Please post

[James Boughton]

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Michel,
	Here is my guess (and believe me I am guessing).  On typical gasoline =
injection cars there is a function which decreases the pulsewidth for a =
short period of time on open to closed throttle transitions.  This is to =
keep the engine operation near stoichiometric while the puddled fuel in =
the intake manifold gets sucked into the engine.  With the LPG fuel =
there is no puddling and the decrease in pulsewidth is actually forcing =
the engine lean causing the bump your friend is feeling.  As I am not =
familiar with the control system of the 730i or LPG fuel I am shooting =
in the dark, but there is my explanation :-)

Jim Boughton
boughton at bignet.net
Owner - Boughton Engine Systems Technology (B.E.S.T.)

----------
From: 	Mpotheau at aol.com[SMTP:Mpotheau at aol.com]
Sent: 	Tuesday, June 24, 1997 6:16 AM
To: 	DIY_EFI-Digest at coulomb.eng.ohio-state.edu
Subject: 	Please post


A non English speaking friend of mine is having problems with his BMW =
730i.
 The car is far, far away and I cannot reach out and touch it.  I am not
familiar with how the conversion was done, it has kindly been described =
as
butcherwork.  The car runs on both LPG and Gasoline (one at a time).  =
The
reason for this is obvious- cost of LPG is about 1/3 of gasoline.

Car runs fine on gas, no problems of note.  On LPG the car does not
decelerate smoothly, sorta a reverse hesitation when lifting off the
throttle.
mpotheau at aol.com
Michel Potheau


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