<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AMS MIKE &raquo;</TD></TR><TR><TD CLASS="quote">Usually you will pass at 25mph, Thats the easy part. Its passing at 15mph that is the harder part.

Here is the easy fix to lower NOX...

1.) car sound cat #93501 (its a large cat, more meat inside the cat less NOX)
2.) 87 octane gas
3.) make sure the car is WARM before you do the 15mph test

Easy as that. I have been doing this for a long time for customers getting their cars BAR'd

-Mike</TD></TR></TABLE>

I can't find anyone that has a #93501 Car Sound Cat. . . does it even exist? Are you sure thats the correct number? Its not even listed on the Car Sound Website.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hapa88 &raquo;</TD></TR><TR><TD CLASS="quote">

I can't find anyone that has a #93501 Car Sound Cat. . . does it even exist? Are you sure thats the correct number? Its not even listed on the Car Sound Website.</TD></TR></TABLE>

won't pass don't even try

 

WTF? I reffed and passed with my carsound.

OBD1 GS-R BTW.

 

lol

ur luckly motor passed his motor won't

I know personally 7 people tired to pass same **** on all our motors cant pass nox at 15mph. we all have gsr, b16a, and type r. One dude had a LS he passed with flying colors with his usdm LS in a 92.

edit: **** load of people here on honda tech can't pass nox search and you shell find. some people have passed with two cats hehe

its not worth IMO.

 

then there is something else wrong with your motor...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b cruz. &raquo;</TD></TR><TR><TD CLASS="quote">then there is something else wrong with your motor...</TD></TR></TABLE>

umm I guess if yours pass everyone else should pass

 

yeah if the motor is in good running order and the wiring/vac lines are all hooked up correctly. It doesn't take magic to get a dohc vtec motor running like how it should be from the donor car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b cruz. &raquo;</TD></TR><TR><TD CLASS="quote">yeah if the motor is in good running order and the wiring/vac lines are all hooked up correctly. It doesn't take magic to get a dohc vtec motor running like how it should be from the donor car. </TD></TR></TABLE>

I agree I had my car smogged the other day at a smog test only station. my nox numbers were high almost borderline but I passed the test. the guy(smog tech) is cool and told me the reason my nox is so high is because the cat isn't warm enough, that's typical of aftermarket cat he said. if I would've ran the hell out of the car to redline I think I definitly would be much lower in the nox. here's my results:


NO(PPM)

max ave meas

716 150 703 ( 15 mph ) Pass

764 136 246 ( 25 mph ) Pass

 

Car Sound/Magnaflow changed the part #'s. I have them all memorized and its different now...

2".............93504
2.25"........93505
2.50"........93506
3".............93509

I sell them all. The more meat in the cat (obd2 cats) the lower your NOX

 

I've got an idea that somebody should try.

If the problem is related to the cat not getting hot enough, you could put a "restrictor" gasket just after the cat. By doing this, it would cause heat to build up in this area.

Once you get through the smog check, you could then remove the restrictor.

Of course, this isn't really legal.

There is also this idea; contrary to simple logic, it may be better to use a smaller cat. The reason is that the restriction would cause it to get hotter.

It sure would be funny to find out that all it takes is a metal restrictor!!!

Wes

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wes V &raquo;</TD></TR><TR><TD CLASS="quote">There is also this idea; contrary to simple logic, it may be better to use a smaller cat. The reason is that the restriction would cause it to get hotter.
</TD></TR></TABLE>

I had a smaller and it would get hot enough but would not lower the Nox enough. so I got the larger cat and it passed with flying colors.

Both the smaller and larger cat were brand new from Car Sound!

 

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

I had a smaller and it would get hot enough but would not lower the Nox enough. so I got the larger cat and it passed with flying colors.

Both the smaller and larger cat were brand new from Car Sound!</TD></TR></TABLE>

What size do you recommend for my application? 2.25"? 2.5"?

 

which ever pipe size you are running, match it

 

The oxygen sensor could be a problem. You might want to replace it before going for a retest. This could especially be the case if you know nothing about the complete history of the sensor itself. I should note that MMT-containing octane boosters destroy oxygen sensors. Even if they say they don't. So if you (or anyone else) has ever used such an octane booster, this could have destroyed your sensor.

