Injector Info - seen one seen them all ??
Posted: Thu Jul 10, 2008 9:00 pm
Howzit guys...
I would like to add info from all my research about injectors to the forum,Have you guys ever wondered why the CA18DET has a dropping resistor and why the CA18DE doesn't? Have you ever wondered why the Nissan Sunny GTi-R/Sr20VE 20v and sr20vet has a dropping resister and top-feed injectors along with with the RB26 and most other Sr's and RB's don't?
As I'm sure you guys know there are two types on injectors high impedance (saturated) and Low impedance (peak and hold)
Peak and Hold:
Peak/hold injectors are low impedance, usually in the 1-4 ohm range. When the ecu calls for fuel to be injected, it sends out voltage via the wire clips until a certain current level is reached (the peak part) (varies by injector size, company). For the duration of 1 pulse width, that current is slightly reduced and held (the hold part).
Saturated:
Saturated injectors are generally higher impedence than peak and hold, running in about the 10-15 ohms range. Unlike peak/hold, a saturated injector remains "on" for the entire pulse width.
Now Saturated are normally not found in sizes bigger then 550cc , Saturated injectors are normally found and used in lower model production motors and N/A engines they are cheaper to produce then low impedance injectors and more reliable now I hear you ask what the difference between the two well low impedance injector are quicker to open then saturated injector they are normally used in high performance N/A motors and performance driven Turbo models because they respond better and react quicker to sudden throttle and boost changes this is why main injector company's like RC produce low impedance performance injectors
Now you might be thinking is it really worth it to swap from saturated to peak and hold well yes! After reading a number of articals Im almost convinced the proof is in the pudding why would nissan just one manufacturer go through all the work to wire in dropping resistors and change internal injector resistance on already proven technology if they didn't see a need for it now this leads a bigger question why do some nissan turbo engine feature high impedance injector? there might be more to follow in other posts...
Thanks PFB
I would like to add info from all my research about injectors to the forum,Have you guys ever wondered why the CA18DET has a dropping resistor and why the CA18DE doesn't? Have you ever wondered why the Nissan Sunny GTi-R/Sr20VE 20v and sr20vet has a dropping resister and top-feed injectors along with with the RB26 and most other Sr's and RB's don't?
As I'm sure you guys know there are two types on injectors high impedance (saturated) and Low impedance (peak and hold)
Peak and Hold:
Peak/hold injectors are low impedance, usually in the 1-4 ohm range. When the ecu calls for fuel to be injected, it sends out voltage via the wire clips until a certain current level is reached (the peak part) (varies by injector size, company). For the duration of 1 pulse width, that current is slightly reduced and held (the hold part).
Saturated:
Saturated injectors are generally higher impedence than peak and hold, running in about the 10-15 ohms range. Unlike peak/hold, a saturated injector remains "on" for the entire pulse width.
Now Saturated are normally not found in sizes bigger then 550cc , Saturated injectors are normally found and used in lower model production motors and N/A engines they are cheaper to produce then low impedance injectors and more reliable now I hear you ask what the difference between the two well low impedance injector are quicker to open then saturated injector they are normally used in high performance N/A motors and performance driven Turbo models because they respond better and react quicker to sudden throttle and boost changes this is why main injector company's like RC produce low impedance performance injectors
Now you might be thinking is it really worth it to swap from saturated to peak and hold well yes! After reading a number of articals Im almost convinced the proof is in the pudding why would nissan just one manufacturer go through all the work to wire in dropping resistors and change internal injector resistance on already proven technology if they didn't see a need for it now this leads a bigger question why do some nissan turbo engine feature high impedance injector? there might be more to follow in other posts...
Thanks PFB
