does anyone know a decent technique to remove the EGR valve and plug up the holes left?

 

i've got the replacment instructions from the twin turbos of dallas site, but i want to remove them all together while i've got the engine out getting the turbos done.

 

i was told theres a method using a 2p coin and some JB weld but dont know what the actual method is.

 

any ideas?

 

thanks, Ed

This might help - http://www.300degree.com/hard_parts/egrkit/

 

Vijay

cheers vijay, apparently it takes months for the thing to arrive though so i cant really wait for that.

I glued two coins to the bottom of the plenum to fill up the EGR holes there. (use strong glue though ! ;) )

what glue did you use mate?

 

also, is it obvious where the coins should go, cos the mechanic im using hasnt rmoved them before.

 

cheers for your help mate.

it was 2 component epoxy suitable for aluminum and other metals.

 

Once you remove the plenum/pipes it's very obvious where the holes are that need to be covered by the coins.

Hello Mate,

 

You take two pennies and use a glue called JB weld from a big halfords, suitable for high heat and glueing metal!

 

You then need to take the old bolt in unit and find a suitable bolt to fill the vacant hole!

 

Nice to see you back Lymon where you been!

thanks for your replys lymon and topless.:D

 

i didnt realise you needed to remove the plenum to get to the EGR stuff! :( is it a lot easier to remove the plenum with the engine removed? i guess it is as a lot of stuff is already removed to get the engine out.

 

whats that about a bolt? do two coins not fill all the holes left over?

No - you need to block off the pass side exhaust manifold where the EGR takes the EG from - 22mm spanner to remove it IIRC. Plumbers store should have something suitable....

cheers andy, so should be a very simple job while the engine's out doing the tubs?

 

have you done this job yourself?

Yes...... and yes! :D

good stuff, finaly an easy job on the zed :D

 

so does one of the pennies go over a hole on the manifold? where abouts does the other one go?

 

just need to check cos although the mechanic has worked on zeds before (used to work for nissan) he hasn't removed an EGR valve before, although probably not many mechanics have! :D

So it's easy to do with the engine out. What about with the engine in? and what are the pros and cons of doing this? Is it purely a tidying exercise? If so, why were they put there in the first place?

EGR valve passes exhaust gasses back into the intake chamber under cruise conditions. This has 2 effects. It effectively decreases the capacity of the engine as some of the combustion mixture consists of spent gasses. Secondly it decreases the cylinder temperatures.

 

The only real reason for removing it is that if it fails, its engine out again (or comparable labour costs). If it does fail it will cause drivablility problems, due to vacuum/boost leaks.

 

Did I say it was easy? :confused: :D

that's why im getting rid of mine, really dont want to take the engine out again so mite as well do it now, plus it's quite simple to do (isn't it andy? :D )

 

if you've done this on your car, did you notice any change in engine temps or performance, i've heard there isn't anything to be noticed really.

 

just re-checking, one penny goes over hole by passinger side manifold and other one goes over a hole left where the EGR valve would have been?

 

cheers, Ed

reducing combustion temperatures reduces the risk of detonation, allowing higher boost.................

 

EGR works by lowering the combustion temperature..................

 

you want to remove EGR..........

 

discuss. ;)

 

i agree that exhaust gasses being put back into the combustion chamber is a far from ideal way of reducing temps but is there any downside to removing it??

 

the primary reason is emmision control - more precisely NOx which is formed at high combustion temperatues which a TWC cannot do anything with

i remember talking to arron (jb) bout removing them as he has done it. IIRC he said he had not noticed any increase in engine temps after having removed the EGR valve.

 

basically i just want to remove all the things on the car which can go wrong and cost alot to fix. i think duffer has removed his also and i dont think there has been any problems, although i dont know if he's running higher boost.

 

but surely putting exaust gases in isnt going to lower temps that much, as the gas is coming from the manifold where the gases must be at a pretty high temp still. are these valves not just an attempt to make the car look more environmentally friendly (needs the help with the mpg these things get:D ) as the japs seem to be quite in favour of these sort of measures?

remember, we are talking about combustion temperatures, not engine temps.

 

if youre interested in EGR, this is a very interesting document: EGR description :)

Won't decrease it much? Think about it! The exhaust that gets passed back is at a MUCH lower temperature than the mixture that takes the same space would be at ;) EGTs at cruise WILL go up as will partial throttle - I know cos I've done it and I have the guages. Since chipping its nowhere near as bad though so not so much of a problem. If I was you I would remove it. Its just another weak link in the chain....

i dont know whether its the internet at uni or not, but that link doesn't work for me. good point though, i was forgeting that combustion temps are relevant not engine temp when talking bout boost, ooops :o

 

duffer, what did the chip change about the way the car ran once you had removed the EGR stuff? the point i was trying to make was that the exhaust gases would still be hotter than the air fuel mix (although not obviously as hot as the temps inside the cylinder). so doesn't the cooling effect just come from the fact that there are non combustable gases in the cylinder. something you couldn't do by just allowing in air that you dont fuel for as this would cause the engine to run lean and so increase temps? i wrote it crap though, so didn't get that across! :o

 

oh yeah, look what i came across when i was looking for some info on this stuff. it's off the north american subaru impreza club site.

 

What I'm wondering is, when you exceed the maximum compressor efficiency of a turbo it goes into like a "subsonic" mode where it just heats the air up and you start losing hp. A 300zx hits this around 12 PSI of boost.

 

anyone smell bull s**t? :eek: