[AndreyT]

Originally Posted by N8N

e.g. for a 2% grade you could be going 55 + 55 (sin(tan^-1(.02))) or about 56.1 MPH! You scofflaw you!

The math is actually incorrect.

As you correctly noted, 2% grade means that the tangent of the angle of inclination alpha is 0.02. Which means that alpha itself is equal to arctan(0.02) (or tan^-1(0.02) if you prefer). This is approximately 1.1457° angle of inclination. So far so good.

However, now in order to convert horizontal distance (or horizontal speed Vhor) into actual distance (or speed V) you have to divide the horizontal distance (or speed) by cos(alpha). So, the actual speed V is equal to Vhor / cos(arctan(grade)), not Vhor + Vhor * sin(arctan(grade)). I don't know where you got the latter formula.

For 55 mph of horizontal speed, the actual speed on 0.02 grade would be only 55.01 mph, not 56.1 mph as you incorrectly calculated.

You can easily overthrow your own formula by testing it on a trivial input: Vhor = 1mph and alpha = 45°. Obviously, the actual speed should end up approximately equal to 1.41 mph (diagonal of a unit square). Your formula produces 1 + 1 * sin 45° = 1.7 mph, which is not even close.

[ZBoater]

Ummmm, I'm pretty sure the correct answer is 42.

[GB-335xiCoupe]

Originally Posted by ZBoater

Ummmm, I'm pretty sure the correct answer is 42.

I was thinking the same exact thing!

[ssmith96]

Originally Posted by CruzS4e92

that annoys me, when you open the door and the window stops.

I think that can be coded to work, it annoys me too

[E90M0nster]

Originally Posted by Cbozz

IDK if anyone mentioned but to change the volume of the guiding speaker of your navigation you have to wait till she says something and then turn the volume knob... it will only work while she's speaking!

haha damn i didnt know that

[lilez19]

i read most of the codes here.. but for some reason.. i have a 335i and i dont have an panic button, heard i could open the door with just touching the door handle and so far isnt working on me

[SirHoward]

I don't know if anyone post this, but CA doesn't work when iPhone in the same pocket as key.

[GB-335xiCoupe]

Originally Posted by lilez19

i read most of the codes here.. but for some reason.. i have a 335i and i dont have an panic button, heard i could open the door with just touching the door handle and so far isnt working on me

This means you probably don't have the "Comfort Access" option...

[sy2767]

Originally Posted by GB-335xiCoupe

This means you probably don't have the "Comfort Access" option...

I noticed the same thing and I certainly have CA!

[Stock-ish]

Big fan of the handles built into the underside of the trunk lid so you can close the trunk without having to touch the paint

I just found them a few months ago, so thought they'd be worth adding to this thread since it was already bumped. Apologies if one of the other 2100 posts was about this, I didn't re-read all of them.

[mythek]

this works on my 2008 335i

After getting out of the car and locking it, I realize that i forgot to roll up the windows. Just leave your hand on the the door handle like you're trying to lock it, and the windows will start rolling up .

[alexwhittemore]

Originally Posted by GB-335xiCoupe

..and THIS is why I use my GPS for my speedometer. I suppose you are going to tell me that a Garmin GPS has a built-in tolerance delta too.

So all these 0 to 60 tests are bogus... no wonder cars seem to be getting faster and faster! It's really only 0 to 58mph. If you think you are going 100mph, you are really only going 96.

And what effect does this have on MPG/Fuel efficiency calculations? Sounds like a govt conspiracy to me!

It DOES have a tolerance, for sure! Usually something like +/- 3ft. But that depends on your exact chipset and the quality of current satellite acquisition.

But the point is that GPS measures speed as the integration between points rather than directly, so the error isn't the same. GPS speed will be least accurate when you're moving slowly and will increase in accuracy with speed.

For example, say you measured two points an hour apart in time, and 1 mile apart in real distance. With +/-3ft accuracy, your distance measurement will be 1mi +/-6ft. As a percentage that's quite low. Say you measured quickly though, moving two feet between points - the gps could say you went BACKWARDS 4 feet and still be within accuracy spec.

That said, while gps's absolute accuracy might be 3ft, it doesn't drift much. The differential is usually quite accurate.

As for uphill, it's been said: if your GPS has a lock on at least 4 satellites, you can measure absolute position including altitude. The GPS will know you're going uphill - it's measuring your velocity in three dimensions then CALCULATING speed.

[anas]

i don't know why, when i press the unlock button twice (on the key ) to unlock the car , when i open the door the window automatically goes down and when i close the window closes.

if anybody knows the purpose of that feature

[insane79]

Originally Posted by anas

i don't know why, when i press the unlock button twice (on the key ) to unlock the car , when i open the door the window automatically goes down and when i close the window closes.

if anybody knows the purpose of that feature

wow, do all windows go down or only driver side? will have to try this on my e90 tom

Thanks.

[johmei]

Originally Posted by anas

i don't know why, when i press the unlock button twice (on the key ) to unlock the car , when i open the door the window automatically goes down and when i close the window closes.

if anybody knows the purpose of that feature

Works on E92/93s to make getting in easier. Helps a lot in tight places!

[Mech_Man]

Correct, if you click & hold the unlock button for over a second or two, the windows will go go down (as long as you keep holding the button, so you can stop half way if you want, and if you keep holding it, the sun roof will then open.
Very handy if you let the car get super-hot in the sun, (and don't have tint!)

[alexwhittemore]

Originally Posted by Mech_Man

Correct, if you click & hold the unlock button for over a second or two, the windows will go go down (as long as you keep holding the button, so you can stop half way if you want, and if you keep holding it, the sun roof will then open.
Very handy if you let the car get super-hot in the sun, (and don't have tint!)

I don't think this is what he was referring to.

[TB 335i E92]

hi Guys,

I am new to the forum. I will have some questions later.


My car is an E92 335i bought from Atlanta. Excellent one!
It is M-paket outside. I did the LCI upgrade already. Planning on Performance brakes, diffuser and exhaust system yet. However on the brake side I am not sure as I was given the information it does not apply to 335i.

This is the system:
http://www.ebay.de/itm/BMW-M-Perform...item51ad6fd182

Is there anyone having it on?

On the window drive by key I was told by my coder it is dependent on the market how BMW sets it up. My car was only doing it one way, if I recall it right only the opening function was active.
He coded for full control.

Cheers,
TB

[fix_bks]

Here's a stumper. Can anyone tell me what that little circle on the dash is just to the left of the tach? (follow the yellow arrow in the picture):

[DJ.E92]

Originally Posted by fix_bks

Here's a stumper. Can anyone tell me what that little circle on the dash is just to the left of the tach? (follow the yellow arrow in the picture):

When you exceed redline it should blink?

[snowman81]

Originally Posted by fix_bks

Here's a stumper. Can anyone tell me what that little circle on the dash is just to the left of the tach? (follow the yellow arrow in the picture):

If you're talking about the circle that looks like it has an exclamation point in it, I'm fairly certain it's the low tire pressure indicator. I would have to double check the manual to be sure though.

[stiggie]

Originally Posted by SoYank

When you've turned your wipers on and then stop the vehicle in traffic, the wipers stop as well.

they don't stop. They just go to a slower mode