can i put a dump valve on an automatic?

iancho · Sep 29th, 2012, 20:29

and what would be the pro's and con's? would it do any damage and would it sound good?

JamesV70R · Sep 29th, 2012, 21:07

What car? Year/engine?

You wouldn't get anything from it during gear changes, as the throttle plate stays open during changes on an auto, You'd only get a noise when you come off the throttle.

If you car is ME7 (Post 99 with an electronic throttle) they don't like them as they mess up the fuelling. They offer no performance increase though.

iancho · Sep 29th, 2012, 21:48

98 v70 R

strbryan · Sep 30th, 2012, 00:50

The fact your even asking the question would indicate your lack of knowledge...

JamesV70R · Sep 30th, 2012, 01:21

The answer in that case .. is yes you *can* .. but you won't get anything.

With the car being an auto the throttle stays open through gear changes so it won't dump any of the air anywhere.

Stick with the standard recirc system imho. If you want noises fit a big cone filter, that'll let more of the recirc noise out (Which isn't a bad noise on it own!)

850Chris · Sep 30th, 2012, 14:01

Quote:

Originally Posted by strbryan

The fact your even asking the question would indicate your lack of knowledge...

Someone's got out the wrong side of bed again! How not to create a friendly open forum eh?

d2k · Sep 30th, 2012, 14:54

Quote:

Originally Posted by strbryan

The fact your even asking the question would indicate your lack of knowledge...

is that not what forums are for...???

JamesV70R · Sep 30th, 2012, 15:20

Quote:

Originally Posted by strbryan

The fact you're even asking the question would indicate your lack of knowledge...

FTFY ^^

I think that pretty much sums up *EVERY* reaction to your obvious post. Even those replies from people who can't be bothered replying.

The reason OP asked is because he wants to know. If he had the knowledge of whether a dump valve would work on an automatic, do you really think he would have asked the question? Really?

I await your informed reply.

semioldV50owner · Sep 30th, 2012, 15:28

Hi All did not want to start a new thread to something similar so I hope the OP does not mind me asking in this one, Can I fit a Dump valve to my 08 V50 D5 and would there be any benefit? If so what are the Pro's and Con's? Tar Me

JamesV70R · Sep 30th, 2012, 15:44

Pretty much the same answer, No.

The main difference is a Diesel doesn't have a traditional throttle body, so it'll never fire off. (As I understand it.)

The only differences between an atmospheric dump valve and a recirculating one are that one puts all the air that *would* be dumped into the engine bay back in to the intake pipe just before the turbo.

From ME7 onwards the air coming in to the engine was measured just after the air filter by the MAF, if you go dumping air thats been measured in out of the system then it'll make the engine run briefly rich - over time the engine gets its knickers in a twist and it can do all sorts of strange things like go into limp mode.

An atmospheric dump valve also makes you sound like a chav. There is no performance difference.

Sep 29th, 2012, 20:29	#1
iancho one of many Last Online: Apr 13th, 2021 22:10 Join Date: Sep 2009 Location: Oxford	can i put a dump valve on an automatic? and what would be the pro's and con's? would it do any damage and would it sound good?

Sep 29th, 2012, 21:07	#2
JamesV70R Forum Support Team Last Online: Today 00:29 Join Date: Aug 2009 Location: Watford	What car? Year/engine? You wouldn't get anything from it during gear changes, as the throttle plate stays open during changes on an auto, You'd only get a noise when you come off the throttle. If you car is ME7 (Post 99 with an electronic throttle) they don't like them as they mess up the fuelling. They offer no performance increase though. Last edited by JamesV70R; Sep 29th, 2012 at 21:10.

Sep 29th, 2012, 21:48	#3
iancho one of many Last Online: Apr 13th, 2021 22:10 Join Date: Sep 2009 Location: Oxford	98 v70 R

Sep 30th, 2012, 00:50	#4
strbryan I've Been Banned Last Online: Nov 2nd, 2016 18:20 Join Date: Nov 2006 Location: Coppull View Photos By: strbryan	The fact your even asking the question would indicate your lack of knowledge...

Sep 30th, 2012, 01:21	#5
JamesV70R Forum Support Team Last Online: Today 00:29 Join Date: Aug 2009 Location: Watford	The answer in that case .. is yes you can .. but you won't get anything. With the car being an auto the throttle stays open through gear changes so it won't dump any of the air anywhere. Stick with the standard recirc system imho. If you want noises fit a big cone filter, that'll let more of the recirc noise out (Which isn't a bad noise on it own!)

Sep 30th, 2012, 15:28	#9
semioldV50owner Nemesis Last Online: Jul 6th, 2013 15:51 Join Date: Sep 2012 Location: Surrey	Hi All did not want to start a new thread to something similar so I hope the OP does not mind me asking in this one, Can I fit a Dump valve to my 08 V50 D5 and would there be any benefit? If so what are the Pro's and Con's? Tar Me

Sep 30th, 2012, 15:44	#10
JamesV70R Forum Support Team Last Online: Today 00:29 Join Date: Aug 2009 Location: Watford	Pretty much the same answer, No. The main difference is a Diesel doesn't have a traditional throttle body, so it'll never fire off. (As I understand it.) The only differences between an atmospheric dump valve and a recirculating one are that one puts all the air that would be dumped into the engine bay back in to the intake pipe just before the turbo. From ME7 onwards the air coming in to the engine was measured just after the air filter by the MAF, if you go dumping air thats been measured in out of the system then it'll make the engine run briefly rich - over time the engine gets its knickers in a twist and it can do all sorts of strange things like go into limp mode. An atmospheric dump valve also makes you sound like a chav. There is no performance difference.

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