What are these red lights in my tachometer?

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Feb 26, 2014 | 09:07 AM

#11

Street

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Quote:

Originally Posted by vigoureux

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

Feb 26, 2014 | 09:15 AM

#12

snagitseven

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From: SE Massachusetts, U.S.

Quote:

Originally Posted by Street

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?

Feb 26, 2014 | 10:22 AM

#13

~~feralc~~

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From: CA

Quote:

Originally Posted by snagitseven

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?

Feb 26, 2014 | 10:35 AM

#14

snagitseven

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From: SE Massachusetts, U.S.

Quote:

Originally Posted by feralc

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.

Feb 26, 2014 | 10:55 AM

#15

~~feralc~~

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From: CA

Quote:

Originally Posted by snagitseven

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

Feb 26, 2014 | 04:54 PM

#16

mwar99

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Joined: Dec 2011

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From: Northern NJ

Quote:

Originally Posted by snagitseven

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.

Feb 26, 2014 | 07:01 PM

#17

snagitseven

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From: SE Massachusetts, U.S.

Looks like it's only found on the turbo and diesel engines but not the 3.0T for some reason.

Feb 26, 2014 | 07:18 PM

#18

Richard Solomon

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Quote:

Originally Posted by snagitseven

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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Feb 27, 2014 | 03:56 AM

#19

snagitseven

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From: SE Massachusetts, U.S.

Quote:

Originally Posted by Richard Solomon

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?

Feb 27, 2014 | 04:13 AM

#20

Richard Solomon

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Quote:

Originally Posted by snagitseven

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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