Accelerator Module

[Deleted account 190920001]

Its long and complicated and but the short is what makes power might not be what feels the best. A weak mixture might feel snatchy but could be the optimum for power output. When you ritchen the mixture you can take an engine off the power so it feels smother and to your seat of the pants feels like it makes more power but in reality it doesn't. Agree with the lean emissions or not the fact is that BMW have built the engine to run as good as it can within the components that are in the engine. Putting more fuel in by itself wont necessarily make any more power without changing other components or settings of the engine. For example you might find that changing the ignition timing along with the extra fuel could release extra power. Like I said its complicated and what works for one engine might not work for another. Pretty sure there will be guys on here who have dyno experience who can explain it better than me but thats the basics of it.

 

[roadrubber]

Thanks for the response Marki. I'm with you on this.

..Putting more fuel in by itself wont necessarily make any more power without changing other components or settings of the engine.

In fact had it not been for the number glowing posts in this and other threads I would have been pretty sceptical about that being a viable way to improve the performance of the motor.

Yet that's basically all these modules do, right? The doctored temperature signal asks for more fuel so when the system is running open-loop that is what comes through. And, possibly snatchiness (in addition to changes in throttle position) begets open-loopness and so the conditions for the modules to make more fuelness to mediate. Maybe..?

So when this approach doesn't work so well, can it just be down to engineering tolerances? Or would it be an indication that the motor or some aspect of the setup (exhaust, filter, timing etc) could do with some attention?

 

[Phil Thomas]

Surely, it's not about more power - it's about making an engine deliver the power smoothly at the bottom end. More rideability, in the real world.

Regards to all,

Phil Thomas

 

[roadrubber]

Surely, it's not about more power - it's about making an engine deliver the power smoothly at the bottom end. More rideability, in the real world.

Regards to all,

Phil Thomas

Quite right Phil, not about increasing maximum power output, definitely a power delivery / useability thing, maybe not just bottom end tho. I think people are saying that they're getting better roll-on even higher up the power band. But yeah.

 

[Deleted account 190920001]

without standing up for either the module makers or the owners who reckon things aren't so good, what we have right now is wildly varying temperatures. Look at the dates those who said it wasn't so good or are getting poor fuel consumption. They have posted after some of the really cold spells. My GSA is completely stock and the fuel consumption is worse by about 30 miles in the tank. Some of the more enthusiastic reports are probably after a warmer spell and we all know there is nothing like a bit of sun and dry roads to make a bike feel great. The truth is probably somewhere in the middle where there is a smoothing of the power delivery in the low revs. This is why a dyno doesn't really show much, because there isn't much to show. The MK1 seat of the pants has emotions and is generally a fickle instrument where the dyno couldn't care less and says it as it is.
Just an example of how seat of the pants can be wrong. I build fuel injection systems in my spare time (megasquirt) and I had one guy who bought one off me and thought it was the absolute business and he thought there was much more top end power. The truth though when he got the car on a dyno was that he had bodged the fuel mapping and there was actually less power in the low revs so when he hit the ramp on the power curve it felt like a rocket to him.

 

[aceranic]

I have fitted FRK on my 2007 GS about ayear ago and can't say there is any dramatic or even noticeable difference.

I didn't have chance for dyno run but must say I'm dissapointed with all marketing bla bla's on their site.

 

[DaveyP]

OK guys have read all about these can someone tell me the best place to get Mavn's or the Jens one and what do they cost
DaveyP

 

[Wapping]

OK guys have read all about these can someone tell me the best place to get Mavn's or the Jens one and what do they cost
DaveyP

From Mavn or Jens, at a guess.

Follow links.

 

[ebbo]

http://www.boosterplug.com/
http://www.sol2.be/Accelerator/English/index.html

 

[Balders1450]

Acc module 2010 GSA

Has anyone fitted one to a 2010 GSA, and if so what is their mpg?

 

[luckylucian]

Finally fitted MAVN module to mine last weekend. Much smoother throughout the rev range (much reduced surging too) so I ended up reving more in the lower gears, much faster progress, and an mpg of 49.1, compared to 49.5 before.

