AFR too high what to do about it?
#1
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AFR too high what to do about it?
Issue solved: To keep it simple, when the car was tuned before the fuel pressure was lower than it should have been. When the nut backed off the FPR, I put the FP gauge on the rail and set it to 43.5. Because the maps were written for a lower pressure when I reset the FP the maps had changed, if you will. Retuned the car at the right fuel pressure and it's all as good as new.
For all you tuning guys I have question for you.
Background and mods
Problem:
Basically, I just installed an AEM AFR and I am concerned about the readings. It ideals rich, but it's not that bad, somewhere between 14.5 and 13. But under WOT it is just dumping gas in it. It will be around 11:1 starting at 4 PRM and then once it reaches 6k it goes below 10:1. Basically, what is causing the injectors to dump so much fuel. I understand that it would be the tune, but I would like to have faith in their skills the AFR would be better than that. So what else can I be looking for that would cause the ECU to pump so much gas in at those high RPM's. Thanks for the input and +rep for helpful information.
For all you tuning guys I have question for you.
Background and mods
- B20
- all the bolts-ons
- 11:1 CR
- crower 403's and springs
- AEM fuel rail and FPR
- RC 370 CC injectors
- OEM Fuel pump
- P28 tuned on Neptune
Problem:
Basically, I just installed an AEM AFR and I am concerned about the readings. It ideals rich, but it's not that bad, somewhere between 14.5 and 13. But under WOT it is just dumping gas in it. It will be around 11:1 starting at 4 PRM and then once it reaches 6k it goes below 10:1. Basically, what is causing the injectors to dump so much fuel. I understand that it would be the tune, but I would like to have faith in their skills the AFR would be better than that. So what else can I be looking for that would cause the ECU to pump so much gas in at those high RPM's. Thanks for the input and +rep for helpful information.
Last edited by jhholloway; 09-25-2011 at 06:41 PM.
#7
Re: AFR too high what to do about it?
Basically, I just installed an AEM AFR and I am concerned about the readings. It ideals rich, but it's not that bad, somewhere between 14.5 and 13. But under WOT it is just dumping gas in it. It will be around 11:1 starting at 4 PRM and then once it reaches 6k it goes below 10:1. Basically, what is causing the injectors to dump so much fuel. I understand that it would be the tune, but I would like to have faith in their skills the AFR would be better than that. So what else can I be looking for that would cause the ECU to pump so much gas in at those high RPM's. Thanks for the input and +rep for helpful information.
First, talk to your tuner. Have him do some baseline pulls on the dyno with HIS a/f meter, and compare. If the tune is off, get it retuned. If you don't feel comfortable going back to him, find someone else who's reputable.
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Re: AFR too high what to do about it?
OK half of y'all are dumber than I am, I understand that the easy cop out answer is the tune. But with computers there is little variance over a couple months. The maps shouldn't change, if everything was done right. After I got it tuned it drove perfect, NO complaints. Now after a couple months throttle response under 2k has a terrible delay. There have been no mods or tinkering, since the tune... So logically there should be another culprit for the lack of acceleration.
That's what provoked the purchase of a A/F gauge. Now that I have it I noticed the low ratio; I needed to know if some else know if there is something else that might cause a motor to run rich.. like if the intake sensor was messing up telling the car that more was coming than what was in reality.
That's what provoked the purchase of a A/F gauge. Now that I have it I noticed the low ratio; I needed to know if some else know if there is something else that might cause a motor to run rich.. like if the intake sensor was messing up telling the car that more was coming than what was in reality.
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Re: AFR too high what to do about it?
You need a better tune. You probably got it tuned when the weather was different, like not as hot or whatever. Now because the tune is incomplete, the ECU isn't compensating correctly for the higher temperatures, etc.
Just for giggles, reset the ECU and see what happens.
Just for giggles, reset the ECU and see what happens.
#10
Re: AFR too high what to do about it?
resetting the ecu sint going to do anything, the tune wil still be burned to his chip. What month did you get the car tuned? like others have said the hotter weather will cause you to get less air and thus run rich. If you want i can lean it out for you, i have the tuning software, and ill be in mechanicsville tomorrow. but only tomorrow.