Fuel Injector Dwell Times

Posted on 11 December 2014 by admin

Injector Dwell TimeI recently installed and tuned an Adaptronic E420c on an 4AGE running ITB’s and after having tuned the car I found the idle to be a bit rough despite any changes to fuel or ignition tables and corrections, I could not really smooth it out and then I realized that I have never set the dwell time or dead time for my injectors!

What is “Dead time” and why do I need it?

Fuel injector dwell time or also called dead time and battery compensation is the time delay between the injector being powered and the injector actually opening. The dwell time (time it takes to open the injector) varies depending on the voltage being supplied, hence why some motors tend to idle rough when a thermo fan kicks in or idle is 100 or 150rpm lower than warm idle.

Getting the correct injector deadtime values set in your ECU is crucial for getting a stable idle and accurate air fuel ratios.
Eg: assuming your dwell time value of 0.50 at 14v is the correct and you also have your dwell time set to 0.50 at 13.0v the the motor will run slightly rough at 13v as a fuel injector takes longer to open when the voltage is lower, setting your dwell time correctly will ensure your motor runs smooth even when cold or under an increased electrical load.

Dwell time impact on tuning

Setting your dwell time correction values will help establish a more stable AFR, failure to correctly set injector dwell time values for each voltage will cause the engine to lean out whenever a drop in voltage occurs.

Dwell time \ Dead Time Chart

Note: Every manufacturer of fuel injectors have a different dwell time, SARD 650cc injectors will have a different dead time to Bosch 650cc, it is best to try and find the dwell time from your manufacturer for your model of injector, below is a list off fuel injectors and their dwell times, if you have any dwell times that I have no listed then please feel free to use the comment form at the bottom of the page so I can add it to the chart.

