How to check AFR using Predator

[amm]

Hi .. How can I check my Air/Fuel by using the U7151 Predator (wideband) ?

With so many thanks!

[dallasmustang]

The Predator has no analog inputs to do that. You will need to purchase a wideband Air/Fuel meter to read that or take it to a dyno that uses a wideband.

[amm]

Already I toke my truck to a dyno and my Air/Fuel was around 17 ! (unexpected #) .. my upgrades as shown below:

-K&N 77 SERIES COLD AIR INTAKE KIT.
-JBA SHORTY HEADERS.
-SPLIT REAR EXIT BORLA EXHAUST SYSTEM.
-NO CATS, REPLACED WITH TWO MUFFLERS.

What is your opinion, is it possible that my after market parts is leaning my car that much?

thanks alot!

[dallasmustang]

Where were they measuring air/fuel? In the tailpipe or before the convertors?

[amm]

I'm not sure .. But after that I raise the MAF Curve to + 26% and the result was around 12.5 (Air/Fuel). And what surprise me that the HP was raised up to 30 hp (on dynojet screen). But when I drive the car I don't feel that much performance, the acceleration become sluggish and the mufflers voice are very loudly and noisy, also the truck isn't shift smoothly!

Those things made me doubt on the dynojet result, is it accurate or not?

Any help will be appreciated and thanks alot for responding!

[amm]

?

[dallasmustang]

Sounds like you do need a custom tune especially if you had to add that much fuel.

[amm]

Is it possible that my after market parts is leaning my truck that much ??

Also I don't know if they were measuring the AFR from the tailpipe or after the converter, Please I hope that you can explain the difference between them on the AFR result?

thanks alot!

[svt93]

Sounds like you have a dirty or faulty MAF sensor. The oil in after market filters some times collects and builds debris on the sensor wires. Try inspecting and cleaning MAF. Your mods should not lean it out that much. Hope this helps.

Paul
Modern Muscle Motorsports

[amm]

Thanks a lot .. I'll try cleaning the MAF Sensor

[amm]

What about the shorty headers .. if there is a leak --> is it effecting the Air/Fuel that much ?

Thanks alot!

[mikel]

Yes, a leak will cause lean issues often times as well.

[amm]

I'll return the stock headers back and see what will hapen !

Thanks alot!