There is another little trick that can reduce NOx numbers. And that is to dump one gallon of denatured alcohol into a (fairly) empty tank and fill the rest with gas. Have the car tested with the alcohol mix in the tank. Alcohol has a strong charge-cooling effect and reduces the formation of NOx.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AMS MIKE &raquo;</TD></TR><TR><TD CLASS="quote">which ever pipe size you are running, match it</TD></TR></TABLE>

I have a RS-R exhaust that has 60mm piping (or 2.36") so should I get the 2.5"?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hapa88 &raquo;</TD></TR><TR><TD CLASS="quote">

I have a RS-R exhaust that has 60mm piping (or 2.36") so should I get the 2.5"?</TD></TR></TABLE>

2" will be fine, 2 1/4" will work too except you will need to customize the front end of the cat to fit the header due to it's 2" size (this is stock manifold I'm talking about)

 

hey I just finished a B18B swap in a 1992 CX and it passed the ref on its first try yesterday

MAGIC... pure MAGIC!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b cruz. &raquo;</TD></TR><TR><TD CLASS="quote">hey I just finished a B18B swap in a 1992 CX and it passed the ref on its first try yesterday

MAGIC... pure MAGIC!</TD></TR></TABLE>

haha LS try that with a B16a
lot of things cause high nox compression ratio has a lot to do with it.
the lower the compression the better chance you have to pass.
you can try to change your o2 try change your cat try to change your fuel but I don't think these will help you pass. your try alchol might lower nox how about ur HC might go high

 

I would but it doesn't have enough torque for me...

I have tried it with other B18c's and C1's...

 

doesn't hurt to try try everything if it helps let me know I will do the same hopefully we have a solution soon

 

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

There is another little trick that can reduce NOx numbers. And that is to dump one gallon of denatured alcohol into a (fairly) empty tank and fill the rest with gas. Have the car tested with the alcohol mix in the tank. Alcohol has a strong charge-cooling effect and reduces the formation of NOx.</TD></TR></TABLE>

wow that is interesting. are there any side effects to doing this?

 

little sause for you guys whats wrong

is it my spark plugs, my fuel filter, my 02 sensor, my cat, ecu, my coolant, my gas octane, my car is a pos because I tired 7 times and still failed?? what can it be guys someone has to know

maybe I should go buy a 700 dollar cat like magic my car will pass

maybe I need to run 120octane maybe put 5 cats and try to pass maybe run on pure alchol maybe put 5 02sensor so my car passes maybe throw it off the cliff its just maybe cause my compression is to high maybe just maybe

 

WEll IM for that head should be fine becaus you can just say it's a skunk2 IM and I'm sure those are CARB certified.

 

***UPDATE*** - Oct. 25, 2004 *********
Just got back from the State Ref Center. I passed and am now BAR Certified in the State of California with a JDM B18C. Since the first time I failed, I brought it to a Smog Center they ran all the tests and determined that all I needed was a new CAT. Got a new 2.25" Carsound CAT installed and they adjusted the timing to 13 BTDC, Pre-tested and it passed. The Smog Center also determined that my car doesn't even need the EVAP Purge Valve, which they installed and then took back off! The called the Referee and he OK'ed it.

So I drove it 1000 miles out to Arizona and back to visit the GF. While I was there, picked up another bottle of G2P fuel treatment. Ran it through a tank and dropped in the usual 91 Octane gas and went to the Referee Center. Only thing they noticed was I was 1 quart low on Oil.

Anyway here are the results for reference:


MAX value | Measured Value (last time) | Measured Value (w/ New CAT and 13 DBTDC)

15mph (test done in 2nd gear)
engine RPM = 2018 | 1933
CO2 = 14.3% | 14.8%
O2 = 0.3% | 0.0%
HC = 89 | 155 | 72
CO = .53 | .55 | .14
NO = 708 | 1686 | 420

25mph (test done in 3rd gear)
engine RPM = 2307 | 2240
CO2 = 14.7% | 14.8%
O2 = 0.0% | 0.0%
HC = 54 | 43 | 36
CO = .51 | .12 | .06
NO = 746 | 198 | 151


Just wanted to thank everyone for their help. Glad to know I have people like you guys around to help out.

 

MAJOR CONGRATULATIONS!!


Now we need to start a club of individuals that have legal B18c's

Wes