egr valve

Rocketrooney · Post by **Rocketrooney** » Mon Mar 11, 2013 2:11 pm

what needs to be done to remove the EGR valve, how do you get the cel code to not be on when you do remove it

Post by **ddoubledanny** » Mon Mar 11, 2013 2:31 pm

I think it's just a case of removing all the gibbons blocking the vac lines but to remove the cell I don't know I think you need a ecu then have it changed ona custom map

bb1boy · Post by **bb1boy** » Mon Mar 11, 2013 2:36 pm

http://www.preludezone.com/3rd-gen-hond ... moval.html

bb1boy · Post by **bb1boy** » Mon Mar 11, 2013 2:37 pm

^^Not sure if it is the same but these guys say there is no point in removing it...

Post by **Merlin** » Mon Mar 11, 2013 2:58 pm

PerformanceAutoworks wrote: The EGR system was brought into play through increasingly stringent emissions regulations, not just carbon monoxide but nitrogen oxide (NOx) as well. The EGR is focussed towards the NOx reduction part of the equation but also aids with reduction of hydrocarbons or unburnt fuel.
NOx is an inert gas it does help with the reduction of cylinder combustion temperatures but at a sacrifice to some power. The cooler cylinder temps have the knock on effect of producing less NOx and so the cycle continues. This is obviously good for the tree huggers but not so desirable for the power hungry petrol head as valuable cylinder capacity is being taken over by unwanted inert gasses.
The argument that without the EGR system the combustion temps will be too high and cause problems is unfounded tbh. The EGR will never be open at WOT, the ecu will be in "open loop" fixed map mode Honda use oil squirters to cool the piston undersides and over fuel the higher rpms to control cylinder temps.

If using an OEM ECU
Earlier systems like the 4th gen Prelude are pretty dumb meaning that there are no significant changes to the ecu map while the EGR is in operation. These can be blanked off with an alloy plate sandwiched between the EGR valve and the inlet manifold. The egr is in place and still connected so the ECU "sees" it is working. No problem here and no detrimental effect. MOT emissions tests won't be affected so no worries there either.

The 5th gen is pretty similar althgough being a later spec OBD2 system it is a little more sensitive so can throw up an error code even if left connected. For the most part you can get away with it though.

ATRs suffer alot with EGR related faults as these are very sensitive and will throw error codes for EGR flow problems. Simply blanking these off will throw an error code.

If running with a Hondata or other aftermnarket ECU you can simply remove the EGR valve and blank the manifold completely, remove the assosiated EGR lift solenoid and purge valves etc as well.

In all honesty the gains you make by simply blanking it off on a stock ecu are negligable as the ECU is mapped with the EGR system in mind. Removal and full re-map then yes it definately helps to maximise what you have.
The peak power gains will be marginal as the EGR is not open during this period (of WOT and high rpms) however there will be some carry over of contaminated intake charge. Most gains will be made through midrange/partial throttle conditions where usable power can be improved.

I'm not saying that gains are all down to the EGR, quite clearly it's not but the fact remains that EGR does inhibit the potential of an engine to produce power as it will contaminate the intake charge

http://www.ludegeneration.co.uk/post10641.html

Rocketrooney · Post by **Rocketrooney** » Mon Mar 11, 2013 4:48 pm

reason for removing is for skunk2 intake which i've installed, bought it off a boy a long while back he never supplied the extra brackets for relocating the egr. think i'm going to have to make a blanking plate for it and hide it away somewhere until i fit the the p28 ive got

mercutio · Post by **mercutio** » Mon Mar 11, 2013 7:40 pm

i might have all of those brackets for the skunk intake

Rocketrooney · Post by **Rocketrooney** » Mon Mar 11, 2013 11:53 pm

have you pics of the brackets man, i would be interested if your willing to sell

mercutio · Post by **mercutio** » Tue Mar 12, 2013 7:20 am

will have to dig them out of my shed buddy are you in a rush?

Rocketrooney · Post by **Rocketrooney** » Tue Mar 12, 2013 8:49 am

that would be great man, pm me price and do you paypal