Cars have low top speeds and fast acceleration

I've noticed that a lot of cars in BeamNG have acceleration higher and top speed lower than it's supposed to be.

For example, take the Grand Marshal.
I've used it with the sport wheels and a modded engine (310hp@5000, 600nm@3000), and it reached 60 way too fast (5.3-5.5sec), however, it struggled to get past 140 no matter which gear ratios I used, which stuck me as odd.
The Covet also barely reaches 100 with a 150hp engine, which is extremely unrealistic.

Is this supposed to be like this or is it an issue; I read something about the tires' rolling resistance?

Also, some kind of debris starts flying out of any car when going over 100-110, sometimes even under 75, what's up with that?

 

hmmm, i wonder if there's a top-speed value anywhere in the jbeam files

 

Real Ford Crown Victoria Police Package has a top speed of around 140mph, a Caprice 9c1 does like, 155mph. Not that far off.
Did you time the acceleration with the in-game counter? It shouldn't be that fast... should be like 7 and a bit tops...
Real Honda Civic 1.5 only does 110 or so mph, however I doubt you looked at the right hp figure. Should look at the hp curve graph mate, not the wheel or current hp ones.

 

There isn't.
The top speed is defined by the engine's power curve, air drag, gear ratios, transmission loss, tire pressure/rolling resistance and many other factors.

EDIT: I also used the Covet with a modified, 140hp (not 150, but it shouldn't make a big difference), engine.
I'll post the power curve pics in a minute.

 

Engine RPM's. Enough said. It is possible for 2 engines with the same gearing to have the same maximum RPM yet different horsepower. Most of the 3rd party engine mods don't alter the maximum RPM's of the engine nor alter the gearing so once you redline in top gear you will be going the same speed.

 

Well, isn't that kind of obvious?
I understand what affects top speed, and it isn't gearing-limited, the Marshall hits 125mph at 4100rpm in 5th and 5100rpm in 4th.

 

Wait... Are you saying you're just complaining about engines you've modded?

I'm not sure what your point is? I could make an engine with a bazillion torque and yet have it not go passed 30mph by just giving it a very unrealistic torque curve. Please, when you mod these cars, use a torque curve from a real car, use the gear ratios(and final drive ratio) from the real car, and it will end up doing the right 0-60 time(ish) and right-ish top speed. Just making a torque curve with a certain amount of hp doesn't mean it'll go fast or slow. It's also the shape of the curve that affects your acceleration A LOT.

 

127 sounds pretty decent for a bulky, floppy car like that. What kind of figure would you expect from a real world equivalent?

 

Yeah, that's what's happening to me as well.
Thanks for confirming my doubts, I hope the issue is going to be solved in the race update.

 

Why not use both tyre models depending on context? a low speed and high speed wheel model choice wouldn't be unreasonable. Specializing a part may not be ideal but if you need to structure a wheel based on the purpose of the vehicle then you're probably doing something right. It may only be a temporary fix but take what you can while you can, right?

 

If I can just jack the thread here...

I took a graph of torque and hp, converted the torque to n/m, and put that into an engine jbeam and it made about 70hp less power than the graph/real engine did. the tq in this game is in newton meters right? where did I go wrong?

 

Is this a variant that will be added with the race update? Can you give us some details on it?

 

Could it because of the larger diameter and profile of the tires? I would think that the V beams would not work very well on smaller tires because of the node positions being more round with shaper angles on the beams.