seconds between shifts, while a fast accelerating, high grip, high torque, 4WD rally car, would have less than half a second between shifts...

Also, I may have just wasted 15 minutes of my time writing crap but who knows... Maybe I'm useful without even knowing xD

 

Oh, yeah, you're right, I've overlooked your mentioning of using an analogue controller. My bad. Still, as for using plain keyboard I guess my theory stands.

 

Okay, so I took a look at the transmission part of the jbeams of the cars, looking to make the "fixes", and I have a question about this.

Code:

        "lowShiftDownRPM":1500,
        "lowShiftUpRPM":2700,
        "highShiftDownRPM":1950,
        "highShiftUpRPM":4900,
        

Are there really only two shift points?

 

there are 4.

ShiftUp, ShiftDown are self explanatory. The low or high prefix indicates low or high throttle. The shiftdown point when at high throttle (seems to be somewhere around 75% throttle or maybe a tad higher) for the transmission you have just shown is 1950, the shiftdown point at low throttle is 1500.

So really you have 4 shift points. Up and down for greater than and less than roughly 75% throttle (75% may be an underestimate).

Good one to experiment with is the covet automatic transmission, hold it at 60mph with low throttle and watch the gears in the corner (should be in 4/4), then fully press the throttle (xbox trigger or steering wheel pedal, sadly always at max throttle on keyboard) and it will drop to 3rd gear. It does this because when you switch to high throttle, the higher shiftdown value is then recognised and will cause the transmission to shift it down a gear and hence put the engine into its power band in a torquier gear.

It just happens to be that the highShiftDown on the gavril engines is too low. Increase it a bit and it will also exhibit kickdown.