Injector Part Number Flow CC/min Flow LB/Hr Ohm 10v 11v 12v 13v 14v 15v 16V
Accel 578 55 3 1.24 1.03 0.87 0.73 0.63 0.53
Accel 872 83 3 1.46 1.20 1.00 0.85 0.73 0.62
Honda NSX 240 23 2 0.71 0.56 0.45 0.36 0.27 0.21
Honda Integra 290 28 12 1.28 1.07 0.86 0.70 0.57 0.46
Honda Integra 330 31 12 1.37 1.14 0.95 0.81 0.67 0.55
Audi S4/TT 340 32 14 1.12 0.91 0.75 0.62 0.52 0.42
Blitz 850 81 14 1.38 1.09 0.88 0.71 0.58 0.49
Bosch 1545 147 5 1.71 1.38 1.13 0.97 0.82 0.71
Deatschwerks 600 57 ? 2.00 1.80 1.60 1.50 1.30 1.20 1.20
Deatschwerks 800 47 ? 1.55 1.41 1.32 1.19 1.11 1.04 0.99
Denso 320 30.5 15 1.22 1.05 0.91 0.79 0.68 0.60
Denso 330 31.4 12 1.18 0.97 0.79 0.64 0.51 0.42
Denso 550 52 2 1.24 1.04 0.87 0.75 0.64 0.55
Denso 660 63 2 1.15 0.99 0.86 0.74 0.64 0.55
Denso 720 69 2 1.35 1.14 0.99 0.86 0.75 0.67
Dodge 4.7 273 26 12 1.75 1.44 1.22 1.03 0.89 0.73
Dodge SRT-4 (2003) 525 50 13 0.92 0.68 0.50 0.35 0.22 0.13
Dodge SRT-4 (2004+) 577 55 13 1.62 1.28 1.00 0.79 0.61 0.48
Dodge Viper (96-2002) 336 32 13 2.10 1.77 1.50 1.26 1.09 0.96
Edelbrock 630 60 12 0.76 0.55 0.39 0.25 0.15 0.04
Ford Motorsport 378 36 15 1.15 0.89 0.69 0.53 0.41 0.32
Ford Motorsport 441 42 14 1.14 0.92 0.75 0.64 0.56 0.49
Ford Motorsport 809 77 15 1.78 1.54 1.33 1.17 1.05 0.96
Ford Motorsport 1600 152 5 1.61 1.32 1.11 0.96 0.83 0.72
Ford Motorsport 1680 160 5 1.80 1.51 1.28 1.09 0.94 0.80
Ford mustang (84-95) 200 19 15 0.86 0.67 0.56 0.43 0.34 0.20
Ford Mustang Cobra 252 24 15 0.91 0.73 0.59 0.46 0.36 0.25
Mustang GT (96-03) 200 19 15 1.15 0.94 0.80 0.67 0.54 0.46
Mustang Turbo 315 30 15 0.88 0.68 0.56 0.43 0.33 0.23
Fuel Injector Clinic 650 62 2 1.13 0.96 0.78 0.66 0.54 0.45
Fuel Injector Clinic 850 81 2 1.02 0.87 0.74 0.62 0.51 0.43
Fuel Injector Clinic 950 90 2 1.30 1.05 0.88 0.75 0.65 0.57
Hahn Racecraft 625 60 3 1.19 0.97 0.79 0.69 0.57 0.50
HKS 402-RN011 480 46 2 1.16 ? 0.77 ? 0.48 ? 0.10
HKS 402-RN008 550 53 2 1.17 ? 0.83 ? 0.58 ? 0.40
HKS 402-RZ001 550 52 2 1.63 ? 1.27 ? 0.90 ? 0.54
HKS 402-RN010 600 57 2 0.85 ? 0.59 ? 0.40 ? 0.22
HKS 402-RZ002 680 65 2 1.70 ? 1.40 ? 1.11 ? 0.81
HKS 402-RN009 740 70 2 0.97 ? 0.63 ? 0.46 ? 0.35
HKS 402-RA002 1000 95 2 1.80 ? 1.40 ? 1.10 ? 1.00
HKS 1000 95 2 1.31 1.14 1.04 0.97 0.89 0.79
Holley 788 75 2 1.02 0.86 0.71 0.62 0.54 0.44
Honda Acura CL 240 23 2 0.73 0.64 0.52 0.43 0.36 0.25
Honda civic/crx/prelude/integra (86-91) 240 23 3 0.70 0.52 0.42 0.33 0.27 0.20
civic 92-00 (ex/si) 240 23 12 1.27 1.05 0.92 0.80 0.66 0.50
civic 92-00 (lx/dx/hx) 190 18 12 1.17 0.96 0.80 0.60 0.46 0.34
civic 01+ (EX) 240 23 11 1.04 0.82 0.64 0.53 0.43 0.36
civic 01+ (lx/dx/hx) 215 20 12 1.18 0.98 0.81 0.72 0.60 0.50
civic 03+ / CRV 02+ 290 28 12 1.35 1.15 0.98 0.84 0.71 0.61
Honda Civic 06+ Si 330 31 10 1.20 1.02 0.86 0.69 0.56 0.46
Honda Prelude 92-96 VTEC 330 31 2 0.72 0.56 0.45 0.35 0.27 0.24
Honda Prelude 97-02 290 28 12 1.24 1.02 0.85 0.74 0.63 0.54
Honda S2000 360 34 12 1.27 1.11 0.95 0.81 0.71 0.62
DSM 90-94 Blue 450 43 3 1.11 0.95 0.82 0.67 0.53 0.42
DSM 95-99 Black 450 43 3 1.00 0.81 0.67 0.55 0.45 0.32
Mitsubishi Lancer/eclipse (2.4L) 240 23 15 1.71 1.41 1.13 0.86 0.64 0.54
Mitsubishi Evo VIII 550 52 3 1.13 0.97 0.85 0.75 0.66 0.58
