What is it that you consider to be peak tq? Peak TORQUE, Map, Load?

Reason I'm asking is my car achieves these values at pretty different times. Attached is a 3rd gear graph on Virtual Dyno for reference, and the raw log.

Reason I'm asking is I'm trying to make sure my car is reaching the appropriate timing for peak "tq".

Also note I didn't go 100% throttle until 4500rpms so the spool is rather late, I don't like to build boost so low on a stock bottom end. I also changed my Map-KPA settings to better suite ~33psi since it was only hitting ~260load before.

TPS	RPM	Timing	Speed	Load	AFR	Boost	IAT	WGDC	O2Voltage	IDC
38.0392	3656.25	33	41.0105	68.4	13.913	-2.755	86	0	1.93248	6.24
38.8235	3687.5	30	41.0105	69.6	13.913	-2.5181	86	0	1.93248	6.29333
39.2157	3718.75	29	42.2532	70.8	14.226	-2.2812	86	0	2.12768	6.34667
39.6078	3718.75	29	42.2532	72	14.226	-2.0443	86	0	2.12768	6.34667
40	3750	29	42.2532	74.4	13.9913	-2.0443	86	0	1.97152	7.2
40	3750	29	42.2532	74.4	13.9913	-1.8074	86	0	1.97152	7.2
41.1765	3781.25	27	42.2532	75.6	13.6782	-1.5705	86	100	1.83488	8.06667
42.3529	3812.5	25	42.2532	79.2	13.6782	-1.0967	86	100	1.83488	8.13333
43.1373	3843.75	23	42.2532	80.4	13.013	-0.8598	86	100	1.44448	9.02
48.2353	3843.75	21	42.2532	90	12.8956	0.324699	86	100	1.44448	9.02
55.6863	3906.25	19	42.2532	94.8	12.1913	1.2723	84.2	100	0.95648	10
60	3906.25	17	42.2532	94.8	11.8782	1.7461	84.2	100	0.93696	10
63.5294	3968.75	17	45.9815	97.2	11.5261	1.983	84.2	100	0.60512	11.0067
70.1961	4000	16	45.9815	100.8	11.1739	2.4568	84.2	100	0.5856	11.0933
80	4031.25	15	45.9815	102	11.4869	2.9306	84.2	100	1.1712	11.18
80.7843	4062.5	15	45.9815	103.2	12.4261	3.4044	84.2	100	1.21024	12.1333
81.5686	4093.75	14	45.9815	109.2	12.4261	3.6413	84.2	100	1.3664	12.2267
84.3137	4125	14	45.9815	111.6	12.7391	3.8782	84.2	100	1.3664	13.2
86.2745	4156.25	14	45.9815	110.4	12.7391	4.352	84.2	100	1.32736	13.3
90.1961	4218.75	14	45.9815	114	12.6217	4.8258	84.2	100	1.30784	13.5
93.7255	4250	13	45.9815	115.2	12.6217	5.2996	84.2	100	1.1712	15.4133
96.0784	4312.5	12	48.467	122.4	12.2695	5.7734	84.2	100	1.13216	15.64
96.4706	4312.5	12	48.467	127.2	12.2695	6.4841	84.2	100	0.83936	16.56
96.8627	4375	12	48.467	127.2	11.2913	6.9579	84.2	100	0.64416	17.7333
97.2549	4406.25	12	48.467	132	11.2913	7.6686	84.2	100	0.46848	17.86
97.6471	4468.75	12	48.467	135.6	10.1957	8.3793	84.2	100	0.0976	19.0667
98.4314	4500	10	48.467	145.2	10.1957	9.3269	84.2	100	0.0976	20.16
98.8235	4562.5	10	48.467	151.2	10.1174	10.2745	84.2	100	0.05856	21.4133
99.6078	4593.75	10	48.467	152.4	10.1174	11.2221	84.2	100	0.05856	22.54
100	4656.25	9	48.467	162	10.1174	12.4066	84.2	48	0.05856	23.84
100	4718.75	9	48.467	166.8	10.1174	13.828	84.2	48	0.05856	26.1733
100	4750	8	52.1952	175.2	10.1174	15.0125	84.2	48	0.05856	27.36
100	4843.75	5	52.1952	184.8	10.1174	16.6708	84.2	48	0.03904	29.9667
100	4875	4	52.1952	198	10.5478	18.8029	86	48	0.2928	31.2
100	5000	2	52.1952	214.8	10.587	20.6981	86	48	0.2928	33.0667
100	5031.25	1	52.1952	219.6	11.213	22.8302	86	48	0.62464	35.42
100	5093.75	1	52.1952	237.6	11.2522	24.4885	86	48	0.62464	36.9467
100	5187.5	1	52.1952	246	11.3304	26.1468	86	48	0.66368	38.7333
100	5218.75	1	52.1952	249.6	11.3304	26.8575	86	48	0.66368	38.9667
100	5343.75	2	52.1952	247.2	11.4087	27.8051	86	48	0.70272	41.04
100	5375	3	59.6516	253.2	11.4087	28.042	86	48	0.70272	42.4267
100	5531.25	4	59.6516	253.2	11.4478	28.7527	84.2	48	0.74176	42.48
100	5531.25	4	59.6516	264	11.4869	29.2265	84.2	48	0.74176	43.66
100	5718.75	6	59.6516	259.2	11.4869	29.4634	84.2	48	0.74176	45.14
100	5718.75	6	59.6516	261.6	11.4869	29.2265	84.2	48	0.74176	45.14
100	5875	8	59.6516	261.6	11.4869	30.1741	84.2	48	0.60512	46.3733
100	5937.5	8	59.6516	264	11.1739	30.411	84.2	48	0.5856	46.8667
100	6031.25	9	59.6516	266.4	11.1739	30.411	84.2	48.5	0.46848	48.8933
100	6156.25	10	59.6516	268.8	10.9391	30.6479	84.2	48.5	0.46848	48.5933
100	6218.75	10	68.3508	256.8	10.9391	30.1741	84.2	49	0.46848	49.0867
100	6343.75	11	68.3508	260.4	10.9391	30.6479	84.2	49.5	0.46848	50.0733
100	6375	11	68.3508	258	10.9391	30.8848	84.2	50	0.52704	48.96
100	6531.25	12	68.3508	258	11.1348	31.1217	84.2	50	0.54656	51.5533
100	6593.75	12	68.3508	255.6	11.1348	31.3586	84.2	50.5	0.56608	52.0467
100	6718.75	13	68.3508	260.4	11.1348	31.5955	84.2	50.5	0.5856	51.6
100	6781.25	13	68.3508	260.4	11.1739	31.8324	84.2	50.5	0.56608	52.08
100	6875	13	68.3508	255.6	10.9782	32.3062	84.2	51	0.46848	52.8
100	6968.75	14	68.3508	252	10.9782	32.3062	84.2	51	0.488	53.52
100	7031.25	14	68.3508	250.8	10.9782	32.0693	84.2	51	0.50752	54
100	7156.25	15	79.5355	249.6	11.0174	32.3062	84.2	51.5	0.50752	54.96
100	7218.75	16	79.5355	253.2	11.0565	32.78	84.2	51.5	0.50752	53.9
100	7312.5	16	79.5355	248.4	11.0565	32.5431	86	51.5	0.50752	54.6
100	7406.25	16	79.5355	252	10.7435	32.5431	86	52	0.37088	55.3
100	7468.75	17	79.5355	248.4	10.7435	32.78	86	52	0.37088	57.36
100	7531.25	17	79.5355	250.8	10.7826	33.0169	86	52	0.3904	57.84
100	7625	17	79.5355	246	10.7826	33.2538	86	52	0.3904	56.9333
100	7718.75	18	79.5355	253.2	10.7043	33.9645	86	52	0.35136	57.6333
100	7781.25	18	79.5355	249.6	10.7043	33.4907	86	52	0.35136	59.76
100	7906.25	18	88.2347	250.8	10.6652	33.9645	87.8	52	0.33184	60.72
100	7906.25	19	88.2347	249.6	10.6652	33.9645	87.8	52	0.33184	59.0333
100	7968.75	18	88.2347	248.4	10.6261	33.9645	87.8	52	0.2928	61.2

