BMW K bikes (Bricks)

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1Back to top Go down   Fuel pressure regulator differences Empty Fuel pressure regulator differences on Wed Jan 15, 2014 1:39 pm

Fentible

Fentible
Silver member
Silver member
In fitting K1100 TB's to my K100, the second hand K1100 TB's I obtained came complete with an attached fuel pressure regulator which is a different type to the one already fitted to my K100. The K1100 FPR doesn't require the vacuum feed from the end throttle body so is it possible to fit it in place of my standard K100 one?? Its purely for cosmetics as the K1100 FPR looks fairly new against the hand painted tar finish (not by me) of my K100 one

I was also curious as to why the K1100 FPR doesn't require a vacuum feed but the K100 one does?

Cheers

Fent

    

2Back to top Go down   Fuel pressure regulator differences Empty Re: Fuel pressure regulator differences on Thu Jan 16, 2014 3:12 am

klompy the grey brick

klompy the grey brick
VIP
VIP
Does it?

Fuel pressure regulator differences Ductin11

and pressure is 35PSI as required.

Fuel pressure regulator differences Gauge11


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KKlompy Fuel pressure regulator differences 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Fuel pressure regulator differences Au-log10


    

3Back to top Go down   Fuel pressure regulator differences Empty Re: Fuel pressure regulator differences on Thu Jan 16, 2014 3:43 am

RicK G

RicK G
VIP
VIP
I think you will find that the Motronic injection runs 3 bar pressure where the L Jetronic runs 2.5 bar so you would run rich because the pressure would be too high.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

4Back to top Go down   Fuel pressure regulator differences Empty Re: Fuel pressure regulator differences on Thu Jan 16, 2014 1:41 pm

Fentible

Fentible
Silver member
Silver member
klompy what can I tell you? my 1984 K100 has a vacuum feed to the FPR, maybe later versions are different??

Rick G, I hadn't considered that there might be a pressure differential between the two types. Oh well it was just a thought and maybe something I can reconsider if the bigger TB's produce lean results.

Thanks both

Fent

    

5Back to top Go down   Fuel pressure regulator differences Empty Re: Fuel pressure regulator differences on Sun Feb 16, 2014 12:46 pm

ReneZ

ReneZ
Life time member
Life time member
Don't forget you're talking about different systems of FI. The L-Jetronic only gets info about the fuel demand from the AMM. The Motronic system gets it from the TPS (or at least has that signal to work with as well). My understanding is that the vacuum line is there to ensure the pressure of fuel injected is constant relative to the pressure in the TB's to allow for correct atomisation (ie have the injectors work optimal).
The bike will run without it, but not as intended. Its a bit like taking the TPS off on the earlier bikes. They can run great, but your missing some of the intended features.


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Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Fuel pressure regulator differences Rain
BMW K1200GT - 2003 (ZK01223)
    

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