Fuel Injector Deadtimes

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Every fuel injector type has a unique minimum injection time and latency for it to fully open since energized.

This latency is often referenced as injector lag- or deadtime, latency or delay (ip_ti_add_dly__vb).

It is strongly dependant on the supply voltage and therefore stored in an interpolated table.

The minimum injection time is also important to make sure the injection pattern is clear and complete. (c_ti_min_iv). Minimum injection time is calculated by subtracting the dead time at 14v from the minimum pulse width.

All values here are meant for the standard fuel pressure of 3.5 bars (50,76 psi), except otherwise defined.

ATTENTION: The conversion factor of the known XDF files are wrong. Correct conversion is "X * 0.032", giving a range of 0.00ms to 8.16ms.

BMW M52TU OEM injectors

Minimum injection time M52TUB20: 0.640ms

Minimum injection time M52TUB23/28: 0.624ms

kf_ti_add_totz__ub
V ms
0.0 3.65
6.0 3.65
8.0 1.84
10.0 1.23
12.0 0.81
14.0 0.55
16.0 0.39
25.0 0.06

BMW M54B30 OEM injectors

Flow rates @ 43.5 psi / 3 bar: 22.5 lb/h; 170g/m N-Heptane, 236cc/m

Minimum injection time: 0.725ms

ip_ti_add_dly__vb
V ms
0.0 4.44
6.0 4.44
8.0 1.88
10.0 1.15
12.0 0.77
14.0 0.51
16.0 0.34
25.0 0.04

Bosch 0280150945 320cc/min 30lb/hr "Red-tops"

Minimum injection time: 0.496ms

ip_ti_add_dly__vb
V ms
0.0 3.33
6.0 3.33
8.0 1.41
10.0 0.86
12.0 0.58
14.0 0.38
16.0 0.26
25.0 0.03

Bosch 0280155968 440cc/min 42lb/hr "Green giants"

Bosch 0280155968 Injector

39.15 PSI/270 kPa:

Minimum injection time: 0.468ms

ip_ti_add_dly__vb
V ms
0.0 4.986
6.0 4.986
8.0 2.098
10.0 1.321
12.0 0.919
14.0 0.670
16.0 0.47
25.0 0.47

(Same values apply to Bosch 280150558 green-tops (Ford Part# M-9593-F302)

Siemens 6900371 440cc/min 42lb/hr -VOLVO Turbo Injectors-

Minimum injection time: 0.501ms

ip_ti_add_dly__vb
V ms
0.0 4.44
6.0 4.44
8.0 1.88
10.0 1.15
12.0 0.94
14.0 0.85
16.0 0.77
25.0 0.04

Bosch 0280158123 627cc/min

Bosch 0280158123 Injector

Minimum injection time: 0.448ms

ip_ti_add_dly__vb
V ms
0.0 2.94
6.0 2.94
8.0 2.94
10.0 1.58
12.0 1.15
14.0 0.73
16.0 0.55
25.0 0.55

Siemens DEKA FI114961 (107961) 630cc/min

39.15 PSI/270 kPa:

Minimum injection time: 0.981ms

ip_ti_add_dly__vb
V ms
0.0 2.60
6.0 2.60
8.0 1.45
10.0 0.94
12.0 0.64
14.0 0.43
16.0 0.26
25.0 0.26

Siemens DEKA FI114991 (110324) 875cc/min

39.15 PSI/270 kPa:

Minimum injection time: 0.202ms

ip_ti_add_dly__vb
V ms
0.0 2.811
6.0 2.811
8.0 1.777
10.0 1.288
12.0 1.017
14.0 0.801
16.0 0.639
25.0 0.639