???? About injector global

[95tsiawd0330]

Can someone answer this ?i have pte 880 injectors and in link under ecu config live at the fuel tab you can have ecmlink calculate your injector global settings.so I have 880 injectors and ecmlink says my global should be -48.8% but on ecmtuning.com in the wiki under baseinjectordata it say that 880 pte injectors global should be set at -45%.so what one is it -45% or -48.8%.also if iam at let's say 12.5 afr at wot at 3000 rpms if I want to get my afr to be around 11.5 afr I want to rise my ve cel for that rpm to get it from 12.5 afr to 11.5 afr??????i for got to say iam on speed density also

 

[boost97gst]

Whats probably confusing you is the ACTUAL flow of the injectors. See, i have pte 1000s for example. The actual flow is 940, so thats the number i plug in to calculate globals. Check actual flow, its prob around 830 - 840cc.

 

[steve]

Keep in mind that what a vender advertises the capacity of a product as doesn't mean that it's really so. For example that 1GB drive in your computer isn't really 1024^3 bytes (1073741824) but 10^9 (1000000000) or so bytes.

Back to your question many of the Rochester based injectors are advertised as being 880's but actually flow closer to 850 cc's. Part of tuning is using the feedback from your wideband to dial in the ECU setting so that when the ECU thinks it should be getting a 11.5 AFR based on the fuel map is really is hitting 11.5:1 and not 12.5:1.

 

[95tsiawd0330]

Whats probably confusing you is the ACTUAL flow of the injectors. See, i have pte 1000s for example. The actual flow is 940, so thats the number i plug in to calculate globals. Check actual flow, its prob around 830 - 840cc.

Thanks for the reply.yeah in wiki it says 880cc are 840cc.i was just getting lost seeing 2 different figures.so I typed in 840 in link and at idle I can hear a real light pop sound hear and there not consitantly and was thinking my global was not set right.what will cause this?

Keep in mind that what a vender advertises the capacity of a product as doesn't mean that it's really so. For example that 1GB drive in your computer isn't really 1024^3 bytes (1073741824) but 10^9 (1000000000) or so bytes.

Back to your question many of the Rochester based injectors are advertised as being 880's but actually flow closer to 850 cc's. Part of tuning is using the feedback from your wideband to dial in the ECU setting so that when the ECU thinks it should be getting a 11.5 AFR based on the fuel map is really is hitting 11.5:1 and not 12.5:1.

k thanks.so AFRest is not what my motor is seeing my wideband is what the motor is seeing in link right?let say I do a WOT pull and at wot I have my max octana set at 11.5 and my wb says iam at 12.1 I want to to raise my sd ve for that cel right?and is it normal to be in the 100's on my sd ve cels from 4500 rpm /16.5 on down on my sd ve chart?thanks again for the reply.

 

[steve]

so AFRest is not what my motor is seeing my wideband is what the motor is seeing in link right?let say I do a WOT pull and at wot I have my max octana set at 11.5 and my wb says iam at 12.1 I want to to raise my sd ve for that cel right?and is it normal to be in the 100's on my sd ve cels from 4500 rpm /16.5 on down on my sd ve chart?thanks again for the reply.

Sorry it's really hard to read your questions. regardless of what your posting with, please take the time to correct your spelling and punctuation so that your posts are understandable. It's not like answering your questions doesn't take any time from the rest of us so spend a little on yours. It's also a requirement for using the site.

AFRest I believe is what DSMLink thinks the AFR should be based on the airflow calculation and injector calculations. On a MAF car it's used to help dial in the MAF corrections assuming your injectors are set up correctly. I don't have any SD experience with DSMLink but it seems reasonable to use it to help set up the VE tables.

If you have your max load AFR throughout the RPM ranges set to 11.5:1 and your wideband is reading 12.1:1 to need to enrich those cells in to VE table. How you do that here I don't know since I haven't done it. I do know that the VE table isn't an absolute value so all of you values could be below 100% and as long as other factor are scaled correctly the end result would be right. I don't think you can go over 100% which is possible with the real VE on a turbo car when your in boost so I would expect if you have any cells at 100% you should think about rescaling the table to leave room for tuning as conditions change.