Injector Info - seen one seen them all ??

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » 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

Vlade · Post by **Vlade** » Fri Jul 11, 2008 8:28 am

man your one clever bunny...

Thanks always wondered about that...

Doctor G · Post by **Doctor G** » Fri Jul 11, 2008 9:27 am

a bit off topic but thought this was interesting.

Some guys use nissan injector s and modify the tips. This makes the 259cc DE injectors flow 550cc. The 370cc injectors can be modified to flow 870cc!!

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Fri Jul 11, 2008 9:55 am

bit off topic but thought this was interesting.

Some guys use nissan injector s and modify the tips. This makes the 259cc DE injectors flow 550cc. The 370cc injectors can be modified to flow 870cc!!

You can change the size of the pintel nozzle and pintel most Nissan injectors are pintel but it a very fine calculation to get the correct atomization so at the end of the day you will suffer huge idling issues because your fuel with not be atomizing correctly on the new modified injectors also I would like to see how they would balance a set of injectors out

Doctor G · Post by **Doctor G** » Fri Jul 11, 2008 10:25 am

Pinkfluffybunnys wrote:
bit off topic but thought this was interesting.

Some guys use nissan injector s and modify the tips. This makes the 259cc DE injectors flow 550cc. The 370cc injectors can be modified to flow 870cc!!
You can change the size of the pintel nozzle and pintel most Nissan injectors are pintel but it a very fine calculation to get the correct atomization so at the end of the day you will suffer huge idling issues because your fuel with not be atomizing correctly on the new modified injectors also I would like to see how they would balance a set of injectors out

yeah spray pattern was my only concern. I know on the superbikes the injectors have up to 12 holes per injector for better atomisation.

With the modified injectors they basically file away the tip so there are no holes left.

300sx · Post by **300sx** » Fri Jul 11, 2008 10:35 am

more injector info.. apparently redrilling injectors is not a good idea, never consistent..

see pics.. scary.. definitly changed my mind

http://www.filehost.co.za/showfile-67/d ... svsnew.pdf