 

I think that since you are running SD the relationship between load and torque would not necessarily hold as load is an artificial value. Although it seems to corelate pretty well in your case. I guess the better you setup up your VE maps the better it will relate.

From my experience peak load equates to lowest timing unless you are deliberately trying to reduce loads on the engine under spool-up. I would expect that you can increase timing quite a bit in the 5000 rpm range.

 

I kind of thought the same thing since it is SD and "load" is just kind of a calculated value and not the actual load of the engine. My 2D VE map is kind of awkward but I wanted a normal looking fuel map.

If I go 100% throttle at 3krpms, this turbo will hit 27psi@~5000rpms ( if that's what I'm targetting ), and I always understood that as what people refer to as peak tq, which on E85 needs to be anywhere from 0-4*, and this is a 100% stock longblock. I've been running it this way for about 10k miles now. I just keep revisiting the tune and starting over each time so I can practice and refine my skills/techniques.

 

When I had my fp black setup I had it set on a mbc and watched for peak load (airflowperrev on ecmlink, what I'm using), or peak torque. At that point on my bottom end I was around 0-1 degree. I wouldn't go as high as 4 degrees on a bottom end for sure. I was scared at 2-3 degrees. However I was targeting 37-38lbs as my max boost.

An ebc is awesome to help save a bottom end from a smaller turbo and huge torque spike. Once I put that on, it spoiled about 500rpms slower which is exactly how I wanted it setup.

 

Indeed! Before this log I was targeting 400tq at 5k rpms and it would flatline, if you look you'll see my wastegate duty cycle slowly climbing up. I target 27psi then have it taper up to 33-34.