Fuel injectors on my Z32 NA

[bravvo]

Ok, so I bough my 93 off a younger kid who clearly could not properly maintain the car. As I pull more apart I find more rigged up stuff. My problem & question this round is I bought new Fuel injector connectors due to the ones on there were mangled. After I got the new ones in the mail & removed the old clips from the injectors I realized that 3 have been replaced. From what I see the injectors for a 93 are different than 90-92. It looks like the injectors on the driver side are from 90-92 & the passenger side are the original. The motor is the 2nd to be in the car so who knows what has been done along the way. So my question is if I replace all the injectors at once, which I think I am going to do as long as I am pulling the plenum. What size injectors would be best? should I upgrade them? If I do change the size is there anything else that needs to be done in addition to compensate for the larger injectors?
How can I tell the year z from which my engine is from? is there a # or date on it I can refer to? From what I am seeing, It basically says that you shouldn't be able to use mixed (round plug & rectangular injectors) together... unless you were to use an adapter kit. Just want to be able to know which were the original injectors.

[Grant_z32]

ya have a N/A motor so i would say, and correct me if im wrong, look into getting the new stlye injectors from z1, i believe the are either 270cc or 370cc. its will run you a little over 600 but it will be worth it IMP.

[z32loverboy]

The only way I know how to tell the year of the engine is to find the engine VIN. It doesn't really matter which ones you have but the new style (93+ hatch, 94+ convertible) have to have an adapter that goes in the fuel rail for them to fit right, and different harness connectors to actually fit the injector connector. (THIS or something like it: http://www.z1motorsports.com/product_in ... ts_id=4558)

Since your car is naturally asperated you'll get little to no power, torque or economy gain in up grading your injectors. I'm boring my engine over, putting 1mm over sized valves in and have an exhaust and shouldn't ever max out the injectors. So unless you go with forced induction (turbo, supercharger, NO2, ect...) you don't need to upgrade size. The stock N/A size is 270CC. If you do upgrade injectors you MUST get your computer tuned. It won't know that you have bigger injectors unless you do. You'll either over fuel or run lean and there's not much you can do about that without a tune. Off the shelf tunes aren't super expensive, you just have to socket your ECU to accept the tuned chip and order the chip from a company (concept z, Z1motorsports, import parts pro) and tell them what upgrades you have and what not.

Hope that helps.

[a.p.barron]

Besides looking at the VIN, one thing that might help is looking at the balance tube. If you look at the passenger's side and it's missing the AIV nipple, it's most likely a 93+ engine. If it has 2 nipples and one of them is capped off (AIV), it's probably from a 90-92. Also, look at the plenum. If it has mounting brackets for throttle spring covers, it's most likely a 93+. Also, pay attention to the EGR ports on plenum. If the driver's side is angled in and the passenger side is not, it's a 93+.

If you have no idea what I'm talking about, check out this video that compares the plenums:

https://www.youtube.com/watch?v=d4avj-c8wZc

Hope that helps. :-)

[ThisIsSparTTa]

Since there are only Old>New adapters, I would imagine you have an old setup. I don't think there would be anything inherently wrong with mixing the 2. I don't know if there's any reason to go beyond 270CC with an NA anyways.

http://z32.wikispaces.com/Fuel+Injector

[bravvo]

Thanks guys, super helpful. I appreciate it greatly. Feel like a tard w some of my questions. New to the Z world but I will have this car for a long while and have big plans for a TT swap at some point.