[GAJ]

OK, so Motorcycle Consumer News USA just tested both of these items on a F650GS and as they are famous calling something "snake oil" when they find it I read it expecting to read exactly that; that these devices are all smoke and mirrors.

Evidently these things actually work and they found the performance of the $150 Booster Plug to be IDENTICAL to that of the $45 Accelerator Module.

What they found REALLY surprised me.

The December issue just came out and is not available free on line yet so I will paraphrase:

Acceleration from stop is smoother.

Shifting is smoother due to no delay in off-throttle response.

Immediate response to throttle rotation unlike stock.

Dyno testing revealed an insignificant 1hp boost.

1800 mile test of each product vs stock revealed a surprising +9%mpg for the Booster Plug and almost +11%mpg for the Accelerator Module, (that's a total of 5,400 miles).

The MPG increase is a result of upshifting sooner as a result of improved acceleration according to the Accelerator Module manufacturer and therefore running a lower average rpm overall, (can't say I complete understand that to be honest).

I will be asking Santa to buy me the Accelerator Module for Christmas! [lol]

Here are the links to both manufacturers:

http://www.boosterplug.com/shop/frontpage.html

http://www.sol2.be/Performance/ENG/Home/index.html

 

[de100kb]

Thanks Geoff, that confirms what I already thought, the only thing needed is the resistor, everything else is just to give the impression that product has more to offer as the cheaper solutions. Making one yourself should give the same result.

 

[belinassu]

tweaking iat sensor directly produce better results...
have a look to my guide i wrote after i developed it
(i'm only an entusiast, i don't sell anything)

http://digilander.libero.it/belinassu/IAT.pdf

the document is in italian, if you doesn't understand it u need a tranlater, but immages and graphs are simply to unserstand even without a translation...
[]

a simple resistor works only in a precise temperature window...
u need the correct NTC to work in all climatic conditions in the best way.

 

[GAJ]

tweaking iat sensor directly produce better results...
have a look to my guide i wrote after i developed it
(i'm only an entusiast, i don't sell anything)

http://digilander.libero.it/belinassu/IAT.pdf

the document is in italian, if you doesn't understand it u need a tranlater, but immages and graphs are simply to unserstand even without a translation...
[]

a simple resistor works only in a precise temperature window...
u need the correct NTC to work in all climatic conditions in the best way.

I'm sure you are correct but what I don't know about electronics would fill a Football Stadium! [lol]

I'm just shocked that something seemingly very simple can have as dramatic an effect as confirmed by a VERY skeptical magazine that I have trusted for years.

Have you seen a 10% improvement in fuel efficiency with your solution?

 

[belinassu]

i noticed same consumtpion driving faster...
but a friend that use my mod confirmed better consumtion (24km/l instead of 23km/l)

torque improvement let me drive with 6th gear even at 2000rpm
so consumtion matbe is better...

now i get rid of this mod because i remapped directly the bosch ecu changing dramatically the engine behaviour...
if u don't plan to rechip your ecu (+8cv in my case)
IAT mod is the best way to improve engine performances with a cheap trick...

 

[montanaman]

i noticed same consumtpion driving faster...
but a friend that use my mod confirmed better consumtion (24km/l instead of 23km/l)

torque improvement let me drive with 6th gear even at 2000rpm
so consumtion matbe is better...

now i get rid of this mod because i remapped directly the bosch ecu changing dramatically the engine behaviour...
if u don't plan to rechip your ecu (+8cv in my case)
IAT mod is the best way to improve engine performances with a cheap trick...

you wanna translate that to 'english'?

 

[belinassu]

i apologize for my poor english...
i mean that consumption with iat mod is similar to original bike
and it's a good mod even if a ECU mod is a better choice

 

[GAJ]

Got the Accelerator Module for Christmas.

Works exactly as advertised...not enough time with it to gauge any change in fuel consumption but for us electrically challenged types it's an easy plug and play upgrade that definitely improves throttle response and also allows smoother upshifts.

Here's a PDF of the Motorcycle Consumer News review:

http://www.sol2.be/Visibility/Images/MCN_1312.pdf

 

[Thumper710]

i apologize for my poor english...
i mean that consumption with iat mod is similar to original bike
and it's a good mod even if a ECU mod is a better choice

Don't apologise for using a foreign language .... you're a bloody genius .. genio sanguinosa[][]

I translated and did some text editing, there's a pdf I've just done when I can work out how to post it ....

Here http://freepdfhosting.com/6d371e8540.pdf

A stoichiometric amount or stoichiometric ratio of a reagent is the optimum amount or ratio where, assuming that the reaction proceeds to completion, where all of the reagent is consumed, there is no deficiency of the reagent plus there is no excess of the reagent. .... you'll need to know that for the article to make sense

Thank You Andrea .... molte grazie

 

[belinassu]

thankyou for your translation
i hope to get the time to finish the job on reflashing ecu after camshaft changing and airbox mod...
maybe original 65hp will grow up to 95hp....[]

 

[montanaman]

Did not mean to offend anyone. It just that this "mod" seems to be not what the MCN magazine claims. There are engineers over at ADV rider that seem to know that there is no way that fuel consumption can be reduced with these modules. I am only interested in gaining 10% fuel economy to stretch the range on the F800 a bit. A bit more power on this bike means nothing to me. I did not buy it for the power.. It will always be limited there and I'm fine with that..

 

[FrankV]

I'm using the Accelerator module now for several years, first on my R1100RT and now on the F800GT. I can confirm the findings of MCN: engine picks up better at low rpm, is running smoother. For the R1100RT this module was really needed to eliminate the famous "KFR" of this boxer engine. At the F800GT it is just more fun []!
I have measured no influence on fuel economy, not better, not worse.
It is a cheap modification and extremely easy to install!

 

[Thumper710]

I didn't post the pdf as a 'response' montanaman, I'd nearly done it anyway, I like his simple way of just connecting resistors up in series was then measuring the change

Possibly increased mpg that MCN got was by riding the same way, not taking advantage of the better pick

I find the biggest difference that the f800 has to my other (carbed) bikes is that the throttle doesn't always feel 'connected' when you try to accelerate below 3000

FrankV .. so it really does take away that hole in throttle response then?

 

[FrankV]

Which hole ? [][]

 

[belinassu]

fuel consumption is better if you drive with hi gear using increased torque...
if you drive using increased power at lower gear consumption is worse, but you'll fell better []

actually consumption is similar to original in normal use...

 

[de100kb]

I've saved Thumper710's pdf for future reference and have added it as an attachment.

Thanks Thumper710 and most of all belinassu!

 

[Thumper710]

After the BMW dealers spent 5 & 1/2 hrs on it, total fuel strip including drain the tank and try another pump, 4 test rides and it still cuts out, I fitted an Accelerator basic unit to my stalling ST ..... it stopped stalling, 2 weeks a 600 miles later it runs perfectly and mpg has risen ......

For what they cost it was a bargain, thoroughly recommend it ..... pity BMW don't fit them, an admission of failure if they did maybe?

 

[Mokkybear]

The reported success of the Accelerator Module is interesting, given the arguments elsewhere that the Bosch ECU adapts its long term fuel trim to compensate after a few tens of kilometres. I fitted one to my ST, only because it was relatively cheap compared with the Boosterplug, and I have experienced rare occasions of stalling. It seemed to make no difference top my bike, but I loaned it to a mate with an R1200R and he says it has transformed the low rev running of the bike (the improvement persists).

A more elegant solution is the AF-XIED (http://sales.nightrider.com/AF-XIED-for-BMW_p_54.html) which intervenes between the O2 sensor and the ECU, telling the ECU the mixture is leaner than it really is (by emulating a modified O2 sensor reading). This allows the user to modify the AFR across the range. Search Advrider forum for lengthy discussion on the matter.

I'm still not convinced either way. Yes, the AF-XIED is an elegant device that I believe works as stated. Whether the Accelerator module is a dud as implied in the Advrider forum, well the anecdotal evidence doesn't support this theory, so maybe there's something else going on, e.g. in the transition between off and on, that the Advrider guys aren't yet aware of.

 

[belinassu]

it is not so simple to fool the iat sensor to gain an effective good behaviour of our rotax engine.
i did several trial based on re-calculated effect of different values of NTC on some excel documents...
i built some modified IAT for some friend with F800GS-R-S-ST and F650GS .
some of them having boosterplug or accelerator module or some other cheaper clone...
they told me my modified IAT works better, and the engine performs better...
it's important to use the correct kind/value of NTC for the bike and the setup (exhaust, air filter and so on..)
but in commercial plugs this job isn't done, they sell a version for all and this way of tweaking doesn't optimize the trick.
So lambda sensor will cut any wrong signal from iat cutting performances in the same way...
Any mod on iat sensor give something but only working in the same way of the original sensor ecu could manage this signaling properly.
I prefer to do not tweak lambda sensor, so the only way to do a good job is to modify the software parameter inside ecu BMSK.
Infact torque and power increase significantly even if reprogramming gas engine usually dont lead to as great increase as on a turbo engine...

excuse me for my poor english

 

[itsatdm]

I am running both an Accelerator Module and the AF-XiED on my F800gs. The Accelerator Module has been on the bike for several years, mainly in an attempt to deal with a low speed abrupt throttle syndrome, while riding off road. I thought it worked OK at the time and seemed to be working 2+ years later.

I read the threads on ADV dealing with the AF-XiED and had a lot questions about the "Adaption" process. How does changing the oxygen sensor signal, which can only occur in closed loop, affect open loop map values?

I bought one and added it to the bike along with the Accelerator Module. I noticed an increase in low and mid rpm torque right from the start. I not sure how it did that, as I was riding in open loop with little time for adaption. I have about 1,200 miles on it. I don't claim it makes more power than it did when first installed, but the engine has gotten smoother and the power increase has widened some what to include a broader rpm range.

Install time is so short you can almost do back to back testing.

Right now I am testing the above with a 17 tooth sprocket, as I thought with my new found power, it would pull the gearing well. About 300 miles with that set up and it seems to confirm what I hoped.

Mileage hasn't suffered. I can still ride Fire roads. Less vibration, Not gearing for the hard core.