How to loose 200kgs?....

[Jayme]

8.5 is a bit on the lean side, I normally make it a bit richer in a race car where you are going to be flogging it red hot at full noise for half an hour straight.....

[vlad01]

8.5 is a bit on the lean side, I normally make it a bit richer in a race car where you are going to be flogging it red hot at full noise for half an hour straight.....

power dropped richer than 8.2.

[vlad01]

here is a chart. 8.4 corresponds to 12.7 petrol, exactly where v6 like their AFR for max power with safe mixture. They continue to make the same power up to 13:1 but 12.7 is safer.

Lambda E85 AFR Gas AFR
0.500 4.880 7.350
0.510 4.978 7.497
0.520 5.075 7.644
0.530 5.173 7.791
0.540 5.270 7.938
0.550 5.368 8.085
0.560 5.466 8.232
0.570 5.563 8.379
0.580 5.661 8.526
0.590 5.758 8.673
0.600 5.856 8.820
0.610 5.954 8.967
0.620 6.051 9.114
0.630 6.149 9.261
0.640 6.246 9.408
0.650 6.344 9.555
0.660 6.442 9.702
0.670 6.539 9.849
0.680 6.637 9.996
0.690 6.734 10.143
0.700 6.832 10.290
0.710 6.930 10.437
0.720 7.027 10.584
0.730 7.125 10.731
0.740 7.222 10.878
0.750 7.320 11.025
0.760 7.418 11.172
0.770 7.515 11.319
0.780 7.613 11.466
0.790 7.710 11.613
0.800 7.808 11.760
0.810 7.906 11.907
0.820 8.003 12.054
0.830 8.101 12.201
0.840 8.198 12.348
0.850 8.296 12.495
0.860 8.394 12.642
0.870 8.491 12.789
0.880 8.589 12.936
0.890 8.686 13.083
0.900 8.784 13.230
0.910 8.882 13.377
0.920 8.979 13.524
0.930 9.077 13.671
0.940 9.174 13.818
0.950 9.272 13.965
0.960 9.370 14.112
0.970 9.467 14.259
0.980 9.565 14.406
0.990 9.662 14.553
1.000 9.760 14.700
1.010 9.858 14.847
1.020 9.955 14.994
1.030 10.053 15.141
1.040 10.150 15.288
1.050 10.248 15.435
1.060 10.346 15.582
1.070 10.443 15.729
1.080 10.541 15.876
1.090 10.638 16.023
1.100 10.736 16.170
1.110 10.834 16.317
1.120 10.931 16.464
1.130 11.029 16.611
1.140 11.126 16.758
1.150 11.224 16.905
1.160 11.322 17.052
1.170 11.419 17.199
1.180 11.517 17.346
1.190 11.614 17.493
1.200 11.712 17.640

[Jayme]

yeah thats my point.... different strokes for different folks, but I like keeping it a little power sappingly rich around 12:1 (or E85 8:1) , especially on a race car with the pedal flat for 50 laps at a time. a little power loss is better than overheat or engine damage. for a road car, I would put it exactly where you have it. it depends how I expect it to be driven.

also dyno readings are rarely exactly where the wideband ends up sitting in an open track on a real surface..... take some logs on a track now and see how the readings compare to when it was on the dyno.

[Dylan]

also dyno readings are rarely exactly where the wideband ends up sitting in an open track on a real surface..... take some logs on a track now and see how the readings compare to when it was on the dyno.

Ive noticed that too, road readings end up leaner and varying, Cant beat the real world scenario,

[Dylan]

Looks like lots of work going on here. No fault codes so got all the flags set right.
Are you using VE learn? VE map is very choppy. Power might of been dropping off due to the very lean readings up high rpm.

I've done a quick change here don't feel pressured to use it just a thought, Few VE changes from the logs. Id smooth out the VE and take some more logs..
Also on the power mode spark table I done up another one. The late model tunes have some very weird timing maps. I done one more like the older ones which I think do work better.

All that hunting is that the dyno doing that or is it the engine?

[vlad01]

Looks like lots of work going on here. No fault codes so got all the flags set right.
Are you using VE learn? VE map is very choppy. Power might of been dropping off due to the very lean readings up high rpm.

I've done a quick change here don't feel pressured to use it just a thought, Few VE changes from the logs. Id smooth out the VE and take some more logs..
Also on the power mode spark table I done up another one. The late model tunes have some very weird timing maps. I done one more like the older ones which I think do work better.

All that hunting is that the dyno doing that or is it the engine?

we only had 2 half runs on logging and used VE calc, and few runs doing the timing

Stuffed around a lot with trying to get it to idle. it hunts a lot but better than it stalling before. I found that it hunts as there is a lag between IAC opening and the idle coming up so it goes into a loop. Open the buterfly with the screw until the IAC is closed and it idles sweet!

Is there a parameter to adjust the allowable IAC step range when it aims for a target idle? If I could narrow the range it wouldn't hunt.

The hunting is the cause of some of those VE spikes you see, probably from fuel condensations being drawn off the manifold when it cycles. I was playing around with closed throttle VE and it didn't help. later that night at home it clicked in my head that a flag must be set to use that table

[Gareth]

Wow, thanks dylan, we'll certainly give it a go

I think we need to hit the dyno again really soon.

I really dont care too much about idle, never gets to spend much time doing that...

[Dylan]

There is some sag mode and dead band settings for IAC. In this case id smooth the VE at 800rpm 40kpa areas and log from there no closed throttle VE or learn. The logs show way rich and lean but the wide band reading can be a bit laggy at idle too. Did you start with stock V6 VE table?


Saying that do you think I can get my own car to bloody idle? Thinking something mechanically might be out. Bloody thing just hunts once warm. I've tuned dozens of V8's some heavily worked others stock. This bloody thing ported heads stock ported intake 284 cam. Don't kwow why it's so hard.

[Gareth]

The VE was from the 11p package.

Loving this, my learning is in overdrive atm..