BMW K bikes (Bricks)

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1Back to top Go down    Fuel pressure regulator differences on Thu Jan 16, 2014 4:39 am

Fentible

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In fitting K1100 TB's to my K100, the second handK1100 TB's I obtainedcame complete withan attachedfuel pressure regulator which is a different type to the one already fitted to myK100. The K1100 FPRdoesn't require the vacuum feed from the end throttle bodyso is it possibleto fit it in place of my standard K100 one?? Its purely for cosmetics as the K1100 FPRlooks fairly new againstthe hand painted tar finish(not by me) of my K100 one

I was alsocurious as to why the K1100 FPRdoesn't require a vacuum feed but the K100 one does?

Cheers

Fent

    

2Back to top Go down    Re: Fuel pressure regulator differences on Thu Jan 16, 2014 6:12 pm

klompy the grey brick

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Does it?



and pressure is 35PSI as required.


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KKlompy
1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
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)




    

3Back to top Go down    Re: Fuel pressure regulator differences on Thu Jan 16, 2014 6:43 pm

RicK G

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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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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

4Back to top Go down    Re: Fuel pressure regulator differences on Fri Jan 17, 2014 4:41 am

Fentible

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klompy what can I tell you? my 1984K100 has a vacuum feed to theFPR, maybe later versions are different??

Rick G, I hadn't considered thatthere might be a pressuredifferential 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    Re: Fuel pressure regulator differences on Mon Feb 17, 2014 3:46 am

ReneZ

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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)
BMW K1200GT - 2003 (ZK01223)
    

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