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maad914 maad914 is offline
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Join Date: Jul 2005
Location: Finland, Mäntsälä
Posts: 19
3.2 engine in track car getting lean after 10 min.

Hi all
I have a problem which seems hard to solve.
I'am racing my car in Roadsport track class in Finland.
Last weekend in our 3th and 4th race i had problems with engine as it started to go lean after 10-12min. hard driving. Datalog shows nothing changing but after about 10min. lambda curve starts to drop and it is in a bottom after another minute.
Engine is otherwise stock but the FI is programmable, heads have been worked and headers are homemade.
According to datalog, intake air temp max is 42c and oil max 92c.
Fuel pump capasity is about 120liter/hour and it is measured with back pressure.
Engine was fine in dyno about year ago but now it does this.
I think lambda metering is fine because sparks shows that really goes lean.
There is small differences in spark plug colors but nothing major.

Any idea's and help would be more than wellcome.

Thanks
Mika

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porsche 914 3.2
Old 07-20-2005, 11:53 PM
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