what is the stock size of the injectors on the vg?

 

blue or black dot

 

pretty sure VG30E and ET injectors are 170cc..I can't find my old papers from RC, but I'm 99.9% sure

 

and et?? i thought those were 370cc.

 

nope..Z31 VG30ET and VG30E use the same cc injectors! Z32 injectors are 370cc

 

some guys on z31 say 259cc

 

you're right-->

http://www.zcar.com/forums/read.php?...90#reply_55192

strange...I was always under the impression they were less time to do more digging!

 

i was going to say, why the hell am i running rich then, lol. i can't seem to get my s-afc running right at the moment.

 

BINGO!!!-->

http://www.zcar.com/forums/read.php?...83#reply_54496

VG30ET = 259cc
VG30E= 178cc

that 259 will still suck probably once you get in the double digits of boost

 

that's when you go to the 1975 mercedes [correction] 450sel injectors. i can't remeber their flow rate but it's enough for 450 hp.

 

I was doing a search about injectors since my VG seems to be running rough and came upon this old thread. I looked up Mercedes 450 injectors on eBay and found this info:

Bosch hose end fuel injectors OHM's CC/Min Lb/hr
#0280 150 036 2.2 495 47

I wonder, would I have to fab new connectors to make these work with my stock VG engine? I'm thinking to upgrade in the future w/ turbo and/or VG33+ swap, so would this be advisable now or would be it decrease performance/MPG efficiency unless boosted?

Also, what is the best way to test current injectors?

 

I have 370cc and they flow no problem up to 15lbs of boost. Also they drop straight in plug and play. The stocks are 185cc according to nistune. That is on my 91 VG. Yes the turbo z31s are 259cc I happen to have spare set laying around if anyone needs.

 

Do you have a full set of six?

What condition are they in?

Do you need to upgrade anything else when you upgrade the injectors, like the fuel pump?

Does the a/f mixture run more rich with larger injectors or does the ECU regulate the fuel flow regardless or injector size? (Does having larger injectors just raise the ceiling of maximum flow/pressure and leave the low end stock?)

And, how much would you be asking for the Z31 injectors shipped to FL, 32615?

Thanks.

 

New connectors would of course be needed, but thats the least of your worries with these injectors. They are low impedance, and our injectors are high so your first hurdle would be to figure out how to control them, not to mention a custom fuel rail.
Short of having them flow tested, the best way to check injectors in your car is to make sure the coils are in spec (check the resistance)

 

Just want to clear a few things up in this post. 15psi is not a good indication of how well the injectors will flow. 15psi on one turbo may be 250hp, while a different turbo may make 400hp at 15psi.

The best way to determine what injectors will work best for you is to calculate your HP goals, and the HP capabilities of the injectors. 370cc injectors are good for around 325HP (stock FP and 80% duty cycle) while 259cc are good for about 225hp.

Lastly, 370cc injectors are far from "plug and play". There are 2 styles of 370cc from the z32, based on which style injectors your car came with you need to match your type with the 370s. You also need some type of fuel control to keep your engine from flooding.

The fuel pump would be a wise upgrade, especially if you current pump is old. Yes, your a/f would be very rich with either of these injectors, I doubt you could even get your engine to start. You must look into something like and SAFC, JWT ECU, Nistune.

 

talk to maxmaxima91 belive he has 370cc and belive he maxed them out at 18psi and he has a larger turbo than me.

 

What is that supposed to mean? Please elaborate on your point.

I happen to know Jeremy and Im familiar with his setup. He doesnt have 370cc injectors, and his turbo is a T4 making 400WHP at 18psi. You are making less than 300whp @15psi and he is making more than 100hp more on just 3 more PSI. This is exactly why you cant compare boost pressure between two turbos, its the amount of air it can flow. The flow directly relates to power, not the pressure.

 

where did I say I was making less than 300whp?

 

Well you said you are using 370cc injectors.....I think we already cover how much HP they are capable of flowing. Do you have secondary injectors? A dyno sheet? A point?

 

I believe the Mercedes injectors are top feed so you would have to actually change the fuel rail as well (if the top feed rail will even fit under the stock manifold, I'm not sure if it will). Other than that I'm pretty sure the connectors are the same. I believe they are mentioned at www.redz31.net in one of the fuel sections.

 

Well, truth is, I most likely will just replace a bad injector with a good stock one or another Nissan injector which is more or less plug and play. I would like to upgrade in the future if I happen to build the engine, so that is why I am doing my research now, but I don't even know if it is the injectors that are giving me the problem.

Basically, the engine is misfiring. I'm not sure what is causing it. I just gave it a tune up (NGK plugs, wires, cap, rotor, fuel filter, oil change...). So, I'm assuming it must be the injectors. It was running pretty well last week for a few days before it started running rough. Maybe it's the coil? Any ideas?

 

compression check first.