single turbo fd3s

[flying_fitter]

Im having a bit of trouble with my newly converted single turbo,have got a wideband plugged in and when at idle im getting a/f ratios really rich like 11s when i try to reduce the fuel in the cells on tickover it never seems to respond as it should, ive gone back to running standard injectors with uprated fuel pump and aftermarket fpr am i missing something on my apexi that needs switching on/off? Sequential control is off already  Does any body have the a/f figures on a standard fd so i can compare?Had it three years now and still never driven it on the road!!!!!:2Mad

[rx7veilside]

fds run extremely rich at idle and 11.5 etc isnt unheard of

[Fats]

Mine sit\'s round 12 on tick over when warm, it\'s around the 10\'s when it\'s cold.

You should have no problem driving it just resist the temptation to boost until ya can get it mapped.

[kbareham]

Mine starts up at 11\'s, but leans off when warm. Against common opinion, mine would happily idle at 14.3 without misfiring when warm. It was a big single with stock 550 primary injectors and stock porting. If you didn\'t mind an occasional misfire, it would go leaner - 14.6 was possible.

Two points:

1) If you get it that lean, you need to add a lot of throttle enrichment to get it to come off idle cleanly. You need something like double the default pfc values at 1000rpm

2) I found it impossible to reduce the fuel past a certain point. This didn\'t cause a problem at idle for me, but on the over-run I was getting 11\'s when I wanted 13\'s in the lower cells. Reducing fuel in the appropriate cell didn\'t make any difference. It seems to hit a minimum at about 1.5-1.8 mS (I can\'t remember the exact value).After that, reducing the number makes no difference.
I added a lot to the lag time to the injector settings  (- 0.5). You this leans it a little, so you need to correct all cells in the map by adding 0.5mS. This will take you back to about where you started but will allow you to reduce the minimum injector time by 0.5mS from the previous minimum.


Other than that, check the fuel pressure!

Keith

[flying_fitter]

Thanks for the replies at least i know its not massively different!!Will double check fuel pressure again today and see what happens.
What on the apexi is considered a usuable amount of knock on the level indicator,im trying to work out if its knock or just exhaust popping banging causing "ghost" knock?

[kbareham]

The PFC will flash the dash light at 60 as a warning. I\'ve just checked my last datalogit log, it peaked at 20.
Some people have reported readings well over 100 without engine damage. There seems to be an opinion that the knock sensors can lie, but mine seems to give reading that align with changes to the ignition timing. When I have had slightly high readings, a couple of degrees out of the timing in that cell often brings the knock down.

Keith

[flying_fitter]

Thing is the "knock" is happening when the engine is under no load! got some det cans today so gonna try a few points on the engine and see if that helps at all,Thanks for the help ill let you know what happens
 
Mat