Fuel rail or lower intake differences

[Rubyz32]

I bought a 90 n/a. The P.O. Had a 94 engine put in it. It had a real bad stumble. I tested the injectors and 4 of them were way above 14 ohms. The P.O. In his attempts to fix the car replaced some of the injectors but was incredibly lazy in doing so and decided to break the connectors and just slide the wire onto the injector individually. I pulled the injectors yesterday and found 3 of the old stlye and 3 of the new style. I need to know if there is any way to tell if I need the p1 or the p2 injectors. Help I'm at a loss. I bought a new wiring specialties harness and I'm ready but injectors and and get her running, I just need to know which injectors to get. Sorry, that was redundant. Thanks guys.

[Ziggy1621]

Welcome to Nico! Make sure to post some pics of your Z!

My suggestion would definitely be to go with new style injectors. They are better for handling Ethanol fuel and will last you much longer!

[Foosblood24]

My suggestion would definitely be to go with new style injectors. They are better for handling Ethanol fuel and will last you much longer!

This^^^

While I'm still a noob at most of this, I was kinda forced to do research on injectors and learned a ton both here and other places online. The first thing to check is the fuel rail. If the P2's fit in the rail without adaptors on both sides then you should be totally fine. Check the P1's to see if they have adaptors. If they do, chuck em and get new P2's. With the new wiring harness, you should be good to go after that.

The curious question is why are there P1's at all? Unless the engine came from a TT or convertible, there shouldn't have been a reason to install them in the first place.

BUT...that does bring up curtain #2! IS the engine from a TT or a convertible? If so, it has the P1's as OEM and you'll either have to go with all P1's (I've been beaten over the head on the woes of this) OR you can do a complete fuel rail swap and go with the P2's (win)

[Rubyz32]

How do i tell if the p1s fit or if the p2s fit? The P2 came out with allot more resistance than the p1. Which leads me to believe I have a p2 rail???

[Ziggy1621]

You do not need to do a fuel rail swap, you can have an early style fuel rail with the new style injectors and an adapter kit

Here Is the kit http://www.conceptzperformance.com/Cart ... r_Type=300

Do,the new style injectors have the adapters as above? Post pics

[Foosblood24]

You do not need to do a fuel rail swap, you can have an early style fuel rail with the new style injectors and an adapter kit

Ah! Forgot about that! Once I found out my 93 NA already had P2's OEM, my brain abandoned ship on all the rest lol.

[Rubyz32]

No adapters whatsoever. I guess I'm not phrasing my question correctly. I apologize. Do the p1s fit in the p2 rail at all?

[Rubyz32]

My suggestion would definitely be to go with new style injectors. They are better for handling Ethanol fuel and will last you much longer!

This^^^

While I'm still a noob at most of this, I was kinda forced to do research on injectors and learned a ton both here and other places online. The first thing to check is the fuel rail. If the P2's fit in the rail without adaptors on both sides then you should be totally fine. Check the P1's to see if they have adaptors. If they do, chuck em and get new P2's. With the new wiring harness, you should be good to go after that.

The curious question is why are there P1's at all? Unless the engine came from a TT or convertible, there shouldn't have been a reason to install them in the first place.

BUT...that does bring up curtain #2! IS the engine from a TT or a convertible? If so, it has the P1's as OEM and you'll either have to go with all P1's (I've been beaten over the head on the woes of this) OR you can do a complete fuel rail swap and go with the P2's (win)

The p.o. Replaced some of the injectors in a feeble attempt to fix the issue, but when he did, he didn't do any research and just grabbed some injectors and threw them in. That's why I have no idea which inj/rail/manifold I have/need.

[Ziggy1621]

They would leak like crazy. Post up a pic with the old and new injectors you have as well as the empty spots on the rail

And I forgot, welcome to Nico

[Rubyz32]

They would leak like crazy. Post up a pic with the old and new injectors you have as well as the empty spots on the rail

Totally would if I could, but I have no idea how to post pics. Once I figure it out, I definitely will.

[Ziggy1621]

How to post pics how-to-post-pictures-using-photobucket-t521110.html

[Rubyz32]

How to post pics how-to-post-pictures-using-photobucket-t521110.html

You rock. Thanks.

[Ziggy1621]

[Rubyz32]

viewtopic.php?f=313&t=587832&p=6569726&e=6569726

[Rubyz32]

[Rubyz32]

[Rubyz32]

[Rubyz32]

im sorry about the 3 separate posts. I know cars, not computers. lol

from what im gathering, I have 3 p2 n/a injectors and 3 p2 turbo injectors which would explain why the car was stumling and has a bunch of fuel in the plenum. As far as I can tell, all I need is to install 6 new p2 n/a injectors (since these are all above 14 ohms) and I should be good to go. no adapter kit needed.

side note, while im in there, I want to replace all the fuel lines. is it 3/8?

Thanks for all the help

[Foosblood24]

from what im gathering, I have 3 p2 n/a injectors and 3 p2 turbo injectors which would explain why the car was stumling and has a bunch of fuel in the plenum. As far as I can tell, all I need is to install 6 new p2 n/a injectors (since these are all above 14 ohms)

Ok, that makes more sense. The TT P2's are at 370cc whereas the NA's are at 270cc so if you have an NA chances are you're gonna see better gas mileage as well as an easy fix for your setup. And the best part is you don't need any adaptors or anything! The new set of 270cc P2's will get you rockin!

[Rubyz32]

Talk about avoiding a headache. I was really worried I was going to have to replace and repair all kinds of stuff. Thanks for your help. You too ziggy.

I will post some pics of her once I get her put together.

[Ziggy1621]

The red ones are NA injectors. I do not see any TT injectors unless the red ones say Nismo, which would be the 740s.

That aside, those are all new style injectors, so you won't need the adapter kit!

[Rubyz32]

The red ones are NA injectors. I do not see any TT injectors unless the red ones say Nismo, which would be the 740s.

That aside, those are all new style injectors, so you won't need the adapter kit!

After looking at the wiki, I came to the conclusion that visible difference between the 270 and 370cc was where the screen is on the middle of the injector. Am I wrong? The point is mute now, but I'm still curious.

[Ziggy1621]

Not sure about the screen. And I was mistaken, I thought the 370s were all yellow. But it might be the old style. If you do indeed have mixed 270/370 then you would have had white smoke from unburnt fuel. The 370s would be dumping 50% more fuel than the 270