So I've got a new issue for you guys. I've done a lot of work to my engine. I made a high flow intake, ported and polished the intake manifold and heads, long tube headers, 3" exhaust, last night I even retrofitted a pod filter into the factory air box so I can more easily route my snorkel with better filter placement. I'll have a write up for that coming soon. I've done all that and I'm not finished yet. I'll be going to a slightly higher compression in the future with taller pistons and, of course, fresh rings which should help my compression pressures (around 100lbs/cylinder right now), and a little smoothing of the hard edge in the throttle body and other areas of the intake track.

It's gone far enough that I had to retrofit a pod filter because I had maxxed out the factory paper filter. With the paper filter she'd do 0-60 in 10.1 seconds. Without a filter she'd do it in 9.02 seconds (pretty d*mn good on 33" tires with stock gears, if I do say so myself), and I noticed a huge power difference when towing with/without.

Now I've got another issue. Around 4200 RPM at WOT the MAF sensor is pegged. It reverts to a zero reading from too much air flow for it to handle. I'm looking for possible fixes.

Right now the only one that comes to mind is to go to a larger sensor body (maybe 1/4" larger ID) and then hope that the ECU can learn to correct for the improper air flow readings through O2 readings.

Another question I have is what does the ECU do when the MAF is pegged? Does it lean out because of the zero reading? Does it go full rich? Maybe it reverts to the factory fueling tables by RPM? I have not idea, but I'm hoping someone can provide some insight.

Thanks everyone!

 

 

The sensor is the same, but the 4.6 housing is slightly larger. My engine is a 4.6 however, so already has the 4.6 sensor.

 

 

An interesting idea. Do you have any knowledge or experience with those sensors? Looks like the sensor is completely different. I'm not sure if the sensor readings would be 1:1 with the LR sensor readings. Possibly not even usable by the LR ECU. Any idea what kind of input/output the Ford sensor uses?

 

 

Recalibrate the computer. The MAF isn't maxed, just the readings for voltage outputs is maxed. That sensor can flow more air than your engine will most likely ever breathe. The issue is the computer is only calibrated to read so much air in general. You need to tell it that it's able to see more air and how to deal with it. What's the injector info? You'll max those usually long before you max a MAf sensor.

 

Unfortunately nobody in the US seems to be able to touch the factory tune.

 

Well that's what you need, get creative. Anyone should be able to dig into these old computers with relative ease. It won't be cheap though. Putting a bigger sensor in won't fix the issue that computer has no idea that it need more fuelling and air because of the better flow. A bigger MAF will only confuse the computer even more and it will run like garbage. Start at a shop that deals with V8 engines, a corvette shop or a mustang shop. Their tuning guys should be able to at least have a look.

 

Land Rover Tuning - ZR Auto and a few other places here in Canada do tuning for LR engines. I'm sure there's gotta be more places in the States