Injector duty cycle?
Injector duty cycle? Is there any post already out there that could hint as to what size injectors are needed based on current injector duty cycle and desired dry shot size? Is there a formula?
I ask because I'm trying find out what size injectors I should go up to... N/A with PE disabled on an SD tune, my car was pushing 56%. I failed to check it with my MAF on an PE enabled, but with a 25 dry everything was relatively ok (no SES, but I forgot to save the log) and with a 50 dry my injectors came to 96%!
and then my car said P0140, P1133, and P1153 
I have a 2002 Formula, a GT2-3 cam, and CNCed heads. My shot comes through a 52 NX jet but is limited by the Maximizer, and it's anyone's guess as to what the bottle pressure was!
I ask because I'm trying find out what size injectors I should go up to... N/A with PE disabled on an SD tune, my car was pushing 56%. I failed to check it with my MAF on an PE enabled, but with a 25 dry everything was relatively ok (no SES, but I forgot to save the log) and with a 50 dry my injectors came to 96%!
and then my car said P0140, P1133, and P1153 I have a 2002 Formula, a GT2-3 cam, and CNCed heads. My shot comes through a 52 NX jet but is limited by the Maximizer, and it's anyone's guess as to what the bottle pressure was!
If you already have h/c go with 60lbers... you may squeak by on 42s, but the the 60s will let you go a little bigger on your dry shot (assuming you have upgraded your pump as well), they are relatively easy to tune, and they don't cost much more.
dont _ever_ disable your PE!
two tools i made, they'll answer your questions:
http://redhardsupra.blogspot.com/200...readsheet.html
http://redhardsupra.blogspot.com/200...se-widths.html
two tools i made, they'll answer your questions:
http://redhardsupra.blogspot.com/200...readsheet.html
http://redhardsupra.blogspot.com/200...se-widths.html
I run the 42's and have only hit 80% with a 235 shot, and numbers in my sig. If you go with the SVO 42's they are actually about 47 or 48'ers at our pressure. Some of the others are 42lb'ers at our pressure. I don't know but seems something isn't right 56% DC n/a and 96% with a 50 dry hit. what was your a/f with the 50 shot, you may be too close and getting to good of a reading?
Robert
Edit: I do have an injector sizing formula if you like?
Robert
Edit: I do have an injector sizing formula if you like?
Originally Posted by Frost
If you already have h/c go with 60lbers... you may squeak by on 42s, but the the 60s will let you go a little bigger on your dry shot (assuming you have upgraded your pump as well), they are relatively easy to tune, and they don't cost much more.
Originally Posted by Matt@HSW
How big of a shot do you want to run? My suggestion would be a set of 42s, with them you'll have a bit of room to grow.
Matt
Matt
Originally Posted by RedHardSupra
dont _ever_ disable your PE!
Originally Posted by Robert56@NitrousDirect
I run the 42's and have only hit 80% with a 235 shot, and numbers in my sig. If you go with the SVO 42's they are actually about 47 or 48'ers at our pressure. Some of the others are 42lb'ers at our pressure. I don't know but seems something isn't right 56% DC n/a and 96% with a 50 dry hit. what was your a/f with the 50 shot, you may be too close and getting to good of a reading?
Robert
Edit: I do have an injector sizing formula if you like?
Robert
Edit: I do have an injector sizing formula if you like?
Maybe I'll do like Beer and get new injectors from HSW since I'm thinking of swining by there sometime anyway...
edit: I'm going to run and do a quick N/A log and 25 shot log now...
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Ok my injectors are maxed out N/A already 
96% w/o the bottle at 52 mph and 6000 RPM. Narrowbands are at 950-990 mV. Same deal for 2nd gear, 50 whatever till 110 mph. 
I don't see how! I don't have any extreme mods. So 42s you say? 55s and 65s are the same price, so unless it's bad, if I need bigger than 42s I think I'll just go to 65s.
96% w/o the bottle at 52 mph and 6000 RPM. Narrowbands are at 950-990 mV. Same deal for 2nd gear, 50 whatever till 110 mph. I don't see how! I don't have any extreme mods. So 42s you say? 55s and 65s are the same price, so unless it's bad, if I need bigger than 42s I think I'll just go to 65s. LS1 Tech Stories
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Stock LS1 PCM? If yes the 55s & 65s are low z, won't work with out a driver box. I would suggest the Siemens 60s if you don't want to go with a 42 lber. Just a FYI, we carry some Racetronix fuel injectors:
http://www.harrisspeedworks.com/shop/home.php?cat=331
Matt
http://www.harrisspeedworks.com/shop/home.php?cat=331
Matt
Originally Posted by gi8e7oi825
Ok my injectors are maxed out N/A already 96% w/o the bottle at 52 mph and 6000 RPM. Narrowbands are at 950-990 mV. Same deal for 2nd gear, 50 whatever till 110 mph. I don't see how! I don't have any extreme mods. So 42s you say? 55s and 65s are the same price, so unless it's bad, if I need bigger than 42s I think I'll just go to 65s.
96% w/o the bottle at 52 mph and 6000 RPM. Narrowbands are at 950-990 mV. Same deal for 2nd gear, 50 whatever till 110 mph. I don't see how! I don't have any extreme mods. So 42s you say? 55s and 65s are the same price, so unless it's bad, if I need bigger than 42s I think I'll just go to 65s.