[Mk2] [Turbo] New forged engine will not idle TOOO RICH !

[george_m]

Power Fc with datalogit, JE pistons,HKS 264 exhaust and 272 inlet cams that I degreed to 103 and 110 deg, I expected the idle to be a bit rough but this is so lumpy and rich. I also have an ATS uprated fpv which was ok on my 540 injectors.
It starts up fine and blips up ok
Sard injectors 800 set to 67.5 % and 0.56ms but cannot get it to idle and its running pig rich.

Altering the fuel injector settings makes no difference even if I set them to 60% Did a sensor check all looked good apart from wideband o2 so have disabled it via datalogit but its still rich. I checked all the vacuum pipes and all looks well cannot see anything obvious

Any ideas guys as I want to book a mapping session but I don want to wash down the bores

[3S Service Centre]

book a mapper that will come to you house.
James

[Kongaroo]

If you are using Sard 800cc low impedence injectors (part number 63517) then you will want a much lower lag time of 0.19ms in your power fc injector lag box when replacing the stock 540cc injectors on a rev 3 turbo.

Putting too high an injector lag number can cause the engine to run rich because you are telling the powerfc that your new injectors take a lot longer to open than they actually do.

You could also check that you haven't altered your base fuel pressure as injectors will flow higher CC at higher fuel pressures.

[george_m]

All good now thanks guys I forgot the fuel pressure was increased with the ATS FPRegulator, I have now reset them and corrected the lag times.

I did my first gentle road test yesterday and then booked a remapping session for next Tuesday so will need to put a few more miles on the clock first
javascript:emoticon(':)')

[Kongaroo]

Glad to hear you got it sorted. Good luck at the dyno and don't forget to post your results