[Lnknprkfrk28]

Hey guys, hoping you could provide a resolution and some feedback. I am experiencing an issue with just my speedometer gauge. I filled up 91 octane today and hit the freeway, after driving 10 minutes I noticed my meter stated I was going 80 mph but didn't seem like 80, more like 65-70. Clearly my speedometer wasn't accurate. I decided to exit and see if my idle was normal. Sure enough every time I came to a stop my meter read 0 mph instead of idling at about 0.5 or 1. Speedometer is definitively not working accurately. Any thoughts what it might be? I have an 2012 335i coupe manual. About 50k miles. Any feedback or thoughts is greatly appreciated.

Thank you

[sankohuy]

Did you just noticed this or it has been happen for some time? Did you know our car's speedometer is about 3-5mph off on purpose right?

[Sgop335]

Originally Posted by Lnknprkfrk28

Hey guys, I decided to exit and see if my idle was normal. Sure enough every time I came to a stop my meter read 0 mph instead of idling at about 0.5 or 1. Speedometer is definitively not working accurately. Any thoughts what it might be? I have an 2012 335i coupe manual. About 50k miles. Any feedback or thoughts is greatly appreciated.

Thank you

Kidding right?

[damonp335i]

Originally Posted by sankohuy

Did you just noticed this or it has been happen for some time? Did you know our car's speedometer is about 3-5mph off on purpose right?

I have read this before as well.. I know the speedo is off, but why? Is there any real reason behind it?

[Delta0311]

Originally Posted by damonp335i

I have read this before as well.. I know the speedo is off, but why? Is there any real reason behind it?

Yes because BMW wants all 328 owners to feel good about their 0-60 times.

[Fundguy1]

It's off typically by 2 mph or so at 80 mph. Varies by tire diameter and wear. Use an aftermarket GPS to get true speed. My speedo is 1.5 mph fast at 84 mph.

[sankohuy]

Originally Posted by damonp335i

I have read this before as well.. I know the speedo is off, but why? Is there any real reason behind it?

You can have it code to display the true speed on you dash

[floydarogers]

Originally Posted by damonp335i

I have read this before as well.. I know the speedo is off, but why? Is there any real reason behind it?

All you have to do is Search, there have been many threads on this. Reason in a nutshell: EU and USA/CA laws require it. Look on Car & Driver's website for a good explanation.

[Tom K.]

Originally Posted by Lnknprkfrk28

my meter stated I was going 80 mph but didn't seem like 80, more like 65-70. Clearly my speedometer wasn't accurate. I decided to exit and see if my idle was normal. Sure enough every time I came to a stop my meter read 0 mph instead of idling at about 0.5 or 1. Speedometer is definitively not working accurately. Any thoughts what it might be? I have an 2012 335i coupe manual.

Thank you

When traveling at 80 mph in 6th gear, your tachometer should read about 2,900 rpm, at 65 it should read around 2,300 (each number on the tach face must be multiplied by 1,000). So you can use that as a check of your true speed.

When you are stopped, your speedometer should naturally read 0 mph and your tach should read around 600 or 700 rpm.

If, in fact, your tachometer reads 0 when stopped, either your motor has stalled or the tach is inoperative and should be repaired.

Tom

[fazman]

Originally Posted by Lnknprkfrk28

Hey guys, hoping you could provide a resolution and some feedback. I am experiencing an issue with just my speedometer gauge. I filled up 91 octane today and hit the freeway, after driving 10 minutes I noticed my meter stated I was going 80 mph but didn't seem like 80, more like 65-70. Clearly my speedometer wasn't accurate. I decided to exit and see if my idle was normal. Sure enough every time I came to a stop my meter read 0 mph instead of idling at about 0.5 or 1. Speedometer is definitively not working accurately. Any thoughts what it might be? I have an 2012 335i coupe manual. About 50k miles. Any feedback or thoughts is greatly appreciated.

Thank you

works as designed, normal operation... search for the answer... nothing to see here.

[Welcome to NBA Jam]

Originally Posted by damonp335i

I have read this before as well.. I know the speedo is off, but why? Is there any real reason behind it?

It allows BMW to fit various wheel sizes with minimal changes. It's illegal for a speedometer to read even 1mph slower than you're really going, but perfectly fine if your speedometer reads 1mph faster than reality.

[CookMaster]

Lower speed vs indicated is a standard on European cars. The speedo cannot ever be over the actual speed. The USA deviation is 2-3 mph depending on your speed. The faster your speed, the higher the deviation. It's been liberally discussed in other forums.

[Mr. Toad]

Originally Posted by Tom K.

When you are stopped, your speedometer should naturally read 0 mph and your tach should read around 600 or 700 rpm.

If, in fact, your tachometer reads 0 when stopped, either your motor has stalled or the tach is inoperative and should be repaired.

Tom

Glad to see I'm not the only one who thought the OP's concern that "I came to a stop my meter read 0 mph instead of idling at about 0.5 or 1. Speedometer is definitively not working accurately." was a bit odd.

[csu87]

[04gto]

Originally Posted by Mr. Toad

Glad to see I'm not the only one who thought the OP's concern that "I came to a stop my meter read 0 mph instead of idling at about 0.5 or 1. Speedometer is definitively not working accurately." was a bit odd.

I think we were the only ones who read the OP's actual post and not JUST the title. Willing to bet English is OP's second language. Hope they figured out the difference between "Speed"ometer and "Tacho"meter pretty quickly, it is kinda important.

[wilbur_the_goose]

My other car is a very nice '14 Honda Civic coupe (pretty darn sporty, actually).

I keep having to remind myself that the indicated speed in the Honda is REAL, unlike the BMW. It helps me keep my speed where it needs to be if I'm driving through an area known for speed traps.

[mweisdorfer]

You can get an app for your phone and measure actual mph. You can also code in mph in your screen where you can flip data such as mpg avg and actual etc.

You could also get bigger rims/ tires which would correct the situation almost entirely.

[Wilt]

Originally Posted by Fundguy1

It's off typically by 2 mph or so at 80 mph. Varies by tire diameter and wear. Use an aftermarket GPS to get true speed. My speedo is 1.5 mph fast at 84 mph.

Typically 4% error! ...greater MPH error at 80 mph than at 60 mph, not a fixed MPH offset.

In my 2011 328i with 225x45-17 Contis this was verified against GPS reading. At 80mph (driving thru NV) the dial guage would read 84 mph, while the digital and the GPS both said 80 mph. A year ago I coded the digital speedometer display to be ON, turned OFF the digital 'correction', and the digital display MATCHES my GPS precisely.

The BMW is this way because of EU regulations they must adhere to, which mandate that they never display a lower speed than actual, and I understand that the fines for them are massive.

• The indicated speed must never be less than the actual speed, i.e. it should not be possible to inadvertently speed because of an incorrect speedometer reading.
• The indicated speed must not be more than 110 percent of the true speed plus 4 km/h at specified test speeds. For example, at 80 km/h, the indicated speed must be no more than 92 km/h.

From a Ferrari chat on web: "Well, at least my speedometer gauge said 165. The other day while testing out my 360, I noticed a huge discrepancy between speedometer and GPS. My GPS stated 136mph, but the speedometer specified 165mph. " and a response to that post, "Ferrari (and Lambo even more) speedometers have always been notoriously optimistic."

[Eddien123]

Originally Posted by Delta0311

Yes because BMW wants all 328 owners to feel good about their 0-60 times.

Well wouldn't that make 335 owners feel the same since it also gives them a false reading?

[Sha]

Enable the real one and you dont have to worry about it