Temp Spoofers
 

I'm not willing to go all in on a Power Commander and the associated dyno runs and custom tuning, so I wanted to see if there was any current feedback on the use of a temp spoofer and if it helps with fueling and throttle response. I also don't want a significant drop in milage.

I know there is a lot of info on the list, but much of it is dated. The players seem to be Booster Plug (reasonable at $150), and then AF-XIED and FRK at $379 and $293 respectively. Seems like a crazy amount for some resistors in molded plastic for the latter two? I have no idea if the AF-XIED is any different from a regular spoofer?

Any current input from anyone that has added one of these and the effect that it had?

I just have an Akro slip-on and the cat is still there. No header replacement.

Thanks!

Can you spare .1 cent for a resistor?

I just installed the AF-XIED on my R1100 (yesterday) and it had the same terrific effect it did on my R1150...

Smoother response across the rev range.... guess you need two for the dual sensored 2015 GS.

Hi Bob,

The booster plug is an air temp spoofer and makes the ECU " think" ambient is colder than actual, causing it to enrich the mixture. The AF-XIED ( which I have and like) is an oxygen sensor spoofer and is in line with each oxygen sensor. This nice thing is you can tweek the mixture by turning a potentiometer. To nitro's point I hope there's more to it than that, at least it has enough internal logic to make 3 LED's blink! The disadvantage to both is that there is no provision to adjust the ignition timing.

after reading all the propaganda on the Booster Plug website, I decided to get one. I hope it will be here in the next 2 weeks. I have a R1200S with Remus header (with oxgyen sensors) and a Akrapovic slip on.

I do not know of a dyno guy locally that I trusted with my BMW (they mostly do HD) and I didn't to pay some chuckle head bouncing my bike of the rev limiter multiple times in hopes of getting it setup correctly

Once I get it installed I'll let you know what I think.

Looking forward to hearing how it goes.

I have used a Boosterplug on my K and it works. But it is not some magic pill, be all cure all. Be realistic in your expectations. If the bike is stock, it works pretty good. Not perfect, but likely good enough. If you did changes to exhaust, filters, cat, etc, it is going to improve things but likely not sufficient enough to fix the problem you feel needs fixing.

Having watched several of your holiday vids I spend more time listening to the motor than the vid because your bike sure as hell doesn't run anything thing like mine which has a Rexxer map on.

Feel free to elaborate. :) Just keep in mind that 1) it's not sporting a Boosterplug anymore but a Powecommander V with custom map and 2) 95% of the sound you hear, if not more, is from the open intakes and highflow filters (ie the hammering sound you hear when I open the throttle comes form the airbox). I have removed one of the two 'intake mufflers' as BMW calls them and it does make a huge difference in sound.

That said, still not entirely happy and still contemplating the Rexxer route as well.

Although the air temp spoofers are just NTC resistors potted in plastic, the AF-XIED is a microprocessor based unit that measures the O2 sensor output voltage, does some computations on the signal and then outputs a new voltage/signal profile with different levels and phase-shifted relative to the input signal.

The air temp spoofers all work on the theory that by making the intake air look cooler the ECU will add fuel. While true at first, both the Motronic and BMSK ECUs have powerful software that negates the "error" that they detect from the "wrong temperature" being supplied. It is easy to measure and show that this happens: 2004 R1150RT Wideband O2 Sensor Project (and AF-XIED for BMW) | Page 40 | Adventure Rider.

The AF-XIED works by knowing that the ECUs use the O2 sensor as the fueling standard for all final corrections and compensations. Since whatever the O2 sensor indicates IS the ECU's reference, the ECU will never try to correct it. In fact the ECU adjusts fueling and creates fueling trims that add an amount of fuel, to all fueling situations, equal to the shift dialed in on the XIED.

So for example, if you set the AF-XIED to shift fueling by 6%, the ECU will after a short time, add 6% fuel to all Open and Closed Loop fueling.

One way to keep the air temp shift from being negated is to disconnect your O2 sensor(s). That however disables the ECU's most powerful feature, long term adaptation.

It also puts the ECU in emergency mode which results in an AFR of around 12:1, which negates the reason for installing any device in the first place.

You're right about the ECU entering limp mode but my Wideband O2 measurements show that the BMW/Bosch limp mode actually shifts the fueling several percent leaner then several percent richer than stock from about 14:1 to 15.4:1. The reason is to bracket the operating range of the cat.

Interesting as that is the complete opposite from what I have found on my K, which runs so rich in limp mode the fuel almost runs out the back of the exhaust. :D

Runs pretty nice though, but a fuel consumption of 23mpg (US) or worse is not exactly usable with a total of just 4.7 gallons of fuel.

After installation of the AF-XIED, roughly how long do you think it would take for the 6% increase across the majority of RPM ranges that I use the bike , in my instance idle - 4,500 RPM ?

From 0 to 50% throttle it happens over the first tank or two of fuel. Depending on how you ride, several more tanks of fuel for all the long term trims to fully develop and for the gains to propagate to the 50-100% range.

The first time I watched a vid thought maybe it was just were you had the camera mounted and put it down to induction roar what ever but I've watched the last one several times and also noted you changing gear and the motor sounds like it is really struggling and looking at the speed on the screen by comparison mine is an absolutely screamer.

Now I know a lot of what went on with mine but not everything and I realise it spent some time on a dyno well in actual fact most of the day!! But even allowing for the camera sound and many other variables its a billion lights years away from how yours sounds.

Go Rexxer.

What would be the advantages of a Rexxer reflash versus AF-XIED? Both are in the $300 range here in the USA.

Rexxer is a custom fuel map written by Rexxer depending on what spec you have your bike at but rather than me write war and piece search Rexxer on here there is plenty on here and for those who don't know no you can't have an 1100 remapped with Rexxer.

After installing the header and slipon, the only thing I have noticed is a more pronounced lag in throttle response near redline when shifting up to the next gear, there is more lag before the fueling begins. I am hoping that this will help that

I also get a lot of popping on decel (which I don't mind)