Has anyone found it beneficial to upgrade the MAF Sensor after doing a CAI? As is often the case, stock MAF sensors aren't designed to handle much if any increase in airflow and will miscalculate. Cold air alone increases oxygen and the need for more fuel.
I have no discernible evidence this is the case here. Just curious if anyone else has.
What I have noticed since doing my custom CAI is the loss of vacuum at the intake manifold happens quicker and with less throttle. This is a sign of increased power and is evident by the fact my vacuum pump kicks in more frequently and with less throttle. A good sign that my CAI is a definite improvement to the stock airbox which is no great surprise.
I'm just not sure if the MAF sensor is holding it back any as is often the case with stock sensors designed for the stock air intake/airbox. They just aren't calibrated to handle much if any increase.
Pro M makes a drop in MAF for the Jag as well a filter with it's own built in MAF but short of being able to tune it, you give them your info such as injector size, intake tube size, etc. and they program it accordingly. It comes with a 9 point transfer function sheet with the option to upgrade to a 30 point.
My preference would be to eliminate the MAF sensor and load a MAP based tune to the ECM. Something I'm all too familiar creating based on MAP and ignition advance. Something that's apparently not possible with these cars as there are no tuners that work with it and it has no MAP sensor?

 

Pro M will tune it for your engine size. I emailed them about the injector size and they told me to fill the form as “stock” injectors. I have the 92mm version but I just don’t see a great deal to be had on your engine unless you’re going to build it out with cams, individual throttle bodies, ported heads, long tube headers, etc.

Just my 2 cents

 

I just want it to read and calculate accurately or it's holding back on the full benefit of a CAI.
I guess I could monitor my fuel trims with my CRP 123. It monitors 88 functions in real time including the MAF, LTFT and STFT, IAT, MAP, Cam Timing to name a few. I'm not sure what they should be tho and I'm just getting to know this OBDII reader.
Will the ECM relearn or should I do a hard reset?

 

The ECM will adjust on its own.

I briefly looked up that scanner and it looks good. I would like a good scanner to use with the iPhone but, I got one about 5 years ago (torque app??) and never could connect to it. It was a very cheap Bluetooth adapter.

 

Yeah, I got a good deal on the scanner used off the snap on truck for $50.. I hooked it up briefly with the car running and monitored all the functions. Works good.

 

From everything I've seen, I need to reset the fuel trims at the very least if not replace the MAF sensor. I think it's confused. I'm certain the velocity and how it's hitting the sensor has changed dramatically.
It could be quite some time for the ECU to relearn.
I'm surprised it's not throwing a code with my fuel trims.

 

I'm pretty sure my MAF sensor is just whacked out. It's consistent and both banks are equal and it runs great and goes like a you know what. Tried cleaning it. I'll do a reset but...

 

Are the fuel trims roughly the same when the engine is cold vs when it’s at operating temp?

I just changed out another POS aftermarket MAF sensor on a 00’ XK8 so I would either get a good used oem sensor or a new oem sensor if I were you.

 

Yes, roughly the same. Idle 112% LTFT 128% STFT. Or roughly there abouts. Goes up when I get on it.
Runs great tho. No codes. 02 sensor relative is 1%.
I'm almost certain it's the MAF sensor that's whacked but I'm going to do a hard reset. Been leery to since it runs spot on. Didnt want to do it during the work week. Don't have much time when I get home before dark.