Pete Cotterill Posted January 20, 2010 Report Share Posted January 20, 2010 Hi, I have a set of Delphi 680cc injectors (Part No.17113814) to replace the stock injectors in my RB26 engine. These are low Z injectors running through the stock series resistors in my R33 GTR. I need to set up the deadband and master pulse width for these and can't find any information on them (Using a GTS/GTR plugin ecu). I was just wondering if anyone can help me? Thanks Pete Quote Link to comment Share on other sites More sharing options...
Pete Cotterill Posted January 21, 2010 Author Report Share Posted January 21, 2010 Anybody help??? Quote Link to comment Share on other sites More sharing options...
martin battye Posted January 21, 2010 Report Share Posted January 21, 2010 you need to set the master fuel to give good resolution in your fuelling table... set inj lag after your full tune by unplugging alternator fuse and increasing lag time while battery discharges to maintain stable afr.. you can put on all electrical items to help speed this up Quote Link to comment Share on other sites More sharing options...
Guest Dave Posted January 24, 2010 Report Share Posted January 24, 2010 Hi Pete and Martin never set the inj lag after tuning as this will throw the hole fuel map out the window injector deadtime needs to be setup before the main tune is done most times you only need to adjust the curve up or down I believe the delphi injectors you list are a rochester injector also marketed by msd I believe in the injector type selector there is a option for rochester 95lbs injectors this would be a good starting point to use Regards Dave Heerdegen [email protected] Quote Link to comment Share on other sites More sharing options...
Pete Cotterill Posted January 25, 2010 Author Report Share Posted January 25, 2010 Thanks Martin and Dave. I appreciate your help with this. Guys - The Master was set to 10mS for the 444cc injectors . I've installed the new injectors and ran at idle until the engine has reached running temp (Master now set at 7mS - This brings the AFR to the same running value as the smaller injectors (Turned off Closed loop lambda while setting this up). Also adjusted the deadtime at 14v from 0.920 to 0.90 I haven't made any changes to the fuel map at this point. I have a question though. will I need to change the injector timing? This is currently set at 390Deg BTDC (Cam timing remains unchanged). For now I've put the original injectors back in and chenged the settings back their previous values. Thanks Again Pete Quote Link to comment Share on other sites More sharing options...
martin battye Posted January 25, 2010 Report Share Posted January 25, 2010 ok.. corrected... re-itterate that... get a base idle af stable.. then cal the inj dead times... this works far more accurately than entering manufacturers data.. . Quote Link to comment Share on other sites More sharing options...
Pete Cotterill Posted January 31, 2010 Author Report Share Posted January 31, 2010 New injectors now installed and working fine. Used the Delphi 95lb dead times as a starting point and tuned from there. AFR now looking good (after tuning). Thanks to Dave and Martin for their help in pointing me in the right direction. Pete Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.