wigenOut-S30 Posted October 5, 2016 Share Posted October 5, 2016 Hey HybridZ ! I am running a L28ET with JE pistons nismo HG T3/t4 50 trim turbo .. Mega squirt 1 extra rev 029V with Tuner Studio MS v3.0.10 I used to run Supra Mk3 turbo 440CC injectors (low emp) and switched over to these Denso 19550-1350 RX7 NA 460CC injectors (low emp).. I sent them to be flowed and cleaned. They all tested good and actually flowed 492 @2.25 bar fuel pressure.. However when crusing the AFR is hunting and never really stabilizes.. I set the required fuel for 460CC and I played with the Injector open time and the PWM under required fuel. With the Supra injectors I had the open time at 1.2ms same as the PWM. It does not seem to matter much if I change it to 1.0 , 1.2 or 1.3ms with these .. I have searched and searched and cannot find the dead time for these Denso Rx7 injectors.. They are Pintle style and I think the Supras were (disk with multiple holes ) has anyone had any experience with running these Rx7 injectors and tuning with them? at 25% throttle and at WOT they seem to have stable AFR right at what I am tuning for. Thanks for any help! Quote Link to comment Share on other sites More sharing options...
jacky4566 Posted October 5, 2016 Share Posted October 5, 2016 Are you using closed loop fueling for cruise? Sounds like your PID settings are wrong. Also you should be measuring dead time manually for every installation. It really helps trust me. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted October 5, 2016 Author Share Posted October 5, 2016 Thanks for your response!.. I have tried tuning non open loop and open loop.. both do the same hunting for AFR.. I looked at EGO control and I do not see anything that refers to PID. here is a screen shot as to what I see for EGO. Quote Link to comment Share on other sites More sharing options...
jacky4566 Posted October 5, 2016 Share Posted October 5, 2016 Ah i didn't know you are using MS1. Do you have a thread on MSextra yet? Those guys are the real guru. Post your MSQ and i can probably help a bit more Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted October 6, 2016 Author Share Posted October 6, 2016 I will post up on there .. I have never been on it before.. I cannot attach it.. Can I email it to you? PM me your email address if thats cool . Thanks! Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted October 6, 2016 Share Posted October 6, 2016 How many blocks are on the ms1 fuel map? Maybe there's too much variation from block to block? Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted October 6, 2016 Share Posted October 6, 2016 Or possible noise on the tps signal or map sensor. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted October 6, 2016 Author Share Posted October 6, 2016 (edited) Nothing has really changed with my setup though other then the injectors.. I have been running this setup fine for 6+ years with the supra 440cc mk3 injectors. MS1 has a 12 x12 table. Edited October 6, 2016 by wigenOut-S30 Quote Link to comment Share on other sites More sharing options...
Chickenman Posted October 7, 2016 Share Posted October 7, 2016 Did you actually measure the resistance of the injectors with an Ohm meter? That particular Denso injector came in both high and low impedance versions. Both with the same Part number. Don't go by colors ( Red or Purple ) as that can change from heat soak on used Injectors. http://www.robietherobot.com/storm/fuelinjectorguide.htm http://www.rotaryresurrection.com/rotary%20pages/injector%20folder/injector.html Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted October 7, 2016 Author Share Posted October 7, 2016 Yeah I did before sending them off to be cleaned and flowed.. They are all 2.5 to 3 Ohms. Quote Link to comment Share on other sites More sharing options...
jacky4566 Posted October 7, 2016 Share Posted October 7, 2016 I would still recommend testing and measuring your deadtime. When running small injectors its not a big deal but the closer you are to deadtime the larger the error. It's not a magic number you can just find online, it changes depending on your driver circuitry, wiring, grounding, other EMI devices on the 12v. Follow this guide: If you dont have graduated cylinders you can also weigh the fuel mass. That's what i did. 250g for each pulse width. Quote Link to comment Share on other sites More sharing options...
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