Quote:
Originally Posted by DGajre777
erald01 - As for your original question -
Do I have to use an AFC with my chip?
Generally, yes. Although the changes I make to the Global Fuel and MAS Compensation get VERY close, and make it easier to tune, it is still recommended that you have some tunability, such as an Air-Fuel computer or a GOOD adjustable Fuel Pressure Regulator. In addition, every car is different, so you may require more/less fuel depending on your situation
Basically, if you see knock on your boost gauge (that hopefully you had burned to see knock sum), then either turn the boost down or bump up the fuel pressure.
And if you don't want to use the formula, here are the numbers from the DSMLink manual.
Size (cc/min) Global (%) Dead time (ms)
RC 550 -18% 180
Hahn 625 -18% 180
Denso 660 -31% 180
Denso 720 -38% 450
PTE 580 -16% 180
PTE 680 -30% 210
PTE 780 -40% 315
PTE 880 -46% 330
FIC 650 -31% 315
FIC 750 -40% 315
FIC 850 -47% 315
FIC 950 -53% 315
Or just ask Jeff at DSMChips to burn your chip with the A/F ratio that you want to run (for example 11.5:1 on 93 octane) and you won't need to get a wideband.
The original poster has an AFPR, he won't need to worry about stock fuel pressure regulator overrun.
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Oh ok thats good about the afpr, and I forgot to add the deadtime chart thanks.. Also to the OP yea you can get a set air fuel ratio by Jeff that wont be off much, but I still think its good to have a wideband.... My opinion though...