Since more air is being rushed in and there is more room for intake air since more exhaust gasses wil be escaping because of the headers. If so is an AFPR in order? Do you think it should on my sig below. I just had headers put on and haven't noticed as much of a difference. The ramair and pulleys seemed to be a bigger increase but everyone talks that headers are one of the best mods...

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88 GTA 350 TPI A4, Digital Dash, Black/Tan T-Tops, 39,000 original miles. WS6 suspension. 9Bolt 3.27s.

MAC Catback, Airfoil, K&N, Transgo Performance Shift kit, Rerouted tranny bypass switch to OD. 160 stat with new fan switch, rerouted coolant lines, relocated air temp sensor out of intake, hi flow water pump, homemade cold/ram air, hypertech crank pulley, Hooker 50 state legal Super Comp Headers

 

it can, id suggest getting an apfr or making one yourself (vader has an article on how to do it)
once you get it, the best thing i can tell you is to play with it at the track and see what it runs best at

 

Not really. The factory WOT fuel enrichment is ungodly fat, something like 11.5:1. By promoting more airflow and leaving the FP the same, you're leaning out the A/F ratio to maybe around 12.5:1 tops, which is definetly more ideal. The factory uses such a rich WOT fuel map because it has to account for bad gas, altitude, temp extremes, etc. If you plan on more mods, get the AFPR, but if it were my car I'd leave it alone til you do a little more.

BTW, with a stock chip I'd ditch that 160 stat for a 180. I know it will go into closed loop with the 160, but the BLM will not modify until the CTS sees 176.
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-Jason M. 1991 Camaro Z28
"Allow me to introduce myself my name is Mud."

[This message has been edited by Jason M 91Z (edited October 07, 2000).]

 

Jason,

Good points. I see you've been doing your homework. You've outlined the reason I have a 180° stat in my car. As you probably are aware, there are a few more subtle changes that occur at the 176°F threshold as well, and a 160° stat just doesn't satisfy the CTS all the time.

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JGR,

A ram-air would likely make a notable difference on a speed-density system, but is less likely to affect a MAF car. Regardless of the static pressure at the air filter box, the MAF still measures all incoming air. If you are operating on the lean side, there is likely a different reason. If the oxygen sensor is indicating lean, you might want to make sure the sensor is correct. O2 sensor performance degrades over time, and the default failure mode seems to be toward the low signal (lean exhaust) end of the range. If the sensor indicated lean and is more than 30,000 miles old, verify the readings with a sniffer or replace the sensor before getting too involved in troubleshooting a problem that might not actually exist.

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

Thanks Vader, so I passed the test? I think I picked up the 176* threshold from one of your posts that outlined all ECM fuctions based on coolant temperature. A student can't do his homework without having a good teacher!

EDIT: Anyone got a tissue? My nose is all brown!
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-Jason M. 1991 Camaro Z28
"Allow me to introduce myself my name is Mud."

[This message has been edited by Jason M 91Z (edited October 07, 2000).]