Need fast help with mixture/ignition problem
08-21-2004, 12:40 PM
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Need fast help with mixture/ignition problem
hallo,
today i corrected my base ignition from 18° BTDC to 15° BTDC because i don't had a timing light until now.
the mixture was overall correct befor the change 12,5:1 under full boost and 14,7:1 in the crousing area of the fuel map. so everything fine.
but after the timing change my mixture if completely bullshit. it is a bit too lean (15,5:1) under part throttle, nearly 14:1 until 2-3psi of boost and over 3psi it leans out dramaticaly at 15:1 i go off the throttle but i think it would go leaner if i would stay on the throttle...
now my question: could the timing change make such a BIG difference in fuel mixture or is this impossible and something else has a problem?
Greets
Malte.
today i corrected my base ignition from 18° BTDC to 15° BTDC because i don't had a timing light until now.
the mixture was overall correct befor the change 12,5:1 under full boost and 14,7:1 in the crousing area of the fuel map. so everything fine.
but after the timing change my mixture if completely bullshit. it is a bit too lean (15,5:1) under part throttle, nearly 14:1 until 2-3psi of boost and over 3psi it leans out dramaticaly at 15:1 i go off the throttle but i think it would go leaner if i would stay on the throttle...
now my question: could the timing change make such a BIG difference in fuel mixture or is this impossible and something else has a problem?
Greets
Malte.
08-21-2004, 12:50 PM
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Re: Need fast help with mixture/ignition problem (JAY)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JAY »</TD></TR><TR><TD CLASS="quote">whats your setup?
Engine managment?</TD></TR></TABLE>
8psi maximum boost
engine management is standalone
additional in line fuel pump
300ccm injectors
but what does this metters? my questions is if a changing in base timing can make such a big difference in af mixture without a change of fuel and ignition maps.
ahh, by the way, closed loop is disabled so nothing effects the mixture.
Greets
Malte.
Engine managment?</TD></TR></TABLE>
8psi maximum boost
engine management is standalone
additional in line fuel pump
300ccm injectors
but what does this metters? my questions is if a changing in base timing can make such a big difference in af mixture without a change of fuel and ignition maps.
ahh, by the way, closed loop is disabled so nothing effects the mixture.
Greets
Malte.
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