i have a 97 gsr which i need to have emission test done to...

the car has dc headers to a test pipe to an apexi exhaust...

to pass emissions i need to have the cat and o2 sensor hooked up...

would a stock catalytic converter still be able to be mounted between the dc headers and apexi exhaust? or would it not work

even with slight modification?

thanks in advance for any help

 

Unless the DC header has a JDM outlet flange, it should bolt right in.

 

You will need a fully-functional EGR system to pass the emissions test, also; not just cat and O2.

I was wondering, do you always run your car without the O2 sensor?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Insert Marijuana Here &raquo;</TD></TR><TR><TD CLASS="quote">You will need a fully-functional EGR system to pass the emissions test, also; not just cat and O2.

I was wondering, do you always run your car without the O2 sensor?</TD></TR></TABLE>

Integras have never had an EGR system. The O2 sensor to which the OP was referring was the secondary sensor required for OBDII.

 

How are the NOx gasses eliminated without EGR?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Insert Marijuana Here &raquo;</TD></TR><TR><TD CLASS="quote">How are the NOx gasses eliminated without EGR?</TD></TR></TABLE>

EGR = exhaust gas recirculation

The catalytic converter reacts the NOx, HC, and CO to form H2O, CO2, and N2.

 

The EGR dilutes the fuel charge with inert gas (exhaust) to lower combustion temperatures (below 2500) where NOx gasses are generated. As far as I know, the cat is insufficient for eliminating all of the NOx.

 

There is a balance between HC's and Nox. Nox is created when combustion temps are above 2500 degrees.

If you run lean you would be creating Nox because of the burn would be hot.
Now if you run on the rich side you cool the burn and thus don't create as much Nox.

Timing advance will increase the burn because of igniting the gas before TDC and the burn builds up more pressure before it is released.

Then there is the air pump/air injection valve that gives more oxygen to the cat so it will work better. Like on the older Honda's

Hope this helps.

 

I can't vouch for all Hondas, but none of the new ones have an EGR. No Integra sold in the US has ever had one. The temperature and pressure in the combustion chamber may produce NOx, but the catalytic converter with a stoichiometric mixture will eliminate it.

 

So ignition advance and fuel mixture can be adjusted to eliminate EGR without compromising emissions? Would there be any power benefits? This might be off-topic a bit, but I'm wondering if I could safely remove the EGR from my Geo. It's becoming a pain in the ***.

 

On some motors an egr is needed to reduce the nox. Say a high compression motor. The EGR does(like was said) introduce already burned air back into the manifold to lower the combustion temps.

First thing is the ECU actuates the EGR so the ECU plans for this and adjusts the A/F ratios accordingly. If you just remove the EGR then the ECU will be messed up.

There are some that have used a block off plate but then the ECU needs help. Get where I am going.

Performancewise EGR is bad because not all of the air entering the CC contains 02 which is needed to produce fire.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">Unless the DC header has a JDM outlet flange, it should bolt right in.</TD></TR></TABLE>

sweet dude thanks for the help... im glad to see some other people were helped from this thread too...

now i just have to spend the 200+ for the cat and around 200 for the secondary o2 sensor

 

i just wasnt sure if because the diameter of the piping was different it would affect the way it attaches

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by steveo135 &raquo;</TD></TR><TR><TD CLASS="quote">

sweet dude thanks for the help... im glad to see some other people were helped from this thread too...

now i just have to spend the 200+ for the cat and around 200 for the secondary o2 sensor</TD></TR></TABLE>

The O2 sensor should run about $130.
http://store.summitracing.com/...05381+

Call Summit Racing and ask if it has the harness. It is an NGK sensor. (NGK-24546)