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 Afr leaning out in top gear 
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Joined: Tue Aug 20, 2013 3:22 am
Posts: 32
Gday ,
Thought id put up two shots of the run last weekend, there is one there with a single dark blue line, that is afr after upping the fuel pressure from around 8.5 psi up to around 9, and changing to the blp nailhead 150 thou tit needle and seats.
Other picture is both this later run as well as the previous meeting.
You can see it doesnt step lean nearly as much on the 2.3 change.
Apologies for the poor quality of pictures.
Where previously afrs were hitting 14.0 after the gear change it is now down to 13.0 or so mark.
It seems to pull richer at the end of 2 nd and 3rd gear.
This would suggest i have enough fuel into the bowls now?
How do i get the part of the curve after the change to come down richer and be more of a flat line?
If i put a bigger hi speed bleed in it wont it tilt the line further down rich at the end of the gear?
What result will putting more main jet in? Will that richen the whole curve?
Would be nice if could richen that area around 6000 - 6300 up without fattening up the bottom which is fat enough?
Did try a bit more fuel pressure again but all it did really was to fatten up the bottom and the top 3nd in 2 nd and 3rd gear virtually overlayed itself on the graph.
Im thinking this is where tuners e holes may come into play?
Cheers and thanks very much

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20170513_113746_resized.jpg [ 297.35 KiB | Viewed 67 times ]
Thu May 18, 2017 6:09 am
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