ewainwright

Another Sunday afternoon trying to get her to idle without stumbling and stalling.

When I remove the 1.8k from the line going to the oxygen sensor my air/flow readings swing between 12.4 and 16.34 in cell 305 Is anyone else experiencing this? Is this normal? Thanks in advance

pk951

I'm curious to know how you are tuning your'e car with stock 02 sensor?

From what i know that 02 sensor is not made to dialing in your'e af ratio very in-acute.

I tried that with MY Swiss's car we thought we had ar ratio Farly close, but when he got to dyno ar was way off.

ewainwright

The Serial Link allows you to hook up your laptop to the Link Module. This allows you to capture information as RPM, MAP, TPS, OXY, AFM, VECU, GAIN and ZON. With this information I am able to calculate the MAP's zone (load and boost) and the airflow ratio. Ultimately, you are correct in that I have to go to a dyno to find out how accurate this information is.

However, several owners stated that they were able to minimize the off throttle stumble and the occasional stall. I guess that these issues bother me more as I spend a good part of my daily commute in stop and go traffic.

I was warned not to spend too much time (which equals money) at the dyno as these issues will not go away. So, as a direct result, I am doing my best to try to minimize these issues before I go and spend my hard earned money.

rpm map tps oxy amf vec gain zon map zone psi AFM
2673 103 190 71 0 159 150 101 625 0.29 13.0141
3115 108 190 69 0 170 160 102 630 1.015 13.1079
3578 121 191 65 0 181 179 119 735 2.9 13.2955
4136 128 191 74 0 203 196 120 740 3.915 12.8734
5558 180 191 82 0 252 250 139 855 11.455 12.4982
6225 188 190 84 0 255 255 140 860 12.615 12.4044
5103 38 26 50 0 119 91 42 250 -9.135 13.999
3436 116 156 3 0 186 178 103 635 2.175 16.2033
3936 128 191 75 0 197 189 119 735 3.915 12.8265
4259 154 191 81 0 213 212 120 740 7.685 12.5451
4572 176 191 85 0 232 227 137 845 10.875 12.3575
4908 192 191 87 0 242 239 137 845 13.195 12.2637
5291 192 191 89 0 248 246 138 850 13.195 12.1699
5651 198 191 90 0 253 251 139 855 14.065 12.123
5967 192 191 91 0 255 253 140 860 13.195 12.0761
6299 192 128 93 0 255 255 140 860 13.195 11.9823
4889 26 29 82 0 59 41 41 255 -11.46 12.4982

this is an actual example of what the information looks like (first to second). Please don't use this as an endorsement of the system. The turbocharger is great. However, I could use some help in getting this sorted out better. Thanks in advance for anyone's help. ed

Dwayne Williams

Did you see this thread -> Tuning the Link MAP

OZ951 provided some really good info on working with the LINK and the serial logger. Read through the whole thread - there's some excel sheets that will help you plot out the data from your serial link.

I'm going to be going through all my MAP settings again in a couple of weeks after I install a few new toys.

ewainwright

Dwayne Williams

Thank-you for your response. I read the tread and was a contributer to it (excel spreadsheet) Several have asked for it and I sent it to all that asked that I know of. That is where I got the 1.8k.

However, my question is this. With the 1.8k resistor removed my air/flow swings (as it should). However, according to my data log, in cell 305 I see a swing from 12.75 up to 16.75. Is this normal as I think that this is the reason for my uneven idle. In addition, I am concern about the lean 16.75 I will be going to MA that has an emissions test. Thanks in advance.

B951S

Ed
Mine is the same, with the o2 sensor in closes loop it swings about the same as you are describing, does not runas well in part throttle either. I find to run half decent in closed loop the base settings have to be on the rich side. I would say get it running hald decent in closed loop, pass the test (good luck) and then pop the resistor back in....Let us know how the test goes.

Bengt Sweden

af meaning air/flow or air to fuel ratio?

If you have a swing there probably is some control system in work. Either your lambda sensor is not switched off (double check) or the idle control is still moving (idle switch).
Just guessing.
Bengt

Bengt Sweden

Sorry for not reading carefully enough.
I assume you mean with the lambda sensor actuated.

Cell 305. Isn't that with load 3 and rpm 500-1000? With low rpm you will have a swing. That's how it works.
Bengt

Dwayne Williams

Oops - I guess I should re-read that thread. Sorry about that.

ewainwright

Thanks Guys

By the way you're right, I meant air/fuel. What the hell was I thinking.

B951S - What is your air/fuel ratio in cells 205, 305, and 405 to get your Baby to run decent with the 1.8k resistor in? Thanks in advance ed

B951S

e.w.
You have mail....Hope this helps