Go Back   Honda-Tech > Honda and Acura Model-Specific Technical Forums > Acura Integra Type-R
Sign in using an external account
Register Forgot Password?
Search


Welcome to Honda-Tech!
Welcome to Honda-Tech.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Honda-Tech community today!


Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread
Old 06-02-2002, 12:35 PM   #1
Honda-Tech Member
Garage is empty, add now
 
Cosworth's Avatar
 
Join Date: May 2001
Location: Fairbanks
Posts: 6,401
iTrader Rating: (0)
Default Emission Q: Tricks to reduce NOx counts ?

What's the trick to redue NOx counts during an emission test?

I know that for HC counts, you retard the ignition timing... but what about NOx counts?

How much do I need to retard the timing to considerably reduce the NOx counts? Is 2 deg enough to knock down 1000 ppm of NOx?


[Modified by Cosworth, 8:19 PM 6/2/2002]
__________________
For Sale:
1. '98 CW USDM OEM hood: $125
Cosworth is offline   Reply With Quote
Old 06-02-2002, 01:16 PM   #2
Honda-Tech Member
Garage is empty, add now
 
Brian*'s Avatar
 
Join Date: Dec 2001
Location: Colorado Springs, CO
Posts: 6,934
iTrader Rating: (0)
Send a message via AIM to Brian*
Default Re: Emission Q: Tricks to reduce NOx counts ? (Cosworth)

more fuel helps reduce NOx, thats what helped me pass emissions (1200ppm down to 192ppm)

Brian
__________________
'12 GLI 6M
Brian* is offline   Reply With Quote
Old 06-02-2002, 02:31 PM   #3
Honda-Tech Member
Garage is empty, add now
 
Cosworth's Avatar
 
Join Date: May 2001
Location: Fairbanks
Posts: 6,401
iTrader Rating: (0)
Default Re: Emission Q: Tricks to reduce NOx counts ? (zyg)

Timing was at 16... I set it to 18 now. Should I go higher? I don't have a fuel pressure regulator to increase the fuel manually. Click the image to open in full size.
Cosworth is offline   Reply With Quote
Old 06-02-2002, 02:40 PM   #4
Honda-Tech Member
1995 Acura Integra
 
non-VTEC's Avatar
 
Join Date: Jan 2000
Location: Toronto, Canada
Posts: 6,211
iTrader Rating: (0)
Default Re: Emission Q: Tricks to reduce NOx counts ? (Cosworth)

retarding the timing will reduce HC and NOx.............. Click the image to open in full size.
__________________
95 Integra Turbo - SOLD
2014 Toyota Corolla S
non-VTEC is offline   Reply With Quote
Old 06-02-2002, 03:30 PM   #5
Honda-Tech Member
Garage is empty, add now
 
Cosworth's Avatar
 
Join Date: May 2001
Location: Fairbanks
Posts: 6,401
iTrader Rating: (0)
Default Re: Emission Q: Tricks to reduce NOx counts ? (non-VTEC)

fug, I think I have it all mixed up. Correct me if I'm wrong.

1. Retard -> rotate the distributor away from the firewall
2. Advance -> rotate the distributor towards the firewall

Also, when I check the timing w/ a timing gun there are 3 lines on the belt. The middle one is red. So, if I retard the timing which line should the pointer be lining up with? The line left (towards the fender) or the line on the right (towards the firewall)?

__ firewall
__ red (driver side fender)
__ fender


[Modified by Cosworth, 8:19 PM 6/2/2002]
Cosworth is offline   Reply With Quote
Old 06-02-2002, 06:23 PM   #6
Honda-Tech Member
Garage is empty, add now
 
Cosworth's Avatar
 
Join Date: May 2001
Location: Fairbanks
Posts: 6,401
iTrader Rating: (0)
Default Re: Emission Q: Tricks to reduce NOx counts ? (Cosworth)

hmmm
Cosworth is offline   Reply With Quote
Old 06-03-2002, 02:59 PM   #7
Honda-Tech Member
Garage is empty, add now
 
RagingAngel's Avatar
 
Join Date: May 2000
Location: The Dirty Hotness
Posts: 4,065
iTrader Rating: (0)
Send a message via MSN to RagingAngel
Default Re: Emission Q: Tricks to reduce NOx counts ? (zyg)

I dunno what your "aircare" stations are like...

but for me when I go and test my car, I keep my foot on the gas and rev it to about 1500rpm and that really puts some heat into the cat.

Apparently it works better when really hot. Maybe it'll work for you.

FWIW, my car which is "vintage" 97 tested cleaner now than it did a few years back with this "trick"

Click the image to open in full size.
RagingAngel is offline   Reply With Quote
Old 06-03-2002, 03:09 PM   #8
Honda-Tech Member
Garage is empty, add now
 
reefer_bob's Avatar
 
Join Date: Jul 2001
Location: NorCal, USA
Posts: 1,541
iTrader Rating: (0)
Default Re: Emission Q: Tricks to reduce NOx counts ? (RagingAngel)

Yes, you must make sure that your cat is nice and hot! A cool cat does no good.

I've had hig NOX on my '95 Civic. The place that I took it recommend a full fuel system clean, including the combustion chambers. Apparently the carbon will build up in there, and somehow that will cause higher NOX levels. They did it, (It was expensive, like $90, some big machine by Snap-On), and it cut the NOX levels drastically. It allowed my car to pass!!! FYI... Click the image to open in full size.
__________________
'01.5 Audi S4
'95 Civic EX Coupe
'09 TSX 6-Spd.
reefer_bob is offline   Reply With Quote
 
 
 
submit to reddit
Reply

Tags
1995, car, civic, emission, emissions, honda, lx, nox, pass, reduce, reducing, retard, test, timing, tricks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 09:39 PM.



2008 Copyright, InternetBrands Inc.
Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for Honda-Tech.com content, comments, or advertising. Honda-Tech.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse Honda-Tech.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.
Emails & Contact Details