Mitsubishi Evo 9 MR 560 53 ?? 1.03 ?? 0.67 ?? 0.43 ??
Mitsubishi 3000GT (Stealth) 370 53 3 1.07 0.94 0.81 0.73 0.64 0.54
MSD 750 71 2 1.40 1.17 0.97 0.81 0.69 0.58
MSD 525 50 12 1.19 0.94 0.75 0.61 0.49 0.41
Nismo 740 70 11 1.15 0.94 0.79 0.66 0.55 0.44
Nissan 180 sx (88-93) / Skyline (86-88) 270 26 2 1.11 0.92 0.75 0.60 0.49 0.42
Nissan Pulsar Gti-R 444 42 2 1.14 0.96 0.83 0.71 0.60 0.54
Nissan Sentra/200sx/NX/G20 (2.0L ONLY) 259 25 11 0.90 0.75 0.64 0.56 0.47 0.42
Nissan Skyline GT-R 440 42 2 1.35 1.12 0.96 0.85 0.76 0.65
Nissan Skyline GTS-T 380 36 11 1.10 0.88 0.73 0.61 0.52 0.42
Nissan 300zx(95-96) / SR20DET 370 35 11 1.17 0.98 0.86 0.75 0.64 0.57
Nissan 240SX (89-90) 230 22 12 0.94 0.75 0.62 0.55 0.47 0.42
Nissan 240sx (91-98) / Altima (93-01) 250 24 11 1.00 0.83 0.69 0.57 0.47 0.40
Precision Turbo (Rochester) 525 50 12 1.33 1.05 0.84 0.66 0.54 0.45
Precision Turbo (Rochester) 680 65 2 1.56 1.36 1.22 1.13 1.05 0.96
Precision Turbo (Rochester) 1000 95 2 1.38 1.15 0.96 0.81 0.70 0.60
Precision Turbo (Rochester) 1200 114 ? 1.00 ? 0.80 ? 0.80 ? 0.74
Precision Turbo (Rochester) 1600 152 ? 1.00 ? 0.90 ? 0.84 ? 0.79
RC Engineering 240 23 16 1.31 1.10 0.97 0.77 0.62 0.46
RC Engineering 270 26 16 0.89 0.76 0.61 0.49 0.32 0.23
RC Engineering 310 30 16 1.14 0.89 0.72 0.55 0.43 0.33
RC Engineering 370 35 16 0.85 0.64 0.47 0.35 0.21 0.12
RC Engineering 440 42 13 1.27 1.08 0.91 0.74 0.63 0.53
RC Engineering 440 42 16 0.76 0.56 0.42 0.29 0.14 0.03
RC Engineering 550 52 3 0.92 0.81 0.68 0.59 0.51 0.40
RC Engineering 550 52 13 1.07 0.88 0.78 0.67 0.55 0.46
RC Engineering 650 62 12 1.08 0.86 0.69 0.54 0.41 0.31
RC Engineering 720 69 3 1.70 1.48 1.31 1.16 1.06 0.94
RC Engineering 750 71 3 0.88 0.66 0.48 0.32 0.18 0.05
RC Engineering 750 71 12 1.36 1.12 0.92 0.76 0.63 0.50
RC Engineering 900 86 3 1.70 1.48 1.31 1.16 1.06 0.94
RC Engineering 1000 95 3 1.17 0.95 0.80 0.67 0.56 0.46
RC Engineering 1200 114 3 2.55 2.28 2.00 1.79 1.62 1.46
RC Engineering 1600 152 3 1.80 1.46 1.23 1.05 0.92 0.81
Rochester 756 72 2 1.22 1.03 0.87 0.74 0.63 0.54
Rochester 1008 96 2 1.38 1.15 0.96 0.81 0.70 0.60
Sard 700 67 2 0.98 0.80 0.67 0.54 0.44 0.35
Sard 800 76 3 0.90 0.75 0.62 0.52 0.42 0.33
Siemens Deka 578 55 12 1.31 1.13 0.96 0.83 0.71 0.61
Siemens Deka 630 60 12 0.83 0.64 0.50 0.38 0.28 0.17
Siemens Deka 756 72 3 1.41 1.21 1.03 0.87 0.76 0.68
Siemens Deka 872 83 3 1.46 1.20 1.00 0.85 0.73 0.62
Subaru Impreza STI (top feed) 550 52 13 1.23 1.04 0.87 0.74 0.62 0.53
Subaru Impreza WRX 440 42 13 1.25 1.01 0.87 0.74 0.62 0.53
Toyota (00+ 1.5L) xB/xA/Prius/Echo 200 19 14 1.07 0.87 0.68 0.55 0.44 0.37
Toyota (04+ 2.4L) tC/Solaris/Camry/RAV4 330 31 12 1.18 0.97 0.79 0.64 0.51 0.42
Ultimate Racing 440 42 16 0.74 0.57 0.42 0.30 0.19 0.11
Vennom 880 84 12 1.27 1.00 0.77 0.64 0.51 0.45
VW Passat (98-99) Audi A4 (97-99) 220 21 12 0.82 0.62 0.46 0.34 0.24 0.19
VW Passat (2000) 240 23 12 1.05 0.84 0.69 0.60 0.52 0.43

 

 

2 Comments For This Post

  1. richard brautigan Says:
    October 6th, 2017 at 5:48 pm

    I’m assuming the dwell time chart is in milliseconds. Correct?

  2. admin Says:
    January 1st, 2019 at 11:52 pm

    Correct the chart is in milliseconds.

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