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What are these red lights in my tachometer?

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Old 06-06-2012, 09:06 AM   #1
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Default What are these red lights in my tachometer?

There are more lights in the tachometer that light up when the car starts, but these are the only ones that stay lit. I cannot figure out what they are for.
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Old 06-06-2012, 09:16 AM   #2
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There are more lights in the tachometer that light up when the car starts, but these are the only ones that stay lit. I cannot figure out what they are for.
That's the engine's RPM redline limit. Your gauge is showing 6200 RPMs as the limit. The RPM gauge, depending on what engine the car has, will have those segments light up to match the engine's redline, so no need for different gauge for different engines used.
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Old 06-06-2012, 09:19 AM   #3
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Makes sense. Thanks for the quick reply.
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Old 06-06-2012, 09:22 AM   #4
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They are the Tachometer Red Zone, same as in any other car.

Here is a definition from Wikipedia:
"...On analogue tachometers, speeds above maximum safe operating speed are typically indicated by an area of the gauge marked in red, giving rise to the expression of "redlining" an engine revving the engine up to the maximum safe limit. The red zone is superfluous on most modern cars, since their engines typically have a rev limiter which electronically limits engine speed to prevent damage. ..."

http://en.wikipedia.org/wiki/Tachometer
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Old 06-06-2012, 09:25 AM   #5
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Originally Posted by manishaudi View Post
They are the Tachometer Red Zone, same as in any other car.

Here is a definition from Wikipedia:
"...On analogue tachometers, speeds above maximum safe operating speed are typically indicated by an area of the gauge marked in red, giving rise to the expression of "redlining" an engine revving the engine up to the maximum safe limit. The red zone is superfluous on most modern cars, since their engines typically have a rev limiter which electronically limits engine speed to prevent damage. ..."

http://en.wikipedia.org/wiki/Tachometer
I am use to having them painted on the Tachometer. Welcome to the digital age I guess. Kept starting at it wondering what the heck these lights were for.
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Old 02-25-2014, 09:58 PM   #6
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On the TDI, more glow when the motor is cold and then extinguish as the oil rises in temperature. Redline startS at 4,200 and when warm, 4,600. Pretty neat, but I doubt reving to 4,200 with cold oil is good for engine life.
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Old 02-25-2014, 11:23 PM   #7
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I think OP was referring to the smaller orange lights just inside the reducing redline lights. First time i saw those as well
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Old 02-26-2014, 05:26 AM   #8
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It shows you your redline in parallel to coolant temperature. If the car is cold its at a lower rpm (more red lights are shown). It will gradually move to where the redline is. I know this from my E60 M5 it was the same way.
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Old 02-26-2014, 07:29 AM   #9
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It shows you your redline in parallel to coolant temperature. If the car is cold its at a lower rpm (more red lights are shown). It will gradually move to where the redline is. I know this from my E60 M5 it was the same way.
Yep, my X5M had the same thing.
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Old 02-26-2014, 07:45 AM   #10
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I'm curious, but when tuned, do the lights change to reflect the new rev limiter, assuming that changes at all?
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Old 02-26-2014, 09:07 AM   #11
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It shows you your redline in parallel to coolant temperature. If the car is cold its at a lower rpm (more red lights are shown). It will gradually move to where the redline is. I know this from my E60 M5 it was the same way.
I think it's tied to oil temp since it can show only 4,400 rpm with coolant gauge showing normal. Have to run for while after coolant at normal before redline goes up to 4,600
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Old 02-26-2014, 09:15 AM   #12
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I think it's tied to oil temp since it can show only 4,400 rpm with coolant gauge showing normal. Have to run for while after coolant at normal before redline goes up to 4,600
I don't have any orange lights in my 2013 tach, only red, and they immediately light up to 6200 rpm when the engine is cold. Maybe it's only a TDI and 2.0T turbo thing?
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Old 02-26-2014, 10:22 AM   #13
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Originally Posted by snagitseven View Post
I don't have any orange lights in my 2013 tach, only red, and they immediately light up to 6200 rpm when the engine is cold. Maybe it's only a TDI and 2.0T turbo thing?
I dont have orange lights either but mine goes to 6400 rpm since I start the engine, are you sure yours is 6200?
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Old 02-26-2014, 10:35 AM   #14
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I dont have orange lights either but mine goes to 6400 rpm since I start the engine, are you sure yours is 6200?

It probably was 6400 - I was guessing. My point was the lights don't increase gradually to the max red line as the car warms up.
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Old 02-26-2014, 10:55 AM   #15
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It probably was 6400 - I was guessing. My point was the lights don't increase gradually to the max red line as the car warms up.
No they dont, BMW M cars do (for warming up and breaking period) , not sure about normal BMWs
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Old 02-26-2014, 04:54 PM   #16
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It probably was 6400 - I was guessing. My point was the lights don't increase gradually to the max red line as the car warms up.
S6's do. Also if there was an engine issue and the computer wants to limit the rev's the lights will change to the computer enforced red-line.
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Old 02-26-2014, 07:01 PM   #17
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Looks like it's only found on the turbo and diesel engines but not the 3.0T for some reason.
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Old 02-26-2014, 07:18 PM   #18
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Looks like it's only found on the turbo and diesel engines but not the 3.0T for some reason.
Not to be pedantic, but aren't you really saying "Looks like it's only found on the turbo engines, but not on the mechanically supercharged engine." (Aren't all the "diesel" engines also turbocharged?)

Seems to me to be a turbo-only feature
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Old 02-27-2014, 03:56 AM   #19
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Not to be pedantic, but aren't you really saying "Looks like it's only found on the turbo engines, but not on the mechanically supercharged engine." (Aren't all the "diesel" engines also turbocharged?)

Seems to me to be a turbo-only feature
Rich, Well, yeah, of course. Let's shorten that up - "....Audi turbocharged engines only". Thanks for pedantically clarifying that.
A side question: do all brands and models of auto diesel engines have turbochargers by design?
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Old 02-27-2014, 04:13 AM   #20
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Rich, Well, yeah, of course. Let's shorten that up - "....Audi turbocharged engines only". Thanks for pedantically clarifying that.
A side question: do all brands and models of auto diesel engines have turbochargers by design?
Sorry, all I really meant was that you seemed puzzled why the 3.0T lacked this feature - and to me it seemed like the turbo was the common feature (rather than a gas vs diesel distinction). It does appear that turbos are becoming far more common in diesels as well as gasoline engines these days, but to your point - my 1982 Isuzu I-mark diesel was normally aspirated

ETA: well my comments were in relation to the "Audi C7 platform A6 models" in which the thread is found
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Old 02-27-2014, 04:13 AM
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