Lean A/F issue stock?
Lean A/F issue stock? Hi, I recently dynoed my 00 z28 6 spd 59k miles with the only mods being the free ones like the egr being cut, airbox cut, k&n air filter, and the maf being descreened. Unfortunatly afr was 14.5:1 throughout the whole rpm range but the dyno guy stopped the run at 5kish because of the lean issue. I did put 93 in it. Car only made a dissapointing 280whp and 296 wtq. I wouldn't think a car with only these mods would be running that lean from the factory. I did notice that whoever oiled the k&n air filter put a little too much oil on it. Any ideas/ anyone that's had this problem?
FormerVendor
Joined: Dec 2001
Posts: 2,444
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From: WWW.SPEEDINC.COM
Most likely a dirty or malfunctioning MAF sensor. Clean the sensor and run it on the dyno again while monitoring airflow values.
1lb/min = approx 10hp so a 300rwhp car should be around 30-31lb/min peak maf airflow with a correspondingly correct a/f ratio.
When you see a 300rwhp car with a maf registering 19lb/min and running 14-1++ a/f ratio the maf sensor is definitely a problem.
1lb/min = approx 10hp so a 300rwhp car should be around 30-31lb/min peak maf airflow with a correspondingly correct a/f ratio.
When you see a 300rwhp car with a maf registering 19lb/min and running 14-1++ a/f ratio the maf sensor is definitely a problem.
Most likely a dirty or malfunctioning MAF sensor. Clean the sensor and run it on the dyno again while monitoring airflow values.
1lb/min = approx 10hp so a 300rwhp car should be around 30-31lb/min peak maf airflow with a correspondingly correct a/f ratio.
When you see a 300rwhp car with a maf registering 19lb/min and running 14-1++ a/f ratio the maf sensor is definitely a problem.
1lb/min = approx 10hp so a 300rwhp car should be around 30-31lb/min peak maf airflow with a correspondingly correct a/f ratio.
When you see a 300rwhp car with a maf registering 19lb/min and running 14-1++ a/f ratio the maf sensor is definitely a problem.
