Jet change needed for duals
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,078
Likes: 283
From: Dyersburg TN
Jet change needed for duals
my 1981 is stock except for a high flow air cleaner and dual exhaust with glass pack mufflers. I get backfire in pipes during deceleration that I beleive is due to a lean condition.
how can I know what jet changes to make to balance the system?
how can I know what jet changes to make to balance the system?
Instructor
Joined: Sep 2007
Posts: 198
Likes: 0
From: Colorado Springs Colorado
I'd first make sure you don't have any vacuum leaks.. The computer should be able to adjust for the headers. Make sure the header gaskets aren't leaking, and check or replace your 02 sensor. Hope this helps, and let us know after you check these out.
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,078
Likes: 283
From: Dyersburg TN
Not sure that gen computer can adjust that much. As i understand it controls only idle air mixture and timing advance. I have checked for exhaust leak and find none.
Le Mans Master
Joined: Oct 2010
Posts: 6,938
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
tail pipe poping is somewhat normal with glasspacks. rejeting could be necessary a free flowing exhaust will affect the a/f ratio. many times when people put headers on a car the performance doesn't improve until the air fuel mixture is corrected
Instructor
Joined: Sep 2007
Posts: 198
Likes: 0
From: Colorado Springs Colorado
dburgjohn,
Have you visited the '81 vette forum? http://www.corvetteactioncenter.com/...earchid=196249
They have alot of info about the '81 computer system. I just typed in header, computer in their search box and alot of info comes up.
Have you visited the '81 vette forum? http://www.corvetteactioncenter.com/...earchid=196249
They have alot of info about the '81 computer system. I just typed in header, computer in their search box and alot of info comes up.
