oem I5t Injector Duty Cycles ?

[macspring]

Would anyone be able to fill in some of the gaps ?

Just curious on the duty cycles of the injectors below.


1. ABY Injectors - Standard Chip = ? %

2. ABY Injectors - Chipped Chip - ? %


3. ADU Injectors - Standard Chip = ? %

4. ADU Injectors - Chipped = ? %


Any comments welcome.

Thanks.

[UrS4boy]

How high is the sky?

Duty cycles are a function of the load and the particular software (and related hardware). I think the goal is to keep the max duty cycle less than 90%. Obviously prj has the real answer.

[andy10v]

A log of RS2 injecotr duty cycle on a chipped RS2 setup

http://www.s2forum.com/forum/showthread.php?p=607149&highlight=duty+cycle#post607149

full boost (1.8bar) and it holds 1.5bar´ish to the redline.

Injectors are maxed, yeah.
The formula is (IPW+Lagtime)*RPM/1200 when using values from VAG-COM.
This is because Motronic outputs the desired actual injector opening time to VAG-COM, without taking lag time into account, which it adds later.
The lag time for RS2 injectors at 13.25 volts is 0.58ms (as it is set in the Motronic ECU).

Here is the output from your car with the injector duty cycle added:

RPM	Inj. On Time	IDC	Voltage
			
 /min	 ms	%	 V
720	2.21	1.67	13,74
680	2.47	1.73	13,60
760	2.34	1.85	13,74
720	2.34	1.75	13,74
720	2.34	1.75	13,74
720	2.34	1.75	13,53
720	2.21	1.67	13,80
760	2.34	1.85	13,67
840	7.02	5.32	14,01
1720	3.9	6.42	13,74
1600	4.29	6.49	13,74
1480	4.94	6.81	13,46
2120	5.72	11.13	13,74
2880	6.24	16.37	13,67
3720	5.85	19.93	13,74
3360	1.04	4.54	13,46
2440	5.59	12.55	13,74
2480	6.5	14.63	13,74
2800	7.02	17.73	13,67
3200	7.93	22.69	13,74
3640	10.92	34.88	13,60
4280	12.61	47.04	13,46
5000	20.67	88.54	13,40
6000	18.07	93.25	13,33
7080	16.25	99.30	13,33
5720	8.71	44.28	13,40
5440	19.63	91.62	13,33
5880	18.59	93.93	13,26
6320	17.42	94.80	13,26
6760	16.25	94.81	13,46
6400	1.04	8.64	13,74
5560	15.34	73.76	13,40
5760	18.85	93.26	13,40
5960	18.2	93.27	13,40
5480	1.04	7.40	13,67

That's why I keep telling people RS2 injectors are too small
Running anything over 90% is generally a bad idea, because if for any reason at all there is a boost spike, there won't be enough fuel.
Also, there is not enough injector room here for any knock enrichment. If you knock, it will just flatline and keep knocking.