RazorLab

iTrader: (8)

1,000c EGT? Good god. Where is the probe located?

Rob W.

iTrader: (8)

So when you guys say it's better to run it rich, what are talking about? On Michigan's 93 octane, I've been targeting 11.3-11.5 at ~22psi peak. Is this reasonable?

When the weather is a bit warmer, I think it's more like 10.9-11.1 @20psi (less air due to less boost due to MBC not compensating for warmer weather).

nj1266

iTrader: (6)

My experience with my car shows that a lean mixture (within the octane limits, ofcourse) is better than a rich mixture even when you have to retard timing to reduce knock.

I had a 91 octane custom tuned map and I logged its results on 93 octane to get a baseline. Then I leaned out the mixture to optimize the map for 93 octane. I leaned the map mostly in the 5000+ rpm. I also backed off the timing in the entire rpm range. I retarded timing by about 1* in the 6500-7000 rpm range and by 2* in the peak boost/torque are.

Then I went out and logged again on the same piece of road at around the same time of day. I compared the results in Dataloglab dyno. You will notice that my car lost a bit down low since I had to pull 2*. But the car gained a lot from leaning up top even though I pulled timing to achieve that lean mixture.

cij911

iTrader: (14)

NJ1266 -- Given that you have the dyno data, why did you not just richen the map in the low end and then lean in the upper end? It looks like you would have created a flatter TQ curve and and created more area under the power band.

So back on topic -- What is the best way to richen the evo? I guess you need to know which load cell your hitting...I am getting some knock in the 3800 - 4200 range (right in the peak boost area) and the car is pulling timing. Thoughts / advice?

RPM, TPS, ISCStep, Knock Sum, Timing, Load Max1, Load Calc, Speed

2468.75 21.56862745 66 0 39 35.625 37.25 27.3403328
2468.75 21.17647059 66 0 39 34.375 27.14 28.5830752
2437.5 23.92156863 71 0 39 38.75 52.34 28.5830752
2500 49.01960784 76 4 22 91.875 98.66 28.5830752
2468.75 94.90196078 76 4 20 103.125 109.07 28.5830752
2562.5 100 76 4 17 111.875 118.55 28.5830752
2593.75 100 76 4 15 120.625 126.77 28.5830752
2625 100 76 4 12 129.375 136.31 28.5830752
2687.5 100 76 3 10 140.625 144.42 28.5830752
2781.25 100 76 3 10 151.25 159.55 28.5830752
2843.75 100 76 3 10 159.375 178.37 28.5830752
2937.5 100 76 3 9 159.375 198.7 31.06856
3031.25 100 76 3 8 159.375 225.9 31.06856
3156.25 100 76 3 5 159.375 258.19 31.06856
3281.25 100 76 2 4 159.375 275.17 31.06856
3406.25 100 76 4 4 159.375 264.04 36.0395296
3593.75 100 76 4 5 159.375 260.22 36.0395296
3687.5 100 78 4 5 159.375 260.22 36.0395296
3875 100 79 4 5 159.375 252.8 36.0395296
4031.25 100 81 3 7 159.375 251.38 36.0395296
4156.25 100 84 3 7 159.375 251.27 43.495984
4312.5 100 87 3 7 159.375 249.98 43.495984
4406.25 100 89 3 7 159.375 249.87 43.495984
4562.5 100 93 3 7 159.375 253.43 43.495984
4718.75 100 96 2 7 159.375 257.1 50.9524384
4875 100 99 2 7 159.375 249.76 50.9524384
5000 100 104 2 8 159.375 243.89 50.9524384
5156.25 100 120 2 8 159.375 242.83 50.9524384
5281.25 100 120 2 9 159.375 238.07 50.9524384
5437.5 100 120 1 9 159.375 243.24 58.4088928
5593.75 100 120 1 10 159.375 240.84 58.4088928
5718.75 100 120 3 10 159.375 240.84 58.4088928
5875 100 120 3 11 159.375 238.41 58.4088928
6031.25 100 120 3 11 159.375 233.2 65.8653472
6156.25 100 120 2 11 159.375 229.38 65.8653472
6281.25 100 120 2 12 159.375 223.05 65.8653472
6406.25 100 120 2 12 159.375 223.05 65.8653472
6562.5 100 120 2 11 159.375 220.38 65.8653472
6687.5 100 120 2 12 159.375 217.91 73.3218016
6781.25 100 120 1 14 159.375 216.59 73.3218016
6937.5 100 120 1 15 159.375 216.71 73.3218016



So I am hitting like 23 psi and then holding and then tapering. Do you think the boost is too high (I doubt it) or are my target AFRs in the load table just a little too lean in the 3800 - 5500 range? Also, I have to check how accurate the SPEED calculations are and how it is calculating (wouldn't the ECU need to know which gear I am in????)?

THANKS!!!

cij911

iTrader: (14)

Would running richer lower boost? I made some changes today and seem to be running like 1 - 1.5 psi lower than before...Thanks

SophieSleeps

iTrader: (19)

So based on your dyno charts, would it make sense to say that perhaps it'd be best to run 11 - 11.5 at low RPM in boost and as you go up in RPM to run leaner but pull more timing?

Sort of the best of both your Dyno runs.