In Indiana we do not have emissions testing, and most of my friends have removed the EGR system on their cars.

I have a 96 T-5 wagon for reference.

How would the removal of the EGR system effect the car's performance? Has it been done successfully?


I would have to use a resistor to trick the EGR system into thinking all systems were go so I didn't get a CEL.

 

Just get a 96 ECU without EGR. Then remove all your parts and call it done.

 

Anyone one have any Dyno proof that this actually does anything?

 

I am not sure. But this is how I feel about it.
Less parts on the car less to do wrong. EGR cars have the systems get plugged alot and cause running problems.

My chipped ECU is from a 96 Non-EGR and Non-Air pump.

 

True. Less to worry about is always a good thing....

 

i am a fan of de-bugering cars. if it doesnt NEED it to run, get rid of it.

 

EGR is exhaust gas recirculation. It takes some exhaust gas from the exhaust manifold and draws it into the intake manifold, but only during certain conditions; typically at steady-state cruise situations. The EGR valve is just a high temp air valve that either allows exhaust gas into the intake manifold, or not. It is controlled by vacuum, which is controlled by a vacuum valve, which is controlled electronically.

So why is it there? It lowers NOx emissions by lowering combustion temperatures. But does it rob pwr? Most certainly; it dilutes the air/fuel mixture with hot HC laden gas.

The trick I've seen (haven't tried as yet) on other vehicles is to put a solid gasket (no hole in it) between the EGR valve and the intake manifold. The EGR will still open/operate normally, but it just won't allow the exhaust gas into the intake manifold. The beauty is it looks perfectly stock. Anyone tried this?

 

on all my other cars i have CNC'ed a plate for it... havnt yet for the volvo.

 

I know what an EGR does, I just wasn't sure about this car specifically (ie: if someone has done it)



Now, in reference to the ECU. I have a 1996. My car does not have an Air pump.

Is there a non-EGR car model?

 

Oh, I have done this to other cars before.

I know how to, but I was really interested in the effects on a turbo engine.


Sometime this year I'll be getting the OBX exhaust for the car which will open it up a lot.

 

Yes there is my wifes is a 96 without EGR. The computers should be pretty easy to find as well.

 

check around swedespeed or vovlospeeds forsale section.
I think I have seen a tuned ECU over at turbobricks

 

All in all....if there is nothing wrong with the EGR system (no check engine light), I will not touch anything becuase the difference it makes is not even noticeable in normal driving.

 

normal driving is true, but if you want a weekend racer, or a fun around town daily it can be nice to say screw emissions and debugger it.

 

Well EGR doesnt kick-in untill you reach that stable higher speeds with less loads. For city driving and as you mentioned 'fun around town', there will be no difference as the EGR will not even openduring those short time ramps.