EGR blanking mod and parts on e-bay

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Freelander Beaver

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Just took the dim's from the EGR valve last night as I was going to make something at work today to replace it and improve the flow.. I've also seen the ones on E-bay where it suggests a 40% increase in flow etc over the orig unit...
The question I have is that the available flow hole thru the existing unit is about 1485mm sq taking into account all the bobbin and internal features in there... but up stream from this, you have the MAF meter that lives in a bore of 42mm.. therefore 1385mm sq... so is there any real advantage in increasing the flow of this unit as there is a smaller bore before it?... Also the bend in the moulded feed to the EGR just before the rubber pipe looks even smaller... but you can't measure this unless you section the moulding?... Any thoughts??
 
I tried to make this point in the EGR mod sticky at the top of the page. I think the sensor housing your referring to is the IAT sensor which is indeed approx. 42mm dia. which is about 10mm smaller than the original EGR valve.
My opinion is included in the sticky thread above(from page 10). As most people just remove a dirty or even faulty EGR valve and replace with the dummy valve they attribute all the gains to the increase in size whereas I believe most of but not all the gain could be achieved without the swap. Opinion is still divided but I'm not sure many have actually tried both options.

:behindsofa: :D
 
Freelander Beaver said:
Just took the dim's from the EGR valve last night as I was going to make something at work today to replace it and improve the flow.. I've also seen the ones on E-bay where it suggests a 40% increase in flow etc over the orig unit...
The question I have is that the available flow hole thru the existing unit is about 1485mm sq taking into account all the bobbin and internal features in there... but up stream from this, you have the MAF meter that lives in a bore of 42mm.. therefore 1385mm sq... so is there any real advantage in increasing the flow of this unit as there is a smaller bore before it?... Also the bend in the moulded feed to the EGR just before the rubber pipe looks even smaller... but you can't measure this unless you section the moulding?... Any thoughts??
Click to expand...
erm ... ...dunno really.. .. .better wait an see what our leader Ming sez [eez a rockit engineer y'know] .. . . .... .... ...:D
 
Just had a look at your previous post... as long as the cleaned EGR valve has a bigger bore that some other part up steam ie the MAF tube, then it becomes of little use to increase the flow in this area... it's already determined by the previous restriction?... I think your right.. the improvement is made by 1. cleaning the valve and 2. stopping the exhaust gas into the inlet and therefore increasing oxygen per suck and reducing the temp.... I can't see how it can add anything more to it....
 
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