AIR System questions? - ZR-1 Net Registry Forums

Ozruss90 · 03-07-2024

Went to replace the T piece that joins the left and right side hoses from the exhaust manifolds to the Electric divert valve. Thought I would check to see if the check valves were operating correctly as per FSM. Started the car up, minus the T piece, and both left and right sides are positive pressure to exhaust. My interpretation is that they are a one way valve for fresh air to be pumped in. Not allow exhaust to be pushed out. Has Watson headers on it.
Is it an emission system that needs to be working ? or can I bypass it ?

Cheers, Russell. 🇦🇺
1990. #2774

WARP TEN · 03-08-2024

I don't know the answer to that Russell but I bet Marc Haibeck would be glad to answer that for you is you shoot him an email. I would bet he has dealt with many AIR systems over his years. Although I am sure others might have an idea for you. --Bob

grahambehan · 03-08-2024

The purpose of Air injection is to speed up catalyst light off ie get them up to working temperature. Since you have watson headers, do you have cats? When we designed these headers the retention of the air check valves was to keep the systems on the car functional and pass a cursory vusual inspection. If you do not have cats air injection is unnecessary.
Graham

Ozruss90 · 03-08-2024

Quote:

Originally Posted by grahambehan

The purpose of Air injection is to speed up catalyst light off ie get them up to working temperature. Since you have watson headers, do you have cats? When we designed these headers the retention of the air check valves was to keep the systems on the car functional and pass a cursory vusual inspection. If you do not have cats air injection is unnecessary.
Graham

It appears to have cats on the Borla system that is on it. I don?t need to pass any emission tests for ongoing registration. So given that it is pushing exhaust past the check valves on both sides, can I just block them off.

03-07-2024	#1
Ozruss90 Join Date: Oct 2016 Location: Shepparton. Vic. Australia Posts: 135	AIR System questions? Went to replace the T piece that joins the left and right side hoses from the exhaust manifolds to the Electric divert valve. Thought I would check to see if the check valves were operating correctly as per FSM. Started the car up, minus the T piece, and both left and right sides are positive pressure to exhaust. My interpretation is that they are a one way valve for fresh air to be pumped in. Not allow exhaust to be pushed out. Has Watson headers on it. Is it an emission system that needs to be working ? or can I bypass it ? Cheers, Russell. 🇦🇺 1990. #2774

03-08-2024	#3
grahambehan Join Date: Feb 2013 Location: New Concord Kentucky Posts: 179	Re: AIR System questions? The purpose of Air injection is to speed up catalyst light off ie get them up to working temperature. Since you have watson headers, do you have cats? When we designed these headers the retention of the air check valves was to keep the systems on the car functional and pass a cursory vusual inspection. If you do not have cats air injection is unnecessary. Graham Last edited by grahambehan; 03-08-2024 at 01:07 PM.

03-08-2024	#2
WARP TEN Join Date: Apr 2007 Location: Lake Bluff, IL Posts: 2,035	Re: AIR System questions? I don't know the answer to that Russell but I bet Marc Haibeck would be glad to answer that for you is you shoot him an email. I would bet he has dealt with many AIR systems over his years. Although I am sure others might have an idea for you. --Bob __________________ 2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough"