Accelerator Module

[jenslh]

Hi,

.... I offset the temperature with -20 degrees over the whole temperature range, except for the minus degrees. The more minus degrees, the less offset you must give. You need to to this, otherwise too much fuel will be injected and your engine will not like it too much. I suppose Jens can confirm this. What I'm trying to say is that the module will work just fine under all weather conditions. (-100 degrees C to +100 degrees )

Mavn:

I promised myself that I would stay away from this thread because it could very easily end up in a flaming war about whose product is the best, and I dont think thats worthy for any of us.

Your comment that you could fancy up your product a little and sell it for 4 times the price today, could cause a negative reply from me about the ability of your product, and the war would be on..

You suggest that I confirm your statement, and I'll add my comments below, but this will be my last post in this thread. I'm still out there, and I may well enter other discussions. I'll be happy to answer all questions by mail, and the FAQ on my website will be updated today with answers to some of the very qualified questions I've received.

But back to your technical quote:

I can not confirm thats it a good idea to snap away the offset at zero degrees celcius.

Every FI-ECU will add 3% of fuel when the temperature decreases 10 degrees celsius to keep the air/fuel ratio at the same level regardless of ambient temperature. The air molecules will be closer together at lower temperature, so the amount of air going into the engine will contain more air molecules, and the ECU will add fuel to compensate for that. All engines run on the same type of air (obviously) so the 3% per 10 degrees rate is the same for all engines.

I cant speak for your module, but the BoosterPlug will lift the entire fuel map from an air/fuel ratio of the lean 14,4:1 to the 13,6:1 that the engine wants for superiour driveability. I certainly want that to happen regardless of temperature.

So going back to the lean mixture and the jerky digital acting throttle, when the roads get icey and slippery, is not a good idea in my book.

/Jens

 

[pikeydave]

Best 29e I've ever spent. Even before I started the bike I found it looked faster, cleaner, the Sun came out, it didn't snow, the wife looked (more) attractive, the dogs behaved, I won a gift from readers digest, i felt more assertive, strangers called me sir and my cock was perseptively bigger

Can't wait to fit the Boosterbuttplug.

 

[Gipsy]

Am I the only in here who would like a simplified version of this thread?

 

[gsbiker]

Should be the other way round. Cold air is denser, so you get a better charge into the cylinder, making the process more efficient.

Thats interesting, then how come I'm getting less miles per gallon from my cars when it colder? My work Mondeo has been slipping from 38mpg now down to 36. BMW GS similar. Was getting around 50/52 now it's around 45mpg. I know how it's ridden and road speed makes a difference but I assume it was the temp causing more choke during the cold etc.

 

[gsbiker]

Am I the only in here who would like a simplified version of this thread?

I'll have a go...

1. buy the Accelerator for £29 delivered - http://www.sol2.be/Accelerator/English/Order/index.html
2. fit it in less than 5 mins - http://www.powerfrkusa.net/setup/bmw-installation-guides/r-1200-gs/
3. then hold on and enjoy a faster more responsive BMW! - http://image.automotive.com/f/features/9921002+pheader/122_0702_01_z+BMW_R1200GS+wheelie.jpg

simples!

Note; This small plug n play upgrade is not a replacement for a more sophisticated Power commander and dyno setup costing around £500. But it does improve the low down pick making my bike at least feel livelier, which makes for fun riding especially in the twisties! Seems this type of technology has become popular because you can also buy the Power FRK costing over £200 delivered or the Booster plug which I think is around £90. The accelerator is £29 delivered. Not sure if there will be much between them in regards to performance, maybe a small amount more but not as much compared to the difference felt between with or without the Accelerator in place I wouldn't of thought.

 

[miked]

Thats interesting, then how come I'm getting less miles per gallon from my cars when it colder? My work Mondeo has been slipping from 38mpg now down to 36. BMW GS similar. Was getting around 50/52 now it's around 45mpg. I know how it's ridden and road speed makes a difference but I assume it was the temp causing more choke during the cold etc.

Don't forget in cold weather you will have your lights on more often, heated rear screens and fan blower, etc.

All causing more current drain and making the alternator harder to turn = slightly higher fuel consumption.

Try leaving an older car ticking over, (one without idle stabilisation) and turn on the lights / heater and hear the engine speed drop.....

Plus, engine takes slightly longer to warm up, needing a little more fuel enrichment from the injection system / ecu.

it all adds up!

