Set the acelerator pump

mad max rr · 12-27-2006, 6:37 AM

Hello
Can anyone tell me what is the best set um for the acelerator pump ?
O have got a 954, with a micron beta race, stock air filter and the pc3 usb.

tuffy6969 · 12-27-2006, 4:28 PM

80% sensitivity, 20 revolutions, 20% enrichment.

Play a little from here. These are excellent settings for the 954RR.

Tuffy

vscorsa · 01-09-2007, 2:58 AM

I also have a 954 does the accelerator pump function make that much of a difference?

I haven't played with it yet.

tuffy6969 · 01-09-2007, 10:22 AM

Quote:

Originally Posted by vscorsa

I also have a 954 does the accelerator pump function make that much of a difference?

I haven't played with it yet.

It made a difference for me. You need to play with it a little as all bikes are different. Even if you have the same type of bike as I do....

Jungleboy · 01-10-2007, 7:51 AM

Good advice tuffy

I was having this exact discussion with my Dyno guy (Dave from Sydney Dyno for any Aussies reading this) anh his recomendations were quite similar 80% sensitivity, 20 revoulutions and about 10% enrichment so not too different to your recomendations

JBJ_Blade_954 · 01-10-2007, 9:21 AM

Hi guys, I have a 954 RR2 with a PCIII. is this a setting you change with the PCIII mine is the none USB version. just serial linked
Cheers
JBJ

tuffy6969 · 01-10-2007, 10:22 AM

Quote:

Originally Posted by JBJ_Blade_954

Hi guys, I have a 954 RR2 with a PCIII. is this a setting you change with the PCIII mine is the none USB version. just serial linked
Cheers
JBJ

Sorry mate - no go on the accelerator pump. The NON USB versions don't support it.

JBJ_Blade_954 · 01-10-2007, 10:39 AM

Thanks for your reply but what does tweaking the fuel pump achieve ?
Is it like the upping the PSI on a car TDI system so the fuel comes out of the injectors at a higher velocity ?
Cheers
JBJ

tuffy6969 · 01-10-2007, 11:52 AM

Quote:

Originally Posted by JBJ_Blade_954

Thanks for your reply but what does tweaking the fuel pump achieve ?
Is it like the upping the PSI on a car TDI system so the fuel comes out of the injectors at a higher velocity ?
Cheers
JBJ

This will explain it a heck of a lot better than I can. Good luck!

Dynojet_ap_parts.pdf

JBJ_Blade_954 · 01-10-2007, 12:58 PM

Thank you ;o)

tdeal28 · 01-11-2007, 10:06 PM

I have a question or should I say an observation that doesn't really make sense to me with this whole acc. pump thing...

Here it is: On almost all maps from Power Commander and Custom maps that people have had made with bikes that have full systems on them it seems that the maps are Leaned out to gain more horsepower, not enrichened.

With that said, wouldn't you think my making the bike run 20% richer would be going against what you you were trying to achieve through the power commander map?

I tried this on my 929 and I can't say that I noticed any diffrence, but thats just me.

matty_998cc · 01-11-2007, 10:27 PM

Quote:

Originally Posted by tdeal28

With that said, wouldn't you think my making the bike run 20% richer would be going against what you you were trying to achieve through the power commander map?

The accelerator pump will only affect the map for the small amount of time (10, 20 revs etc.) after the throttle is opened abruptly.

Because the air has much less inertia than the fuel it is able to accelerate much faster. Therefore a rapid opening of the throttle causes the air to rush through the intake much faster than the fuel droplets. This can result in a lean spike. By temporarily richening the mixture you can help eliminate the stumble or hesitation.

tuffy6969 · 01-11-2007, 10:56 PM

Quote:

Originally Posted by matty_998cc

The accelerator pump will only affect the map for the small amount of time (10, 20 revs etc.) after the throttle is opened abruptly.

Because the air has much less inertia than the fuel it is able to accelerate much faster. Therefore a rapid opening of the throttle causes the air to rush through the intake much faster than the fuel droplets. This can result in a lean spike. By temporarily richening the mixture you can help eliminate the stumble or hesitation.

Exactly.....

Tdeal28.....like I said earlier in the thread - - you have to play with the settings. The percentage numbers I was speaking about in post #4 was only a suggestion. Sometimes people install the PCIII and expect instant results and massive HP gains... It's not like that. You have to ride a little on one setting, remap, ride a little more, remap...etc. until you get the best result for YOUR bike.

Matty was exactly right when he said you only see it when the throttle is slammed to full open..or close to it. You get that instant burst. When the settings are correct for YOUR bike - you'll notice!!

mad max rr · 01-12-2007, 7:28 AM

I have tried on my bike, 90 sensitivity, 20 revolutions and 20 enrichment.
But i didn´t notice anything.

Does any one has a better idea for other setup ?

mad max rr · 01-12-2007, 12:33 PM

I few minutes ago i have tried 80 ses, 20 rev and 10 enr.
It´s much better, now i can notice the diference.

tdeal28 · 01-12-2007, 7:26 PM

Quote:

Originally Posted by matty_998cc

The accelerator pump will only affect the map for the small amount of time (10, 20 revs etc.) after the throttle is opened abruptly.

Because the air has much less inertia than the fuel it is able to accelerate much faster. Therefore a rapid opening of the throttle causes the air to rush through the intake much faster than the fuel droplets. This can result in a lean spike. By temporarily richening the mixture you can help eliminate the stumble or hesitation.

, thanks for the explanation. Maybe if I have time I will keep playing with the settings.

matty_998cc · 01-12-2007, 9:30 PM

Quote:

Originally Posted by tdeal28

thanks for the explanation. Maybe if I have time I will keep playing with the settings.

No problem. Like tuffy said, individual bikes (even if they are the same model) may require different settings.

A little tweaking on a Sunday afternoon and you'll find the sweet spot.

KevS · 01-16-2007, 12:09 AM

Quote:

Originally Posted by mad max rr

I few minutes ago i have tried 80 ses, 20 rev and 10 enr.
It´s much better, now i can notice the diference.

That is what I have mine set at as well and I like it, mines a CBR929

MustGoFast · 03-20-2007, 5:26 PM

Quote:

Originally Posted by tdeal28

I have a question or should I say an observation that doesn't really make sense to me with this whole acc. pump thing...

Here it is: On almost all maps from Power Commander and Custom maps that people have had made with bikes that have full systems on them it seems that the maps are Leaned out to gain more horsepower, not enrichened.

While that is true if the latent condition is richer than the optimal burn for your system and fuel (generally true for stock systems to protect the motor, generally richer is safer). If you go to lean you'll make substantially less power just as if you go to rich. Also large fast changes to the ratio will cause a hesitation or stumbling in engine performance as well which as I understand it is what this is trying to prevent.