z-ya Posted May 10, 2007 Share Posted May 10, 2007 Hear is a start on the injector opening times for various injectors. I also included two columns for MS PWM limit % and PMW time threshold. Thanks to Clifton for sending me the two RX7 injectors. I will continue to update this as I get more injectors Link to comment Share on other sites More sharing options...
clint78z Posted May 11, 2007 Share Posted May 11, 2007 Thanks so much, that is wonderful information that take so much guess work out. I am curious oof the testing methods used, did track the current on the scope ?? Was it fairly apparent when the numbers were reached, or was it subtle and you had to look for it closely?? Link to comment Share on other sites More sharing options...
datman Posted May 11, 2007 Share Posted May 11, 2007 Great work , any info on Delphi (17113814-72) 650cc injectors? Link to comment Share on other sites More sharing options...
z-ya Posted May 11, 2007 Author Share Posted May 11, 2007 Thanks so much, that is wonderful information that take so much guess work out. I am curious oof the testing methods used, did track the current on the scope ?? Was it fairly apparent when the numbers were reached, or was it subtle and you had to look for it closely?? Read these threads on how I do the measurements: http://forums.hybridz.org/showthread.php?t=121206 http://forums.hybridz.org/showthread.php?t=121361 Link to comment Share on other sites More sharing options...
z-ya Posted May 11, 2007 Author Share Posted May 11, 2007 Great work , any info on Delphi (17113814-72) 650cc injectors? Send me one and I'll measure it. PM me for my address. Link to comment Share on other sites More sharing options...
LineC Posted May 12, 2007 Share Posted May 12, 2007 I will be sending a CFI injector for you to test. The big blue 440cc. I think I have a grey one around too. Suppose to be a 503cc. Link to comment Share on other sites More sharing options...
proxlamus© Posted May 14, 2007 Share Posted May 14, 2007 wow sweet man!! you rock! Link to comment Share on other sites More sharing options...
z-ya Posted May 14, 2007 Author Share Posted May 14, 2007 I will be sending a CFI injector for you to test. The big blue 440cc. I think I have a grey one around too. Suppose to be a 503cc. I can't measure flow rate, only opening time. I can then optimize the PWM settings for that injector. I may build a flow rate test bench in the future, but I don't have one now. Link to comment Share on other sites More sharing options...
LineC Posted May 14, 2007 Share Posted May 14, 2007 Flow rate not a big deal for these. They are commonly used injectors. I think I have some flow rate charts for them laying around also. Be interested in seeing the opening times though. Link to comment Share on other sites More sharing options...
clint78z Posted May 22, 2007 Share Posted May 22, 2007 Does anybody know how to set PWM period on the MSII, I know it says keep it in the 10-25khz range. They really didn't say much more about it. Wondering if there is a proceedure for tuning this?? Link to comment Share on other sites More sharing options...
z-ya Posted May 22, 2007 Author Share Posted May 22, 2007 Tune it the same as the MS-I. Set your PWM current limit % and time threshold per this table. Set injector opening time to 1ms. Set battery compensation to default (0.2ms/V). Set the injector PWM period to 50us. This is equivalent to 20kHz in frequency. This is what MS-I uses. If you look at the measurement I made, the period of the ripple on the hold current is what the PWM period controls. If you look closely, you can fit about 10 of those cycles into one grid on the scope display. The timebase is 500us, so 500/10 = 50us. Link to comment Share on other sites More sharing options...
clint78z Posted May 23, 2007 Share Posted May 23, 2007 Great effort on your part Pete, keep up the good work!! I really like the background info on things, and how they work. It looks like the 50us give a nice clean swing back and forth. I think I am going to reread all the old posts, there is so much info !! Cheers, C Link to comment Share on other sites More sharing options...
hoohaa Posted June 28, 2007 Share Posted June 28, 2007 I see you've got the Bosch "402" CFI injector info. I am going to run Bosch "400" CFIs. Do you think they'd have the same opening times? They all read 2.6-2.7 ohms. Link to comment Share on other sites More sharing options...
z-ya Posted June 28, 2007 Author Share Posted June 28, 2007 I see you've got the Bosch "402" CFI injector info. I am going to run Bosch "400" CFIs. Do you think they'd have the same opening times? They all read 2.6-2.7 ohms. Yes, chances are they have very close to the same opening time. I can measure it if you want to send one to me. PM me if you are interested. Link to comment Share on other sites More sharing options...
WizardBlack Posted August 3, 2007 Share Posted August 3, 2007 Would you be interested in testing a Mitsubishi Evolution VIII injector? They are a readily available injector and flow 560 cc/min. Link to comment Share on other sites More sharing options...
z-ya Posted August 3, 2007 Author Share Posted August 3, 2007 PM me, and I will send you my address. Thanks Link to comment Share on other sites More sharing options...
zercs280zx Posted October 12, 2007 Share Posted October 12, 2007 Thanks for the great info. Quick question... I'm using the 280zxt injectors and they are listed with a 1.5 ms PWM threshold. The MS Tuning guide says to start with 1.0 ms and that 1.5 ms and above is risky for burning injectors out. Should I use 1.5 ms as the value in the Constants? I was assuming so, but the Megasquirt info is vague. Link to comment Share on other sites More sharing options...
z-ya Posted October 12, 2007 Author Share Posted October 12, 2007 I think the manual is talking about injector opening time, not PWM threshold. You should keep the injector opening time set to 1.0ms. Link to comment Share on other sites More sharing options...
zercs280zx Posted October 12, 2007 Share Posted October 12, 2007 I think the manual is talking about injector opening time, not PWM threshold. You should keep the injector opening time set to 1.0ms. Thanks for the response, z-ya. I'll stick with 1.0 ms as the opening time. I'm still confused though. The MS tuning manual does say to adjust the PWM Threshold Time, not the opening time: 1. Start with: PWM Time Threshold = 1.0 millisecond, and 4. Move on to adjusting the time threshold. Lower the time threshold by 0.1 milliseconds at a time until the idle quality deteriorates. 5. Then increase it 0.3 ms. 6. Now, repeat these steps (starting at #2). Adjust the duty cycle and time threshold alternately to get the optimum values for your set-up. You will converge on a set of numbers that work well for your set-up. Use PWM time threshold values greater than about 1.5 to 1.7 milliseconds only with great caution – it is possible to burn out your injectors! Should I set the PWM Threshold to 1.5 ms in the Constants? I've seen a few Contants pages (that have been posted with 280zxt injectors) that are set to 1.0 ms... so, I'm not exactly sure. Thanks for your help. zercs Link to comment Share on other sites More sharing options...
z-ya Posted October 12, 2007 Author Share Posted October 12, 2007 You can set it to 1.0ms if you like, and you will most likely be OK. I optimized the settings for the injectors in the spread sheet. The MS manual was probably written just using Megatune and a running engine, without a current probe and scope. Link to comment Share on other sites More sharing options...
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