 

[sieve68]

got an acc

got one fitted it feels better

 

[twintrees]

My 04 GS has it's 24K service booked, it has no CAT (straight through headers)
Any thoughts please on leaving or removing the accelerator for "tuning" purposes?
Ta
Mick

 

[GSEddie]

got one fitted it feels better

What he said

 

[Melly Senior]

Would like to confirm/support Magnon on his comments on Jens 'Booster Plug' - have just fitted mine and had a run out this very afternoon; mixed route with town, country lanes and motorway. Couldn't believe the change, in particular the slower second gear in town and narrow country lanes. I was getting very fed up of the lumpy slow speed but this has sorted that out for me 100% and has indeed changed the feel of the bike completely

09 GSA with standard exhaust (for now)

Fitted Jens Booster Plug today and I’ve been out and about for a quick ride (Temp +5oC) staying mainly in town because as this is where you really notice the bike is transformed and it’s now a pleasure to bumble in town traffic.

Gone is the feeling the engine could falter if you don’t keep the revs up when manoeuvring at low speed. As soon you feed the clutch in the engine feels stronger, this gives you confidence, consequently you’re not revving the engine so hard when clutching, you find yourself changing up earlier and trickling in a higher gear without any surging, pick up from low revs is smooth and more controlled.

I don’t know about any fuel consumption benefit at the moment, but others have reported an improvement, so it beggars the question if the bike rides so much better with these plug-in devices fitted (Jens or Mavn’s) and fuel consumption is improved why aren’t they set up like this in the first place?

If it’s due to some emission test set by big brother then the test criterion is wrong because to my way of thinking if MPG is improved then less sh1t is going out the exhaust mile after mile resulting in less green house gases being emitted for the life of the bike or am I missing something? Pray tell.

07GS 8K on the clock de-cat STD headers Remus powercone.

 

[Magnon]

Would like to confirm/support Magnon on his comments on Jens 'Booster Plug' - have just fitted mine and had a run out this very afternoon; mixed route with town, country lanes and motorway. Couldn't believe the change, in particular the slower second gear in town and narrow country lanes. I was getting very fed up of the lumpy slow speed but this has sorted that out for me 100% and has indeed changed the feel of the bike completely

09 GSA with standard exhaust (for now)

I have refitted the original silencer, the pick up is much stronger from the bottom and midrange improved. These engines don't perform at their best with free following cans in my opinion. Remus power cone is now hanging from the workshop ceiling!

P.S. Still loving the Booster Plug.

Magnon

 

[Melly Senior]

sorry if this is an idiot type question Magnon, but have you now put the cat back on

I have refitted the original silencer, the pick up is much stronger from the bottom and midrange improved. These engines don't perform at their best with free following cans in my opinion. Remus power cone is now hanging from the workshop ceiling!

P.S. Still loving the Booster Plug.

Magnon

 

[Magnon]

sorry if this is an idiot type question Magnon, but have you now put the cat back on

No the bike is running original headers with the cat element removed (hell they take some getting out), std air filter and end can. The engine is really strong and will lift the front wheel in 1st off the throttle dead easy...

 

[roadrubber]

Would like to confirm/support Magnon on his comments on Jens 'Booster Plug' - have just fitted mine and had a run out this very afternoon; mixed route with town, country lanes and motorway. Couldn't believe the change, in particular the slower second gear in town and narrow country lanes. I was getting very fed up of the lumpy slow speed but this has sorted that out for me 100% and has indeed changed the feel of the bike completely

09 GSA with standard exhaust (for now)

+1

Fitted (I say fitted but what I mean is removed seat and "plugged in") Jens' unit today. Only had time for a short wobble around town but weaving through rush hour traffic was a whole new ball game. Once I stopped thinking about the unit and what it might be doing and started just riding I began to notice the differences - general lumpiness gone, loads more pull, nice and strong in 2nd gear, basically just what others have said.

Top piece of kit.

 

[Melly Senior]

sounds like some more work for me to do

No the bike is running original headers with the cat element removed (hell they take some getting out), std air filter and end can. The engine is really strong and will lift the front wheel in 1st off the throttle dead easy...