Small but interesting EGR fact

T16 · 29th November 2012, 15:22

When the engine coolant is below a certain temperature, the ECU activates the EGR to speed engine warm up.

Thought that was a nice little fact when I read it.

I wonder how much difference it actually makes!

jonno12 · 29th November 2012, 15:36

mmm, wont activate too many then, nearly everyone has bypassed it

T16 · 29th November 2012, 15:54

Quote:

Originally Posted by jonno12

mmm, wont activate too many then, nearly everyone has bypassed it

Lol. Even I have to...

The only thing that made me do it was seeing the state of the manifold and EGR itself.

If they didnt build up all that **** I would have left it on, as I like the concept of what the EGR actually does...

I wonder if there is such a thing as an EGR that doesnt produce the gunk?

jonno12 · 29th November 2012, 16:37

if someone finds an alternative like that i'll be in the first half of the queue

sworks · 29th November 2012, 20:56

Most Egr systems cycle once on start up,with the newer cars which are quieter you can hear the change in engine tone as this happens. The egr's recirculating from cold over a controlled period of time to aid the engines warm up is quite new technology and more so Euro 5 and leading to 6 in conjunction with multiple injection cycles.

sworks · 29th November 2012, 20:58

Quote:

Originally Posted by jonno12

mmm, wont activate too many then, nearly everyone has bypassed it

Mines still there, reducing NOX and aiding cylinder cooling

T16 · 29th November 2012, 21:02

Quote:

Originally Posted by sworks

Mines still there, reducing NOX and aiding cylinder cooling

Heres a thing though, if it aides cylinder cooling, how will that help the engine warm up quicker?!

suzublu · 29th November 2012, 21:05

Quote:

Originally Posted by jonno12

if someone finds an alternative like that i'll be in the first half of the queue

It's called Petrol

sworks · 29th November 2012, 21:08

It helps cylider cooling when used normally. It opens generally with a duty cycle and is opened a pre set amount for a short time but very rarely held fully open. When used for quick warm up it is opened fully but is ported to the head differently to what normal egr is. Newer technology, so far only heard it to be used by Fiat so far

calibrax · 29th November 2012, 21:15

I find it a bit odd that the air comes in the air intake, gets compressed by the turbo, then goes through the intercooler to be cooled down (as the turbo will have heated it up). But then the EGR valve adds hot emissions to the mix before it gets to the cylinders! Surely warming up the air going into the engine right after you've just had it cooled down is highly inefficient...

29th November 2012, 15:22	#1
T16 I really should get out more....... ZT CDTi 135, ZT260SE Join Date: Feb 2011 Location: Dundee Posts: 2,877 Thanks: 10 Thanked 331 Times in 213 Posts	Small but interesting EGR fact When the engine coolant is below a certain temperature, the ECU activates the EGR to speed engine warm up. Thought that was a nice little fact when I read it. I wonder how much difference it actually makes!

29th November 2012, 20:56	#5
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,069 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	Most Egr systems cycle once on start up,with the newer cars which are quieter you can hear the change in engine tone as this happens. The egr's recirculating from cold over a controlled period of time to aid the engines warm up is quite new technology and more so Euro 5 and leading to 6 in conjunction with multiple injection cycles. __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

29th November 2012, 21:08	#9
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,069 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	It helps cylider cooling when used normally. It opens generally with a duty cycle and is opened a pre set amount for a short time but very rarely held fully open. When used for quick warm up it is opened fully but is ported to the head differently to what normal egr is. Newer technology, so far only heard it to be used by Fiat so far __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

29th November 2012, 21:15	#10
calibrax Posted a thing or two BMW 4 Series Join Date: Nov 2008 Location: Rochester, Kent Posts: 1,975 Thanks: 29 Thanked 37 Times in 28 Posts	I find it a bit odd that the air comes in the air intake, gets compressed by the turbo, then goes through the intercooler to be cooled down (as the turbo will have heated it up). But then the EGR valve adds hot emissions to the mix before it gets to the cylinders! Surely warming up the air going into the engine right after you've just had it cooled down is highly inefficient... __________________ Steve 2004 MG ZT+ CDTi 160 (sadly now gone!) 2015 BMW 435d GranCoupe XDrive

29th November 2012, 15:36	#2
jonno12 Posted a thing or two rover75 saloon connie Join Date: Mar 2011 Location: Solihull Posts: 1,003 Thanks: 78 Thanked 74 Times in 66 Posts	mmm, wont activate too many then, nearly everyone has bypassed it

29th November 2012, 16:37	#4
jonno12 Posted a thing or two rover75 saloon connie Join Date: Mar 2011 Location: Solihull Posts: 1,003 Thanks: 78 Thanked 74 Times in 66 Posts	if someone finds an alternative like that i'll be in the first half of the queue