 

[karlp]

Should be the other way round. Cold air is denser, so you get a better charge into the cylinder, making the process more efficient.

Not quite correct.

Cold air is denser so effectively more oxygen is pumped into the engine.

The sensors then adjust the fuel to take account of the drop in temp so inject more fuel to keep the air:fuel ratio within the set parameters determined by the ECU (however these may not be the best parameters just those set by the manufacturer).

This is the reason why the bike 'seems' / is more powerful in colder temperatures.

That is how this module works - it fools the ECU into thinking the air temp is less and so dumps in more fuel.

The bike can however return a better fuel consumption even in these circumstances but that is another story.

 

[Owen Snell]

Not quite correct.

Cold air is denser so effectively more oxygen is pumped into the engine.

The sensors then adjust the fuel to take account of the drop in temp so inject more fuel to keep the air:fuel ratio within the set parameters determined by the ECU (however these may not be the best parameters just those set by the manufacturer).

This is the reason why the bike 'seems' / is more powerful in colder temperatures.

That is how this module works - it fools the ECU into thinking the air temp is less and so dumps in more fuel.

The bike can however return a better fuel consumption even in these circumstances but that is another story.

I was not commenting on the enrichment from the accelerator module, just the effect of temperature on engine performance. The engine management will maintain the correct mixture, but the the denser charge is inherently more efficient meaning more power or better mileage depending on how you use it.

 

[E. Buygum]

I was not commenting on the enrichment from the accelerator module, just the effect of temperature on engine performance. The engine management will maintain the correct mixture, but the the denser charge is inherently more efficient meaning more power or better mileage depending on how you use it.

Yeah but it takes ages for the engine to get up to temperature so you could be moving thick oil for quite a while. Cold tyres roll less efficiently and you have to push aside thicker air.

 

[Pukmeister]

Its a heat engine working on the otto cycle.

More heat lost in a colder environment = a loss of efficiency.

Under Charles law for gasses, a denser air charge would require more work done in the compression phase.

 

[OldCroc]

Mine arrived in the mail yesterday - after being posted on 5th December - snail mail or what!

 

[Owen Snell]

Its a heat engine working on the otto cycle.

More heat lost in a colder environment = a loss of efficiency...

The engine has excess heat available, so as long as it reaches operating temperature the ambient does not have an effect.

....Under Charles law for gasses, a denser air charge would require more work done in the compression phase.

Yes, and more work released from the higher compression charge in the combustion phase. High compression engines are more efficient, which is the point I was making. A cold charge effectively increases compression ratio slightly, as long as the management system compensates with more petrol.

 

[Flipper_Man]

Mine arrived in the mail yesterday - after being posted on 5th December - snail mail or what!

Hmm....I wont hold my breath for the one I ordered Friday night then !

 

[gsbiker]

Anyone with an accelerator also have a K&N? Is it worth the extra £40+ ? I'm considering!

 

[JerryP]

For those who wish to make their own gizmo, there is a very interesting thread with a lot more technical info on this subject here:
http://forums.pelicanparts.com/bmw-...ture-sensor-improving-engine-performance.html

Interestingly, they seem to think around 20k ressy in series with the temp sensor works well. I came to a similar conclusion using a pot and some quick tests. Will try harder when the weather warms again.

 

[Coolcarbon]

Anyone with an accelerator also have a K&N?

Yes, but I haven't been out yet with the Acc. I've also got an 'Easyflow' cat and stubby fitted....

 

[CliveS]

What a rather long and interesting thread. You have my interest. Currently I am in Australia and the summer temps this year are the hottest ever. Many days in the late 30’s and early 40’s.
So how will the unit go under these conditions? Does any one have any opinions yet?
I will purchase one soon as Christmas is over and test it out

Safe riding

 

[robfin]

MAVN contacted me to say my Acc was dispatched on 14th Dec. Not arrived yet, but as we still have 6-8ins (200mm) of snow and my 1200GSA is tucked up on charge (not the BMW rip off, but an Accumate wired directly to the battery......sorry that's another thread......) I am not worrying yet.

The 'snail mail' is as described but I am old enough to remember when the standard text on adverts was 'Please allow 28 days for delivery'....!!

Merry Xmas to all.

robfin

 

[mort77uk]

Worth noting that the Accelerator website says 'no shipments during the holidays 23/12 - 10/01'

 

[Magnon]

Just rcvd my Booster Plug this morning, just need a thaw to test it against the Accelerator Module I already have.