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Username Post: Header help        (Topic#367610)
1983G20Van 
Super Senior Member
Posts: 3970

Loc: Hurst, Texas, USA
Reg: 11-13-02
03-17-22 05:04 PM - Post#2838286    
    In response to 1983G20Van

This was the 97 van post thorley headers. Shifting at 4,800 rpm it still had good get up and go for a 4L85E and 3.73 gears. 2,000 rpm @65 mph up 6% grades in overdrive. I made a 2,200 mile road trip after the headers and averaged better than 19 mpg on every tank except one. I ran 90+ MPH for several hours on I-40 across TN outrunning a storm and still got over 17 on that tank.

https://youtu.be/-6DZhPN7VHQ

https://youtu.be/UgwvwHzk74c

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 03-17-22 05:07 PM. Reason for edit: No reason given.

 
Tony1963 
Frequent Contributor
Posts: 1664

Loc: Orlando Florida
Reg: 07-09-18
03-18-22 09:12 AM - Post#2838312    
    In response to 1983G20Van

I'd be interested in your impression of the percent gains in horsepower and torque. Sounds impressive thus far.

People fear change because it threatens what they know, or what they claim to know.


 
1983G20Van 
Super Senior Member
Posts: 3970

Loc: Hurst, Texas, USA
Reg: 11-13-02
03-19-22 05:34 PM - Post#2838397    
    In response to Tony1963

  • Tony1963 Said:
I'd be interested in your impression of the percent gains in horsepower and torque. Sounds impressive thus far.



Probably 8-10%. Was pulling 8-10% more air through the MAF at peak everywhere. Biggest airflow gains were in the 2,000-4,500 rpm range.

Been driving around the Pathfinder all week after the shorty header swap, it too has noticeably more acceleration at light throttle. Its definately more responsive everywhere. I notice it even at light throttle keeping up with traffic from a stop. I can keep pace with traffic with less throttle and the transmission upshifts earlier as a result. More torque = less throttle = less rpm = more mpg. No retune needed on the Pathfinder, just cleared the adaptive learning and let the ECU relearn the new airflow. Its MAF based with factory wideband 02s. I actually easily broke the tires loose this morning at half throttle. Individual tubes into a collector greatly help exhaust scavenging compared to a log manifold. Alot of my commute is between 30 and 55 mph. I find it staying in overdrive alot more even climbing grades and lightly accelerating. Before it took more throttle to hold the same speed and a slight increase in throttle forced it to kickdown a gear. Now using less throttle to maintain speed, it responds to light throttle changes with more torque rather than a downshift to get more torque.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 03-19-22 05:49 PM. Reason for edit: No reason given.

 
Fleetline49North 
"2nd Year" Gold Supporting Member
Posts: 5
Fleetline49North
Age: 65
Loc: Hyas Sask Canada
Reg: 12-25-20
09-20-22 12:44 PM - Post#2847581    
    In response to Tony1963

You might be right at the loose 20 lbs if u dump the stock exhaust manifolds . Also find they run much cooler on mine.



 
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