Help with Delivered Torque
02-06-2004, 08:59 PM
#1
Help with Delivered Torque I've used two different methods to street tune the car:
A ) Leave the HOT stock, and adjust PExRPM by 99% until I get knock, then raise it in the offending RPM range by 1% until the KR disappears. Continue until all PExRPM ranges have been completed. I did not touch WOT timing at all.
B ) Starting with my dyno tune, I reviewed the AFR graph and adjusted the PExRPM in a few RPM ranges by 1% to get them closer to 13:1 across the RPM range. I then multipled the PExRPM table by 102% to richen it to an estimated 12.6 to 12.8:1 on the dyno. I then added timing in 2400-2800 .52-.72, 3200-4400 .4-.84, and 4400-8000 .52-1.0 until I got knock then dropped it back until it was gone in the respective cells. I have my WOT enabled at approximately 20% TPS, btw.
I've been told that the Delivered Torque PID does not generate accurate numbers - but that it does show relative gains and losses. To that end, I logged one run with (A) tuning, and two runs with (B) tuning. The results are as follows:
It's about the same up until 3500, then it starts to separate. I did not have samples for the blank entries. For some reason I was having a hard time creating an Excel chart with RPM on the x-axis and TQ on the Y-axis, and having it plot both results on it.
I tried tuning method "B" because others had tried method "A" and found themselves very lean when they went to a dyno. They said that even w/o KR they were running very lean.
Comments & thoughts on the differences? Does tune A really make an additional 20+ torque above 6200?
A ) Leave the HOT stock, and adjust PExRPM by 99% until I get knock, then raise it in the offending RPM range by 1% until the KR disappears. Continue until all PExRPM ranges have been completed. I did not touch WOT timing at all.
B ) Starting with my dyno tune, I reviewed the AFR graph and adjusted the PExRPM in a few RPM ranges by 1% to get them closer to 13:1 across the RPM range. I then multipled the PExRPM table by 102% to richen it to an estimated 12.6 to 12.8:1 on the dyno. I then added timing in 2400-2800 .52-.72, 3200-4400 .4-.84, and 4400-8000 .52-1.0 until I got knock then dropped it back until it was gone in the respective cells. I have my WOT enabled at approximately 20% TPS, btw.
I've been told that the Delivered Torque PID does not generate accurate numbers - but that it does show relative gains and losses. To that end, I logged one run with (A) tuning, and two runs with (B) tuning. The results are as follows:
Code:
RPM Tune B Tune A 1500 572 1600 569 1700 569 1800 577 1900 582 2000 578 2100 575 2200 572 2300 563 2400 558 2500 560 2600 564 567 2700 572 570 2800 574 572 2900 585 580 3000 592 585 3100 600 595 3200 609 602 3300 618 618 3400 625 626 3500 637 631 3600 639 646 3700 640 642 3800 643 645 3900 640 648 4000 638 643 4100 636 643 4200 637 637 4300 639 638 4400 635 640 4500 670 645 4600 649 646 4700 650 662 4800 648 656 4900 648 651 5000 635 641 5100 635 641 5200 626 632 5300 622 632 5400 618 624 5500 623 629 5600 606 623 5700 613 618 5800 610 609 5900 597 599 6000 582 593 6100 565 581 6200 550 568 6300 544 570 6400 527 560 6500 522 543 6600 506 6700 433 6800 Total 24463 24651
It's about the same up until 3500, then it starts to separate. I did not have samples for the blank entries. For some reason I was having a hard time creating an Excel chart with RPM on the x-axis and TQ on the Y-axis, and having it plot both results on it.
I tried tuning method "B" because others had tried method "A" and found themselves very lean when they went to a dyno. They said that even w/o KR they were running very lean.
Comments & thoughts on the differences? Does tune A really make an additional 20+ torque above 6200?
02-06-2004, 09:36 PM
#2
