Microtech Area is for discussing Microtech systems

Microtech idle AFR for emissions?

Old 08-22-06, 09:57 AM
  #1  
Senior Member
10 Year Member
Thread Starter
 
turbo80cid's Avatar
 
Join Date: Jun 2004
Location: Houston
Posts: 655
Likes: 0
Received 0 Likes on 0 Posts
idle AFR for emissions?

Iím tuning my LT-8 for emission testing but I canít seem to get the idle AFR leaner than 13.5. I have not touched the factory timing settings yet but I was wondering if I could run more advanced at idle and then lean out the AFR closer to 14.7? Iíve only done a rough tune in the NORMAL mode and now I plan to switch over to MATRIX mode.

Also Iím leaning out just before 3000rpmís. I think I need to up my %stage from 50% to 65%.....will that help or should I just tune that out in the MATRIX mode?

Engine specs:
Stock S5 engine (stock ports)
Stock turbo & intercooler
Stock 550 primary injectors
720 secondary injectors
Idle fuel pressure 38psi

-Bill
turbo80cid is offline  
Old 08-22-06, 04:01 PM
  #2  
*BOV sound*
iTrader: (16)
 
Radial GT's Avatar
 
Join Date: Feb 2001
Location: Northern Minnesota
Posts: 1,156
Likes: 0
Received 0 Likes on 0 Posts
Run an airpump into your exhaust. Run the gas tank low and put a couple bottles of rubbing alcohol in there. And a cat.. or 2. It was TOUGH getting mine to pass. Oh and make sure your out giving it one hell of a good run before you get there to have the turbo cook'n.
Radial GT is offline  
Old 09-07-06, 04:59 PM
  #3  
Sharp Claws
iTrader: (30)
 
RotaryEvolution's Avatar
 
Join Date: Oct 2003
Location: Central Florida
Posts: 5,135
Likes: 0
Received 16 Likes on 15 Posts
rotaries do not like to idle under 12.6AFR, you are misunderstanding stochiometric values, those are based mainly on piston engines and for cruising light load applications.

with a good catalytic converter and airpump blowing on it then toss AFR values out the window, lean it out til it just starts to want to hunt/misfire/die at idle then richen it up a tad and that should be good for emissions testing basis.
RotaryEvolution is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
R.O.D
2nd Generation Specific (1986-1992)
34
01-06-16 12:09 AM
stickmantijuana
Microtech
6
11-21-15 10:20 AM
qqqqball
3rd Generation Specific (1993-2002)
11
10-09-15 07:06 PM
R.O.D
Rtek Forum
1
09-23-15 01:15 AM
RotaryBobby
1st Generation Specific (1979-1985)
1
09-10-15 01:33 PM


Thread Tools
Search this Thread
Quick Reply: Microtech idle AFR for emissions?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: