Hey guys

 

while i'm rebuilding the engine, i was thinking of not putting the EGR walve back on and capping the inlet holes to the plenum and making them air tight.

 

Has nyone done this and has anyone had any problems?

 

I didnt think that it would cause a problem as its not electronically controlled, as far as i know only pressure/vacuum.

 

cheers

 

Latz

 

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There has been quite a debate about EGR-removal on tt.net

Some people that did it had regrets because the engine ran much hotter then before and the engine started to detonate

Other people didn't notice any difference.

 

Personally I'd leave it on, if it's still working fine

 

-Eric

 

BTW: the EGR on the Z is electronically controlled by the ECU

 

 

[This message has been edited by lymon (edited 15-03-2002).]

Had mine removed. no problems.

 

Lymon, I can't see how it could affect engine temp?

taken from the EGR-replacement/removal tech on ttzd.net:

 

When optimal air/fuel mixture is attained (14.7:1), the combustion process creates several different nitrogen oxides (NOx) because the combustion chamber is operating at over 2000° F . To reduce the NOx emission, the combustion chamber temp must be lowered. So the Exhaust Gas Recirculation (EGR) valve recirculates the now inert exhaust gas back into the combustion chamber to lower the total volume of combustable mixture. This results in a slight loss of power. Too much EGR flow will result in poor fuel economy, rough running and increased emissions. Too little flow can possibly cause internal engine damage from overheating.

 

but as I said...some people noticed no difference without the EGR.

I guess it depends on the way you drive and the setup of your car.

 

-Eric

 

[This message has been edited by lymon (edited 16-03-2002).]

The egr return pipes to my plenum were blocked so my setup wasn't working properly anyway.

 

Didn't notice any difference with it being blocked up so we removed it as planned.

 

Steve

Not on a Nissan no. However several times on the (dare I say it here) Ford Cosworth 24V. The problem that you find on that engine (vsimilar management) is that you lose the small amount of airflow through the egr system. Not a problem at constant engine speeds or idle (the ISCV / Idle Speed Control Valve picks that up). However during the transition to idle the ISCV does not react quickly enough. Result stally car. You need to find a way to jack up the base idle, however on the cosworth simply jacking it up on the throttle stop affects the throttle position sensor such that it doesn't beleive its at idle (stally car). the fix on the cosworth then is to drill a small hole in the throttle butterfly. BE CAREFULL if you are going to to do this though. The difference between a 2.7mmm hole and a 3mm hole is a new throttle body.

Guess how we found that out?

If you drill the hole too big you can just solder it up Solder less than 1p, how much for a new TB???

 

CheerZ,

 

Andy