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Title: AFR problem on 2.7T with K04 and 600cc injectors Post by: kaross on November 24, 2014, 12:18:49 PM Hello!
I have read much, much info here and learned many things. Thanks to all the users. But now I have problem which I don't understand. First of all car has many mods: 2.7BiTurbo with RS6 turbos. 600cc @ 3bar injectors Ported 2.8N/A heads with 2.8 cams, freeflow intake, but with stock MAF. Custom exhaust manifolds, Exhaust pipes e.t.c. 4B0907551D 350070 software. Deleted EGT sensors, N249. My calculated KRKTE is 0.04973. Stock 0.09768. 4bar fpr. So injectors run 690cc @ 4bar. Basic problem is AFR. At low loads, low rpm AFR is good. But at higher rpm over 4000 it goes really rich. With stock maps over 10. Fuelling I am tuning through FKKVS and KFKHFM. And in each higher gear it goes more and more richer. For example First is good, Second after 6000rpm goes rich. 3rd gear after 5000rpm goes to 10-11 AFR. 4th gear 4000RPM almost 10. 6th gear isn't driveable at WOT. I am tuning KFKHFM map even -20% from stock at high RPM and high Loads to get "normal"AFR (~11,6-12) Also FKKVS -15-20% from stock at 14-16ms. Anybody could tell me why it is happening? We measured fuel pressure. At idle 3,8bar. At 0bar boost ~4,1bar. Full boost (1,5bar) it is 5,5bar. Boost is stable. Ignition stable - no knocking, no retarding. There is somekind of problem. I talked to pro tuner and he told me that he never tune more than +/-5% KFKHFM even with 600cc injectors exactly these engines. Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: nyet on November 24, 2014, 12:21:58 PM BTS
Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: kaross on November 24, 2014, 01:53:33 PM excuse me, but I don't understand this abbreviation.
Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: aef on November 24, 2014, 02:11:56 PM BTS Bauteilschutz in English is Part or hardware Protection
http://s4wiki.com/wiki/Tuning#LAMBTS Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: ddillenger on November 24, 2014, 02:19:26 PM Needs logs of actual vs request.
Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: kaross on November 25, 2014, 12:45:47 AM What actual vs request?
KFLBTS is set to 0,82 at high Loads and RPMs. Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: nyet on November 25, 2014, 12:52:54 AM What actual vs request? requested AFR and wb output Please accompany any help requests with actual logs. Title: Re: Post by: technic on November 27, 2014, 03:45:46 PM Tune your fueling using BTS and LAMFA instead. Use FKKVS for fixing lean or rich spots.
Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: kaross on November 28, 2014, 04:38:45 PM requested AFR and wb output Please accompany any help requests with actual logs. where I can see requested AFR? or what variable should I log. Title: Re: AFR problem on 2.7T with K04 and 600cc injectors Post by: technic on November 29, 2014, 04:42:22 AM Read LAM*** in ME7.5 FDEF document. You are looking for lambts_w and lamfa_w. Or perhaps lamvoa_w.
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