Fuel Max Performance Chip

Anyone seen these or had any experience with them?
Did they make good on their claims to increase power, torque, and fuel economy?

http://www.ebay.com/itm/380266159045?item=380266159045&viewitem=&vxp=mtr

 

Most likely not.

There are no proven "chips" for these trucks.

Your best bet for an increase in power (and only under open loop) would be a URD Maf Cal from urdusa.com

 

The 35hp and 4 mpg part is bullshit.

The the 50% better throttle response can't be argued, it's real.

 

35 hp + fuel reduction = 100% bullshit. All they have to do to improve throttle response is get rid of the electronic lag.

 

Pardon my ignorance, Blasphemous, what is the difference between this one and the URD MAF sensor? Besides price?

 

what you posted plugs into the obd2 and does nothing

urd maf is hard wired into the ecu and leans out the factoru rich fuel mixture

 

Can the URD be tuned for better MPG and less power?

 

solid question ^

 

x2, if you're running in open loop frequently, you aren't going for MPGs. If you aren't familiar with open vs. closed loop, typically open loop is higher RPM and higher throttle position. Typical driving around town may never put you in open loop.

 

So the URD MAF is basically only for power and expect to lose some more MPGs?

 

In closed loop, your current MAF sensor adjusts the fuel map if you will to make the engine more efficient. Once you go to open loop, the ecu defaults to a set map. The URD calibrator wouldn't allow the engine to just default to a set map when in open loop, it instead keeps talking to the ECU and tires to make the engine as efficient as it can be in the open loop. It's not really complete to say it's just for power the problem is someone looking for MPG improvements wouldn't spend a lot of time in open loop. If you tow, you might find yourself in open loop more frequently because your engine will keep trying to make more power. Hopefully not too confusing.

Even with the URD MAF calibrator, in closed loop, you will see no change at all as your ECU will stick to it's normal routene.

 

Gotcha

But I must point out that deceleration fuel cutoff is also an open loop mode, zero fuel use. Doesn't really apply to what a maf cal could effect though.

 

Open loop/Closed loop. Can someone explain in knuckle dragging terms?

 

Open loop: warmup up mode before the cat is up to temp. Basically the ECU is running a static set of parameters and is not using O2 sensor feedback.

Closed loop: the ECU is fully online and adjusts parameters based on feedback from system O2 sensors and other inputs to optimize combustion and timing.

 

Oh, and aftermarket "performance" chips, unless designed to support a specific mod like a 'charger, are worthless... except to the folks selling them. Come up with a fancy high perf name, tweak a few of the parameters that have already been exhaustivey optimized by Toyota, make ridiculous perf or mileage claims, then sell them with an asterisk that "results may vary" which basically is an overt admission of their worthlessness. What a business....

 

Closed loop is literally a closed loop, like a circuit. Read map, send fuel, read o2 sensor, change map, read map, send fuel, read o2 sensor, change map... and so on. That way barometric pressure, humidity, fuel quality, and engine-specific tolerances all are constantly compensated for to improve efficiency.

If the ECU can't trust the o2 sensor it can't do that recurring logic loop, thus "open" loop (like an open circuit). The fuel trims (map changes) determined during closed loop operation ARE applied when in open loop operation.

The o2 sensor is useless when 1) it's too cold on startup 2) full throttle when the engine is running richer than stoichiometric and 3) when in DFCO when zero fuel is going through the engine.

 

I figured it was worthless. Just wanted to know what everyone thought of them.

Anyone have experience with the URD MAF sensor?
Is it only power/HP/torque gains? Or can I get MPG too?
And don't tell me it depends